cc/output/gl_renderer.cc

   1 // Copyright 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/gl_renderer.h"
   6
   7 #include <algorithm>
   8 #include <limits>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/logging.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/strings/string_split.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/stringprintf.h"
  18 #include "build/build_config.h"
  19 #include "base/trace_event/trace_event.h"
  20 #include "cc/base/math_util.h"
  21 #include "cc/output/compositor_frame.h"
  22 #include "cc/output/compositor_frame_metadata.h"
  23 #include "cc/output/context_provider.h"
  24 #include "cc/output/copy_output_request.h"
  25 #include "cc/output/dynamic_geometry_binding.h"
  26 #include "cc/output/gl_frame_data.h"
  27 #include "cc/output/layer_quad.h"
  28 #include "cc/output/output_surface.h"
  29 #include "cc/output/render_surface_filters.h"
  30 #include "cc/output/static_geometry_binding.h"
  31 #include "cc/output/texture_mailbox_deleter.h"
  32 #include "cc/quads/draw_polygon.h"
  33 #include "cc/quads/picture_draw_quad.h"
  34 #include "cc/quads/render_pass.h"
  35 #include "cc/quads/stream_video_draw_quad.h"
  36 #include "cc/quads/texture_draw_quad.h"
  37 #include "cc/raster/scoped_gpu_raster.h"
  38 #include "cc/resources/scoped_resource.h"
  39 #include "gpu/GLES2/gl2extchromium.h"
  40 #include "gpu/command_buffer/client/context_support.h"
  41 #include "gpu/command_buffer/client/gles2_interface.h"
  42 #include "gpu/command_buffer/common/gpu_memory_allocation.h"
  43 #include "third_party/skia/include/core/SkBitmap.h"
  44 #include "third_party/skia/include/core/SkColor.h"
  45 #include "third_party/skia/include/core/SkColorFilter.h"
  46 #include "third_party/skia/include/core/SkImage.h"
  47 #include "third_party/skia/include/core/SkSurface.h"
  48 #include "third_party/skia/include/gpu/GrContext.h"
  49 #include "third_party/skia/include/gpu/GrTexture.h"
  50 #include "third_party/skia/include/gpu/GrTextureProvider.h"
  51 #include "third_party/skia/include/gpu/SkGrTexturePixelRef.h"
  52 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
  53 #include "ui/gfx/geometry/quad_f.h"
  54 #include "ui/gfx/geometry/rect_conversions.h"
  55
  56 using gpu::gles2::GLES2Interface;
  57
  58 namespace cc {
  59 namespace {
  60
  61 bool NeedsIOSurfaceReadbackWorkaround() {
  62 #if defined(OS_MACOSX)
  63   // This isn't strictly required in DumpRenderTree-mode when Mesa is used,
  64   // but it doesn't seem to hurt.
  65   return true;
  66 #else
  67   return false;
  68 #endif
  69 }
  70
  71 Float4 UVTransform(const TextureDrawQuad* quad) {
  72   gfx::PointF uv0 = quad->uv_top_left;
  73   gfx::PointF uv1 = quad->uv_bottom_right;
  74   Float4 xform = {{uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()}};
  75   if (quad->y_flipped) {
  76     xform.data[1] = 1.0f - xform.data[1];
  77     xform.data[3] = -xform.data[3];
  78   }
  79   return xform;
  80 }
  81
  82 Float4 PremultipliedColor(SkColor color) {
  83   const float factor = 1.0f / 255.0f;
  84   const float alpha = SkColorGetA(color) * factor;
  85
  86   Float4 result = {
  87       {SkColorGetR(color) * factor * alpha, SkColorGetG(color) * factor * alpha,
  88        SkColorGetB(color) * factor * alpha, alpha}};
  89   return result;
  90 }
  91
  92 SamplerType SamplerTypeFromTextureTarget(GLenum target) {
  93   switch (target) {
  94     case GL_TEXTURE_2D:
  95       return SAMPLER_TYPE_2D;
  96     case GL_TEXTURE_RECTANGLE_ARB:
  97       return SAMPLER_TYPE_2D_RECT;
  98     case GL_TEXTURE_EXTERNAL_OES:
  99       return SAMPLER_TYPE_EXTERNAL_OES;
 100     default:
 101       NOTREACHED();
 102       return SAMPLER_TYPE_2D;
 103   }
 104 }
 105
 106 BlendMode BlendModeFromSkXfermode(SkXfermode::Mode mode) {
 107   switch (mode) {
 108     case SkXfermode::kSrcOver_Mode:
 109       return BLEND_MODE_NORMAL;
 110     case SkXfermode::kScreen_Mode:
 111       return BLEND_MODE_SCREEN;
 112     case SkXfermode::kOverlay_Mode:
 113       return BLEND_MODE_OVERLAY;
 114     case SkXfermode::kDarken_Mode:
 115       return BLEND_MODE_DARKEN;
 116     case SkXfermode::kLighten_Mode:
 117       return BLEND_MODE_LIGHTEN;
 118     case SkXfermode::kColorDodge_Mode:
 119       return BLEND_MODE_COLOR_DODGE;
 120     case SkXfermode::kColorBurn_Mode:
 121       return BLEND_MODE_COLOR_BURN;
 122     case SkXfermode::kHardLight_Mode:
 123       return BLEND_MODE_HARD_LIGHT;
 124     case SkXfermode::kSoftLight_Mode:
 125       return BLEND_MODE_SOFT_LIGHT;
 126     case SkXfermode::kDifference_Mode:
 127       return BLEND_MODE_DIFFERENCE;
 128     case SkXfermode::kExclusion_Mode:
 129       return BLEND_MODE_EXCLUSION;
 130     case SkXfermode::kMultiply_Mode:
 131       return BLEND_MODE_MULTIPLY;
 132     case SkXfermode::kHue_Mode:
 133       return BLEND_MODE_HUE;
 134     case SkXfermode::kSaturation_Mode:
 135       return BLEND_MODE_SATURATION;
 136     case SkXfermode::kColor_Mode:
 137       return BLEND_MODE_COLOR;
 138     case SkXfermode::kLuminosity_Mode:
 139       return BLEND_MODE_LUMINOSITY;
 140     default:
 141       NOTREACHED();
 142       return BLEND_MODE_NONE;
 143   }
 144 }
 145
 146 // Smallest unit that impact anti-aliasing output. We use this to
 147 // determine when anti-aliasing is unnecessary.
 148 const float kAntiAliasingEpsilon = 1.0f / 1024.0f;
 149
 150 // Block or crash if the number of pending sync queries reach this high as
 151 // something is seriously wrong on the service side if this happens.
 152 const size_t kMaxPendingSyncQueries = 16;
 153
 154 }  // anonymous namespace
 155
 156 static GLint GetActiveTextureUnit(GLES2Interface* gl) {
 157   GLint active_unit = 0;
 158   gl->GetIntegerv(GL_ACTIVE_TEXTURE, &active_unit);
 159   return active_unit;
 160 }
 161
 162 class GLRenderer::ScopedUseGrContext {
 163  public:
 164   static scoped_ptr<ScopedUseGrContext> Create(GLRenderer* renderer,
 165                                                DrawingFrame* frame) {
 166     // GrContext for filters is created lazily, and may fail if the context
 167     // is lost.
 168     // TODO(vmiura,bsalomon): crbug.com/487850 Ensure that
 169     // ContextProvider::GrContext() does not return NULL.
 170     if (renderer->output_surface_->context_provider()->GrContext())
 171       return make_scoped_ptr(new ScopedUseGrContext(renderer, frame));
 172     return nullptr;
 173   }
 174
 175   ~ScopedUseGrContext() {
 176     // Pass context control back to GLrenderer.
 177     scoped_gpu_raster_ = nullptr;
 178     renderer_->RestoreGLState();
 179     renderer_->RestoreFramebuffer(frame_);
 180   }
 181
 182   GrContext* context() const {
 183     return renderer_->output_surface_->context_provider()->GrContext();
 184   }
 185
 186  private:
 187   ScopedUseGrContext(GLRenderer* renderer, DrawingFrame* frame)
 188       : scoped_gpu_raster_(
 189             new ScopedGpuRaster(renderer->output_surface_->context_provider())),
 190         renderer_(renderer),
 191         frame_(frame) {
 192     // scoped_gpu_raster_ passes context control to Skia.
 193   }
 194
 195   scoped_ptr<ScopedGpuRaster> scoped_gpu_raster_;
 196   GLRenderer* renderer_;
 197   DrawingFrame* frame_;
 198
 199   DISALLOW_COPY_AND_ASSIGN(ScopedUseGrContext);
 200 };
 201
 202 struct GLRenderer::PendingAsyncReadPixels {
 203   PendingAsyncReadPixels() : buffer(0) {}
 204
 205   scoped_ptr<CopyOutputRequest> copy_request;
 206   base::CancelableClosure finished_read_pixels_callback;
 207   unsigned buffer;
 208
 209  private:
 210   DISALLOW_COPY_AND_ASSIGN(PendingAsyncReadPixels);
 211 };
 212
 213 class GLRenderer::SyncQuery {
 214  public:
 215   explicit SyncQuery(gpu::gles2::GLES2Interface* gl)
 216       : gl_(gl), query_id_(0u), is_pending_(false), weak_ptr_factory_(this) {
 217     gl_->GenQueriesEXT(1, &query_id_);
 218   }
 219   virtual ~SyncQuery() { gl_->DeleteQueriesEXT(1, &query_id_); }
 220
 221   scoped_refptr<ResourceProvider::Fence> Begin() {
 222     DCHECK(!IsPending());
 223     // Invalidate weak pointer held by old fence.
 224     weak_ptr_factory_.InvalidateWeakPtrs();
 225     // Note: In case the set of drawing commands issued before End() do not
 226     // depend on the query, defer BeginQueryEXT call until Set() is called and
 227     // query is required.
 228     return make_scoped_refptr<ResourceProvider::Fence>(
 229         new Fence(weak_ptr_factory_.GetWeakPtr()));
 230   }
 231
 232   void Set() {
 233     if (is_pending_)
 234       return;
 235
 236     // Note: BeginQueryEXT on GL_COMMANDS_COMPLETED_CHROMIUM is effectively a
 237     // noop relative to GL, so it doesn't matter where it happens but we still
 238     // make sure to issue this command when Set() is called (prior to issuing
 239     // any drawing commands that depend on query), in case some future extension
 240     // can take advantage of this.
 241     gl_->BeginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM, query_id_);
 242     is_pending_ = true;
 243   }
 244
 245   void End() {
 246     if (!is_pending_)
 247       return;
 248
 249     gl_->EndQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM);
 250   }
 251
 252   bool IsPending() {
 253     if (!is_pending_)
 254       return false;
 255
 256     unsigned result_available = 1;
 257     gl_->GetQueryObjectuivEXT(
 258         query_id_, GL_QUERY_RESULT_AVAILABLE_EXT, &result_available);
 259     is_pending_ = !result_available;
 260     return is_pending_;
 261   }
 262
 263   void Wait() {
 264     if (!is_pending_)
 265       return;
 266
 267     unsigned result = 0;
 268     gl_->GetQueryObjectuivEXT(query_id_, GL_QUERY_RESULT_EXT, &result);
 269     is_pending_ = false;
 270   }
 271
 272  private:
 273   class Fence : public ResourceProvider::Fence {
 274    public:
 275     explicit Fence(base::WeakPtr<GLRenderer::SyncQuery> query)
 276         : query_(query) {}
 277
 278     // Overridden from ResourceProvider::Fence:
 279     void Set() override {
 280       DCHECK(query_);
 281       query_->Set();
 282     }
 283     bool HasPassed() override { return !query_ || !query_->IsPending(); }
 284     void Wait() override {
 285       if (query_)
 286         query_->Wait();
 287     }
 288
 289    private:
 290     ~Fence() override {}
 291
 292     base::WeakPtr<SyncQuery> query_;
 293
 294     DISALLOW_COPY_AND_ASSIGN(Fence);
 295   };
 296
 297   gpu::gles2::GLES2Interface* gl_;
 298   unsigned query_id_;
 299   bool is_pending_;
 300   base::WeakPtrFactory<SyncQuery> weak_ptr_factory_;
 301
 302   DISALLOW_COPY_AND_ASSIGN(SyncQuery);
 303 };
 304
 305 scoped_ptr<GLRenderer> GLRenderer::Create(
 306     RendererClient* client,
 307     const RendererSettings* settings,
 308     OutputSurface* output_surface,
 309     ResourceProvider* resource_provider,
 310     TextureMailboxDeleter* texture_mailbox_deleter,
 311     int highp_threshold_min) {
 312   return make_scoped_ptr(new GLRenderer(client,
 313                                         settings,
 314                                         output_surface,
 315                                         resource_provider,
 316                                         texture_mailbox_deleter,
 317                                         highp_threshold_min));
 318 }
 319
 320 GLRenderer::GLRenderer(RendererClient* client,
 321                        const RendererSettings* settings,
 322                        OutputSurface* output_surface,
 323                        ResourceProvider* resource_provider,
 324                        TextureMailboxDeleter* texture_mailbox_deleter,
 325                        int highp_threshold_min)
 326     : DirectRenderer(client, settings, output_surface, resource_provider),
 327       offscreen_framebuffer_id_(0),
 328       shared_geometry_quad_(QuadVertexRect()),
 329       gl_(output_surface->context_provider()->ContextGL()),
 330       context_support_(output_surface->context_provider()->ContextSupport()),
 331       texture_mailbox_deleter_(texture_mailbox_deleter),
 332       is_backbuffer_discarded_(false),
 333       is_scissor_enabled_(false),
 334       scissor_rect_needs_reset_(true),
 335       stencil_shadow_(false),
 336       blend_shadow_(false),
 337       highp_threshold_min_(highp_threshold_min),
 338       highp_threshold_cache_(0),
 339       use_sync_query_(false),
 340       on_demand_tile_raster_resource_id_(0),
 341       bound_geometry_(NO_BINDING) {
 342   DCHECK(gl_);
 343   DCHECK(context_support_);
 344
 345   ContextProvider::Capabilities context_caps =
 346       output_surface_->context_provider()->ContextCapabilities();
 347
 348   capabilities_.using_partial_swap =
 349       settings_->partial_swap_enabled && context_caps.gpu.post_sub_buffer;
 350
 351   DCHECK(!context_caps.gpu.iosurface || context_caps.gpu.texture_rectangle);
 352
 353   capabilities_.using_egl_image = context_caps.gpu.egl_image_external;
 354
 355   capabilities_.max_texture_size = resource_provider_->max_texture_size();
 356   capabilities_.best_texture_format = resource_provider_->best_texture_format();
 357
 358   // The updater can access textures while the GLRenderer is using them.
 359   capabilities_.allow_partial_texture_updates = true;
 360
 361   capabilities_.using_image = context_caps.gpu.image;
 362
 363   capabilities_.using_discard_framebuffer =
 364       context_caps.gpu.discard_framebuffer;
 365
 366   capabilities_.allow_rasterize_on_demand = true;
 367   capabilities_.max_msaa_samples = context_caps.gpu.max_samples;
 368
 369   use_sync_query_ = context_caps.gpu.sync_query;
 370   use_blend_equation_advanced_ = context_caps.gpu.blend_equation_advanced;
 371   use_blend_equation_advanced_coherent_ =
 372       context_caps.gpu.blend_equation_advanced_coherent;
 373
 374   InitializeSharedObjects();
 375 }
 376
 377 GLRenderer::~GLRenderer() {
 378   while (!pending_async_read_pixels_.empty()) {
 379     PendingAsyncReadPixels* pending_read = pending_async_read_pixels_.back();
 380     pending_read->finished_read_pixels_callback.Cancel();
 381     pending_async_read_pixels_.pop_back();
 382   }
 383
 384   in_use_overlay_resources_.clear();
 385
 386   CleanupSharedObjects();
 387 }
 388
 389 const RendererCapabilitiesImpl& GLRenderer::Capabilities() const {
 390   return capabilities_;
 391 }
 392
 393 void GLRenderer::DidChangeVisibility() {
 394   EnforceMemoryPolicy();
 395
 396   context_support_->SetSurfaceVisible(visible());
 397
 398   // If we are not visible, we ask the context to aggressively free resources.
 399   context_support_->SetAggressivelyFreeResources(!visible());
 400 }
 401
 402 void GLRenderer::ReleaseRenderPassTextures() { render_pass_textures_.clear(); }
 403
 404 void GLRenderer::DiscardPixels() {
 405   if (!capabilities_.using_discard_framebuffer)
 406     return;
 407   bool using_default_framebuffer =
 408       !current_framebuffer_lock_ &&
 409       output_surface_->capabilities().uses_default_gl_framebuffer;
 410   GLenum attachments[] = {static_cast<GLenum>(
 411       using_default_framebuffer ? GL_COLOR_EXT : GL_COLOR_ATTACHMENT0_EXT)};
 412   gl_->DiscardFramebufferEXT(
 413       GL_FRAMEBUFFER, arraysize(attachments), attachments);
 414 }
 415
 416 void GLRenderer::PrepareSurfaceForPass(
 417     DrawingFrame* frame,
 418     SurfaceInitializationMode initialization_mode,
 419     const gfx::Rect& render_pass_scissor) {
 420   SetViewport();
 421
 422   switch (initialization_mode) {
 423     case SURFACE_INITIALIZATION_MODE_PRESERVE:
 424       EnsureScissorTestDisabled();
 425       return;
 426     case SURFACE_INITIALIZATION_MODE_FULL_SURFACE_CLEAR:
 427       EnsureScissorTestDisabled();
 428       DiscardPixels();
 429       ClearFramebuffer(frame);
 430       break;
 431     case SURFACE_INITIALIZATION_MODE_SCISSORED_CLEAR:
 432       SetScissorTestRect(render_pass_scissor);
 433       ClearFramebuffer(frame);
 434       break;
 435   }
 436 }
 437
 438 void GLRenderer::ClearFramebuffer(DrawingFrame* frame) {
 439   // On DEBUG builds, opaque render passes are cleared to blue to easily see
 440   // regions that were not drawn on the screen.
 441   if (frame->current_render_pass->has_transparent_background)
 442     gl_->ClearColor(0, 0, 0, 0);
 443   else
 444     gl_->ClearColor(0, 0, 1, 1);
 445
 446   bool always_clear = false;
 447 #ifndef NDEBUG
 448   always_clear = true;
 449 #endif
 450   if (always_clear || frame->current_render_pass->has_transparent_background) {
 451     GLbitfield clear_bits = GL_COLOR_BUFFER_BIT;
 452     if (always_clear)
 453       clear_bits |= GL_STENCIL_BUFFER_BIT;
 454     gl_->Clear(clear_bits);
 455   }
 456 }
 457
 458 void GLRenderer::BeginDrawingFrame(DrawingFrame* frame) {
 459   TRACE_EVENT0("cc", "GLRenderer::BeginDrawingFrame");
 460
 461   scoped_refptr<ResourceProvider::Fence> read_lock_fence;
 462   if (use_sync_query_) {
 463     // Block until oldest sync query has passed if the number of pending queries
 464     // ever reach kMaxPendingSyncQueries.
