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::DEBUG_BORDER:
 522       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 523       break;
 524     case DrawQuad::IO_SURFACE_CONTENT:
 525       DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad),
 526                         clip_region);
 527       break;
 528     case DrawQuad::PICTURE_CONTENT:
 529       // PictureDrawQuad should only be used for resourceless software draws.
 530       NOTREACHED();
 531       break;
 532     case DrawQuad::RENDER_PASS:
 533       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad),
 534                          clip_region);
 535       break;
 536     case DrawQuad::SOLID_COLOR:
 537       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad),
 538                          clip_region);
 539       break;
 540     case DrawQuad::STREAM_VIDEO_CONTENT:
 541       DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad),
 542                           clip_region);
 543       break;
 544     case DrawQuad::SURFACE_CONTENT:
 545       // Surface content should be fully resolved to other quad types before
 546       // reaching a direct renderer.
 547       NOTREACHED();
 548       break;
 549     case DrawQuad::TEXTURE_CONTENT:
 550       EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad),
 551                          clip_region);
 552       break;
 553     case DrawQuad::TILED_CONTENT:
 554       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad), clip_region);
 555       break;
 556     case DrawQuad::YUV_VIDEO_CONTENT:
 557       DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad),
 558                        clip_region);
 559       break;
 560   }
 561 }
 562
 563 // This function does not handle 3D sorting right now, since the debug border
 564 // quads are just drawn as their original quads and not in split pieces. This
 565 // results in some debug border quads drawing over foreground quads.
 566 void GLRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 567                                      const DebugBorderDrawQuad* quad) {
 568   SetBlendEnabled(quad->ShouldDrawWithBlending());
 569
 570   static float gl_matrix[16];
 571   const DebugBorderProgram* program = GetDebugBorderProgram();
 572   DCHECK(program && (program->initialized() || IsContextLost()));
 573   SetUseProgram(program->program());
 574
 575   // Use the full quad_rect for debug quads to not move the edges based on
 576   // partial swaps.
 577   gfx::Rect layer_rect = quad->rect;
 578   gfx::Transform render_matrix;
 579   QuadRectTransform(&render_matrix,
 580                     quad->shared_quad_state->quad_to_target_transform,
 581                     layer_rect);
 582   GLRenderer::ToGLMatrix(&gl_matrix[0],
 583                          frame->projection_matrix * render_matrix);
 584   gl_->UniformMatrix4fv(program->vertex_shader().matrix_location(), 1, false,
 585                         &gl_matrix[0]);
 586
 587   SkColor color = quad->color;
 588   float alpha = SkColorGetA(color) * (1.0f / 255.0f);
 589
 590   gl_->Uniform4f(program->fragment_shader().color_location(),
 591                  (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
 592                  (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
 593                  (SkColorGetB(color) * (1.0f / 255.0f)) * alpha, alpha);
 594
 595   gl_->LineWidth(quad->width);
 596
 597   // The indices for the line are stored in the same array as the triangle
 598   // indices.
 599   gl_->DrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, 0);
 600 }
 601
 602 static skia::RefPtr<SkImage> ApplyImageFilter(
 603     scoped_ptr<GLRenderer::ScopedUseGrContext> use_gr_context,
 604     ResourceProvider* resource_provider,
 605     const gfx::Rect& rect,
 606     const gfx::Vector2dF& scale,
 607     SkImageFilter* filter,
 608     ScopedResource* source_texture_resource) {
 609   if (!filter)
 610     return skia::RefPtr<SkImage>();
 611
 612   if (!use_gr_context)
 613     return skia::RefPtr<SkImage>();
 614
 615   ResourceProvider::ScopedReadLockGL lock(resource_provider,
 616                                           source_texture_resource->id());
 617
 618   // Wrap the source texture in a Ganesh platform texture.
 619   GrBackendTextureDesc backend_texture_description;
 620   backend_texture_description.fWidth = source_texture_resource->size().width();
 621   backend_texture_description.fHeight =
 622       source_texture_resource->size().height();
 623   backend_texture_description.fConfig = kSkia8888_GrPixelConfig;
 624   backend_texture_description.fTextureHandle = lock.texture_id();
 625   backend_texture_description.fOrigin = kBottomLeft_GrSurfaceOrigin;
 626   skia::RefPtr<GrTexture> texture = skia::AdoptRef(
 627       use_gr_context->context()->textureProvider()->wrapBackendTexture(
 628           backend_texture_description));
 629   if (!texture) {
 630     TRACE_EVENT_INSTANT0("cc",
 631                          "ApplyImageFilter wrap background texture failed",
 632                          TRACE_EVENT_SCOPE_THREAD);
 633     return skia::RefPtr<SkImage>();
 634   }
 635
 636   SkImageInfo src_info =
 637       SkImageInfo::MakeN32Premul(source_texture_resource->size().width(),
 638                                  source_texture_resource->size().height());
 639   // Place the platform texture inside an SkBitmap.
 640   SkBitmap source;
 641   source.setInfo(src_info);
 642   skia::RefPtr<SkGrPixelRef> pixel_ref =
 643       skia::AdoptRef(new SkGrPixelRef(src_info, texture.get()));
 644   source.setPixelRef(pixel_ref.get());
 645
 646   // Create surface to draw into.
 647   SkImageInfo dst_info =
 648       SkImageInfo::MakeN32Premul(source.width(), source.height());
 649   skia::RefPtr<SkSurface> surface = skia::AdoptRef(SkSurface::NewRenderTarget(
 650       use_gr_context->context(), SkSurface::kYes_Budgeted, dst_info, 0));
 651   if (!surface) {
 652     TRACE_EVENT_INSTANT0("cc", "ApplyImageFilter surface allocation failed",
 653                          TRACE_EVENT_SCOPE_THREAD);
 654     return skia::RefPtr<SkImage>();
 655   }
 656   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
 657
 658   // Draw the source bitmap through the filter to the canvas.
 659   SkPaint paint;
 660   paint.setImageFilter(filter);
 661   canvas->clear(SK_ColorTRANSPARENT);
 662
 663   // The origin of the filter is top-left and the origin of the source is
 664   // bottom-left, but the orientation is the same, so we must translate the
 665   // filter so that it renders at the bottom of the texture to avoid
 666   // misregistration.
 667   int y_translate = source.height() - rect.height() - rect.origin().y();
 668   canvas->translate(-rect.origin().x(), y_translate);
 669   canvas->scale(scale.x(), scale.y());
 670   canvas->drawSprite(source, 0, 0, &paint);
 671
 672   skia::RefPtr<SkImage> image = skia::AdoptRef(surface->newImageSnapshot());
 673   if (!image || !image->isTextureBacked()) {
 674     return skia::RefPtr<SkImage>();
 675   }
 676
 677   return image;
 678 }
 679
 680 bool GLRenderer::CanApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
 681   return use_blend_equation_advanced_ ||
 682          blend_mode == SkXfermode::kScreen_Mode ||
 683          blend_mode == SkXfermode::kSrcOver_Mode;
 684 }
 685
 686 void GLRenderer::ApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
 687   DCHECK(CanApplyBlendModeUsingBlendFunc(blend_mode));
 688
 689   // Any modes set here must be reset in RestoreBlendFuncToDefault
 690   if (use_blend_equation_advanced_) {
 691     GLenum equation = GL_FUNC_ADD;
 692
 693     switch (blend_mode) {
 694       case SkXfermode::kScreen_Mode:
 695         equation = GL_SCREEN_KHR;
 696         break;
 697       case SkXfermode::kOverlay_Mode:
 698         equation = GL_OVERLAY_KHR;
 699         break;
 700       case SkXfermode::kDarken_Mode:
 701         equation = GL_DARKEN_KHR;
 702         break;
 703       case SkXfermode::kLighten_Mode:
 704         equation = GL_LIGHTEN_KHR;
 705         break;
 706       case SkXfermode::kColorDodge_Mode:
 707         equation = GL_COLORDODGE_KHR;
 708         break;
 709       case SkXfermode::kColorBurn_Mode:
 710         equation = GL_COLORBURN_KHR;
 711         break;
 712       case SkXfermode::kHardLight_Mode:
 713         equation = GL_HARDLIGHT_KHR;
 714         break;
 715       case SkXfermode::kSoftLight_Mode:
 716         equation = GL_SOFTLIGHT_KHR;
 717         break;
 718       case SkXfermode::kDifference_Mode:
 719         equation = GL_DIFFERENCE_KHR;
 720         break;
 721       case SkXfermode::kExclusion_Mode:
 722         equation = GL_EXCLUSION_KHR;
 723         break;
 724       case SkXfermode::kMultiply_Mode:
 725         equation = GL_MULTIPLY_KHR;
 726         break;
 727       case SkXfermode::kHue_Mode:
 728         equation = GL_HSL_HUE_KHR;
 729         break;
 730       case SkXfermode::kSaturation_Mode:
 731         equation = GL_HSL_SATURATION_KHR;
 732         break;
 733       case SkXfermode::kColor_Mode:
 734         equation = GL_HSL_COLOR_KHR;
 735         break;
 736       case SkXfermode::kLuminosity_Mode:
 737         equation = GL_HSL_LUMINOSITY_KHR;
 738         break;
 739       default:
 740         return;
 741     }
 742
 743     gl_->BlendEquation(equation);
 744   } else {
 745     if (blend_mode == SkXfermode::kScreen_Mode) {
 746       gl_->BlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ONE);
 747     }
 748   }
 749 }
 750
 751 void GLRenderer::RestoreBlendFuncToDefault(SkXfermode::Mode blend_mode) {
 752   if (blend_mode == SkXfermode::kSrcOver_Mode)
 753     return;
 754
 755   if (use_blend_equation_advanced_) {
 756     gl_->BlendEquation(GL_FUNC_ADD);
 757   } else {
 758     gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 759   }
 760 }
 761
 762 bool GLRenderer::ShouldApplyBackgroundFilters(const RenderPassDrawQuad* quad) {
 763   if (quad->background_filters.IsEmpty())
 764     return false;
 765
 766   // TODO(hendrikw): Look into allowing background filters to see pixels from
 767   // other render targets.  See crbug.com/314867.
 768
 769   return true;
 770 }
 771
 772 // This takes a gfx::Rect and a clip region quad in the same space,
 773 // and returns a quad with the same proportions in the space -0.5->0.5.
 774 bool GetScaledRegion(const gfx::Rect& rect,
 775                      const gfx::QuadF* clip,
 776                      gfx::QuadF* scaled_region) {
 777   if (!clip)
 778     return false;
 779
 780   gfx::PointF p1(((clip->p1().x() - rect.x()) / rect.width()) - 0.5f,
 781                  ((clip->p1().y() - rect.y()) / rect.height()) - 0.5f);
 782   gfx::PointF p2(((clip->p2().x() - rect.x()) / rect.width()) - 0.5f,
 783                  ((clip->p2().y() - rect.y()) / rect.height()) - 0.5f);
 784   gfx::PointF p3(((clip->p3().x() - rect.x()) / rect.width()) - 0.5f,
 785                  ((clip->p3().y() - rect.y()) / rect.height()) - 0.5f);
 786   gfx::PointF p4(((clip->p4().x() - rect.x()) / rect.width()) - 0.5f,
 787                  ((clip->p4().y() - rect.y()) / rect.height()) - 0.5f);
 788   *scaled_region = gfx::QuadF(p1, p2, p3, p4);
 789   return true;
 790 }
 791
 792 // This takes a gfx::Rect and a clip region quad in the same space,
 793 // and returns the proportional uv's in the space 0->1.
 794 bool GetScaledUVs(const gfx::Rect& rect, const gfx::QuadF* clip, float uvs[8]) {
 795   if (!clip)
 796     return false;
 797
 798   uvs[0] = ((clip->p1().x() - rect.x()) / rect.width());
 799   uvs[1] = ((clip->p1().y() - rect.y()) / rect.height());
 800   uvs[2] = ((clip->p2().x() - rect.x()) / rect.width());
 801   uvs[3] = ((clip->p2().y() - rect.y()) / rect.height());
 802   uvs[4] = ((clip->p3().x() - rect.x()) / rect.width());
 803   uvs[5] = ((clip->p3().y() - rect.y()) / rect.height());
 804   uvs[6] = ((clip->p4().x() - rect.x()) / rect.width());
 805   uvs[7] = ((clip->p4().y() - rect.y()) / rect.height());
 806   return true;
 807 }
 808
 809 gfx::Rect GLRenderer::GetBackdropBoundingBoxForRenderPassQuad(
 810     DrawingFrame* frame,
 811     const RenderPassDrawQuad* quad,
 812     const gfx::Transform& contents_device_transform,
 813     const gfx::QuadF* clip_region,
 814     bool use_aa) {
 815   gfx::QuadF scaled_region;
 816   if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
 817     scaled_region = SharedGeometryQuad().BoundingBox();
 818   }
 819
 820   gfx::Rect backdrop_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
 821       contents_device_transform, scaled_region.BoundingBox()));
 822
 823   if (ShouldApplyBackgroundFilters(quad)) {
 824     int top, right, bottom, left;
 825     quad->background_filters.GetOutsets(&top, &right, &bottom, &left);
 826     backdrop_rect.Inset(-left, -top, -right, -bottom);
 827   }
 828
 829   if (!backdrop_rect.IsEmpty() && use_aa) {
 830     const int kOutsetForAntialiasing = 1;
 831     backdrop_rect.Inset(-kOutsetForAntialiasing, -kOutsetForAntialiasing);
 832   }
 833
 834   backdrop_rect.Intersect(MoveFromDrawToWindowSpace(
 835       frame, frame->current_render_pass->output_rect));
 836   return backdrop_rect;
 837 }
 838
 839 scoped_ptr<ScopedResource> GLRenderer::GetBackdropTexture(
 840     const gfx::Rect& bounding_rect) {
 841   scoped_ptr<ScopedResource> device_background_texture =
 842       ScopedResource::Create(resource_provider_);
 843   // CopyTexImage2D fails when called on a texture having immutable storage.