 465     if (pending_sync_queries_.size() >= kMaxPendingSyncQueries) {
 466       LOG(ERROR) << "Reached limit of pending sync queries.";
 467
 468       pending_sync_queries_.front()->Wait();
 469       DCHECK(!pending_sync_queries_.front()->IsPending());
 470     }
 471
 472     while (!pending_sync_queries_.empty()) {
 473       if (pending_sync_queries_.front()->IsPending())
 474         break;
 475
 476       available_sync_queries_.push_back(pending_sync_queries_.take_front());
 477     }
 478
 479     current_sync_query_ = available_sync_queries_.empty()
 480                               ? make_scoped_ptr(new SyncQuery(gl_))
 481                               : available_sync_queries_.take_front();
 482
 483     read_lock_fence = current_sync_query_->Begin();
 484   } else {
 485     read_lock_fence =
 486         make_scoped_refptr(new ResourceProvider::SynchronousFence(gl_));
 487   }
 488   resource_provider_->SetReadLockFence(read_lock_fence.get());
 489
 490   // Insert WaitSyncPointCHROMIUM on quad resources prior to drawing the frame,
 491   // so that drawing can proceed without GL context switching interruptions.
 492   ResourceProvider* resource_provider = resource_provider_;
 493   for (const auto& pass : *frame->render_passes_in_draw_order) {
 494     for (const auto& quad : pass->quad_list) {
 495       for (ResourceId resource_id : quad->resources)
 496         resource_provider->WaitSyncPointIfNeeded(resource_id);
 497     }
 498   }
 499
 500   // TODO(enne): Do we need to reinitialize all of this state per frame?
 501   ReinitializeGLState();
 502 }
 503
 504 void GLRenderer::DoNoOp() {
 505   gl_->BindFramebuffer(GL_FRAMEBUFFER, 0);
 506   gl_->Flush();
 507 }
 508
 509 void GLRenderer::DoDrawQuad(DrawingFrame* frame,
 510                             const DrawQuad* quad,
 511                             const gfx::QuadF* clip_region) {
 512   DCHECK(quad->rect.Contains(quad->visible_rect));
 513   if (quad->material != DrawQuad::TEXTURE_CONTENT) {
 514     FlushTextureQuadCache(SHARED_BINDING);
 515   }
 516
 517   switch (quad->material) {
 518     case DrawQuad::INVALID:
 519       NOTREACHED();
 520       break;
 521     case DrawQuad::CHECKERBOARD:
 522       DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad),
 523                            clip_region);
 524       break;
 525     case DrawQuad::DEBUG_BORDER:
 526       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 527       break;
 528     case DrawQuad::IO_SURFACE_CONTENT:
 529       DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad),
 530                         clip_region);
 531       break;
 532     case DrawQuad::PICTURE_CONTENT:
 533       // PictureDrawQuad should only be used for resourceless software draws.
 534       NOTREACHED();
 535       break;
 536     case DrawQuad::RENDER_PASS:
 537       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad),
 538                          clip_region);
 539       break;
 540     case DrawQuad::SOLID_COLOR:
 541       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad),
 542                          clip_region);
 543       break;
 544     case DrawQuad::STREAM_VIDEO_CONTENT:
 545       DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad),
 546                           clip_region);
 547       break;
 548     case DrawQuad::SURFACE_CONTENT:
 549       // Surface content should be fully resolved to other quad types before
 550       // reaching a direct renderer.
 551       NOTREACHED();
 552       break;
 553     case DrawQuad::TEXTURE_CONTENT:
 554       EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad),
 555                          clip_region);
 556       break;
 557     case DrawQuad::TILED_CONTENT:
 558       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad), clip_region);
 559       break;
 560     case DrawQuad::YUV_VIDEO_CONTENT:
 561       DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad),
 562                        clip_region);
 563       break;
 564   }
 565 }
 566
 567 void GLRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
 568                                       const CheckerboardDrawQuad* quad,
 569                                       const gfx::QuadF* clip_region) {
 570   // TODO(enne) For now since checkerboards shouldn't be part of a 3D
 571   // context, clipping regions aren't supported so we skip drawing them
 572   // if this becomes the case.
 573   if (clip_region) {
 574     return;
 575   }
 576   SetBlendEnabled(quad->ShouldDrawWithBlending());
 577
 578   const TileCheckerboardProgram* program = GetTileCheckerboardProgram();
 579   DCHECK(program && (program->initialized() || IsContextLost()));
 580   SetUseProgram(program->program());
 581
 582   SkColor color = quad->color;
 583   gl_->Uniform4f(program->fragment_shader().color_location(),
 584                  SkColorGetR(color) * (1.0f / 255.0f),
 585                  SkColorGetG(color) * (1.0f / 255.0f),
 586                  SkColorGetB(color) * (1.0f / 255.0f), 1);
 587
 588   const int kCheckerboardWidth = 16;
 589   float frequency = 1.0f / kCheckerboardWidth;
 590
 591   gfx::Rect tile_rect = quad->rect;
 592   float tex_offset_x =
 593       static_cast<int>(tile_rect.x() / quad->scale) % kCheckerboardWidth;
 594   float tex_offset_y =
 595       static_cast<int>(tile_rect.y() / quad->scale) % kCheckerboardWidth;
 596   float tex_scale_x = tile_rect.width() / quad->scale;
 597   float tex_scale_y = tile_rect.height() / quad->scale;
 598   gl_->Uniform4f(program->fragment_shader().tex_transform_location(),
 599                  tex_offset_x, tex_offset_y, tex_scale_x, tex_scale_y);
 600
 601   gl_->Uniform1f(program->fragment_shader().frequency_location(), frequency);
 602
 603   SetShaderOpacity(quad->shared_quad_state->opacity,
 604                    program->fragment_shader().alpha_location());
 605   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
 606                    quad->rect, program->vertex_shader().matrix_location());
 607 }
 608
 609 // This function does not handle 3D sorting right now, since the debug border
 610 // quads are just drawn as their original quads and not in split pieces. This
 611 // results in some debug border quads drawing over foreground quads.
 612 void GLRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 613                                      const DebugBorderDrawQuad* quad) {
 614   SetBlendEnabled(quad->ShouldDrawWithBlending());
 615
 616   static float gl_matrix[16];
 617   const DebugBorderProgram* program = GetDebugBorderProgram();
 618   DCHECK(program && (program->initialized() || IsContextLost()));
 619   SetUseProgram(program->program());
 620
 621   // Use the full quad_rect for debug quads to not move the edges based on
 622   // partial swaps.
 623   gfx::Rect layer_rect = quad->rect;
 624   gfx::Transform render_matrix;
 625   QuadRectTransform(&render_matrix,
 626                     quad->shared_quad_state->quad_to_target_transform,
 627                     layer_rect);
 628   GLRenderer::ToGLMatrix(&gl_matrix[0],
 629                          frame->projection_matrix * render_matrix);
 630   gl_->UniformMatrix4fv(program->vertex_shader().matrix_location(), 1, false,
 631                         &gl_matrix[0]);
 632
 633   SkColor color = quad->color;
 634   float alpha = SkColorGetA(color) * (1.0f / 255.0f);
 635
 636   gl_->Uniform4f(program->fragment_shader().color_location(),
 637                  (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
 638                  (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
 639                  (SkColorGetB(color) * (1.0f / 255.0f)) * alpha, alpha);
 640
 641   gl_->LineWidth(quad->width);
 642
 643   // The indices for the line are stored in the same array as the triangle
 644   // indices.
 645   gl_->DrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, 0);
 646 }
 647
 648 static skia::RefPtr<SkImage> ApplyImageFilter(
 649     scoped_ptr<GLRenderer::ScopedUseGrContext> use_gr_context,
 650     ResourceProvider* resource_provider,
 651     const gfx::Rect& rect,
 652     const gfx::Vector2dF& scale,
 653     SkImageFilter* filter,
 654     ScopedResource* source_texture_resource) {
 655   if (!filter)
 656     return skia::RefPtr<SkImage>();
 657
 658   if (!use_gr_context)
 659     return skia::RefPtr<SkImage>();
 660
 661   ResourceProvider::ScopedReadLockGL lock(resource_provider,
 662                                           source_texture_resource->id());
 663
 664   // Wrap the source texture in a Ganesh platform texture.
 665   GrBackendTextureDesc backend_texture_description;
 666   backend_texture_description.fWidth = source_texture_resource->size().width();
 667   backend_texture_description.fHeight =
 668       source_texture_resource->size().height();
 669   backend_texture_description.fConfig = kSkia8888_GrPixelConfig;
 670   backend_texture_description.fTextureHandle = lock.texture_id();
 671   backend_texture_description.fOrigin = kBottomLeft_GrSurfaceOrigin;
 672   skia::RefPtr<GrTexture> texture = skia::AdoptRef(
 673       use_gr_context->context()->textureProvider()->wrapBackendTexture(
 674           backend_texture_description));
 675   if (!texture) {
 676     TRACE_EVENT_INSTANT0("cc",
 677                          "ApplyImageFilter wrap background texture failed",
 678                          TRACE_EVENT_SCOPE_THREAD);
 679     return skia::RefPtr<SkImage>();
 680   }
 681
 682   SkImageInfo src_info =
 683       SkImageInfo::MakeN32Premul(source_texture_resource->size().width(),
 684                                  source_texture_resource->size().height());
 685   // Place the platform texture inside an SkBitmap.
 686   SkBitmap source;
 687   source.setInfo(src_info);
 688   skia::RefPtr<SkGrPixelRef> pixel_ref =
 689       skia::AdoptRef(new SkGrPixelRef(src_info, texture.get()));
 690   source.setPixelRef(pixel_ref.get());
 691
 692   // Create surface to draw into.
 693   SkImageInfo dst_info =
 694       SkImageInfo::MakeN32Premul(source.width(), source.height());
 695   skia::RefPtr<SkSurface> surface = skia::AdoptRef(SkSurface::NewRenderTarget(
 696       use_gr_context->context(), SkSurface::kYes_Budgeted, dst_info, 0));
 697   if (!surface) {
 698     TRACE_EVENT_INSTANT0("cc", "ApplyImageFilter surface allocation failed",
 699                          TRACE_EVENT_SCOPE_THREAD);
 700     return skia::RefPtr<SkImage>();
 701   }
 702   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
 703
 704   // Draw the source bitmap through the filter to the canvas.
 705   SkPaint paint;
 706   paint.setImageFilter(filter);
 707   canvas->clear(SK_ColorTRANSPARENT);
 708
 709   // The origin of the filter is top-left and the origin of the source is
 710   // bottom-left, but the orientation is the same, so we must translate the
 711   // filter so that it renders at the bottom of the texture to avoid
 712   // misregistration.
 713   int y_translate = source.height() - rect.height() - rect.origin().y();
 714   canvas->translate(-rect.origin().x(), y_translate);
 715   canvas->scale(scale.x(), scale.y());
 716   canvas->drawSprite(source, 0, 0, &paint);
 717
 718   skia::RefPtr<SkImage> image = skia::AdoptRef(surface->newImageSnapshot());
 719   if (!image || !image->isTextureBacked()) {
 720     return skia::RefPtr<SkImage>();
 721   }
 722
 723   return image;
 724 }
 725
 726 bool GLRenderer::CanApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
 727   return use_blend_equation_advanced_ ||
 728          blend_mode == SkXfermode::kScreen_Mode ||
 729          blend_mode == SkXfermode::kSrcOver_Mode;
 730 }
 731
 732 void GLRenderer::ApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
 733   DCHECK(CanApplyBlendModeUsingBlendFunc(blend_mode));
 734
 735   // Any modes set here must be reset in RestoreBlendFuncToDefault
 736   if (use_blend_equation_advanced_) {
 737     GLenum equation = GL_FUNC_ADD;
 738
 739     switch (blend_mode) {
 740       case SkXfermode::kScreen_Mode:
 741         equation = GL_SCREEN_KHR;
 742         break;
 743       case SkXfermode::kOverlay_Mode:
 744         equation = GL_OVERLAY_KHR;
 745         break;
 746       case SkXfermode::kDarken_Mode:
 747         equation = GL_DARKEN_KHR;
 748         break;
 749       case SkXfermode::kLighten_Mode:
 750         equation = GL_LIGHTEN_KHR;
 751         break;
 752       case SkXfermode::kColorDodge_Mode:
 753         equation = GL_COLORDODGE_KHR;
 754         break;
 755       case SkXfermode::kColorBurn_Mode:
 756         equation = GL_COLORBURN_KHR;
 757         break;
 758       case SkXfermode::kHardLight_Mode:
 759         equation = GL_HARDLIGHT_KHR;
 760         break;
 761       case SkXfermode::kSoftLight_Mode:
 762         equation = GL_SOFTLIGHT_KHR;
 763         break;
 764       case SkXfermode::kDifference_Mode:
 765         equation = GL_DIFFERENCE_KHR;
 766         break;
 767       case SkXfermode::kExclusion_Mode:
 768         equation = GL_EXCLUSION_KHR;
 769         break;
 770       case SkXfermode::kMultiply_Mode:
 771         equation = GL_MULTIPLY_KHR;
 772         break;
 773       case SkXfermode::kHue_Mode:
 774         equation = GL_HSL_HUE_KHR;
 775         break;
 776       case SkXfermode::kSaturation_Mode:
 777         equation = GL_HSL_SATURATION_KHR;
 778         break;
 779       case SkXfermode::kColor_Mode:
 780         equation = GL_HSL_COLOR_KHR;
 781         break;
 782       case SkXfermode::kLuminosity_Mode:
 783         equation = GL_HSL_LUMINOSITY_KHR;
 784         break;
 785       default:
 786         return;
 787     }
 788
 789     gl_->BlendEquation(equation);
 790   } else {
 791     if (blend_mode == SkXfermode::kScreen_Mode) {
 792       gl_->BlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ONE);
 793     }
 794   }
 795 }
 796
 797 void GLRenderer::RestoreBlendFuncToDefault(SkXfermode::Mode blend_mode) {
 798   if (blend_mode == SkXfermode::kSrcOver_Mode)
 799     return;
 800
 801   if (use_blend_equation_advanced_) {
 802     gl_->BlendEquation(GL_FUNC_ADD);
 803   } else {
 804     gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 805   }
 806 }
 807
 808 bool GLRenderer::ShouldApplyBackgroundFilters(DrawingFrame* frame,
 809                                               const RenderPassDrawQuad* quad) {
 810   if (quad->background_filters.IsEmpty())
 811     return false;
 812
 813   // TODO(danakj): We only allow background filters on an opaque render surface
 814   // because other surfaces may contain translucent pixels, and the contents
 815   // behind those translucent pixels wouldn't have the filter applied.
 816   if (frame->current_render_pass->has_transparent_background)
 817     return false;
 818
 819   // TODO(ajuma): Add support for reference filters once
 820   // FilterOperations::GetOutsets supports reference filters.
 821   if (quad->background_filters.HasReferenceFilter())
 822     return false;
 823   return true;
 824 }
 825
 826 // This takes a gfx::Rect and a clip region quad in the same space,
 827 // and returns a quad with the same proportions in the space -0.5->0.5.
 828 bool GetScaledRegion(const gfx::Rect& rect,
 829                      const gfx::QuadF* clip,
 830                      gfx::QuadF* scaled_region) {
 831   if (!clip)
 832     return false;
 833
 834   gfx::PointF p1(((clip->p1().x() - rect.x()) / rect.width()) - 0.5f,
 835                  ((clip->p1().y() - rect.y()) / rect.height()) - 0.5f);
 836   gfx::PointF p2(((clip->p2().x() - rect.x()) / rect.width()) - 0.5f,
 837                  ((clip->p2().y() - rect.y()) / rect.height()) - 0.5f);
 838   gfx::PointF p3(((clip->p3().x() - rect.x()) / rect.width()) - 0.5f,
 839                  ((clip->p3().y() - rect.y()) / rect.height()) - 0.5f);
 840   gfx::PointF p4(((clip->p4().x() - rect.x()) / rect.width()) - 0.5f,
 841                  ((clip->p4().y() - rect.y()) / rect.height()) - 0.5f);
 842   *scaled_region = gfx::QuadF(p1, p2, p3, p4);
 843   return true;
 844 }
 845
 846 // This takes a gfx::Rect and a clip region quad in the same space,
 847 // and returns the proportional uv's in the space 0->1.
 848 bool GetScaledUVs(const gfx::Rect& rect, const gfx::QuadF* clip, float uvs[8]) {
 849   if (!clip)
 850     return false;
 851
 852   uvs[0] = ((clip->p1().x() - rect.x()) / rect.width());
 853   uvs[1] = ((clip->p1().y() - rect.y()) / rect.height());
 854   uvs[2] = ((clip->p2().x() - rect.x()) / rect.width());
 855   uvs[3] = ((clip->p2().y() - rect.y()) / rect.height());
 856   uvs[4] = ((clip->p3().x() - rect.x()) / rect.width());
 857   uvs[5] = ((clip->p3().y() - rect.y()) / rect.height());
 858   uvs[6] = ((clip->p4().x() - rect.x()) / rect.width());
 859   uvs[7] = ((clip->p4().y() - rect.y()) / rect.height());
 860   return true;
 861 }
 862
 863 gfx::Rect GLRenderer::GetBackdropBoundingBoxForRenderPassQuad(
 864     DrawingFrame* frame,
 865     const RenderPassDrawQuad* quad,
 866     const gfx::Transform& contents_device_transform,
 867     const gfx::QuadF* clip_region,
 868     bool use_aa) {
 869   gfx::QuadF scaled_region;
 870   if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
 871     scaled_region = SharedGeometryQuad().BoundingBox();
 872   }
 873
 874   gfx::Rect backdrop_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
 875       contents_device_transform, scaled_region.BoundingBox()));
 876
 877   if (ShouldApplyBackgroundFilters(frame, quad)) {
 878     int top, right, bottom, left;
 879     quad->background_filters.GetOutsets(&top, &right, &bottom, &left);
 880     backdrop_rect.Inset(-left, -top, -right, -bottom);
 881   }
 882
 883   if (!backdrop_rect.IsEmpty() && use_aa) {
 884     const int kOutsetForAntialiasing = 1;
 885     backdrop_rect.Inset(-kOutsetForAntialiasing, -kOutsetForAntialiasing);
 886   }
 887
 888   backdrop_rect.Intersect(MoveFromDrawToWindowSpace(
 889       frame, frame->current_render_pass->output_rect));
 890   return backdrop_rect;
 891 }
 892
 893 scoped_ptr<ScopedResource> GLRenderer::GetBackdropTexture(
 894     const gfx::Rect& bounding_rect) {
 895   scoped_ptr<ScopedResource> device_background_texture =
 896       ScopedResource::Create(resource_provider_);
 897   // CopyTexImage2D fails when called on a texture having immutable storage.
 898   device_background_texture->Allocate(
 899       bounding_rect.size(), ResourceProvider::TEXTURE_HINT_DEFAULT, RGBA_8888);
 900   {
 901     ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
 902                                              device_background_texture->id());
 903     GetFramebufferTexture(
 904         lock.texture_id(), device_background_texture->format(), bounding_rect);
 905   }
 906   return device_background_texture.Pass();
 907 }
 908
 909 skia::RefPtr<SkImage> GLRenderer::ApplyBackgroundFilters(
 910     DrawingFrame* frame,
 911     const RenderPassDrawQuad* quad,
 912     ScopedResource* background_texture) {
 913   DCHECK(ShouldApplyBackgroundFilters(frame, quad));
 914   skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 915       quad->background_filters, background_texture->size());
 916
 917   skia::RefPtr<SkImage> background_with_filters = ApplyImageFilter(
 918       ScopedUseGrContext::Create(this, frame), resource_provider_, quad->rect,
 919       quad->filters_scale, filter.get(), background_texture);
 920   return background_with_filters;
 921 }
 922
 923 void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
 924                                     const RenderPassDrawQuad* quad,
 925                                     const gfx::QuadF* clip_region) {
 926   ScopedResource* contents_texture =
 927       render_pass_textures_.get(quad->render_pass_id);
 928   DCHECK(contents_texture);
 929   DCHECK(contents_texture->id());
 930
 931   gfx::Transform quad_rect_matrix;
 932   QuadRectTransform(&quad_rect_matrix,
 933                     quad->shared_quad_state->quad_to_target_transform,
 934                     quad->rect);
 935   gfx::Transform contents_device_transform =
 936       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 937   contents_device_transform.FlattenTo2d();
 938
 939   // Can only draw surface if device matrix is invertible.