 844   device_background_texture->Allocate(
 845       bounding_rect.size(), ResourceProvider::TEXTURE_HINT_DEFAULT, RGBA_8888);
 846   {
 847     ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
 848                                              device_background_texture->id());
 849     GetFramebufferTexture(
 850         lock.texture_id(), device_background_texture->format(), bounding_rect);
 851   }
 852   return device_background_texture.Pass();
 853 }
 854
 855 skia::RefPtr<SkImage> GLRenderer::ApplyBackgroundFilters(
 856     DrawingFrame* frame,
 857     const RenderPassDrawQuad* quad,
 858     ScopedResource* background_texture) {
 859   DCHECK(ShouldApplyBackgroundFilters(quad));
 860   skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 861       quad->background_filters, background_texture->size());
 862
 863   skia::RefPtr<SkImage> background_with_filters = ApplyImageFilter(
 864       ScopedUseGrContext::Create(this, frame), resource_provider_, quad->rect,
 865       quad->filters_scale, filter.get(), background_texture);
 866   return background_with_filters;
 867 }
 868
 869 void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
 870                                     const RenderPassDrawQuad* quad,
 871                                     const gfx::QuadF* clip_region) {
 872   ScopedResource* contents_texture =
 873       render_pass_textures_.get(quad->render_pass_id);
 874   DCHECK(contents_texture);
 875   DCHECK(contents_texture->id());
 876
 877   gfx::Transform quad_rect_matrix;
 878   QuadRectTransform(&quad_rect_matrix,
 879                     quad->shared_quad_state->quad_to_target_transform,
 880                     quad->rect);
 881   gfx::Transform contents_device_transform =
 882       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 883   contents_device_transform.FlattenTo2d();
 884
 885   // Can only draw surface if device matrix is invertible.
 886   if (!contents_device_transform.IsInvertible())
 887     return;
 888
 889   gfx::QuadF surface_quad = SharedGeometryQuad();
 890
 891   gfx::QuadF device_layer_quad;
 892   bool use_aa = false;
 893   if (settings_->allow_antialiasing) {
 894     bool clipped = false;
 895     device_layer_quad =
 896         MathUtil::MapQuad(contents_device_transform, surface_quad, &clipped);
 897     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped,
 898                                  settings_->force_antialiasing);
 899   }
 900
 901   float edge[24];
 902   const gfx::QuadF* aa_quad = use_aa ? &device_layer_quad : nullptr;
 903   SetupRenderPassQuadForClippingAndAntialiasing(contents_device_transform, quad,
 904                                                 aa_quad, clip_region,
 905                                                 &surface_quad, edge);
 906   SkXfermode::Mode blend_mode = quad->shared_quad_state->blend_mode;
 907   bool use_shaders_for_blending =
 908       !CanApplyBlendModeUsingBlendFunc(blend_mode) ||
 909       ShouldApplyBackgroundFilters(quad) ||
 910       settings_->force_blending_with_shaders;
 911
 912   scoped_ptr<ScopedResource> background_texture;
 913   skia::RefPtr<SkImage> background_image;
 914   GLuint background_image_id = 0;
 915   gfx::Rect background_rect;
 916   if (use_shaders_for_blending) {
 917     // Compute a bounding box around the pixels that will be visible through
 918     // the quad.
 919     background_rect = GetBackdropBoundingBoxForRenderPassQuad(
 920         frame, quad, contents_device_transform, clip_region, use_aa);
 921
 922     if (!background_rect.IsEmpty()) {
 923       // The pixels from the filtered background should completely replace the
 924       // current pixel values.
 925       if (blend_enabled())
 926         SetBlendEnabled(false);
 927
 928       // Read the pixels in the bounding box into a buffer R.
 929       // This function allocates a texture, which should contribute to the
 930       // amount of memory used by render surfaces:
 931       // LayerTreeHost::CalculateMemoryForRenderSurfaces.
 932       background_texture = GetBackdropTexture(background_rect);
 933
 934       if (ShouldApplyBackgroundFilters(quad) && background_texture) {
 935         // Apply the background filters to R, so that it is applied in the
 936         // pixels' coordinate space.
 937         background_image =
 938             ApplyBackgroundFilters(frame, quad, background_texture.get());
 939         if (background_image)
 940           background_image_id = background_image->getTextureHandle(true);
 941         DCHECK(background_image_id);
 942       }
 943     }
 944
 945     if (!background_texture) {
 946       // Something went wrong with reading the backdrop.
 947       DCHECK(!background_image_id);
 948       use_shaders_for_blending = false;
 949     } else if (background_image_id) {
 950       // Reset original background texture if there is not any mask
 951       if (!quad->mask_resource_id())
 952         background_texture.reset();
 953     } else if (CanApplyBlendModeUsingBlendFunc(blend_mode) &&
 954                ShouldApplyBackgroundFilters(quad)) {
 955       // Something went wrong with applying background filters to the backdrop.
 956       use_shaders_for_blending = false;
 957       background_texture.reset();
 958     }
 959   }
 960   // Need original background texture for mask?
 961   bool mask_for_background =
 962       background_texture &&      // Have original background texture
 963       background_image_id &&     // Have filtered background texture
 964       quad->mask_resource_id();  // Have mask texture
 965   SetBlendEnabled(
 966       !use_shaders_for_blending &&
 967       (quad->ShouldDrawWithBlending() || !IsDefaultBlendMode(blend_mode)));
 968
 969   // TODO(senorblanco): Cache this value so that we don't have to do it for both
 970   // the surface and its replica.  Apply filters to the contents texture.
 971   skia::RefPtr<SkImage> filter_image;
 972   GLuint filter_image_id = 0;
 973   SkScalar color_matrix[20];
 974   bool use_color_matrix = false;
 975   if (!quad->filters.IsEmpty()) {
 976     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 977         quad->filters, contents_texture->size());
 978     if (filter) {
 979       skia::RefPtr<SkColorFilter> cf;
 980
 981       {
 982         SkColorFilter* colorfilter_rawptr = NULL;
 983         filter->asColorFilter(&colorfilter_rawptr);
 984         cf = skia::AdoptRef(colorfilter_rawptr);
 985       }
 986
 987       if (cf && cf->asColorMatrix(color_matrix) && !filter->getInput(0)) {
 988         // We have a single color matrix as a filter; apply it locally
 989         // in the compositor.
 990         use_color_matrix = true;
 991       } else {
 992         filter_image = ApplyImageFilter(
 993             ScopedUseGrContext::Create(this, frame), resource_provider_,
 994             quad->rect, quad->filters_scale, filter.get(), contents_texture);
 995         if (filter_image) {
 996           filter_image_id = filter_image->getTextureHandle(true);
 997           DCHECK(filter_image_id);
 998         }
 999       }
1000     }
1001   }
1002
1003   scoped_ptr<ResourceProvider::ScopedSamplerGL> mask_resource_lock;
1004   unsigned mask_texture_id = 0;
1005   SamplerType mask_sampler = SAMPLER_TYPE_NA;
1006   if (quad->mask_resource_id()) {
1007     mask_resource_lock.reset(new ResourceProvider::ScopedSamplerGL(
1008         resource_provider_, quad->mask_resource_id(), GL_TEXTURE1, GL_LINEAR));
1009     mask_texture_id = mask_resource_lock->texture_id();
1010     mask_sampler = SamplerTypeFromTextureTarget(mask_resource_lock->target());
1011   }
1012
1013   scoped_ptr<ResourceProvider::ScopedSamplerGL> contents_resource_lock;
1014   if (filter_image_id) {
1015     DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
1016     gl_->BindTexture(GL_TEXTURE_2D, filter_image_id);
1017   } else {
1018     contents_resource_lock =
1019         make_scoped_ptr(new ResourceProvider::ScopedSamplerGL(
1020             resource_provider_, contents_texture->id(), GL_LINEAR));
1021     DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
1022               contents_resource_lock->target());
1023   }
1024
1025   if (!use_shaders_for_blending) {
1026     if (!use_blend_equation_advanced_coherent_ && use_blend_equation_advanced_)
1027       gl_->BlendBarrierKHR();
1028
1029     ApplyBlendModeUsingBlendFunc(blend_mode);
1030   }
1031
1032   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1033       gl_, &highp_threshold_cache_, highp_threshold_min_,
1034       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
1035
1036   ShaderLocations locations;
1037
1038   DCHECK_EQ(background_texture || background_image_id,
1039             use_shaders_for_blending);
1040   BlendMode shader_blend_mode = use_shaders_for_blending
1041                                     ? BlendModeFromSkXfermode(blend_mode)
1042                                     : BLEND_MODE_NONE;
1043
1044   if (use_aa && mask_texture_id && !use_color_matrix) {
1045     const RenderPassMaskProgramAA* program = GetRenderPassMaskProgramAA(
1046         tex_coord_precision, mask_sampler,
1047         shader_blend_mode, mask_for_background);
1048     SetUseProgram(program->program());
1049     program->vertex_shader().FillLocations(&locations);
1050     program->fragment_shader().FillLocations(&locations);
1051     gl_->Uniform1i(locations.sampler, 0);
1052   } else if (!use_aa && mask_texture_id && !use_color_matrix) {
1053     const RenderPassMaskProgram* program = GetRenderPassMaskProgram(
1054         tex_coord_precision, mask_sampler,
1055         shader_blend_mode, mask_for_background);
1056     SetUseProgram(program->program());
1057     program->vertex_shader().FillLocations(&locations);
1058     program->fragment_shader().FillLocations(&locations);
1059     gl_->Uniform1i(locations.sampler, 0);
1060   } else if (use_aa && !mask_texture_id && !use_color_matrix) {
1061     const RenderPassProgramAA* program =
1062         GetRenderPassProgramAA(tex_coord_precision, shader_blend_mode);
1063     SetUseProgram(program->program());
1064     program->vertex_shader().FillLocations(&locations);
1065     program->fragment_shader().FillLocations(&locations);
1066     gl_->Uniform1i(locations.sampler, 0);
1067   } else if (use_aa && mask_texture_id && use_color_matrix) {
1068     const RenderPassMaskColorMatrixProgramAA* program =
1069         GetRenderPassMaskColorMatrixProgramAA(
1070             tex_coord_precision, mask_sampler,
1071             shader_blend_mode, mask_for_background);
1072     SetUseProgram(program->program());
1073     program->vertex_shader().FillLocations(&locations);
1074     program->fragment_shader().FillLocations(&locations);
1075     gl_->Uniform1i(locations.sampler, 0);
1076   } else if (use_aa && !mask_texture_id && use_color_matrix) {
1077     const RenderPassColorMatrixProgramAA* program =
1078         GetRenderPassColorMatrixProgramAA(tex_coord_precision,
1079                                           shader_blend_mode);
1080     SetUseProgram(program->program());
1081     program->vertex_shader().FillLocations(&locations);
1082     program->fragment_shader().FillLocations(&locations);
1083     gl_->Uniform1i(locations.sampler, 0);
1084   } else if (!use_aa && mask_texture_id && use_color_matrix) {
1085     const RenderPassMaskColorMatrixProgram* program =
1086         GetRenderPassMaskColorMatrixProgram(
1087             tex_coord_precision, mask_sampler,
1088             shader_blend_mode, mask_for_background);
1089     SetUseProgram(program->program());
1090     program->vertex_shader().FillLocations(&locations);
1091     program->fragment_shader().FillLocations(&locations);
1092     gl_->Uniform1i(locations.sampler, 0);
1093   } else if (!use_aa && !mask_texture_id && use_color_matrix) {
1094     const RenderPassColorMatrixProgram* program =
1095         GetRenderPassColorMatrixProgram(tex_coord_precision, shader_blend_mode);
1096     SetUseProgram(program->program());
1097     program->vertex_shader().FillLocations(&locations);
1098     program->fragment_shader().FillLocations(&locations);
1099     gl_->Uniform1i(locations.sampler, 0);
1100   } else {
1101     const RenderPassProgram* program =
1102         GetRenderPassProgram(tex_coord_precision, shader_blend_mode);
1103     SetUseProgram(program->program());
1104     program->vertex_shader().FillLocations(&locations);
1105     program->fragment_shader().FillLocations(&locations);
1106     gl_->Uniform1i(locations.sampler, 0);
1107   }
1108   float tex_scale_x =
1109       quad->rect.width() / static_cast<float>(contents_texture->size().width());
1110   float tex_scale_y = quad->rect.height() /
1111                       static_cast<float>(contents_texture->size().height());
1112   DCHECK_LE(tex_scale_x, 1.0f);
1113   DCHECK_LE(tex_scale_y, 1.0f);
1114
1115   DCHECK(locations.tex_transform != -1 || IsContextLost());
1116   // Flip the content vertically in the shader, as the RenderPass input
1117   // texture is already oriented the same way as the framebuffer, but the
1118   // projection transform does a flip.