 940   if (!contents_device_transform.IsInvertible())
 941     return;
 942
 943   gfx::QuadF surface_quad = SharedGeometryQuad();
 944
 945   gfx::QuadF device_layer_quad;
 946   bool use_aa = false;
 947   if (settings_->allow_antialiasing) {
 948     bool clipped = false;
 949     device_layer_quad =
 950         MathUtil::MapQuad(contents_device_transform, surface_quad, &clipped);
 951     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped,
 952                                  settings_->force_antialiasing);
 953   }
 954
 955   float edge[24];
 956   const gfx::QuadF* aa_quad = use_aa ? &device_layer_quad : nullptr;
 957   SetupRenderPassQuadForClippingAndAntialiasing(contents_device_transform, quad,
 958                                                 aa_quad, clip_region,
 959                                                 &surface_quad, edge);
 960   SkXfermode::Mode blend_mode = quad->shared_quad_state->blend_mode;
 961   bool use_shaders_for_blending =
 962       !CanApplyBlendModeUsingBlendFunc(blend_mode) ||
 963       ShouldApplyBackgroundFilters(frame, quad) ||
 964       settings_->force_blending_with_shaders;
 965
 966   scoped_ptr<ScopedResource> background_texture;
 967   skia::RefPtr<SkImage> background_image;
 968   GLuint background_image_id = 0;
 969   gfx::Rect background_rect;
 970   if (use_shaders_for_blending) {
 971     // Compute a bounding box around the pixels that will be visible through
 972     // the quad.
 973     background_rect = GetBackdropBoundingBoxForRenderPassQuad(
 974         frame, quad, contents_device_transform, clip_region, use_aa);
 975
 976     if (!background_rect.IsEmpty()) {
 977       // The pixels from the filtered background should completely replace the
 978       // current pixel values.
 979       if (blend_enabled())
 980         SetBlendEnabled(false);
 981
 982       // Read the pixels in the bounding box into a buffer R.
 983       // This function allocates a texture, which should contribute to the
 984       // amount of memory used by render surfaces:
 985       // LayerTreeHost::CalculateMemoryForRenderSurfaces.
 986       background_texture = GetBackdropTexture(background_rect);
 987
 988       if (ShouldApplyBackgroundFilters(frame, quad) && background_texture) {
 989         // Apply the background filters to R, so that it is applied in the
 990         // pixels' coordinate space.
 991         background_image =
 992             ApplyBackgroundFilters(frame, quad, background_texture.get());
 993         if (background_image)
 994           background_image_id = background_image->getTextureHandle(true);
 995         DCHECK(background_image_id);
 996       }
 997     }
 998
 999     if (!background_texture) {
1000       // Something went wrong with reading the backdrop.
1001       DCHECK(!background_image_id);
1002       use_shaders_for_blending = false;
1003     } else if (background_image_id) {
1004       // Reset original background texture if there is not any mask
1005       if (!quad->mask_resource_id())
1006         background_texture.reset();
1007     } else if (CanApplyBlendModeUsingBlendFunc(blend_mode) &&
1008                ShouldApplyBackgroundFilters(frame, quad)) {
1009       // Something went wrong with applying background filters to the backdrop.
1010       use_shaders_for_blending = false;
1011       background_texture.reset();
1012     }
1013   }
1014   // Need original background texture for mask?
1015   bool mask_for_background =
1016       background_texture &&      // Have original background texture
1017       background_image_id &&     // Have filtered background texture
1018       quad->mask_resource_id();  // Have mask texture
1019   SetBlendEnabled(
1020       !use_shaders_for_blending &&
1021       (quad->ShouldDrawWithBlending() || !IsDefaultBlendMode(blend_mode)));
1022
1023   // TODO(senorblanco): Cache this value so that we don't have to do it for both
1024   // the surface and its replica.  Apply filters to the contents texture.
1025   skia::RefPtr<SkImage> filter_image;
1026   GLuint filter_image_id = 0;
1027   SkScalar color_matrix[20];
1028   bool use_color_matrix = false;
1029   if (!quad->filters.IsEmpty()) {
1030     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
1031         quad->filters, contents_texture->size());
1032     if (filter) {
1033       skia::RefPtr<SkColorFilter> cf;
1034
1035       {
1036         SkColorFilter* colorfilter_rawptr = NULL;
1037         filter->asColorFilter(&colorfilter_rawptr);
1038         cf = skia::AdoptRef(colorfilter_rawptr);
1039       }
1040
1041       if (cf && cf->asColorMatrix(color_matrix) && !filter->getInput(0)) {
1042         // We have a single color matrix as a filter; apply it locally
1043         // in the compositor.
1044         use_color_matrix = true;
1045       } else {
1046         filter_image = ApplyImageFilter(
1047             ScopedUseGrContext::Create(this, frame), resource_provider_,
1048             quad->rect, quad->filters_scale, filter.get(), contents_texture);
1049         if (filter_image) {
1050           filter_image_id = filter_image->getTextureHandle(true);
1051           DCHECK(filter_image_id);
1052         }
1053       }
1054     }
1055   }
1056
1057   scoped_ptr<ResourceProvider::ScopedSamplerGL> mask_resource_lock;
1058   unsigned mask_texture_id = 0;
1059   SamplerType mask_sampler = SAMPLER_TYPE_NA;
1060   if (quad->mask_resource_id()) {
1061     mask_resource_lock.reset(new ResourceProvider::ScopedSamplerGL(
1062         resource_provider_, quad->mask_resource_id(), GL_TEXTURE1, GL_LINEAR));
1063     mask_texture_id = mask_resource_lock->texture_id();
1064     mask_sampler = SamplerTypeFromTextureTarget(mask_resource_lock->target());
1065   }
1066
1067   scoped_ptr<ResourceProvider::ScopedSamplerGL> contents_resource_lock;
1068   if (filter_image_id) {
1069     DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
1070     gl_->BindTexture(GL_TEXTURE_2D, filter_image_id);
1071   } else {
1072     contents_resource_lock =
1073         make_scoped_ptr(new ResourceProvider::ScopedSamplerGL(
1074             resource_provider_, contents_texture->id(), GL_LINEAR));
1075     DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
1076               contents_resource_lock->target());
1077   }
1078
1079   if (!use_shaders_for_blending) {
1080     if (!use_blend_equation_advanced_coherent_ && use_blend_equation_advanced_)
1081       gl_->BlendBarrierKHR();
1082
1083     ApplyBlendModeUsingBlendFunc(blend_mode);
1084   }
1085
1086   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1087       gl_, &highp_threshold_cache_, highp_threshold_min_,
1088       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
1089
1090   ShaderLocations locations;
1091
1092   DCHECK_EQ(background_texture || background_image_id,
1093             use_shaders_for_blending);
1094   BlendMode shader_blend_mode = use_shaders_for_blending
1095                                     ? BlendModeFromSkXfermode(blend_mode)
1096                                     : BLEND_MODE_NONE;
1097
1098   if (use_aa && mask_texture_id && !use_color_matrix) {
1099     const RenderPassMaskProgramAA* program = GetRenderPassMaskProgramAA(
1100         tex_coord_precision, mask_sampler,
1101         shader_blend_mode, mask_for_background);
1102     SetUseProgram(program->program());
1103     program->vertex_shader().FillLocations(&locations);
1104     program->fragment_shader().FillLocations(&locations);
1105     gl_->Uniform1i(locations.sampler, 0);
1106   } else if (!use_aa && mask_texture_id && !use_color_matrix) {
1107     const RenderPassMaskProgram* program = GetRenderPassMaskProgram(
1108         tex_coord_precision, mask_sampler,
1109         shader_blend_mode, mask_for_background);
1110     SetUseProgram(program->program());
1111     program->vertex_shader().FillLocations(&locations);
1112     program->fragment_shader().FillLocations(&locations);
1113     gl_->Uniform1i(locations.sampler, 0);
1114   } else if (use_aa && !mask_texture_id && !use_color_matrix) {
1115     const RenderPassProgramAA* program =
1116         GetRenderPassProgramAA(tex_coord_precision, shader_blend_mode);
1117     SetUseProgram(program->program());
1118     program->vertex_shader().FillLocations(&locations);
1119     program->fragment_shader().FillLocations(&locations);
1120     gl_->Uniform1i(locations.sampler, 0);
1121   } else if (use_aa && mask_texture_id && use_color_matrix) {
1122     const RenderPassMaskColorMatrixProgramAA* program =
1123         GetRenderPassMaskColorMatrixProgramAA(
1124             tex_coord_precision, mask_sampler,
1125             shader_blend_mode, mask_for_background);
1126     SetUseProgram(program->program());
1127     program->vertex_shader().FillLocations(&locations);
1128     program->fragment_shader().FillLocations(&locations);
1129     gl_->Uniform1i(locations.sampler, 0);
1130   } else if (use_aa && !mask_texture_id && use_color_matrix) {
1131     const RenderPassColorMatrixProgramAA* program =
1132         GetRenderPassColorMatrixProgramAA(tex_coord_precision,
1133                                           shader_blend_mode);
1134     SetUseProgram(program->program());
1135     program->vertex_shader().FillLocations(&locations);
1136     program->fragment_shader().FillLocations(&locations);
1137     gl_->Uniform1i(locations.sampler, 0);
1138   } else if (!use_aa && mask_texture_id && use_color_matrix) {
1139     const RenderPassMaskColorMatrixProgram* program =
1140         GetRenderPassMaskColorMatrixProgram(
1141             tex_coord_precision, mask_sampler,
1142             shader_blend_mode, mask_for_background);
1143     SetUseProgram(program->program());
1144     program->vertex_shader().FillLocations(&locations);
1145     program->fragment_shader().FillLocations(&locations);
1146     gl_->Uniform1i(locations.sampler, 0);
1147   } else if (!use_aa && !mask_texture_id && use_color_matrix) {
1148     const RenderPassColorMatrixProgram* program =
1149         GetRenderPassColorMatrixProgram(tex_coord_precision, shader_blend_mode);
1150     SetUseProgram(program->program());
1151     program->vertex_shader().FillLocations(&locations);
1152     program->fragment_shader().FillLocations(&locations);
1153     gl_->Uniform1i(locations.sampler, 0);
1154   } else {
1155     const RenderPassProgram* program =
1156         GetRenderPassProgram(tex_coord_precision, shader_blend_mode);
1157     SetUseProgram(program->program());
1158     program->vertex_shader().FillLocations(&locations);
1159     program->fragment_shader().FillLocations(&locations);
1160     gl_->Uniform1i(locations.sampler, 0);
1161   }
1162   float tex_scale_x =
1163       quad->rect.width() / static_cast<float>(contents_texture->size().width());
1164   float tex_scale_y = quad->rect.height() /
1165                       static_cast<float>(contents_texture->size().height());
1166   DCHECK_LE(tex_scale_x, 1.0f);
1167   DCHECK_LE(tex_scale_y, 1.0f);
1168
1169   DCHECK(locations.tex_transform != -1 || IsContextLost());
1170   // Flip the content vertically in the shader, as the RenderPass input
1171   // texture is already oriented the same way as the framebuffer, but the
1172   // projection transform does a flip.
1173   gl_->Uniform4f(locations.tex_transform, 0.0f, tex_scale_y, tex_scale_x,
1174                  -tex_scale_y);
1175
1176   GLint last_texture_unit = 0;
1177   if (locations.mask_sampler != -1) {
1178     DCHECK_NE(locations.mask_tex_coord_scale, 1);
1179     DCHECK_NE(locations.mask_tex_coord_offset, 1);
1180     gl_->Uniform1i(locations.mask_sampler, 1);
1181
1182     gfx::RectF mask_uv_rect = quad->MaskUVRect();
1183     if (mask_sampler != SAMPLER_TYPE_2D) {
1184       mask_uv_rect.Scale(quad->mask_texture_size.width(),
1185                          quad->mask_texture_size.height());
1186     }
1187
1188     // Mask textures are oriented vertically flipped relative to the framebuffer
1189     // and the RenderPass contents texture, so we flip the tex coords from the
1190     // RenderPass texture to find the mask texture coords.
1191     gl_->Uniform2f(locations.mask_tex_coord_offset, mask_uv_rect.x(),
1192                    mask_uv_rect.bottom());
1193     gl_->Uniform2f(locations.mask_tex_coord_scale,
1194                    mask_uv_rect.width() / tex_scale_x,
1195                    -mask_uv_rect.height() / tex_scale_y);
1196
1197     last_texture_unit = 1;
1198   }
1199
1200   if (locations.edge != -1)
1201     gl_->Uniform3fv(locations.edge, 8, edge);
1202
1203   if (locations.viewport != -1) {
1204     float viewport[4] = {
1205         static_cast<float>(current_window_space_viewport_.x()),
1206         static_cast<float>(current_window_space_viewport_.y()),
1207         static_cast<float>(current_window_space_viewport_.width()),
1208         static_cast<float>(current_window_space_viewport_.height()),
1209     };
1210     gl_->Uniform4fv(locations.viewport, 1, viewport);
1211   }
1212
1213   if (locations.color_matrix != -1) {
1214     float matrix[16];
1215     for (int i = 0; i < 4; ++i) {
1216       for (int j = 0; j < 4; ++j)
1217         matrix[i * 4 + j] = SkScalarToFloat(color_matrix[j * 5 + i]);
1218     }
1219     gl_->UniformMatrix4fv(locations.color_matrix, 1, false, matrix);
1220   }
1221   static const float kScale = 1.0f / 255.0f;
1222   if (locations.color_offset != -1) {
1223     float offset[4];
1224     for (int i = 0; i < 4; ++i)
1225       offset[i] = SkScalarToFloat(color_matrix[i * 5 + 4]) * kScale;
1226
1227     gl_->Uniform4fv(locations.color_offset, 1, offset);
1228   }
1229
1230   scoped_ptr<ResourceProvider::ScopedSamplerGL> shader_background_sampler_lock;
1231   if (locations.backdrop != -1) {
1232     DCHECK(background_texture || background_image_id);
1233     DCHECK_NE(locations.backdrop, 0);
1234     DCHECK_NE(locations.backdrop_rect, 0);
1235
1236     gl_->Uniform1i(locations.backdrop, ++last_texture_unit);
1237
1238     gl_->Uniform4f(locations.backdrop_rect, background_rect.x(),
1239                    background_rect.y(), background_rect.width(),
1240                    background_rect.height());
1241
1242     if (background_image_id) {
1243       gl_->ActiveTexture(GL_TEXTURE0 + last_texture_unit);
1244       gl_->BindTexture(GL_TEXTURE_2D, background_image_id);
1245       gl_->ActiveTexture(GL_TEXTURE0);
1246       if (mask_for_background)
1247         gl_->Uniform1i(locations.original_backdrop, ++last_texture_unit);
1248     }
1249     if (background_texture) {
1250       shader_background_sampler_lock = make_scoped_ptr(
1251           new ResourceProvider::ScopedSamplerGL(resource_provider_,
1252                                                 background_texture->id(),
1253                                                 GL_TEXTURE0 + last_texture_unit,
1254                                                 GL_LINEAR));
1255       DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
1256                 shader_background_sampler_lock->target());
1257     }
1258   }
1259
1260   SetShaderOpacity(quad->shared_quad_state->opacity, locations.alpha);
1261   SetShaderQuadF(surface_quad, locations.quad);
1262   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1263                    quad->rect, locations.matrix);
1264
1265   // Flush the compositor context before the filter bitmap goes out of
1266   // scope, so the draw gets processed before the filter texture gets deleted.
1267   if (filter_image_id)
1268     gl_->Flush();
1269
1270   if (!use_shaders_for_blending)
1271     RestoreBlendFuncToDefault(blend_mode);
1272 }
1273
1274 struct SolidColorProgramUniforms {
1275   unsigned program;
1276   unsigned matrix_location;
1277   unsigned viewport_location;
1278   unsigned quad_location;
1279   unsigned edge_location;
1280   unsigned color_location;
1281 };
1282
1283 template <class T>
1284 static void SolidColorUniformLocation(T program,
1285                                       SolidColorProgramUniforms* uniforms) {
1286   uniforms->program = program->program();
1287   uniforms->matrix_location = program->vertex_shader().matrix_location();
1288   uniforms->viewport_location = program->vertex_shader().viewport_location();
1289   uniforms->quad_location = program->vertex_shader().quad_location();
1290   uniforms->edge_location = program->vertex_shader().edge_location();
1291   uniforms->color_location = program->fragment_shader().color_location();
1292 }
1293
1294 namespace {
1295 // These functions determine if a quad, clipped by a clip_region contains
1296 // the entire {top|bottom|left|right} edge.
1297 bool is_top(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1298   if (!quad->IsTopEdge())
1299     return false;
1300   if (!clip_region)
1301     return true;
1302
1303   return std::abs(clip_region->p1().y()) < kAntiAliasingEpsilon &&
1304          std::abs(clip_region->p2().y()) < kAntiAliasingEpsilon;
1305 }
1306
1307 bool is_bottom(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1308   if (!quad->IsBottomEdge())
1309     return false;
1310   if (!clip_region)
1311     return true;
1312
1313   return std::abs(clip_region->p3().y() -
1314                   quad->shared_quad_state->quad_layer_bounds.height()) <
1315              kAntiAliasingEpsilon &&
1316          std::abs(clip_region->p4().y() -
1317                   quad->shared_quad_state->quad_layer_bounds.height()) <
1318              kAntiAliasingEpsilon;
1319 }
1320
1321 bool is_left(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1322   if (!quad->IsLeftEdge())
1323     return false;
1324   if (!clip_region)
1325     return true;
1326
1327   return std::abs(clip_region->p1().x()) < kAntiAliasingEpsilon &&
1328          std::abs(clip_region->p4().x()) < kAntiAliasingEpsilon;
1329 }
1330
1331 bool is_right(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1332   if (!quad->IsRightEdge())
1333     return false;
1334   if (!clip_region)
1335     return true;
1336
1337   return std::abs(clip_region->p2().x() -
1338                   quad->shared_quad_state->quad_layer_bounds.width()) <
1339              kAntiAliasingEpsilon &&
1340          std::abs(clip_region->p3().x() -
1341                   quad->shared_quad_state->quad_layer_bounds.width()) <
1342              kAntiAliasingEpsilon;
1343 }
1344 }  // anonymous namespace
1345
1346 static gfx::QuadF GetDeviceQuadWithAntialiasingOnExteriorEdges(
1347     const LayerQuad& device_layer_edges,
1348     const gfx::Transform& device_transform,
1349     const gfx::QuadF& tile_quad,
1350     const gfx::QuadF* clip_region,
1351     const DrawQuad* quad) {
1352   gfx::RectF tile_rect = quad->visible_rect;
1353
1354   gfx::PointF bottom_right = tile_quad.p3();
1355   gfx::PointF bottom_left = tile_quad.p4();
1356   gfx::PointF top_left = tile_quad.p1();
1357   gfx::PointF top_right = tile_quad.p2();
1358   bool clipped = false;
1359
1360   // Map points to device space. We ignore |clipped|, since the result of
1361   // |MapPoint()| still produces a valid point to draw the quad with. When
1362   // clipped, the point will be outside of the viewport. See crbug.com/416367.