1119   gl_->Uniform4f(locations.tex_transform, 0.0f, tex_scale_y, tex_scale_x,
1120                  -tex_scale_y);
1121
1122   GLint last_texture_unit = 0;
1123   if (locations.mask_sampler != -1) {
1124     DCHECK_NE(locations.mask_tex_coord_scale, 1);
1125     DCHECK_NE(locations.mask_tex_coord_offset, 1);
1126     gl_->Uniform1i(locations.mask_sampler, 1);
1127
1128     gfx::RectF mask_uv_rect = quad->MaskUVRect();
1129     if (mask_sampler != SAMPLER_TYPE_2D) {
1130       mask_uv_rect.Scale(quad->mask_texture_size.width(),
1131                          quad->mask_texture_size.height());
1132     }
1133
1134     // Mask textures are oriented vertically flipped relative to the framebuffer
1135     // and the RenderPass contents texture, so we flip the tex coords from the
1136     // RenderPass texture to find the mask texture coords.
1137     gl_->Uniform2f(locations.mask_tex_coord_offset, mask_uv_rect.x(),
1138                    mask_uv_rect.bottom());
1139     gl_->Uniform2f(locations.mask_tex_coord_scale,
1140                    mask_uv_rect.width() / tex_scale_x,
1141                    -mask_uv_rect.height() / tex_scale_y);
1142
1143     last_texture_unit = 1;
1144   }
1145
1146   if (locations.edge != -1)
1147     gl_->Uniform3fv(locations.edge, 8, edge);
1148
1149   if (locations.viewport != -1) {
1150     float viewport[4] = {
1151         static_cast<float>(current_window_space_viewport_.x()),
1152         static_cast<float>(current_window_space_viewport_.y()),
1153         static_cast<float>(current_window_space_viewport_.width()),
1154         static_cast<float>(current_window_space_viewport_.height()),
1155     };
1156     gl_->Uniform4fv(locations.viewport, 1, viewport);
1157   }
1158
1159   if (locations.color_matrix != -1) {
1160     float matrix[16];
1161     for (int i = 0; i < 4; ++i) {
1162       for (int j = 0; j < 4; ++j)
1163         matrix[i * 4 + j] = SkScalarToFloat(color_matrix[j * 5 + i]);
1164     }
1165     gl_->UniformMatrix4fv(locations.color_matrix, 1, false, matrix);
1166   }
1167   static const float kScale = 1.0f / 255.0f;
1168   if (locations.color_offset != -1) {
1169     float offset[4];
1170     for (int i = 0; i < 4; ++i)
1171       offset[i] = SkScalarToFloat(color_matrix[i * 5 + 4]) * kScale;
1172
1173     gl_->Uniform4fv(locations.color_offset, 1, offset);
1174   }
1175
1176   scoped_ptr<ResourceProvider::ScopedSamplerGL> shader_background_sampler_lock;
1177   if (locations.backdrop != -1) {
1178     DCHECK(background_texture || background_image_id);
1179     DCHECK_NE(locations.backdrop, 0);
1180     DCHECK_NE(locations.backdrop_rect, 0);
1181
1182     gl_->Uniform1i(locations.backdrop, ++last_texture_unit);
1183
1184     gl_->Uniform4f(locations.backdrop_rect, background_rect.x(),
1185                    background_rect.y(), background_rect.width(),
1186                    background_rect.height());
1187
1188     if (background_image_id) {
1189       gl_->ActiveTexture(GL_TEXTURE0 + last_texture_unit);
1190       gl_->BindTexture(GL_TEXTURE_2D, background_image_id);
1191       gl_->ActiveTexture(GL_TEXTURE0);
1192       if (mask_for_background)
1193         gl_->Uniform1i(locations.original_backdrop, ++last_texture_unit);
1194     }
1195     if (background_texture) {
1196       shader_background_sampler_lock = make_scoped_ptr(
1197           new ResourceProvider::ScopedSamplerGL(resource_provider_,
1198                                                 background_texture->id(),
1199                                                 GL_TEXTURE0 + last_texture_unit,
1200                                                 GL_LINEAR));
1201       DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
1202                 shader_background_sampler_lock->target());
1203     }
1204   }
1205
1206   SetShaderOpacity(quad->shared_quad_state->opacity, locations.alpha);
1207   SetShaderQuadF(surface_quad, locations.quad);
1208   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1209                    quad->rect, locations.matrix);
1210
1211   // Flush the compositor context before the filter bitmap goes out of
1212   // scope, so the draw gets processed before the filter texture gets deleted.
1213   if (filter_image_id)
1214     gl_->Flush();
1215
1216   if (!use_shaders_for_blending)
1217     RestoreBlendFuncToDefault(blend_mode);
1218 }
1219
1220 struct SolidColorProgramUniforms {
1221   unsigned program;
1222   unsigned matrix_location;
1223   unsigned viewport_location;
1224   unsigned quad_location;
1225   unsigned edge_location;
1226   unsigned color_location;
1227 };
1228
1229 template <class T>
1230 static void SolidColorUniformLocation(T program,
1231                                       SolidColorProgramUniforms* uniforms) {
1232   uniforms->program = program->program();
1233   uniforms->matrix_location = program->vertex_shader().matrix_location();
1234   uniforms->viewport_location = program->vertex_shader().viewport_location();
1235   uniforms->quad_location = program->vertex_shader().quad_location();
1236   uniforms->edge_location = program->vertex_shader().edge_location();
1237   uniforms->color_location = program->fragment_shader().color_location();
1238 }
1239
1240 namespace {
1241 // These functions determine if a quad, clipped by a clip_region contains
1242 // the entire {top|bottom|left|right} edge.
1243 bool is_top(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1244   if (!quad->IsTopEdge())
1245     return false;
1246   if (!clip_region)
1247     return true;
1248
1249   return std::abs(clip_region->p1().y()) < kAntiAliasingEpsilon &&
1250          std::abs(clip_region->p2().y()) < kAntiAliasingEpsilon;
1251 }
1252
1253 bool is_bottom(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1254   if (!quad->IsBottomEdge())
1255     return false;
1256   if (!clip_region)
1257     return true;
1258
1259   return std::abs(clip_region->p3().y() -
1260                   quad->shared_quad_state->quad_layer_bounds.height()) <
1261              kAntiAliasingEpsilon &&
1262          std::abs(clip_region->p4().y() -
1263                   quad->shared_quad_state->quad_layer_bounds.height()) <
1264              kAntiAliasingEpsilon;
1265 }
1266
1267 bool is_left(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1268   if (!quad->IsLeftEdge())
1269     return false;
1270   if (!clip_region)
1271     return true;
1272
1273   return std::abs(clip_region->p1().x()) < kAntiAliasingEpsilon &&
1274          std::abs(clip_region->p4().x()) < kAntiAliasingEpsilon;
1275 }
1276
1277 bool is_right(const gfx::QuadF* clip_region, const DrawQuad* quad) {
1278   if (!quad->IsRightEdge())
1279     return false;
1280   if (!clip_region)
1281     return true;
1282
1283   return std::abs(clip_region->p2().x() -
1284                   quad->shared_quad_state->quad_layer_bounds.width()) <
1285              kAntiAliasingEpsilon &&
1286          std::abs(clip_region->p3().x() -
1287                   quad->shared_quad_state->quad_layer_bounds.width()) <
1288              kAntiAliasingEpsilon;
1289 }
1290 }  // anonymous namespace
1291
1292 static gfx::QuadF GetDeviceQuadWithAntialiasingOnExteriorEdges(
1293     const LayerQuad& device_layer_edges,
1294     const gfx::Transform& device_transform,
1295     const gfx::QuadF& tile_quad,
1296     const gfx::QuadF* clip_region,
1297     const DrawQuad* quad) {
1298   gfx::RectF tile_rect = quad->visible_rect;
1299
1300   gfx::PointF bottom_right = tile_quad.p3();
1301   gfx::PointF bottom_left = tile_quad.p4();
1302   gfx::PointF top_left = tile_quad.p1();
1303   gfx::PointF top_right = tile_quad.p2();
1304   bool clipped = false;
1305
1306   // Map points to device space. We ignore |clipped|, since the result of
1307   // |MapPoint()| still produces a valid point to draw the quad with. When
1308   // clipped, the point will be outside of the viewport. See crbug.com/416367.
1309   bottom_right = MathUtil::MapPoint(device_transform, bottom_right, &clipped);
1310   bottom_left = MathUtil::MapPoint(device_transform, bottom_left, &clipped);
1311   top_left = MathUtil::MapPoint(device_transform, top_left, &clipped);
1312   top_right = MathUtil::MapPoint(device_transform, top_right, &clipped);
1313
1314   LayerQuad::Edge bottom_edge(bottom_right, bottom_left);
1315   LayerQuad::Edge left_edge(bottom_left, top_left);
1316   LayerQuad::Edge top_edge(top_left, top_right);
1317   LayerQuad::Edge right_edge(top_right, bottom_right);
1318
1319   // Only apply anti-aliasing to edges not clipped by culling or scissoring.
1320   // If an edge is degenerate we do not want to replace it with a "proper" edge
1321   // as that will cause the quad to possibly expand is strange ways.
1322   if (!top_edge.degenerate() && is_top(clip_region, quad) &&
1323       tile_rect.y() == quad->rect.y()) {
1324     top_edge = device_layer_edges.top();
1325   }
1326   if (!left_edge.degenerate() && is_left(clip_region, quad) &&
1327       tile_rect.x() == quad->rect.x()) {
1328     left_edge = device_layer_edges.left();
1329   }
1330   if (!right_edge.degenerate() && is_right(clip_region, quad) &&
1331       tile_rect.right() == quad->rect.right()) {
1332     right_edge = device_layer_edges.right();
1333   }
1334   if (!bottom_edge.degenerate() && is_bottom(clip_region, quad) &&
1335       tile_rect.bottom() == quad->rect.bottom()) {
1336     bottom_edge = device_layer_edges.bottom();
1337   }
1338
1339   float sign = tile_quad.IsCounterClockwise() ? -1 : 1;
1340   bottom_edge.scale(sign);
1341   left_edge.scale(sign);
1342   top_edge.scale(sign);
1343   right_edge.scale(sign);
1344
1345   // Create device space quad.
1346   return LayerQuad(left_edge, top_edge, right_edge, bottom_edge).ToQuadF();
1347 }
1348
1349 float GetTotalQuadError(const gfx::QuadF* clipped_quad,
1350                         const gfx::QuadF* ideal_rect) {
1351   return (clipped_quad->p1() - ideal_rect->p1()).LengthSquared() +
1352          (clipped_quad->p2() - ideal_rect->p2()).LengthSquared() +
1353          (clipped_quad->p3() - ideal_rect->p3()).LengthSquared() +
1354          (clipped_quad->p4() - ideal_rect->p4()).LengthSquared();
1355 }
1356
1357 // Attempt to rotate the clipped quad until it lines up the most
1358 // correctly. This is necessary because we check the edges of this
1359 // quad against the expected left/right/top/bottom for anti-aliasing.
1360 void AlignQuadToBoundingBox(gfx::QuadF* clipped_quad) {
1361   gfx::QuadF bounding_quad = gfx::QuadF(clipped_quad->BoundingBox());
1362   gfx::QuadF best_rotation = *clipped_quad;
1363   float least_error_amount = GetTotalQuadError(clipped_quad, &bounding_quad);
1364   for (size_t i = 1; i < 4; ++i) {
1365     clipped_quad->Realign(1);
1366     float new_error = GetTotalQuadError(clipped_quad, &bounding_quad);
1367     if (new_error < least_error_amount) {
1368       least_error_amount = new_error;
1369       best_rotation = *clipped_quad;
1370     }
1371   }
1372   *clipped_quad = best_rotation;
1373 }
1374
1375 // Map device space quad to local space. Device_transform has no 3d
1376 // component since it was flattened, so we don't need to project.  We should
1377 // have already checked that the transform was uninvertible before this call.
1378 gfx::QuadF MapQuadToLocalSpace(const gfx::Transform& device_transform,
1379                                const gfx::QuadF& device_quad) {
1380   gfx::Transform inverse_device_transform(gfx::Transform::kSkipInitialization);
1381   DCHECK(device_transform.IsInvertible());
1382   bool did_invert = device_transform.GetInverse(&inverse_device_transform);
1383   DCHECK(did_invert);
1384   bool clipped = false;
1385   gfx::QuadF local_quad =
1386       MathUtil::MapQuad(inverse_device_transform, device_quad, &clipped);
1387   // We should not DCHECK(!clipped) here, because anti-aliasing inflation may
1388   // cause device_quad to become clipped. To our knowledge this scenario does
1389   // not need to be handled differently than the unclipped case.