1363   bottom_right = MathUtil::MapPoint(device_transform, bottom_right, &clipped);
1364   bottom_left = MathUtil::MapPoint(device_transform, bottom_left, &clipped);
1365   top_left = MathUtil::MapPoint(device_transform, top_left, &clipped);
1366   top_right = MathUtil::MapPoint(device_transform, top_right, &clipped);
1367
1368   LayerQuad::Edge bottom_edge(bottom_right, bottom_left);
1369   LayerQuad::Edge left_edge(bottom_left, top_left);
1370   LayerQuad::Edge top_edge(top_left, top_right);
1371   LayerQuad::Edge right_edge(top_right, bottom_right);
1372
1373   // Only apply anti-aliasing to edges not clipped by culling or scissoring.
1374   // If an edge is degenerate we do not want to replace it with a "proper" edge
1375   // as that will cause the quad to possibly expand is strange ways.
1376   if (!top_edge.degenerate() && is_top(clip_region, quad) &&
1377       tile_rect.y() == quad->rect.y()) {
1378     top_edge = device_layer_edges.top();
1379   }
1380   if (!left_edge.degenerate() && is_left(clip_region, quad) &&
1381       tile_rect.x() == quad->rect.x()) {
1382     left_edge = device_layer_edges.left();
1383   }
1384   if (!right_edge.degenerate() && is_right(clip_region, quad) &&
1385       tile_rect.right() == quad->rect.right()) {
1386     right_edge = device_layer_edges.right();
1387   }
1388   if (!bottom_edge.degenerate() && is_bottom(clip_region, quad) &&
1389       tile_rect.bottom() == quad->rect.bottom()) {
1390     bottom_edge = device_layer_edges.bottom();
1391   }
1392
1393   float sign = tile_quad.IsCounterClockwise() ? -1 : 1;
1394   bottom_edge.scale(sign);
1395   left_edge.scale(sign);
1396   top_edge.scale(sign);
1397   right_edge.scale(sign);
1398
1399   // Create device space quad.
1400   return LayerQuad(left_edge, top_edge, right_edge, bottom_edge).ToQuadF();
1401 }
1402
1403 float GetTotalQuadError(const gfx::QuadF* clipped_quad,
1404                         const gfx::QuadF* ideal_rect) {
1405   return (clipped_quad->p1() - ideal_rect->p1()).LengthSquared() +
1406          (clipped_quad->p2() - ideal_rect->p2()).LengthSquared() +
1407          (clipped_quad->p3() - ideal_rect->p3()).LengthSquared() +
1408          (clipped_quad->p4() - ideal_rect->p4()).LengthSquared();
1409 }
1410
1411 // Attempt to rotate the clipped quad until it lines up the most
1412 // correctly. This is necessary because we check the edges of this
1413 // quad against the expected left/right/top/bottom for anti-aliasing.
1414 void AlignQuadToBoundingBox(gfx::QuadF* clipped_quad) {
1415   gfx::QuadF bounding_quad = gfx::QuadF(clipped_quad->BoundingBox());
1416   gfx::QuadF best_rotation = *clipped_quad;
1417   float least_error_amount = GetTotalQuadError(clipped_quad, &bounding_quad);
1418   for (size_t i = 1; i < 4; ++i) {
1419     clipped_quad->Realign(1);
1420     float new_error = GetTotalQuadError(clipped_quad, &bounding_quad);
1421     if (new_error < least_error_amount) {
1422       least_error_amount = new_error;
1423       best_rotation = *clipped_quad;
1424     }
1425   }
1426   *clipped_quad = best_rotation;
1427 }
1428
1429 // Map device space quad to local space. Device_transform has no 3d
1430 // component since it was flattened, so we don't need to project.  We should
1431 // have already checked that the transform was uninvertible before this call.
1432 gfx::QuadF MapQuadToLocalSpace(const gfx::Transform& device_transform,
1433                                const gfx::QuadF& device_quad) {
1434   gfx::Transform inverse_device_transform(gfx::Transform::kSkipInitialization);
1435   DCHECK(device_transform.IsInvertible());
1436   bool did_invert = device_transform.GetInverse(&inverse_device_transform);
1437   DCHECK(did_invert);
1438   bool clipped = false;
1439   gfx::QuadF local_quad =
1440       MathUtil::MapQuad(inverse_device_transform, device_quad, &clipped);
1441   // We should not DCHECK(!clipped) here, because anti-aliasing inflation may
1442   // cause device_quad to become clipped. To our knowledge this scenario does
1443   // not need to be handled differently than the unclipped case.
1444   return local_quad;
1445 }
1446
1447 void InflateAntiAliasingDistances(const gfx::QuadF& quad,
1448                                   LayerQuad* device_layer_edges,
1449                                   float edge[24]) {
1450   DCHECK(!quad.BoundingBox().IsEmpty());
1451   LayerQuad device_layer_bounds(gfx::QuadF(quad.BoundingBox()));
1452
1453   device_layer_edges->InflateAntiAliasingDistance();
1454   device_layer_edges->ToFloatArray(edge);
1455
1456   device_layer_bounds.InflateAntiAliasingDistance();
1457   device_layer_bounds.ToFloatArray(&edge[12]);
1458 }
1459
1460 // static
1461 bool GLRenderer::ShouldAntialiasQuad(const gfx::QuadF& device_layer_quad,
1462                                      bool clipped,
1463                                      bool force_aa) {
1464   // AAing clipped quads is not supported by the code yet.
1465   if (clipped)
1466     return false;
1467   if (device_layer_quad.BoundingBox().IsEmpty())
1468     return false;
1469   if (force_aa)
1470     return true;
1471
1472   bool is_axis_aligned_in_target = device_layer_quad.IsRectilinear();
1473   bool is_nearest_rect_within_epsilon =
1474       is_axis_aligned_in_target &&
1475       gfx::IsNearestRectWithinDistance(device_layer_quad.BoundingBox(),
1476                                        kAntiAliasingEpsilon);
1477   return !is_nearest_rect_within_epsilon;
1478 }
1479
1480 // static
1481 void GLRenderer::SetupQuadForClippingAndAntialiasing(
1482     const gfx::Transform& device_transform,
1483     const DrawQuad* quad,
1484     const gfx::QuadF* aa_quad,
1485     const gfx::QuadF* clip_region,
1486     gfx::QuadF* local_quad,
1487     float edge[24]) {
1488   gfx::QuadF rotated_clip;
1489   const gfx::QuadF* local_clip_region = clip_region;
1490   if (local_clip_region) {
1491     rotated_clip = *clip_region;
1492     AlignQuadToBoundingBox(&rotated_clip);
1493     local_clip_region = &rotated_clip;
1494   }
1495
1496   if (!aa_quad) {
1497     if (local_clip_region)
1498       *local_quad = *local_clip_region;
1499     return;
1500   }
1501
1502   LayerQuad device_layer_edges(*aa_quad);
1503   InflateAntiAliasingDistances(*aa_quad, &device_layer_edges, edge);
1504
1505   // If we have a clip region then we are split, and therefore
1506   // by necessity, at least one of our edges is not an external
1507   // one.
1508   bool is_full_rect = quad->visible_rect == quad->rect;
1509
1510   bool region_contains_all_outside_edges =
1511       is_full_rect &&
1512       (is_top(local_clip_region, quad) && is_left(local_clip_region, quad) &&
1513        is_bottom(local_clip_region, quad) && is_right(local_clip_region, quad));
1514
1515   bool use_aa_on_all_four_edges =
1516       !local_clip_region && region_contains_all_outside_edges;
1517
1518   gfx::QuadF device_quad;
1519   if (use_aa_on_all_four_edges) {
1520     device_quad = device_layer_edges.ToQuadF();
1521   } else {
1522     gfx::QuadF tile_quad(local_clip_region ? *local_clip_region
1523                                            : gfx::QuadF(quad->visible_rect));
1524     device_quad = GetDeviceQuadWithAntialiasingOnExteriorEdges(
1525         device_layer_edges, device_transform, tile_quad, local_clip_region,
1526         quad);
1527   }
1528
1529   *local_quad = MapQuadToLocalSpace(device_transform, device_quad);
1530 }
1531
1532 // static
1533 void GLRenderer::SetupRenderPassQuadForClippingAndAntialiasing(
1534     const gfx::Transform& device_transform,
1535     const RenderPassDrawQuad* quad,
1536     const gfx::QuadF* aa_quad,
1537     const gfx::QuadF* clip_region,
1538     gfx::QuadF* local_quad,
1539     float edge[24]) {
1540   gfx::QuadF rotated_clip;
1541   const gfx::QuadF* local_clip_region = clip_region;
1542   if (local_clip_region) {
1543     rotated_clip = *clip_region;
1544     AlignQuadToBoundingBox(&rotated_clip);
1545     local_clip_region = &rotated_clip;
1546   }
1547
1548   if (!aa_quad) {
1549     GetScaledRegion(quad->rect, local_clip_region, local_quad);
1550     return;
1551   }
1552
1553   LayerQuad device_layer_edges(*aa_quad);
1554   InflateAntiAliasingDistances(*aa_quad, &device_layer_edges, edge);
1555
1556   gfx::QuadF device_quad;
1557
1558   // Apply anti-aliasing only to the edges that are not being clipped
1559   if (local_clip_region) {
1560     gfx::QuadF tile_quad(quad->visible_rect);
1561     GetScaledRegion(quad->rect, local_clip_region, &tile_quad);
1562     device_quad = GetDeviceQuadWithAntialiasingOnExteriorEdges(
1563         device_layer_edges, device_transform, tile_quad, local_clip_region,
1564         quad);
1565   } else {
1566     device_quad = device_layer_edges.ToQuadF();
1567   }
1568
1569   *local_quad = MapQuadToLocalSpace(device_transform, device_quad);
1570 }
1571
1572 void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
1573                                     const SolidColorDrawQuad* quad,
1574                                     const gfx::QuadF* clip_region) {
1575   gfx::Rect tile_rect = quad->visible_rect;
1576
1577   SkColor color = quad->color;
1578   float opacity = quad->shared_quad_state->opacity;
1579   float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
1580
1581   // Early out if alpha is small enough that quad doesn't contribute to output.
1582   if (alpha < std::numeric_limits<float>::epsilon() &&
1583       quad->ShouldDrawWithBlending())
1584     return;
1585
1586   gfx::Transform device_transform =
1587       frame->window_matrix * frame->projection_matrix *
1588       quad->shared_quad_state->quad_to_target_transform;
1589   device_transform.FlattenTo2d();
1590   if (!device_transform.IsInvertible())
1591     return;
1592
1593   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
1594
1595   gfx::QuadF device_layer_quad;
1596   bool use_aa = false;
1597   bool allow_aa = settings_->allow_antialiasing &&
1598                   !quad->force_anti_aliasing_off && quad->IsEdge();
1599
1600   if (allow_aa) {
1601     bool clipped = false;
1602     bool force_aa = false;
1603     device_layer_quad = MathUtil::MapQuad(
1604         device_transform,
1605         gfx::QuadF(quad->shared_quad_state->visible_quad_layer_rect), &clipped);
1606     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped, force_aa);
1607   }
1608
1609   float edge[24];
1610   const gfx::QuadF* aa_quad = use_aa ? &device_layer_quad : nullptr;
1611   SetupQuadForClippingAndAntialiasing(device_transform, quad, aa_quad,
1612                                       clip_region, &local_quad, edge);
1613
1614   SolidColorProgramUniforms uniforms;
1615   if (use_aa) {
1616     SolidColorUniformLocation(GetSolidColorProgramAA(), &uniforms);
1617   } else {
1618     SolidColorUniformLocation(GetSolidColorProgram(), &uniforms);
1619   }
1620   SetUseProgram(uniforms.program);
1621
1622   gl_->Uniform4f(uniforms.color_location,
1623                  (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
1624                  (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
1625                  (SkColorGetB(color) * (1.0f / 255.0f)) * alpha, alpha);
1626   if (use_aa) {
1627     float viewport[4] = {
1628         static_cast<float>(current_window_space_viewport_.x()),
1629         static_cast<float>(current_window_space_viewport_.y()),
1630         static_cast<float>(current_window_space_viewport_.width()),
1631         static_cast<float>(current_window_space_viewport_.height()),
1632     };
1633     gl_->Uniform4fv(uniforms.viewport_location, 1, viewport);
1634     gl_->Uniform3fv(uniforms.edge_location, 8, edge);
1635   }
1636
1637   // Enable blending when the quad properties require it or if we decided
1638   // to use antialiasing.
1639   SetBlendEnabled(quad->ShouldDrawWithBlending() || use_aa);
1640
1641   // Normalize to tile_rect.
1642   local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
1643
1644   SetShaderQuadF(local_quad, uniforms.quad_location);
1645
1646   // The transform and vertex data are used to figure out the extents that the
1647   // un-antialiased quad should have and which vertex this is and the float
1648   // quad passed in via uniform is the actual geometry that gets used to draw
1649   // it. This is why this centered rect is used and not the original quad_rect.
1650   gfx::RectF centered_rect(
1651       gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
1652       tile_rect.size());
1653   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1654                    centered_rect, uniforms.matrix_location);
1655 }
1656
1657 struct TileProgramUniforms {
1658   unsigned program;
1659   unsigned matrix_location;
1660   unsigned viewport_location;
1661   unsigned quad_location;
1662   unsigned edge_location;
1663   unsigned vertex_tex_transform_location;
1664   unsigned sampler_location;
1665   unsigned fragment_tex_transform_location;
1666   unsigned alpha_location;
1667 };
1668
1669 template <class T>
1670 static void TileUniformLocation(T program, TileProgramUniforms* uniforms) {
1671   uniforms->program = program->program();
1672   uniforms->matrix_location = program->vertex_shader().matrix_location();
1673   uniforms->viewport_location = program->vertex_shader().viewport_location();
1674   uniforms->quad_location = program->vertex_shader().quad_location();
1675   uniforms->edge_location = program->vertex_shader().edge_location();
1676   uniforms->vertex_tex_transform_location =
1677       program->vertex_shader().vertex_tex_transform_location();
1678
1679   uniforms->sampler_location = program->fragment_shader().sampler_location();
1680   uniforms->alpha_location = program->fragment_shader().alpha_location();
1681   uniforms->fragment_tex_transform_location =
1682       program->fragment_shader().fragment_tex_transform_location();
1683 }
1684
1685 void GLRenderer::DrawTileQuad(const DrawingFrame* frame,
1686                               const TileDrawQuad* quad,
1687                               const gfx::QuadF* clip_region) {
1688   DrawContentQuad(frame, quad, quad->resource_id(), clip_region);
1689 }
1690
1691 void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
1692                                  const ContentDrawQuadBase* quad,
1693                                  ResourceId resource_id,
1694                                  const gfx::QuadF* clip_region) {
1695   gfx::Transform device_transform =
1696       frame->window_matrix * frame->projection_matrix *
1697       quad->shared_quad_state->quad_to_target_transform;
1698   device_transform.FlattenTo2d();
1699
1700   gfx::QuadF device_layer_quad;
1701   bool use_aa = false;
1702   bool allow_aa = settings_->allow_antialiasing && quad->IsEdge();
1703   if (allow_aa) {
1704     bool clipped = false;
1705     bool force_aa = false;
1706     device_layer_quad = MathUtil::MapQuad(
1707         device_transform,
1708         gfx::QuadF(quad->shared_quad_state->visible_quad_layer_rect), &clipped);
1709     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped, force_aa);
1710   }
1711
1712   // TODO(timav): simplify coordinate transformations in DrawContentQuadAA
1713   // similar to the way DrawContentQuadNoAA works and then consider
1714   // combining DrawContentQuadAA and DrawContentQuadNoAA into one method.
1715   if (use_aa)
1716     DrawContentQuadAA(frame, quad, resource_id, device_transform,
1717                       device_layer_quad, clip_region);
1718   else
1719     DrawContentQuadNoAA(frame, quad, resource_id, clip_region);
1720 }
1721
1722 void GLRenderer::DrawContentQuadAA(const DrawingFrame* frame,
1723                                    const ContentDrawQuadBase* quad,
1724                                    ResourceId resource_id,
1725                                    const gfx::Transform& device_transform,
1726                                    const gfx::QuadF& aa_quad,
1727                                    const gfx::QuadF* clip_region) {
1728   if (!device_transform.IsInvertible())
1729     return;
1730
1731   gfx::Rect tile_rect = quad->visible_rect;
1732
1733   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
1734       quad->tex_coord_rect, quad->rect, tile_rect);
1735   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
1736   float tex_to_geom_scale_y =
1737       quad->rect.height() / quad->tex_coord_rect.height();
1738
1739   gfx::RectF clamp_geom_rect(tile_rect);
1740   gfx::RectF clamp_tex_rect(tex_coord_rect);
1741   // Clamp texture coordinates to avoid sampling outside the layer
1742   // by deflating the tile region half a texel or half a texel
1743   // minus epsilon for one pixel layers. The resulting clamp region
1744   // is mapped to the unit square by the vertex shader and mapped
1745   // back to normalized texture coordinates by the fragment shader
1746   // after being clamped to 0-1 range.
1747   float tex_clamp_x =
1748       std::min(0.5f, 0.5f * clamp_tex_rect.width() - kAntiAliasingEpsilon);
1749   float tex_clamp_y =
1750       std::min(0.5f, 0.5f * clamp_tex_rect.height() - kAntiAliasingEpsilon);
1751   float geom_clamp_x =
1752       std::min(tex_clamp_x * tex_to_geom_scale_x,
1753                0.5f * clamp_geom_rect.width() - kAntiAliasingEpsilon);
1754   float geom_clamp_y =
1755       std::min(tex_clamp_y * tex_to_geom_scale_y,
1756                0.5f * clamp_geom_rect.height() - kAntiAliasingEpsilon);
1757   clamp_geom_rect.Inset(geom_clamp_x, geom_clamp_y, geom_clamp_x, geom_clamp_y);
1758   clamp_tex_rect.Inset(tex_clamp_x, tex_clamp_y, tex_clamp_x, tex_clamp_y);
1759
1760   // Map clamping rectangle to unit square.
1761   float vertex_tex_translate_x = -clamp_geom_rect.x() / clamp_geom_rect.width();
1762   float vertex_tex_translate_y =
1763       -clamp_geom_rect.y() / clamp_geom_rect.height();
1764   float vertex_tex_scale_x = tile_rect.width() / clamp_geom_rect.width();
1765   float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
1766
1767   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1768       gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
1769
1770   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
1771   float edge[24];
1772   SetupQuadForClippingAndAntialiasing(device_transform, quad, &aa_quad,
1773                                       clip_region, &local_quad, edge);
1774   ResourceProvider::ScopedSamplerGL quad_resource_lock(
1775       resource_provider_, resource_id,
1776       quad->nearest_neighbor ? GL_NEAREST : GL_LINEAR);
1777   SamplerType sampler =
1778       SamplerTypeFromTextureTarget(quad_resource_lock.target());
1779
1780   float fragment_tex_translate_x = clamp_tex_rect.x();
1781   float fragment_tex_translate_y = clamp_tex_rect.y();
1782   float fragment_tex_scale_x = clamp_tex_rect.width();
1783   float fragment_tex_scale_y = clamp_tex_rect.height();
1784
1785   // Map to normalized texture coordinates.
1786   if (sampler != SAMPLER_TYPE_2D_RECT) {
1787     gfx::Size texture_size = quad->texture_size;
1788     DCHECK(!texture_size.IsEmpty());
1789     fragment_tex_translate_x /= texture_size.width();
1790     fragment_tex_translate_y /= texture_size.height();
1791     fragment_tex_scale_x /= texture_size.width();
1792     fragment_tex_scale_y /= texture_size.height();
1793   }
1794
1795   TileProgramUniforms uniforms;
1796   if (quad->swizzle_contents) {
1797     TileUniformLocation(GetTileProgramSwizzleAA(tex_coord_precision, sampler),
1798                         &uniforms);
1799   } else {
1800     TileUniformLocation(GetTileProgramAA(tex_coord_precision, sampler),
1801                         &uniforms);
1802   }
1803
1804   SetUseProgram(uniforms.program);
1805   gl_->Uniform1i(uniforms.sampler_location, 0);
1806
1807   float viewport[4] = {
1808       static_cast<float>(current_window_space_viewport_.x()),
1809       static_cast<float>(current_window_space_viewport_.y()),
1810       static_cast<float>(current_window_space_viewport_.width()),
1811       static_cast<float>(current_window_space_viewport_.height()),
1812   };
1813   gl_->Uniform4fv(uniforms.viewport_location, 1, viewport);
1814   gl_->Uniform3fv(uniforms.edge_location, 8, edge);
1815
1816   gl_->Uniform4f(uniforms.vertex_tex_transform_location, vertex_tex_translate_x,
1817                  vertex_tex_translate_y, vertex_tex_scale_x,
1818                  vertex_tex_scale_y);
1819   gl_->Uniform4f(uniforms.fragment_tex_transform_location,
1820                  fragment_tex_translate_x, fragment_tex_translate_y,
1821                  fragment_tex_scale_x, fragment_tex_scale_y);
1822
1823   // Blending is required for antialiasing.
1824   SetBlendEnabled(true);
1825
1826   // Normalize to tile_rect.
1827   local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
1828
1829   SetShaderOpacity(quad->shared_quad_state->opacity, uniforms.alpha_location);
1830   SetShaderQuadF(local_quad, uniforms.quad_location);
1831
1832   // The transform and vertex data are used to figure out the extents that the
1833   // un-antialiased quad should have and which vertex this is and the float
1834   // quad passed in via uniform is the actual geometry that gets used to draw
1835   // it. This is why this centered rect is used and not the original quad_rect.
1836   gfx::RectF centered_rect(
1837       gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
1838       tile_rect.size());
1839   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1840                    centered_rect, uniforms.matrix_location);
1841 }
1842
1843 void GLRenderer::DrawContentQuadNoAA(const DrawingFrame* frame,
1844                                      const ContentDrawQuadBase* quad,
1845                                      ResourceId resource_id,
1846                                      const gfx::QuadF* clip_region) {
1847   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
1848       quad->tex_coord_rect, quad->rect, quad->visible_rect);
1849   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
1850   float tex_to_geom_scale_y =
1851       quad->rect.height() / quad->tex_coord_rect.height();
1852
1853   bool scaled = (tex_to_geom_scale_x != 1.f || tex_to_geom_scale_y != 1.f);
1854   GLenum filter = (scaled ||
1855                    !quad->shared_quad_state->quad_to_target_transform
1856                         .IsIdentityOrIntegerTranslation()) &&
1857                           !quad->nearest_neighbor
1858                       ? GL_LINEAR
1859                       : GL_NEAREST;
1860
1861   ResourceProvider::ScopedSamplerGL quad_resource_lock(
1862       resource_provider_, resource_id, filter);
1863   SamplerType sampler =
1864       SamplerTypeFromTextureTarget(quad_resource_lock.target());
1865
1866   float vertex_tex_translate_x = tex_coord_rect.x();
1867   float vertex_tex_translate_y = tex_coord_rect.y();
1868   float vertex_tex_scale_x = tex_coord_rect.width();
1869   float vertex_tex_scale_y = tex_coord_rect.height();
1870
1871   // Map to normalized texture coordinates.
1872   if (sampler != SAMPLER_TYPE_2D_RECT) {
1873     gfx::Size texture_size = quad->texture_size;
1874     DCHECK(!texture_size.IsEmpty());
1875     vertex_tex_translate_x /= texture_size.width();
1876     vertex_tex_translate_y /= texture_size.height();
1877     vertex_tex_scale_x /= texture_size.width();
1878     vertex_tex_scale_y /= texture_size.height();
1879   }
1880
1881   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1882       gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
1883
1884   TileProgramUniforms uniforms;
1885   if (quad->ShouldDrawWithBlending()) {
1886     if (quad->swizzle_contents) {
1887       TileUniformLocation(GetTileProgramSwizzle(tex_coord_precision, sampler),
1888                           &uniforms);
1889     } else {
1890       TileUniformLocation(GetTileProgram(tex_coord_precision, sampler),
1891                           &uniforms);
1892     }
1893   } else {
1894     if (quad->swizzle_contents) {
1895       TileUniformLocation(
1896           GetTileProgramSwizzleOpaque(tex_coord_precision, sampler), &uniforms);
1897     } else {
1898       TileUniformLocation(GetTileProgramOpaque(tex_coord_precision, sampler),
1899                           &uniforms);
1900     }
1901   }
1902
1903   SetUseProgram(uniforms.program);
1904   gl_->Uniform1i(uniforms.sampler_location, 0);
1905
1906   gl_->Uniform4f(uniforms.vertex_tex_transform_location, vertex_tex_translate_x,
1907                  vertex_tex_translate_y, vertex_tex_scale_x,
1908                  vertex_tex_scale_y);
1909
1910   SetBlendEnabled(quad->ShouldDrawWithBlending());
1911
1912   SetShaderOpacity(quad->shared_quad_state->opacity, uniforms.alpha_location);
1913
1914   // Pass quad coordinates to the uniform in the same order as GeometryBinding
1915   // does, then vertices will match the texture mapping in the vertex buffer.
1916   // The method SetShaderQuadF() changes the order of vertices and so it's
1917   // not used here.
1918   gfx::QuadF tile_rect(quad->visible_rect);
1919   float width = quad->visible_rect.width();
1920   float height = quad->visible_rect.height();
1921   gfx::PointF top_left = quad->visible_rect.origin();
1922   if (clip_region) {
1923     tile_rect = *clip_region;
1924     float gl_uv[8] = {
1925         (tile_rect.p4().x() - top_left.x()) / width,
1926         (tile_rect.p4().y() - top_left.y()) / height,
1927         (tile_rect.p1().x() - top_left.x()) / width,
1928         (tile_rect.p1().y() - top_left.y()) / height,
1929         (tile_rect.p2().x() - top_left.x()) / width,
1930         (tile_rect.p2().y() - top_left.y()) / height,
1931         (tile_rect.p3().x() - top_left.x()) / width,
1932         (tile_rect.p3().y() - top_left.y()) / height,
1933     };
1934     PrepareGeometry(CLIPPED_BINDING);
1935     clipped_geometry_->InitializeCustomQuadWithUVs(
1936         gfx::QuadF(quad->visible_rect), gl_uv);
1937   } else {
1938     PrepareGeometry(SHARED_BINDING);
1939   }
1940   float gl_quad[8] = {
1941       tile_rect.p4().x(),
1942       tile_rect.p4().y(),
1943       tile_rect.p1().x(),
1944       tile_rect.p1().y(),
1945       tile_rect.p2().x(),
1946       tile_rect.p2().y(),
1947       tile_rect.p3().x(),
1948       tile_rect.p3().y(),
1949   };
1950   gl_->Uniform2fv(uniforms.quad_location, 4, gl_quad);
1951
1952   static float gl_matrix[16];
1953   ToGLMatrix(&gl_matrix[0],
1954              frame->projection_matrix *
1955                  quad->shared_quad_state->quad_to_target_transform);
1956   gl_->UniformMatrix4fv(uniforms.matrix_location, 1, false, &gl_matrix[0]);
1957
1958   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
1959 }
1960
1961 void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
1962                                   const YUVVideoDrawQuad* quad,
1963                                   const gfx::QuadF* clip_region) {
1964   SetBlendEnabled(quad->ShouldDrawWithBlending());
1965
1966   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1967       gl_, &highp_threshold_cache_, highp_threshold_min_,
1968       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
1969
1970   bool use_alpha_plane = quad->a_plane_resource_id() != 0;
1971
1972   ResourceProvider::ScopedSamplerGL y_plane_lock(
1973       resource_provider_, quad->y_plane_resource_id(), GL_TEXTURE1, GL_LINEAR);
1974   ResourceProvider::ScopedSamplerGL u_plane_lock(
1975       resource_provider_, quad->u_plane_resource_id(), GL_TEXTURE2, GL_LINEAR);
1976   DCHECK_EQ(y_plane_lock.target(), u_plane_lock.target());
1977   ResourceProvider::ScopedSamplerGL v_plane_lock(
1978       resource_provider_, quad->v_plane_resource_id(), GL_TEXTURE3, GL_LINEAR);
1979   DCHECK_EQ(y_plane_lock.target(), v_plane_lock.target());
1980   scoped_ptr<ResourceProvider::ScopedSamplerGL> a_plane_lock;
1981   if (use_alpha_plane) {
1982     a_plane_lock.reset(new ResourceProvider::ScopedSamplerGL(
1983         resource_provider_, quad->a_plane_resource_id(), GL_TEXTURE4,
1984         GL_LINEAR));
1985     DCHECK_EQ(y_plane_lock.target(), a_plane_lock->target());
1986   }
1987
1988   // All planes must have the same sampler type.
1989   SamplerType sampler = SamplerTypeFromTextureTarget(y_plane_lock.target());
1990
1991   int matrix_location = -1;
1992   int ya_tex_scale_location = -1;
1993   int ya_tex_offset_location = -1;
1994   int uv_tex_scale_location = -1;
1995   int uv_tex_offset_location = -1;
1996   int ya_clamp_rect_location = -1;
1997   int uv_clamp_rect_location = -1;
1998   int y_texture_location = -1;
1999   int u_texture_location = -1;
2000   int v_texture_location = -1;
2001   int a_texture_location = -1;
2002   int yuv_matrix_location = -1;
2003   int yuv_adj_location = -1;
2004   int alpha_location = -1;
2005   if (use_alpha_plane) {
2006     const VideoYUVAProgram* program =
2007         GetVideoYUVAProgram(tex_coord_precision, sampler);
2008     DCHECK(program && (program->initialized() || IsContextLost()));
2009     SetUseProgram(program->program());
2010     matrix_location = program->vertex_shader().matrix_location();
2011     ya_tex_scale_location = program->vertex_shader().ya_tex_scale_location();
2012     ya_tex_offset_location = program->vertex_shader().ya_tex_offset_location();
2013     uv_tex_scale_location = program->vertex_shader().uv_tex_scale_location();
2014     uv_tex_offset_location = program->vertex_shader().uv_tex_offset_location();
2015     y_texture_location = program->fragment_shader().y_texture_location();
2016     u_texture_location = program->fragment_shader().u_texture_location();
2017     v_texture_location = program->fragment_shader().v_texture_location();
2018     a_texture_location = program->fragment_shader().a_texture_location();
2019     yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
2020     yuv_adj_location = program->fragment_shader().yuv_adj_location();
2021     ya_clamp_rect_location =
2022         program->fragment_shader().ya_clamp_rect_location();
2023     uv_clamp_rect_location =
2024         program->fragment_shader().uv_clamp_rect_location();
2025     alpha_location = program->fragment_shader().alpha_location();
2026   } else {
2027     const VideoYUVProgram* program =
2028         GetVideoYUVProgram(tex_coord_precision, sampler);
2029     DCHECK(program && (program->initialized() || IsContextLost()));
2030     SetUseProgram(program->program());
2031     matrix_location = program->vertex_shader().matrix_location();
2032     ya_tex_scale_location = program->vertex_shader().ya_tex_scale_location();
2033     ya_tex_offset_location = program->vertex_shader().ya_tex_offset_location();
2034     uv_tex_scale_location = program->vertex_shader().uv_tex_scale_location();
2035     uv_tex_offset_location = program->vertex_shader().uv_tex_offset_location();
2036     y_texture_location = program->fragment_shader().y_texture_location();
2037     u_texture_location = program->fragment_shader().u_texture_location();
2038     v_texture_location = program->fragment_shader().v_texture_location();
2039     yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
2040     yuv_adj_location = program->fragment_shader().yuv_adj_location();
2041     ya_clamp_rect_location =
2042         program->fragment_shader().ya_clamp_rect_location();
2043     uv_clamp_rect_location =
2044         program->fragment_shader().uv_clamp_rect_location();
2045     alpha_location = program->fragment_shader().alpha_location();
2046   }
2047
2048   gfx::SizeF ya_tex_scale(1.0f, 1.0f);
2049   gfx::SizeF uv_tex_scale(1.0f, 1.0f);
2050   if (sampler != SAMPLER_TYPE_2D_RECT) {
2051     DCHECK(!quad->ya_tex_size.IsEmpty());
2052     DCHECK(!quad->uv_tex_size.IsEmpty());
2053     ya_tex_scale = gfx::SizeF(1.0f / quad->ya_tex_size.width(),
2054                               1.0f / quad->ya_tex_size.height());
2055     uv_tex_scale = gfx::SizeF(1.0f / quad->uv_tex_size.width(),
2056                               1.0f / quad->uv_tex_size.height());
2057   }
2058
2059   float ya_vertex_tex_translate_x =
2060       quad->ya_tex_coord_rect.x() * ya_tex_scale.width();
2061   float ya_vertex_tex_translate_y =
2062       quad->ya_tex_coord_rect.y() * ya_tex_scale.height();
2063   float ya_vertex_tex_scale_x =
2064       quad->ya_tex_coord_rect.width() * ya_tex_scale.width();
2065   float ya_vertex_tex_scale_y =
2066       quad->ya_tex_coord_rect.height() * ya_tex_scale.height();
2067
2068   float uv_vertex_tex_translate_x =
2069       quad->uv_tex_coord_rect.x() * uv_tex_scale.width();
2070   float uv_vertex_tex_translate_y =
2071       quad->uv_tex_coord_rect.y() * uv_tex_scale.height();
2072   float uv_vertex_tex_scale_x =
2073       quad->uv_tex_coord_rect.width() * uv_tex_scale.width();
2074   float uv_vertex_tex_scale_y =
2075       quad->uv_tex_coord_rect.height() * uv_tex_scale.height();
2076
2077   gl_->Uniform2f(ya_tex_scale_location, ya_vertex_tex_scale_x,
2078                  ya_vertex_tex_scale_y);
2079   gl_->Uniform2f(ya_tex_offset_location, ya_vertex_tex_translate_x,
2080                  ya_vertex_tex_translate_y);
2081   gl_->Uniform2f(uv_tex_scale_location, uv_vertex_tex_scale_x,
2082                  uv_vertex_tex_scale_y);
2083   gl_->Uniform2f(uv_tex_offset_location, uv_vertex_tex_translate_x,
2084                  uv_vertex_tex_translate_y);
2085
2086   gfx::RectF ya_clamp_rect(ya_vertex_tex_translate_x, ya_vertex_tex_translate_y,
2087                            ya_vertex_tex_scale_x, ya_vertex_tex_scale_y);
2088   ya_clamp_rect.Inset(0.5f * ya_tex_scale.width(),
2089                       0.5f * ya_tex_scale.height());
2090   gfx::RectF uv_clamp_rect(uv_vertex_tex_translate_x, uv_vertex_tex_translate_y,
2091                            uv_vertex_tex_scale_x, uv_vertex_tex_scale_y);
2092   uv_clamp_rect.Inset(0.5f * uv_tex_scale.width(),
2093                       0.5f * uv_tex_scale.height());
2094   gl_->Uniform4f(ya_clamp_rect_location, ya_clamp_rect.x(), ya_clamp_rect.y(),
2095                  ya_clamp_rect.right(), ya_clamp_rect.bottom());
2096   gl_->Uniform4f(uv_clamp_rect_location, uv_clamp_rect.x(), uv_clamp_rect.y(),
2097                  uv_clamp_rect.right(), uv_clamp_rect.bottom());
2098
2099   gl_->Uniform1i(y_texture_location, 1);
2100   gl_->Uniform1i(u_texture_location, 2);
2101   gl_->Uniform1i(v_texture_location, 3);
2102   if (use_alpha_plane)
2103     gl_->Uniform1i(a_texture_location, 4);
2104
2105   // These values are magic numbers that are used in the transformation from YUV
2106   // to RGB color values.  They are taken from the following webpage:
2107   // http://www.fourcc.org/fccyvrgb.php
2108   float yuv_to_rgb_rec601[9] = {
2109       1.164f, 1.164f, 1.164f, 0.0f, -.391f, 2.018f, 1.596f, -.813f, 0.0f,
2110   };
2111   float yuv_to_rgb_jpeg[9] = {
2112       1.f, 1.f, 1.f, 0.0f, -.34414f, 1.772f, 1.402f, -.71414f, 0.0f,
2113   };
2114   float yuv_to_rgb_rec709[9] = {
2115       1.164f, 1.164f, 1.164f, 0.0f, -0.213f, 2.112f, 1.793f, -0.533f, 0.0f,
2116   };
2117
2118   // These values map to 16, 128, and 128 respectively, and are computed
2119   // as a fraction over 256 (e.g. 16 / 256 = 0.0625).
2120   // They are used in the YUV to RGBA conversion formula:
2121   //   Y - 16   : Gives 16 values of head and footroom for overshooting
2122   //   U - 128  : Turns unsigned U into signed U [-128,127]
2123   //   V - 128  : Turns unsigned V into signed V [-128,127]
2124   float yuv_adjust_constrained[3] = {
2125       -0.0625f, -0.5f, -0.5f,
2126   };
2127
2128   // Same as above, but without the head and footroom.
2129   float yuv_adjust_full[3] = {
2130       0.0f, -0.5f, -0.5f,
2131   };
2132
2133   float* yuv_to_rgb = NULL;
2134   float* yuv_adjust = NULL;
2135
2136   switch (quad->color_space) {
2137     case YUVVideoDrawQuad::REC_601:
2138       yuv_to_rgb = yuv_to_rgb_rec601;
2139       yuv_adjust = yuv_adjust_constrained;
2140       break;
2141     case YUVVideoDrawQuad::REC_709:
2142       yuv_to_rgb = yuv_to_rgb_rec709;
2143       yuv_adjust = yuv_adjust_constrained;
2144       break;
2145     case YUVVideoDrawQuad::JPEG:
2146       yuv_to_rgb = yuv_to_rgb_jpeg;
2147       yuv_adjust = yuv_adjust_full;
2148       break;
2149   }
2150
2151   // The transform and vertex data are used to figure out the extents that the
2152   // un-antialiased quad should have and which vertex this is and the float
2153   // quad passed in via uniform is the actual geometry that gets used to draw
2154   // it. This is why this centered rect is used and not the original quad_rect.