1390   return local_quad;
1391 }
1392
1393 void InflateAntiAliasingDistances(const gfx::QuadF& quad,
1394                                   LayerQuad* device_layer_edges,
1395                                   float edge[24]) {
1396   DCHECK(!quad.BoundingBox().IsEmpty());
1397   LayerQuad device_layer_bounds(gfx::QuadF(quad.BoundingBox()));
1398
1399   device_layer_edges->InflateAntiAliasingDistance();
1400   device_layer_edges->ToFloatArray(edge);
1401
1402   device_layer_bounds.InflateAntiAliasingDistance();
1403   device_layer_bounds.ToFloatArray(&edge[12]);
1404 }
1405
1406 // static
1407 bool GLRenderer::ShouldAntialiasQuad(const gfx::QuadF& device_layer_quad,
1408                                      bool clipped,
1409                                      bool force_aa) {
1410   // AAing clipped quads is not supported by the code yet.
1411   if (clipped)
1412     return false;
1413   if (device_layer_quad.BoundingBox().IsEmpty())
1414     return false;
1415   if (force_aa)
1416     return true;
1417
1418   bool is_axis_aligned_in_target = device_layer_quad.IsRectilinear();
1419   bool is_nearest_rect_within_epsilon =
1420       is_axis_aligned_in_target &&
1421       gfx::IsNearestRectWithinDistance(device_layer_quad.BoundingBox(),
1422                                        kAntiAliasingEpsilon);
1423   return !is_nearest_rect_within_epsilon;
1424 }
1425
1426 // static
1427 void GLRenderer::SetupQuadForClippingAndAntialiasing(
1428     const gfx::Transform& device_transform,
1429     const DrawQuad* quad,
1430     const gfx::QuadF* aa_quad,
1431     const gfx::QuadF* clip_region,
1432     gfx::QuadF* local_quad,
1433     float edge[24]) {
1434   gfx::QuadF rotated_clip;
1435   const gfx::QuadF* local_clip_region = clip_region;
1436   if (local_clip_region) {
1437     rotated_clip = *clip_region;
1438     AlignQuadToBoundingBox(&rotated_clip);
1439     local_clip_region = &rotated_clip;
1440   }
1441
1442   if (!aa_quad) {
1443     if (local_clip_region)
1444       *local_quad = *local_clip_region;
1445     return;
1446   }
1447
1448   LayerQuad device_layer_edges(*aa_quad);
1449   InflateAntiAliasingDistances(*aa_quad, &device_layer_edges, edge);
1450
1451   // If we have a clip region then we are split, and therefore
1452   // by necessity, at least one of our edges is not an external
1453   // one.
1454   bool is_full_rect = quad->visible_rect == quad->rect;
1455
1456   bool region_contains_all_outside_edges =
1457       is_full_rect &&
1458       (is_top(local_clip_region, quad) && is_left(local_clip_region, quad) &&
1459        is_bottom(local_clip_region, quad) && is_right(local_clip_region, quad));
1460
1461   bool use_aa_on_all_four_edges =
1462       !local_clip_region && region_contains_all_outside_edges;
1463
1464   gfx::QuadF device_quad;
1465   if (use_aa_on_all_four_edges) {
1466     device_quad = device_layer_edges.ToQuadF();
1467   } else {
1468     gfx::QuadF tile_quad(local_clip_region ? *local_clip_region
1469                                            : gfx::QuadF(quad->visible_rect));
1470     device_quad = GetDeviceQuadWithAntialiasingOnExteriorEdges(
1471         device_layer_edges, device_transform, tile_quad, local_clip_region,
1472         quad);
1473   }
1474
1475   *local_quad = MapQuadToLocalSpace(device_transform, device_quad);
1476 }
1477
1478 // static
1479 void GLRenderer::SetupRenderPassQuadForClippingAndAntialiasing(
1480     const gfx::Transform& device_transform,
1481     const RenderPassDrawQuad* quad,
1482     const gfx::QuadF* aa_quad,
1483     const gfx::QuadF* clip_region,
1484     gfx::QuadF* local_quad,
1485     float edge[24]) {
1486   gfx::QuadF rotated_clip;
1487   const gfx::QuadF* local_clip_region = clip_region;
1488   if (local_clip_region) {
1489     rotated_clip = *clip_region;
1490     AlignQuadToBoundingBox(&rotated_clip);
1491     local_clip_region = &rotated_clip;
1492   }
1493
1494   if (!aa_quad) {
1495     GetScaledRegion(quad->rect, local_clip_region, local_quad);
1496     return;
1497   }
1498
1499   LayerQuad device_layer_edges(*aa_quad);
1500   InflateAntiAliasingDistances(*aa_quad, &device_layer_edges, edge);
1501
1502   gfx::QuadF device_quad;
1503
1504   // Apply anti-aliasing only to the edges that are not being clipped
1505   if (local_clip_region) {
1506     gfx::QuadF tile_quad(quad->visible_rect);
1507     GetScaledRegion(quad->rect, local_clip_region, &tile_quad);
1508     device_quad = GetDeviceQuadWithAntialiasingOnExteriorEdges(
1509         device_layer_edges, device_transform, tile_quad, local_clip_region,
1510         quad);
1511   } else {
1512     device_quad = device_layer_edges.ToQuadF();
1513   }
1514
1515   *local_quad = MapQuadToLocalSpace(device_transform, device_quad);
1516 }
1517
1518 void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
1519                                     const SolidColorDrawQuad* quad,
1520                                     const gfx::QuadF* clip_region) {
1521   gfx::Rect tile_rect = quad->visible_rect;
1522
1523   SkColor color = quad->color;
1524   float opacity = quad->shared_quad_state->opacity;
1525   float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
1526
1527   // Early out if alpha is small enough that quad doesn't contribute to output.