2155   gfx::RectF tile_rect = quad->rect;
2156   gl_->UniformMatrix3fv(yuv_matrix_location, 1, 0, yuv_to_rgb);
2157   gl_->Uniform3fv(yuv_adj_location, 1, yuv_adjust);
2158
2159   SetShaderOpacity(quad->shared_quad_state->opacity, alpha_location);
2160   if (!clip_region) {
2161     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2162                      tile_rect, matrix_location);
2163   } else {
2164     float uvs[8] = {0};
2165     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2166     gfx::QuadF region_quad = *clip_region;
2167     region_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
2168     region_quad -= gfx::Vector2dF(0.5f, 0.5f);
2169     DrawQuadGeometryClippedByQuadF(
2170         frame, quad->shared_quad_state->quad_to_target_transform, tile_rect,
2171         region_quad, matrix_location, uvs);
2172   }
2173 }
2174
2175 void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
2176                                      const StreamVideoDrawQuad* quad,
2177                                      const gfx::QuadF* clip_region) {
2178   SetBlendEnabled(quad->ShouldDrawWithBlending());
2179
2180   static float gl_matrix[16];
2181
2182   DCHECK(capabilities_.using_egl_image);
2183
2184   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2185       gl_, &highp_threshold_cache_, highp_threshold_min_,
2186       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2187
2188   const VideoStreamTextureProgram* program =
2189       GetVideoStreamTextureProgram(tex_coord_precision);
2190   SetUseProgram(program->program());
2191
2192   ToGLMatrix(&gl_matrix[0], quad->matrix);
2193   gl_->UniformMatrix4fv(program->vertex_shader().tex_matrix_location(), 1,
2194                         false, gl_matrix);
2195
2196   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2197                                           quad->resource_id());
2198   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2199   gl_->BindTexture(GL_TEXTURE_EXTERNAL_OES, lock.texture_id());
2200
2201   gl_->Uniform1i(program->fragment_shader().sampler_location(), 0);
2202
2203   SetShaderOpacity(quad->shared_quad_state->opacity,
2204                    program->fragment_shader().alpha_location());
2205   if (!clip_region) {
2206     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2207                      quad->rect, program->vertex_shader().matrix_location());
2208   } else {
2209     gfx::QuadF region_quad(*clip_region);
2210     region_quad.Scale(1.0f / quad->rect.width(), 1.0f / quad->rect.height());
2211     region_quad -= gfx::Vector2dF(0.5f, 0.5f);
2212     float uvs[8] = {0};
2213     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2214     DrawQuadGeometryClippedByQuadF(
2215         frame, quad->shared_quad_state->quad_to_target_transform, quad->rect,
2216         region_quad, program->vertex_shader().matrix_location(), uvs);
2217   }
2218 }
2219
2220 struct TextureProgramBinding {
2221   template <class Program>
2222   void Set(Program* program) {
2223     DCHECK(program);
2224     program_id = program->program();
2225     sampler_location = program->fragment_shader().sampler_location();
2226     matrix_location = program->vertex_shader().matrix_location();
2227     background_color_location =
2228         program->fragment_shader().background_color_location();
2229   }
2230   int program_id;
2231   int sampler_location;
2232   int matrix_location;
2233   int transform_location;
2234   int background_color_location;
2235 };
2236
2237 struct TexTransformTextureProgramBinding : TextureProgramBinding {
2238   template <class Program>
2239   void Set(Program* program) {
2240     TextureProgramBinding::Set(program);
2241     tex_transform_location = program->vertex_shader().tex_transform_location();
2242     vertex_opacity_location =
2243         program->vertex_shader().vertex_opacity_location();
2244   }
2245   int tex_transform_location;
2246   int vertex_opacity_location;
2247 };
2248
2249 void GLRenderer::FlushTextureQuadCache(BoundGeometry flush_binding) {
2250   // Check to see if we have anything to draw.
2251   if (draw_cache_.program_id == -1)
2252     return;
2253
2254   PrepareGeometry(flush_binding);
2255
2256   // Set the correct blending mode.
2257   SetBlendEnabled(draw_cache_.needs_blending);
2258
2259   // Bind the program to the GL state.
2260   SetUseProgram(draw_cache_.program_id);
2261
2262   // Bind the correct texture sampler location.
2263   gl_->Uniform1i(draw_cache_.sampler_location, 0);
2264
2265   // Assume the current active textures is 0.
2266   ResourceProvider::ScopedSamplerGL locked_quad(
2267       resource_provider_,
2268       draw_cache_.resource_id,
2269       draw_cache_.nearest_neighbor ? GL_NEAREST : GL_LINEAR);
2270   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2271   gl_->BindTexture(locked_quad.target(), locked_quad.texture_id());
2272
2273   static_assert(sizeof(Float4) == 4 * sizeof(float),
2274                 "Float4 struct should be densely packed");
2275   static_assert(sizeof(Float16) == 16 * sizeof(float),
2276                 "Float16 struct should be densely packed");
2277
2278   // Upload the tranforms for both points and uvs.
2279   gl_->UniformMatrix4fv(
2280       static_cast<int>(draw_cache_.matrix_location),
2281       static_cast<int>(draw_cache_.matrix_data.size()), false,
2282       reinterpret_cast<float*>(&draw_cache_.matrix_data.front()));
2283   gl_->Uniform4fv(static_cast<int>(draw_cache_.uv_xform_location),
2284                   static_cast<int>(draw_cache_.uv_xform_data.size()),
2285                   reinterpret_cast<float*>(&draw_cache_.uv_xform_data.front()));
2286
2287   if (draw_cache_.background_color != SK_ColorTRANSPARENT) {
2288     Float4 background_color = PremultipliedColor(draw_cache_.background_color);
2289     gl_->Uniform4fv(draw_cache_.background_color_location, 1,
2290                     background_color.data);
2291   }
2292
2293   gl_->Uniform1fv(
2294       static_cast<int>(draw_cache_.vertex_opacity_location),
2295       static_cast<int>(draw_cache_.vertex_opacity_data.size()),
2296       static_cast<float*>(&draw_cache_.vertex_opacity_data.front()));
2297
2298   DCHECK_LE(draw_cache_.matrix_data.size(),
2299             static_cast<size_t>(std::numeric_limits<int>::max()) / 6u);
2300   // Draw the quads!
2301   gl_->DrawElements(GL_TRIANGLES,
2302                     6 * static_cast<int>(draw_cache_.matrix_data.size()),
2303                     GL_UNSIGNED_SHORT, 0);
2304
2305   // Clear the cache.
2306   draw_cache_.program_id = -1;
2307   draw_cache_.uv_xform_data.resize(0);
2308   draw_cache_.vertex_opacity_data.resize(0);
2309   draw_cache_.matrix_data.resize(0);
2310
2311   // If we had a clipped binding, prepare the shared binding for the
2312   // next inserts.
2313   if (flush_binding == CLIPPED_BINDING) {
2314     PrepareGeometry(SHARED_BINDING);
2315   }
2316 }
2317
2318 void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
2319                                     const TextureDrawQuad* quad,
2320                                     const gfx::QuadF* clip_region) {
2321   // If we have a clip_region then we have to render the next quad
2322   // with dynamic geometry, therefore we must flush all pending
2323   // texture quads.
2324   if (clip_region) {
2325     // We send in false here because we want to flush what's currently in the
2326     // queue using the shared_geometry and not clipped_geometry
2327     FlushTextureQuadCache(SHARED_BINDING);
2328   }
2329
2330   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2331       gl_, &highp_threshold_cache_, highp_threshold_min_,
2332       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2333
2334   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2335                                           quad->resource_id());
2336   const SamplerType sampler = SamplerTypeFromTextureTarget(lock.target());
2337   // Choose the correct texture program binding
2338   TexTransformTextureProgramBinding binding;
2339   if (quad->premultiplied_alpha) {
2340     if (quad->background_color == SK_ColorTRANSPARENT) {
2341       binding.Set(GetTextureProgram(tex_coord_precision, sampler));
2342     } else {
2343       binding.Set(GetTextureBackgroundProgram(tex_coord_precision, sampler));
2344     }
2345   } else {
2346     if (quad->background_color == SK_ColorTRANSPARENT) {
2347       binding.Set(
2348           GetNonPremultipliedTextureProgram(tex_coord_precision, sampler));
2349     } else {
2350       binding.Set(GetNonPremultipliedTextureBackgroundProgram(
2351           tex_coord_precision, sampler));
2352     }
2353   }
2354
2355   int resource_id = quad->resource_id();
2356
2357   if (draw_cache_.program_id != binding.program_id ||
2358       draw_cache_.resource_id != resource_id ||
2359       draw_cache_.needs_blending != quad->ShouldDrawWithBlending() ||
2360       draw_cache_.nearest_neighbor != quad->nearest_neighbor ||
2361       draw_cache_.background_color != quad->background_color ||
2362       draw_cache_.matrix_data.size() >= 8) {
2363     FlushTextureQuadCache(SHARED_BINDING);
2364     draw_cache_.program_id = binding.program_id;
2365     draw_cache_.resource_id = resource_id;
2366     draw_cache_.needs_blending = quad->ShouldDrawWithBlending();
2367     draw_cache_.nearest_neighbor = quad->nearest_neighbor;
2368     draw_cache_.background_color = quad->background_color;
2369
2370     draw_cache_.uv_xform_location = binding.tex_transform_location;
2371     draw_cache_.background_color_location = binding.background_color_location;
2372     draw_cache_.vertex_opacity_location = binding.vertex_opacity_location;
2373     draw_cache_.matrix_location = binding.matrix_location;
2374     draw_cache_.sampler_location = binding.sampler_location;
2375   }
2376
2377   // Generate the uv-transform
2378   if (!clip_region) {
2379     draw_cache_.uv_xform_data.push_back(UVTransform(quad));
2380   } else {
2381     Float4 uv_transform = {{0.0f, 0.0f, 1.0f, 1.0f}};
2382     draw_cache_.uv_xform_data.push_back(uv_transform);
2383   }
2384
2385   // Generate the vertex opacity
2386   const float opacity = quad->shared_quad_state->opacity;
2387   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[0] * opacity);
2388   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[1] * opacity);
2389   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[2] * opacity);
2390   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[3] * opacity);
2391
2392   // Generate the transform matrix
2393   gfx::Transform quad_rect_matrix;
2394   QuadRectTransform(&quad_rect_matrix,
2395                     quad->shared_quad_state->quad_to_target_transform,
2396                     quad->rect);
2397   quad_rect_matrix = frame->projection_matrix * quad_rect_matrix;
2398
2399   Float16 m;
2400   quad_rect_matrix.matrix().asColMajorf(m.data);
2401   draw_cache_.matrix_data.push_back(m);
2402
2403   if (clip_region) {
2404     gfx::QuadF scaled_region;
2405     if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
2406       scaled_region = SharedGeometryQuad().BoundingBox();
2407     }
2408     // Both the scaled region and the SharedGeomtryQuad are in the space
2409     // -0.5->0.5. We need to move that to the space 0->1.
2410     float uv[8];
2411     uv[0] = scaled_region.p1().x() + 0.5f;
2412     uv[1] = scaled_region.p1().y() + 0.5f;
2413     uv[2] = scaled_region.p2().x() + 0.5f;
2414     uv[3] = scaled_region.p2().y() + 0.5f;
2415     uv[4] = scaled_region.p3().x() + 0.5f;
2416     uv[5] = scaled_region.p3().y() + 0.5f;
2417     uv[6] = scaled_region.p4().x() + 0.5f;
2418     uv[7] = scaled_region.p4().y() + 0.5f;
2419     PrepareGeometry(CLIPPED_BINDING);
2420     clipped_geometry_->InitializeCustomQuadWithUVs(scaled_region, uv);
2421     FlushTextureQuadCache(CLIPPED_BINDING);
2422   }
2423 }
2424
2425 void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
2426                                    const IOSurfaceDrawQuad* quad,
2427                                    const gfx::QuadF* clip_region) {
2428   SetBlendEnabled(quad->ShouldDrawWithBlending());
2429
2430   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2431       gl_, &highp_threshold_cache_, highp_threshold_min_,
2432       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2433
2434   TexTransformTextureProgramBinding binding;
2435   binding.Set(GetTextureIOSurfaceProgram(tex_coord_precision));
2436
2437   SetUseProgram(binding.program_id);
2438   gl_->Uniform1i(binding.sampler_location, 0);
2439   if (quad->orientation == IOSurfaceDrawQuad::FLIPPED) {
2440     gl_->Uniform4f(
2441         binding.tex_transform_location, 0, quad->io_surface_size.height(),
2442         quad->io_surface_size.width(), quad->io_surface_size.height() * -1.0f);
2443   } else {
2444     gl_->Uniform4f(binding.tex_transform_location, 0, 0,
2445                    quad->io_surface_size.width(),
2446                    quad->io_surface_size.height());
2447   }
2448
2449   const float vertex_opacity[] = {quad->shared_quad_state->opacity,
2450                                   quad->shared_quad_state->opacity,
2451                                   quad->shared_quad_state->opacity,
2452                                   quad->shared_quad_state->opacity};
2453   gl_->Uniform1fv(binding.vertex_opacity_location, 4, vertex_opacity);
2454
2455   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2456                                           quad->io_surface_resource_id());
2457   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2458   gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, lock.texture_id());
2459
2460   if (!clip_region) {
2461     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2462                      quad->rect, binding.matrix_location);
2463   } else {
2464     float uvs[8] = {0};
2465     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2466     DrawQuadGeometryClippedByQuadF(
2467         frame, quad->shared_quad_state->quad_to_target_transform, quad->rect,
2468         *clip_region, binding.matrix_location, uvs);
2469   }
2470
2471   gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
2472 }
2473
2474 void GLRenderer::FinishDrawingFrame(DrawingFrame* frame) {
2475   if (use_sync_query_) {
2476     DCHECK(current_sync_query_);
2477     current_sync_query_->End();
2478     pending_sync_queries_.push_back(current_sync_query_.Pass());
2479   }
2480
2481   current_framebuffer_lock_ = nullptr;
2482   swap_buffer_rect_.Union(gfx::ToEnclosingRect(frame->root_damage_rect));
2483
2484   gl_->Disable(GL_BLEND);
2485   blend_shadow_ = false;
2486
2487   ScheduleOverlays(frame);
2488 }
2489
2490 void GLRenderer::FinishDrawingQuadList() {
2491   FlushTextureQuadCache(SHARED_BINDING);
2492 }
2493
2494 bool GLRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
2495   if (frame->current_render_pass != frame->root_render_pass)
2496     return true;
2497   return FlippedRootFramebuffer();
2498 }
2499
2500 bool GLRenderer::FlippedRootFramebuffer() const {
2501   // GL is normally flipped, so a flipped output results in an unflipping.
2502   return !output_surface_->capabilities().flipped_output_surface;
2503 }
2504
2505 void GLRenderer::EnsureScissorTestEnabled() {
2506   if (is_scissor_enabled_)
2507     return;
2508
2509   FlushTextureQuadCache(SHARED_BINDING);
2510   gl_->Enable(GL_SCISSOR_TEST);
2511   is_scissor_enabled_ = true;
2512 }
2513
2514 void GLRenderer::EnsureScissorTestDisabled() {
2515   if (!is_scissor_enabled_)
2516     return;
2517
2518   FlushTextureQuadCache(SHARED_BINDING);
2519   gl_->Disable(GL_SCISSOR_TEST);
2520   is_scissor_enabled_ = false;
2521 }
2522
2523 void GLRenderer::CopyCurrentRenderPassToBitmap(
2524     DrawingFrame* frame,
2525     scoped_ptr<CopyOutputRequest> request) {
2526   TRACE_EVENT0("cc", "GLRenderer::CopyCurrentRenderPassToBitmap");
2527   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
2528   if (request->has_area())
2529     copy_rect.Intersect(request->area());
2530   GetFramebufferPixelsAsync(frame, copy_rect, request.Pass());
2531 }
2532
2533 void GLRenderer::ToGLMatrix(float* gl_matrix, const gfx::Transform& transform) {
2534   transform.matrix().asColMajorf(gl_matrix);
2535 }
2536
2537 void GLRenderer::SetShaderQuadF(const gfx::QuadF& quad, int quad_location) {
2538   if (quad_location == -1)
2539     return;
2540
2541   float gl_quad[8];
2542   gl_quad[0] = quad.p1().x();
2543   gl_quad[1] = quad.p1().y();
2544   gl_quad[2] = quad.p2().x();
2545   gl_quad[3] = quad.p2().y();
2546   gl_quad[4] = quad.p3().x();
2547   gl_quad[5] = quad.p3().y();
2548   gl_quad[6] = quad.p4().x();
2549   gl_quad[7] = quad.p4().y();
2550   gl_->Uniform2fv(quad_location, 4, gl_quad);
2551 }
2552
2553 void GLRenderer::SetShaderOpacity(float opacity, int alpha_location) {
2554   if (alpha_location != -1)
2555     gl_->Uniform1f(alpha_location, opacity);
2556 }
2557
2558 void GLRenderer::SetStencilEnabled(bool enabled) {
2559   if (enabled == stencil_shadow_)
2560     return;
2561
2562   if (enabled)
2563     gl_->Enable(GL_STENCIL_TEST);
2564   else
2565     gl_->Disable(GL_STENCIL_TEST);
2566   stencil_shadow_ = enabled;
2567 }
2568
2569 void GLRenderer::SetBlendEnabled(bool enabled) {
2570   if (enabled == blend_shadow_)
2571     return;
2572
2573   if (enabled)
2574     gl_->Enable(GL_BLEND);
2575   else
2576     gl_->Disable(GL_BLEND);
2577   blend_shadow_ = enabled;
2578 }
2579
2580 void GLRenderer::SetUseProgram(unsigned program) {
2581   if (program == program_shadow_)
2582     return;
2583   gl_->UseProgram(program);
2584   program_shadow_ = program;
2585 }
2586
2587 void GLRenderer::DrawQuadGeometryClippedByQuadF(
2588     const DrawingFrame* frame,
2589     const gfx::Transform& draw_transform,
2590     const gfx::RectF& quad_rect,
2591     const gfx::QuadF& clipping_region_quad,
2592     int matrix_location,
2593     const float* uvs) {
2594   PrepareGeometry(CLIPPED_BINDING);
2595   if (uvs) {
2596     clipped_geometry_->InitializeCustomQuadWithUVs(clipping_region_quad, uvs);
2597   } else {
2598     clipped_geometry_->InitializeCustomQuad(clipping_region_quad);
2599   }
2600   gfx::Transform quad_rect_matrix;
2601   QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
2602   static float gl_matrix[16];
2603   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
2604   gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]);
2605
2606   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT,
2607                     reinterpret_cast<const void*>(0));
2608 }
2609
2610 void GLRenderer::DrawQuadGeometry(const DrawingFrame* frame,
2611                                   const gfx::Transform& draw_transform,
2612                                   const gfx::RectF& quad_rect,
2613                                   int matrix_location) {
2614   PrepareGeometry(SHARED_BINDING);
2615   gfx::Transform quad_rect_matrix;
2616   QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
2617   static float gl_matrix[16];
2618   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
2619   gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]);
2620
2621   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
2622 }
2623
2624 void GLRenderer::Finish() {
2625   TRACE_EVENT0("cc", "GLRenderer::Finish");
2626   gl_->Finish();
2627 }
2628
2629 void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
2630   DCHECK(!is_backbuffer_discarded_);
2631
2632   TRACE_EVENT0("cc,benchmark", "GLRenderer::SwapBuffers");
2633   // We're done! Time to swapbuffers!
2634
2635   gfx::Size surface_size = output_surface_->SurfaceSize();
2636
2637   CompositorFrame compositor_frame;
2638   compositor_frame.metadata = metadata;
2639   compositor_frame.gl_frame_data = make_scoped_ptr(new GLFrameData);
2640   compositor_frame.gl_frame_data->size = surface_size;
2641   if (capabilities_.using_partial_swap) {
2642     // If supported, we can save significant bandwidth by only swapping the
2643     // damaged/scissored region (clamped to the viewport).
2644     swap_buffer_rect_.Intersect(gfx::Rect(surface_size));
2645     int flipped_y_pos_of_rect_bottom = surface_size.height() -
2646                                        swap_buffer_rect_.y() -
2647                                        swap_buffer_rect_.height();
2648     compositor_frame.gl_frame_data->sub_buffer_rect =
2649         gfx::Rect(swap_buffer_rect_.x(),
2650                   FlippedRootFramebuffer() ? flipped_y_pos_of_rect_bottom
2651                                            : swap_buffer_rect_.y(),
2652                   swap_buffer_rect_.width(),
2653                   swap_buffer_rect_.height());
2654   } else {
2655     compositor_frame.gl_frame_data->sub_buffer_rect =
2656         gfx::Rect(output_surface_->SurfaceSize());
2657   }
2658   output_surface_->SwapBuffers(&compositor_frame);
2659
2660   // Release previously used overlay resources and hold onto the pending ones
2661   // until the next swap buffers.
2662   in_use_overlay_resources_.clear();
2663   in_use_overlay_resources_.swap(pending_overlay_resources_);
2664
2665   swap_buffer_rect_ = gfx::Rect();
2666 }
2667
2668 void GLRenderer::EnforceMemoryPolicy() {
2669   if (!visible()) {
2670     TRACE_EVENT0("cc", "GLRenderer::EnforceMemoryPolicy dropping resources");
2671     ReleaseRenderPassTextures();
2672     DiscardBackbuffer();
2673     output_surface_->context_provider()->DeleteCachedResources();
2674     gl_->Flush();
2675   }
2676   PrepareGeometry(NO_BINDING);
2677 }
2678
2679 void GLRenderer::DiscardBackbuffer() {
2680   if (is_backbuffer_discarded_)
2681     return;
2682
2683   output_surface_->DiscardBackbuffer();
2684
2685   is_backbuffer_discarded_ = true;
2686
2687   // Damage tracker needs a full reset every time framebuffer is discarded.
2688   client_->SetFullRootLayerDamage();
2689 }
2690
2691 void GLRenderer::EnsureBackbuffer() {
2692   if (!is_backbuffer_discarded_)
2693     return;
2694
2695   output_surface_->EnsureBackbuffer();
2696   is_backbuffer_discarded_ = false;
2697 }
2698
2699 void GLRenderer::GetFramebufferPixelsAsync(
2700     const DrawingFrame* frame,
2701     const gfx::Rect& rect,
2702     scoped_ptr<CopyOutputRequest> request) {
2703   DCHECK(!request->IsEmpty());
2704   if (request->IsEmpty())
2705     return;
2706   if (rect.IsEmpty())
2707     return;
2708
2709   gfx::Rect window_rect = MoveFromDrawToWindowSpace(frame, rect);
2710   DCHECK_GE(window_rect.x(), 0);
2711   DCHECK_GE(window_rect.y(), 0);
2712   DCHECK_LE(window_rect.right(), current_surface_size_.width());
2713   DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
2714
2715   if (!request->force_bitmap_result()) {
2716     bool own_mailbox = !request->has_texture_mailbox();
2717
2718     GLuint texture_id = 0;
2719     gpu::Mailbox mailbox;
2720     if (own_mailbox) {
2721       gl_->GenMailboxCHROMIUM(mailbox.name);
2722       gl_->GenTextures(1, &texture_id);
2723       gl_->BindTexture(GL_TEXTURE_2D, texture_id);
2724
2725       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2726       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
2727       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2728       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2729       gl_->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
2730     } else {
2731       mailbox = request->texture_mailbox().mailbox();
2732       DCHECK_EQ(static_cast<unsigned>(GL_TEXTURE_2D),
2733                 request->texture_mailbox().target());
2734       DCHECK(!mailbox.IsZero());
2735       unsigned incoming_sync_point = request->texture_mailbox().sync_point();
2736       if (incoming_sync_point)
2737         gl_->WaitSyncPointCHROMIUM(incoming_sync_point);
2738
2739       texture_id =
2740           gl_->CreateAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
2741     }
2742     GetFramebufferTexture(texture_id, RGBA_8888, window_rect);
2743
2744     unsigned sync_point = gl_->InsertSyncPointCHROMIUM();
2745     TextureMailbox texture_mailbox(mailbox, GL_TEXTURE_2D, sync_point);
2746
2747     scoped_ptr<SingleReleaseCallback> release_callback;
2748     if (own_mailbox) {
2749       gl_->BindTexture(GL_TEXTURE_2D, 0);
2750       release_callback = texture_mailbox_deleter_->GetReleaseCallback(
2751           output_surface_->context_provider(), texture_id);
2752     } else {
2753       gl_->DeleteTextures(1, &texture_id);
2754     }
2755
2756     request->SendTextureResult(
2757         window_rect.size(), texture_mailbox, release_callback.Pass());
2758     return;
2759   }
2760
2761   DCHECK(request->force_bitmap_result());
2762
2763   scoped_ptr<PendingAsyncReadPixels> pending_read(new PendingAsyncReadPixels);
2764   pending_read->copy_request = request.Pass();
2765   pending_async_read_pixels_.insert(pending_async_read_pixels_.begin(),
2766                                     pending_read.Pass());
2767
2768   bool do_workaround = NeedsIOSurfaceReadbackWorkaround();
2769
2770   unsigned temporary_texture = 0;
2771   unsigned temporary_fbo = 0;
2772
2773   if (do_workaround) {
2774     // On Mac OS X, calling glReadPixels() against an FBO whose color attachment
2775     // is an IOSurface-backed texture causes corruption of future glReadPixels()
2776     // calls, even those on different OpenGL contexts. It is believed that this
2777     // is the root cause of top crasher
2778     // http://crbug.com/99393. <rdar://problem/10949687>
2779
2780     gl_->GenTextures(1, &temporary_texture);
2781     gl_->BindTexture(GL_TEXTURE_2D, temporary_texture);
2782     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2783     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
2784     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2785     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2786     // Copy the contents of the current (IOSurface-backed) framebuffer into a
2787     // temporary texture.
2788     GetFramebufferTexture(
2789         temporary_texture, RGBA_8888, gfx::Rect(current_surface_size_));
2790     gl_->GenFramebuffers(1, &temporary_fbo);
2791     // Attach this texture to an FBO, and perform the readback from that FBO.
2792     gl_->BindFramebuffer(GL_FRAMEBUFFER, temporary_fbo);
2793     gl_->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
2794                               GL_TEXTURE_2D, temporary_texture, 0);
2795
2796     DCHECK_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
2797               gl_->CheckFramebufferStatus(GL_FRAMEBUFFER));
2798   }
2799
2800   GLuint buffer = 0;
2801   gl_->GenBuffers(1, &buffer);
2802   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, buffer);
2803   gl_->BufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
2804                   4 * window_rect.size().GetArea(), NULL, GL_STREAM_READ);
2805
2806   GLuint query = 0;
2807   gl_->GenQueriesEXT(1, &query);
2808   gl_->BeginQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM, query);
2809
2810   gl_->ReadPixels(window_rect.x(), window_rect.y(), window_rect.width(),
2811                   window_rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, NULL);
2812
2813   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
2814
2815   if (do_workaround) {
2816     // Clean up.
2817     gl_->BindFramebuffer(GL_FRAMEBUFFER, 0);
2818     gl_->BindTexture(GL_TEXTURE_2D, 0);
2819     gl_->DeleteFramebuffers(1, &temporary_fbo);
2820     gl_->DeleteTextures(1, &temporary_texture);
2821   }
2822
2823   base::Closure finished_callback = base::Bind(&GLRenderer::FinishedReadback,
2824                                                base::Unretained(this),
2825                                                buffer,
2826                                                query,
2827                                                window_rect.size());
2828   // Save the finished_callback so it can be cancelled.
2829   pending_async_read_pixels_.front()->finished_read_pixels_callback.Reset(
2830       finished_callback);
2831   base::Closure cancelable_callback =
2832       pending_async_read_pixels_.front()->
2833           finished_read_pixels_callback.callback();
2834
2835   // Save the buffer to verify the callbacks happen in the expected order.
2836   pending_async_read_pixels_.front()->buffer = buffer;
2837
2838   gl_->EndQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM);
2839   context_support_->SignalQuery(query, cancelable_callback);
2840
2841   EnforceMemoryPolicy();
2842 }
2843
2844 void GLRenderer::FinishedReadback(unsigned source_buffer,
2845                                   unsigned query,
2846                                   const gfx::Size& size) {
2847   DCHECK(!pending_async_read_pixels_.empty());
2848
2849   if (query != 0) {
2850     gl_->DeleteQueriesEXT(1, &query);
2851   }
2852
2853   PendingAsyncReadPixels* current_read = pending_async_read_pixels_.back();
2854   // Make sure we service the readbacks in order.
2855   DCHECK_EQ(source_buffer, current_read->buffer);
2856
2857   uint8* src_pixels = NULL;
2858   scoped_ptr<SkBitmap> bitmap;
2859
2860   if (source_buffer != 0) {
2861     gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, source_buffer);
2862     src_pixels = static_cast<uint8*>(gl_->MapBufferCHROMIUM(
2863         GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, GL_READ_ONLY));
2864
2865     if (src_pixels) {
2866       bitmap.reset(new SkBitmap);
2867       bitmap->allocN32Pixels(size.width(), size.height());
2868       scoped_ptr<SkAutoLockPixels> lock(new SkAutoLockPixels(*bitmap));
2869       uint8* dest_pixels = static_cast<uint8*>(bitmap->getPixels());
2870
2871       size_t row_bytes = size.width() * 4;
2872       int num_rows = size.height();
2873       size_t total_bytes = num_rows * row_bytes;
2874       for (size_t dest_y = 0; dest_y < total_bytes; dest_y += row_bytes) {
2875         // Flip Y axis.
2876         size_t src_y = total_bytes - dest_y - row_bytes;
2877         // Swizzle OpenGL -> Skia byte order.
2878         for (size_t x = 0; x < row_bytes; x += 4) {
2879           dest_pixels[dest_y + x + SK_R32_SHIFT / 8] =
2880               src_pixels[src_y + x + 0];
2881           dest_pixels[dest_y + x + SK_G32_SHIFT / 8] =
2882               src_pixels[src_y + x + 1];
2883           dest_pixels[dest_y + x + SK_B32_SHIFT / 8] =
2884               src_pixels[src_y + x + 2];
2885           dest_pixels[dest_y + x + SK_A32_SHIFT / 8] =
2886               src_pixels[src_y + x + 3];
2887         }
2888       }
2889
2890       gl_->UnmapBufferCHROMIUM(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM);
2891     }
2892     gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
2893     gl_->DeleteBuffers(1, &source_buffer);
2894   }
2895
2896   if (bitmap)
2897     current_read->copy_request->SendBitmapResult(bitmap.Pass());
2898   pending_async_read_pixels_.pop_back();
2899 }
2900
2901 void GLRenderer::GetFramebufferTexture(unsigned texture_id,
2902                                        ResourceFormat texture_format,
2903                                        const gfx::Rect& window_rect) {
2904   DCHECK(texture_id);
2905   DCHECK_GE(window_rect.x(), 0);
2906   DCHECK_GE(window_rect.y(), 0);
2907   DCHECK_LE(window_rect.right(), current_surface_size_.width());
2908   DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
2909
2910   gl_->BindTexture(GL_TEXTURE_2D, texture_id);
2911   gl_->CopyTexImage2D(GL_TEXTURE_2D, 0, GLDataFormat(texture_format),
2912                       window_rect.x(), window_rect.y(), window_rect.width(),
2913                       window_rect.height(), 0);
2914   gl_->BindTexture(GL_TEXTURE_2D, 0);
2915 }
2916
2917 bool GLRenderer::UseScopedTexture(DrawingFrame* frame,
2918                                   const ScopedResource* texture,
2919                                   const gfx::Rect& viewport_rect) {
2920   DCHECK(texture->id());
2921   frame->current_render_pass = NULL;
2922   frame->current_texture = texture;
2923
2924   return BindFramebufferToTexture(frame, texture, viewport_rect);
2925 }
2926
2927 void GLRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
2928   current_framebuffer_lock_ = nullptr;
2929   output_surface_->BindFramebuffer();
2930
2931   if (output_surface_->HasExternalStencilTest()) {
2932     SetStencilEnabled(true);
2933     gl_->StencilFunc(GL_EQUAL, 1, 1);
2934   } else {
2935     SetStencilEnabled(false);
2936   }
2937 }
2938
2939 bool GLRenderer::BindFramebufferToTexture(DrawingFrame* frame,
2940                                           const ScopedResource* texture,
2941                                           const gfx::Rect& target_rect) {
2942   DCHECK(texture->id());
2943
2944   // Explicitly release lock, otherwise we can crash when try to lock
2945   // same texture again.
2946   current_framebuffer_lock_ = nullptr;
2947
2948   SetStencilEnabled(false);
2949   gl_->BindFramebuffer(GL_FRAMEBUFFER, offscreen_framebuffer_id_);
2950   current_framebuffer_lock_ =
2951       make_scoped_ptr(new ResourceProvider::ScopedWriteLockGL(
2952           resource_provider_, texture->id()));
2953   unsigned texture_id = current_framebuffer_lock_->texture_id();
2954   gl_->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
2955                             texture_id, 0);
2956
2957   DCHECK(gl_->CheckFramebufferStatus(GL_FRAMEBUFFER) ==
2958              GL_FRAMEBUFFER_COMPLETE ||
2959          IsContextLost());
2960   return true;
2961 }
2962
2963 void GLRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
2964   EnsureScissorTestEnabled();
2965
2966   // Don't unnecessarily ask the context to change the scissor, because it
2967   // may cause undesired GPU pipeline flushes.
2968   if (scissor_rect == scissor_rect_ && !scissor_rect_needs_reset_)
2969     return;
2970
2971   scissor_rect_ = scissor_rect;
2972   FlushTextureQuadCache(SHARED_BINDING);
2973   gl_->Scissor(scissor_rect.x(), scissor_rect.y(), scissor_rect.width(),
2974                scissor_rect.height());
2975
2976   scissor_rect_needs_reset_ = false;
2977 }
2978
2979 void GLRenderer::SetViewport() {
2980   gl_->Viewport(current_window_space_viewport_.x(),
2981                 current_window_space_viewport_.y(),
2982                 current_window_space_viewport_.width(),
2983                 current_window_space_viewport_.height());
2984 }
2985
2986 void GLRenderer::InitializeSharedObjects() {
2987   TRACE_EVENT0("cc", "GLRenderer::InitializeSharedObjects");
2988
2989   // Create an FBO for doing offscreen rendering.
2990   gl_->GenFramebuffers(1, &offscreen_framebuffer_id_);
2991
2992   shared_geometry_ =
2993       make_scoped_ptr(new StaticGeometryBinding(gl_, QuadVertexRect()));
2994   clipped_geometry_ = make_scoped_ptr(new DynamicGeometryBinding(gl_));
2995 }
2996
2997 void GLRenderer::PrepareGeometry(BoundGeometry binding) {
2998   if (binding == bound_geometry_) {
2999     return;
3000   }
3001
3002   switch (binding) {
3003     case SHARED_BINDING:
3004       shared_geometry_->PrepareForDraw();
3005       break;
3006     case CLIPPED_BINDING:
3007       clipped_geometry_->PrepareForDraw();
3008       break;
3009     case NO_BINDING:
3010       break;
3011   }
3012   bound_geometry_ = binding;
3013 }
3014
3015 const GLRenderer::TileCheckerboardProgram*
3016 GLRenderer::GetTileCheckerboardProgram() {
3017   if (!tile_checkerboard_program_.initialized()) {
3018     TRACE_EVENT0("cc", "GLRenderer::checkerboardProgram::initalize");
3019     tile_checkerboard_program_.Initialize(output_surface_->context_provider(),
3020                                           TEX_COORD_PRECISION_NA,
3021                                           SAMPLER_TYPE_NA);
3022   }
3023   return &tile_checkerboard_program_;
3024 }
3025
3026 const GLRenderer::DebugBorderProgram* GLRenderer::GetDebugBorderProgram() {
3027   if (!debug_border_program_.initialized()) {
3028     TRACE_EVENT0("cc", "GLRenderer::debugBorderProgram::initialize");
3029     debug_border_program_.Initialize(output_surface_->context_provider(),
3030                                      TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
3031   }
3032   return &debug_border_program_;
3033 }
3034
3035 const GLRenderer::SolidColorProgram* GLRenderer::GetSolidColorProgram() {
3036   if (!solid_color_program_.initialized()) {
3037     TRACE_EVENT0("cc", "GLRenderer::solidColorProgram::initialize");
3038     solid_color_program_.Initialize(output_surface_->context_provider(),
3039                                     TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
3040   }
3041   return &solid_color_program_;
3042 }
3043
3044 const GLRenderer::SolidColorProgramAA* GLRenderer::GetSolidColorProgramAA() {
3045   if (!solid_color_program_aa_.initialized()) {
3046     TRACE_EVENT0("cc", "GLRenderer::solidColorProgramAA::initialize");
3047     solid_color_program_aa_.Initialize(output_surface_->context_provider(),
3048                                        TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
3049   }
3050   return &solid_color_program_aa_;
3051 }
3052
3053 const GLRenderer::RenderPassProgram* GLRenderer::GetRenderPassProgram(
3054     TexCoordPrecision precision,
3055     BlendMode blend_mode) {
3056   DCHECK_GE(precision, 0);
3057   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3058   DCHECK_GE(blend_mode, 0);
3059   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3060   RenderPassProgram* program = &render_pass_program_[precision][blend_mode];
3061   if (!program->initialized()) {
3062     TRACE_EVENT0("cc", "GLRenderer::renderPassProgram::initialize");
3063     program->Initialize(output_surface_->context_provider(), precision,
3064                         SAMPLER_TYPE_2D, blend_mode);
3065   }
3066   return program;
3067 }
3068
3069 const GLRenderer::RenderPassProgramAA* GLRenderer::GetRenderPassProgramAA(
3070     TexCoordPrecision precision,
3071     BlendMode blend_mode) {
3072   DCHECK_GE(precision, 0);
3073   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3074   DCHECK_GE(blend_mode, 0);
3075   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3076   RenderPassProgramAA* program =
3077       &render_pass_program_aa_[precision][blend_mode];
3078   if (!program->initialized()) {
3079     TRACE_EVENT0("cc", "GLRenderer::renderPassProgramAA::initialize");
3080     program->Initialize(output_surface_->context_provider(), precision,
3081                         SAMPLER_TYPE_2D, blend_mode);
3082   }
3083   return program;
3084 }
3085
3086 const GLRenderer::RenderPassMaskProgram* GLRenderer::GetRenderPassMaskProgram(
3087     TexCoordPrecision precision,
3088     SamplerType sampler,
3089     BlendMode blend_mode,
3090     bool mask_for_background) {
3091   DCHECK_GE(precision, 0);
3092   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3093   DCHECK_GE(sampler, 0);
3094   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3095   DCHECK_GE(blend_mode, 0);
3096   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3097   RenderPassMaskProgram* program =
3098       &render_pass_mask_program_[precision][sampler][blend_mode]
3099                                 [mask_for_background ? HAS_MASK : NO_MASK];
3100   if (!program->initialized()) {
3101     TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgram::initialize");
3102     program->Initialize(
3103         output_surface_->context_provider(), precision,
3104         sampler, blend_mode, mask_for_background);
3105   }
3106   return program;
3107 }
3108
3109 const GLRenderer::RenderPassMaskProgramAA*
3110 GLRenderer::GetRenderPassMaskProgramAA(TexCoordPrecision precision,
3111                                        SamplerType sampler,
3112                                        BlendMode blend_mode,
3113                                        bool mask_for_background) {
3114   DCHECK_GE(precision, 0);
3115   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3116   DCHECK_GE(sampler, 0);
3117   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3118   DCHECK_GE(blend_mode, 0);
3119   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3120   RenderPassMaskProgramAA* program =
3121       &render_pass_mask_program_aa_[precision][sampler][blend_mode]
3122                                    [mask_for_background ? HAS_MASK : NO_MASK];
3123   if (!program->initialized()) {
3124     TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgramAA::initialize");
3125     program->Initialize(
3126         output_surface_->context_provider(), precision,
3127         sampler, blend_mode, mask_for_background);
3128   }
3129   return program;
3130 }
3131
3132 const GLRenderer::RenderPassColorMatrixProgram*
3133 GLRenderer::GetRenderPassColorMatrixProgram(TexCoordPrecision precision,
3134                                             BlendMode blend_mode) {
3135   DCHECK_GE(precision, 0);
3136   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3137   DCHECK_GE(blend_mode, 0);
3138   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3139   RenderPassColorMatrixProgram* program =
3140       &render_pass_color_matrix_program_[precision][blend_mode];
3141   if (!program->initialized()) {
3142     TRACE_EVENT0("cc", "GLRenderer::renderPassColorMatrixProgram::initialize");
3143     program->Initialize(output_surface_->context_provider(), precision,
3144                         SAMPLER_TYPE_2D, blend_mode);
3145   }
3146   return program;
3147 }
3148
3149 const GLRenderer::RenderPassColorMatrixProgramAA*
3150 GLRenderer::GetRenderPassColorMatrixProgramAA(TexCoordPrecision precision,
3151                                               BlendMode blend_mode) {
3152   DCHECK_GE(precision, 0);
3153   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3154   DCHECK_GE(blend_mode, 0);
3155   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3156   RenderPassColorMatrixProgramAA* program =
3157       &render_pass_color_matrix_program_aa_[precision][blend_mode];
3158   if (!program->initialized()) {
3159     TRACE_EVENT0("cc",
3160                  "GLRenderer::renderPassColorMatrixProgramAA::initialize");
3161     program->Initialize(output_surface_->context_provider(), precision,
3162                         SAMPLER_TYPE_2D, blend_mode);
3163   }
3164   return program;
3165 }
3166
3167 const GLRenderer::RenderPassMaskColorMatrixProgram*
3168 GLRenderer::GetRenderPassMaskColorMatrixProgram(
3169     TexCoordPrecision precision,
3170     SamplerType sampler,
3171     BlendMode blend_mode,
3172     bool mask_for_background) {
3173   DCHECK_GE(precision, 0);
3174   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3175   DCHECK_GE(sampler, 0);
3176   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3177   DCHECK_GE(blend_mode, 0);
3178   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3179   RenderPassMaskColorMatrixProgram* program =
3180       &render_pass_mask_color_matrix_program_[precision][sampler][blend_mode]
3181           [mask_for_background ? HAS_MASK : NO_MASK];
3182   if (!program->initialized()) {
3183     TRACE_EVENT0("cc",
3184                  "GLRenderer::renderPassMaskColorMatrixProgram::initialize");
3185     program->Initialize(
3186         output_surface_->context_provider(), precision,
3187         sampler, blend_mode, mask_for_background);
3188   }
3189   return program;
3190 }
3191
3192 const GLRenderer::RenderPassMaskColorMatrixProgramAA*
3193 GLRenderer::GetRenderPassMaskColorMatrixProgramAA(
3194     TexCoordPrecision precision,
3195     SamplerType sampler,
3196     BlendMode blend_mode,
3197     bool mask_for_background) {
3198   DCHECK_GE(precision, 0);
3199   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3200   DCHECK_GE(sampler, 0);
3201   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3202   DCHECK_GE(blend_mode, 0);
3203   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3204   RenderPassMaskColorMatrixProgramAA* program =
3205       &render_pass_mask_color_matrix_program_aa_[precision][sampler][blend_mode]
3206           [mask_for_background ? HAS_MASK : NO_MASK];
3207   if (!program->initialized()) {
3208     TRACE_EVENT0("cc",
3209                  "GLRenderer::renderPassMaskColorMatrixProgramAA::initialize");
3210     program->Initialize(
3211         output_surface_->context_provider(), precision,
3212         sampler, blend_mode, mask_for_background);
3213   }
3214   return program;
3215 }
3216
3217 const GLRenderer::TileProgram* GLRenderer::GetTileProgram(
3218     TexCoordPrecision precision,
3219     SamplerType sampler) {
3220   DCHECK_GE(precision, 0);
3221   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3222   DCHECK_GE(sampler, 0);
3223   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3224   TileProgram* program = &tile_program_[precision][sampler];
3225   if (!program->initialized()) {
3226     TRACE_EVENT0("cc", "GLRenderer::tileProgram::initialize");
3227     program->Initialize(
3228         output_surface_->context_provider(), precision, sampler);
3229   }
3230   return program;
3231 }
3232
3233 const GLRenderer::TileProgramOpaque* GLRenderer::GetTileProgramOpaque(
3234     TexCoordPrecision precision,
3235     SamplerType sampler) {
3236   DCHECK_GE(precision, 0);
3237   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3238   DCHECK_GE(sampler, 0);
3239   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3240   TileProgramOpaque* program = &tile_program_opaque_[precision][sampler];
3241   if (!program->initialized()) {
3242     TRACE_EVENT0("cc", "GLRenderer::tileProgramOpaque::initialize");
3243     program->Initialize(
3244         output_surface_->context_provider(), precision, sampler);
3245   }
3246   return program;
3247 }
3248
3249 const GLRenderer::TileProgramAA* GLRenderer::GetTileProgramAA(
3250     TexCoordPrecision precision,
3251     SamplerType sampler) {
3252   DCHECK_GE(precision, 0);
3253   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3254   DCHECK_GE(sampler, 0);
3255   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3256   TileProgramAA* program = &tile_program_aa_[precision][sampler];
3257   if (!program->initialized()) {
3258     TRACE_EVENT0("cc", "GLRenderer::tileProgramAA::initialize");
3259     program->Initialize(
3260         output_surface_->context_provider(), precision, sampler);
3261   }
3262   return program;
3263 }
3264
3265 const GLRenderer::TileProgramSwizzle* GLRenderer::GetTileProgramSwizzle(
3266     TexCoordPrecision precision,
3267     SamplerType sampler) {
3268   DCHECK_GE(precision, 0);
3269   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3270   DCHECK_GE(sampler, 0);
3271   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3272   TileProgramSwizzle* program = &tile_program_swizzle_[precision][sampler];
3273   if (!program->initialized()) {
3274     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzle::initialize");
3275     program->Initialize(
3276         output_surface_->context_provider(), precision, sampler);
3277   }
3278   return program;
3279 }
3280
3281 const GLRenderer::TileProgramSwizzleOpaque*
3282 GLRenderer::GetTileProgramSwizzleOpaque(TexCoordPrecision precision,
3283                                         SamplerType sampler) {
3284   DCHECK_GE(precision, 0);
3285   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3286   DCHECK_GE(sampler, 0);
3287   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3288   TileProgramSwizzleOpaque* program =
3289       &tile_program_swizzle_opaque_[precision][sampler];
3290   if (!program->initialized()) {
3291     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleOpaque::initialize");
3292     program->Initialize(
3293         output_surface_->context_provider(), precision, sampler);
3294   }
3295   return program;
3296 }
3297
3298 const GLRenderer::TileProgramSwizzleAA* GLRenderer::GetTileProgramSwizzleAA(
3299     TexCoordPrecision precision,
3300     SamplerType sampler) {
3301   DCHECK_GE(precision, 0);
3302   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3303   DCHECK_GE(sampler, 0);
3304   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3305   TileProgramSwizzleAA* program = &tile_program_swizzle_aa_[precision][sampler];
3306   if (!program->initialized()) {
3307     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleAA::initialize");
3308     program->Initialize(
3309         output_surface_->context_provider(), precision, sampler);
3310   }
3311   return program;
3312 }
3313
3314 const GLRenderer::TextureProgram* GLRenderer::GetTextureProgram(
3315     TexCoordPrecision precision,
3316     SamplerType sampler) {
3317   DCHECK_GE(precision, 0);
3318   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3319   DCHECK_GE(sampler, 0);
3320   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3321   TextureProgram* program = &texture_program_[precision][sampler];
3322   if (!program->initialized()) {
3323     TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
3324     program->Initialize(output_surface_->context_provider(), precision,
3325                         sampler);
3326   }
3327   return program;
3328 }
3329
3330 const GLRenderer::NonPremultipliedTextureProgram*
3331 GLRenderer::GetNonPremultipliedTextureProgram(TexCoordPrecision precision,
3332                                               SamplerType sampler) {
3333   DCHECK_GE(precision, 0);
3334   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3335   DCHECK_GE(sampler, 0);
3336   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3337   NonPremultipliedTextureProgram* program =
3338       &nonpremultiplied_texture_program_[precision][sampler];
3339   if (!program->initialized()) {
3340     TRACE_EVENT0("cc",
3341                  "GLRenderer::NonPremultipliedTextureProgram::Initialize");
3342     program->Initialize(output_surface_->context_provider(), precision,
3343                         sampler);
3344   }
3345   return program;
3346 }
3347
3348 const GLRenderer::TextureBackgroundProgram*
3349 GLRenderer::GetTextureBackgroundProgram(TexCoordPrecision precision,
3350                                         SamplerType sampler) {
3351   DCHECK_GE(precision, 0);
3352   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3353   DCHECK_GE(sampler, 0);
3354   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3355   TextureBackgroundProgram* program =
3356       &texture_background_program_[precision][sampler];
3357   if (!program->initialized()) {
3358     TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
3359     program->Initialize(output_surface_->context_provider(), precision,
3360                         sampler);
3361   }
3362   return program;
3363 }
3364
3365 const GLRenderer::NonPremultipliedTextureBackgroundProgram*
3366 GLRenderer::GetNonPremultipliedTextureBackgroundProgram(
3367     TexCoordPrecision precision,
3368     SamplerType sampler) {
3369   DCHECK_GE(precision, 0);
3370   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3371   DCHECK_GE(sampler, 0);
3372   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3373   NonPremultipliedTextureBackgroundProgram* program =
3374       &nonpremultiplied_texture_background_program_[precision][sampler];
3375   if (!program->initialized()) {
3376     TRACE_EVENT0("cc",
3377                  "GLRenderer::NonPremultipliedTextureProgram::Initialize");
3378     program->Initialize(output_surface_->context_provider(), precision,
3379                         sampler);
3380   }
3381   return program;
3382 }
3383
3384 const GLRenderer::TextureProgram* GLRenderer::GetTextureIOSurfaceProgram(
3385     TexCoordPrecision precision) {
3386   DCHECK_GE(precision, 0);
3387   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3388   TextureProgram* program = &texture_io_surface_program_[precision];
3389   if (!program->initialized()) {
3390     TRACE_EVENT0("cc", "GLRenderer::textureIOSurfaceProgram::initialize");
3391     program->Initialize(output_surface_->context_provider(), precision,
3392                         SAMPLER_TYPE_2D_RECT);
3393   }
3394   return program;
3395 }
3396
3397 const GLRenderer::VideoYUVProgram* GLRenderer::GetVideoYUVProgram(
3398     TexCoordPrecision precision,
3399     SamplerType sampler) {
3400   DCHECK_GE(precision, 0);
3401   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3402   DCHECK_GE(sampler, 0);
3403   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3404   VideoYUVProgram* program = &video_yuv_program_[precision][sampler];
3405   if (!program->initialized()) {
3406     TRACE_EVENT0("cc", "GLRenderer::videoYUVProgram::initialize");
3407     program->Initialize(output_surface_->context_provider(), precision,
3408                         sampler);
3409   }
3410   return program;
3411 }
3412
3413 const GLRenderer::VideoYUVAProgram* GLRenderer::GetVideoYUVAProgram(
3414     TexCoordPrecision precision,
3415     SamplerType sampler) {
3416   DCHECK_GE(precision, 0);
3417   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3418   DCHECK_GE(sampler, 0);
3419   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3420   VideoYUVAProgram* program = &video_yuva_program_[precision][sampler];
3421   if (!program->initialized()) {
3422     TRACE_EVENT0("cc", "GLRenderer::videoYUVAProgram::initialize");
3423     program->Initialize(output_surface_->context_provider(), precision,
3424                         sampler);
3425   }
3426   return program;
3427 }
3428
3429 const GLRenderer::VideoStreamTextureProgram*
3430 GLRenderer::GetVideoStreamTextureProgram(TexCoordPrecision precision) {
3431   if (!Capabilities().using_egl_image)
3432     return NULL;
3433   DCHECK_GE(precision, 0);
3434   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3435   VideoStreamTextureProgram* program =
3436       &video_stream_texture_program_[precision];
3437   if (!program->initialized()) {
3438     TRACE_EVENT0("cc", "GLRenderer::streamTextureProgram::initialize");
3439     program->Initialize(output_surface_->context_provider(), precision,
3440                         SAMPLER_TYPE_EXTERNAL_OES);
3441   }
3442   return program;
3443 }
3444
3445 void GLRenderer::CleanupSharedObjects() {
3446   shared_geometry_ = nullptr;
3447
3448   for (int i = 0; i <= LAST_TEX_COORD_PRECISION; ++i) {
3449     for (int j = 0; j <= LAST_SAMPLER_TYPE; ++j) {
3450       tile_program_[i][j].Cleanup(gl_);
3451       tile_program_opaque_[i][j].Cleanup(gl_);
3452       tile_program_swizzle_[i][j].Cleanup(gl_);
3453       tile_program_swizzle_opaque_[i][j].Cleanup(gl_);
3454       tile_program_aa_[i][j].Cleanup(gl_);
3455       tile_program_swizzle_aa_[i][j].Cleanup(gl_);
3456
3457       for (int k = 0; k <= LAST_BLEND_MODE; k++) {
3458         for (int l = 0; l <= LAST_MASK_VALUE; ++l) {
3459           render_pass_mask_program_[i][j][k][l].Cleanup(gl_);
3460           render_pass_mask_program_aa_[i][j][k][l].Cleanup(gl_);
3461           render_pass_mask_color_matrix_program_aa_[i][j][k][l].Cleanup(gl_);
3462           render_pass_mask_color_matrix_program_[i][j][k][l].Cleanup(gl_);
3463         }
3464       }
3465
3466       video_yuv_program_[i][j].Cleanup(gl_);
3467       video_yuva_program_[i][j].Cleanup(gl_);
3468     }
3469     for (int j = 0; j <= LAST_BLEND_MODE; j++) {
3470       render_pass_program_[i][j].Cleanup(gl_);
3471       render_pass_program_aa_[i][j].Cleanup(gl_);
3472       render_pass_color_matrix_program_[i][j].Cleanup(gl_);
3473       render_pass_color_matrix_program_aa_[i][j].Cleanup(gl_);
3474     }
3475
3476     for (int j = 0; j <= LAST_SAMPLER_TYPE; ++j) {
3477       texture_program_[i][j].Cleanup(gl_);
3478       nonpremultiplied_texture_program_[i][j].Cleanup(gl_);
3479       texture_background_program_[i][j].Cleanup(gl_);
3480       nonpremultiplied_texture_background_program_[i][j].Cleanup(gl_);
3481     }
3482     texture_io_surface_program_[i].Cleanup(gl_);
3483
3484     video_stream_texture_program_[i].Cleanup(gl_);
3485   }
3486
3487   tile_checkerboard_program_.Cleanup(gl_);
3488
3489   debug_border_program_.Cleanup(gl_);
3490   solid_color_program_.Cleanup(gl_);
3491   solid_color_program_aa_.Cleanup(gl_);
3492
3493   if (offscreen_framebuffer_id_)
3494     gl_->DeleteFramebuffers(1, &offscreen_framebuffer_id_);
3495
3496   if (on_demand_tile_raster_resource_id_)
3497     resource_provider_->DeleteResource(on_demand_tile_raster_resource_id_);
3498
3499   ReleaseRenderPassTextures();
3500 }
3501
3502 void GLRenderer::ReinitializeGLState() {
3503   is_scissor_enabled_ = false;
3504   scissor_rect_needs_reset_ = true;
3505   stencil_shadow_ = false;
3506   blend_shadow_ = true;
3507   program_shadow_ = 0;
3508
3509   RestoreGLState();
3510 }
3511
3512 void GLRenderer::RestoreGLState() {
3513   // This restores the current GLRenderer state to the GL context.
3514   bound_geometry_ = NO_BINDING;
3515   PrepareGeometry(SHARED_BINDING);
3516
3517   gl_->Disable(GL_DEPTH_TEST);
3518   gl_->Disable(GL_CULL_FACE);
3519   gl_->ColorMask(true, true, true, true);
3520   gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
3521   gl_->ActiveTexture(GL_TEXTURE0);
3522
3523   if (program_shadow_)
3524     gl_->UseProgram(program_shadow_);
3525
3526   if (stencil_shadow_)
3527     gl_->Enable(GL_STENCIL_TEST);
3528   else
3529     gl_->Disable(GL_STENCIL_TEST);
3530
3531   if (blend_shadow_)
3532     gl_->Enable(GL_BLEND);
3533   else
3534     gl_->Disable(GL_BLEND);
3535
3536   if (is_scissor_enabled_) {
3537     gl_->Enable(GL_SCISSOR_TEST);
3538     gl_->Scissor(scissor_rect_.x(), scissor_rect_.y(), scissor_rect_.width(),
3539                  scissor_rect_.height());
3540   } else {
3541     gl_->Disable(GL_SCISSOR_TEST);
3542   }
3543 }
3544
3545 void GLRenderer::RestoreFramebuffer(DrawingFrame* frame) {
3546   UseRenderPass(frame, frame->current_render_pass);
3547
3548   // Call SetViewport directly, rather than through PrepareSurfaceForPass.
3549   // PrepareSurfaceForPass also clears the surface, which is not desired when
3550   // restoring.
3551   SetViewport();
3552 }
3553
3554 bool GLRenderer::IsContextLost() {
3555   return gl_->GetGraphicsResetStatusKHR() != GL_NO_ERROR;
3556 }
3557
3558 void GLRenderer::ScheduleOverlays(DrawingFrame* frame) {
3559   if (!frame->overlay_list.size())
3560     return;
3561
3562   ResourceProvider::ResourceIdArray resources;
3563   OverlayCandidateList& overlays = frame->overlay_list;
3564   for (const OverlayCandidate& overlay : overlays) {
3565     // Skip primary plane.
3566     if (overlay.plane_z_order == 0)
3567       continue;
3568
3569     pending_overlay_resources_.push_back(
3570         make_scoped_ptr(new ResourceProvider::ScopedReadLockGL(
3571             resource_provider_, overlay.resource_id)));
3572
3573     context_support_->ScheduleOverlayPlane(
3574         overlay.plane_z_order,
3575         overlay.transform,
3576         pending_overlay_resources_.back()->texture_id(),
3577         ToNearestRect(overlay.display_rect),
3578         overlay.uv_rect);
3579   }
3580 }
3581
3582 }  // namespace cc