1528   if (alpha < std::numeric_limits<float>::epsilon() &&
1529       quad->ShouldDrawWithBlending())
1530     return;
1531
1532   gfx::Transform device_transform =
1533       frame->window_matrix * frame->projection_matrix *
1534       quad->shared_quad_state->quad_to_target_transform;
1535   device_transform.FlattenTo2d();
1536   if (!device_transform.IsInvertible())
1537     return;
1538
1539   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
1540
1541   gfx::QuadF device_layer_quad;
1542   bool use_aa = false;
1543   bool allow_aa = settings_->allow_antialiasing &&
1544                   !quad->force_anti_aliasing_off && quad->IsEdge();
1545
1546   if (allow_aa) {
1547     bool clipped = false;
1548     bool force_aa = false;
1549     device_layer_quad = MathUtil::MapQuad(
1550         device_transform,
1551         gfx::QuadF(quad->shared_quad_state->visible_quad_layer_rect), &clipped);
1552     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped, force_aa);
1553   }
1554
1555   float edge[24];
1556   const gfx::QuadF* aa_quad = use_aa ? &device_layer_quad : nullptr;
1557   SetupQuadForClippingAndAntialiasing(device_transform, quad, aa_quad,
1558                                       clip_region, &local_quad, edge);
1559
1560   SolidColorProgramUniforms uniforms;
1561   if (use_aa) {
1562     SolidColorUniformLocation(GetSolidColorProgramAA(), &uniforms);
1563   } else {
1564     SolidColorUniformLocation(GetSolidColorProgram(), &uniforms);
1565   }
1566   SetUseProgram(uniforms.program);
1567
1568   gl_->Uniform4f(uniforms.color_location,
1569                  (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
1570                  (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
1571                  (SkColorGetB(color) * (1.0f / 255.0f)) * alpha, alpha);
1572   if (use_aa) {
1573     float viewport[4] = {
1574         static_cast<float>(current_window_space_viewport_.x()),
1575         static_cast<float>(current_window_space_viewport_.y()),
1576         static_cast<float>(current_window_space_viewport_.width()),
1577         static_cast<float>(current_window_space_viewport_.height()),
1578     };
1579     gl_->Uniform4fv(uniforms.viewport_location, 1, viewport);
1580     gl_->Uniform3fv(uniforms.edge_location, 8, edge);
1581   }
1582
1583   // Enable blending when the quad properties require it or if we decided
1584   // to use antialiasing.
1585   SetBlendEnabled(quad->ShouldDrawWithBlending() || use_aa);
1586
1587   // Antialising requires a normalized quad, but this could lead to floating
1588   // point precision errors, so only normalize when antialising is on.
1589   if (use_aa) {
1590     // Normalize to tile_rect.
1591     local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
1592
1593     SetShaderQuadF(local_quad, uniforms.quad_location);
1594
1595     // The transform and vertex data are used to figure out the extents that the
1596     // un-antialiased quad should have and which vertex this is and the float
1597     // quad passed in via uniform is the actual geometry that gets used to draw
1598     // it. This is why this centered rect is used and not the original
1599     // quad_rect.
1600     gfx::RectF centered_rect(
1601         gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
1602         tile_rect.size());
1603     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1604                      centered_rect, uniforms.matrix_location);
1605   } else {
1606     PrepareGeometry(SHARED_BINDING);
1607     SetShaderQuadF(local_quad, uniforms.quad_location);
1608     static float gl_matrix[16];
1609     ToGLMatrix(&gl_matrix[0],
1610                frame->projection_matrix *
1611                    quad->shared_quad_state->quad_to_target_transform);
1612     gl_->UniformMatrix4fv(uniforms.matrix_location, 1, false, &gl_matrix[0]);
1613
1614     gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
1615   }
1616 }
1617
1618 struct TileProgramUniforms {
1619   unsigned program;
1620   unsigned matrix_location;
1621   unsigned viewport_location;
1622   unsigned quad_location;
1623   unsigned edge_location;
1624   unsigned vertex_tex_transform_location;
1625   unsigned sampler_location;
1626   unsigned fragment_tex_transform_location;
1627   unsigned alpha_location;
1628 };
1629
1630 template <class T>
1631 static void TileUniformLocation(T program, TileProgramUniforms* uniforms) {
1632   uniforms->program = program->program();
1633   uniforms->matrix_location = program->vertex_shader().matrix_location();
1634   uniforms->viewport_location = program->vertex_shader().viewport_location();
1635   uniforms->quad_location = program->vertex_shader().quad_location();
1636   uniforms->edge_location = program->vertex_shader().edge_location();
1637   uniforms->vertex_tex_transform_location =
1638       program->vertex_shader().vertex_tex_transform_location();
1639
1640   uniforms->sampler_location = program->fragment_shader().sampler_location();
1641   uniforms->alpha_location = program->fragment_shader().alpha_location();
1642   uniforms->fragment_tex_transform_location =
1643       program->fragment_shader().fragment_tex_transform_location();
1644 }
1645
1646 void GLRenderer::DrawTileQuad(const DrawingFrame* frame,
1647                               const TileDrawQuad* quad,
1648                               const gfx::QuadF* clip_region) {
1649   DrawContentQuad(frame, quad, quad->resource_id(), clip_region);
1650 }
1651
1652 void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
1653                                  const ContentDrawQuadBase* quad,
1654                                  ResourceId resource_id,
1655                                  const gfx::QuadF* clip_region) {
1656   gfx::Transform device_transform =
1657       frame->window_matrix * frame->projection_matrix *
1658       quad->shared_quad_state->quad_to_target_transform;
1659   device_transform.FlattenTo2d();
1660
1661   gfx::QuadF device_layer_quad;
1662   bool use_aa = false;
1663   bool allow_aa = settings_->allow_antialiasing && quad->IsEdge();
1664   if (allow_aa) {
1665     bool clipped = false;
1666     bool force_aa = false;
1667     device_layer_quad = MathUtil::MapQuad(
1668         device_transform,
1669         gfx::QuadF(quad->shared_quad_state->visible_quad_layer_rect), &clipped);
1670     use_aa = ShouldAntialiasQuad(device_layer_quad, clipped, force_aa);
1671   }
1672
1673   // TODO(timav): simplify coordinate transformations in DrawContentQuadAA
1674   // similar to the way DrawContentQuadNoAA works and then consider
1675   // combining DrawContentQuadAA and DrawContentQuadNoAA into one method.
1676   if (use_aa)
1677     DrawContentQuadAA(frame, quad, resource_id, device_transform,
1678                       device_layer_quad, clip_region);
1679   else
1680     DrawContentQuadNoAA(frame, quad, resource_id, clip_region);
1681 }
1682
1683 void GLRenderer::DrawContentQuadAA(const DrawingFrame* frame,
1684                                    const ContentDrawQuadBase* quad,
1685                                    ResourceId resource_id,
1686                                    const gfx::Transform& device_transform,
1687                                    const gfx::QuadF& aa_quad,
1688                                    const gfx::QuadF* clip_region) {
1689   if (!device_transform.IsInvertible())
1690     return;
1691
1692   gfx::Rect tile_rect = quad->visible_rect;
1693
1694   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
1695       quad->tex_coord_rect, quad->rect, tile_rect);
1696   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
1697   float tex_to_geom_scale_y =
1698       quad->rect.height() / quad->tex_coord_rect.height();
1699
1700   gfx::RectF clamp_geom_rect(tile_rect);
1701   gfx::RectF clamp_tex_rect(tex_coord_rect);
1702   // Clamp texture coordinates to avoid sampling outside the layer
1703   // by deflating the tile region half a texel or half a texel
1704   // minus epsilon for one pixel layers. The resulting clamp region
1705   // is mapped to the unit square by the vertex shader and mapped
1706   // back to normalized texture coordinates by the fragment shader
1707   // after being clamped to 0-1 range.
1708   float tex_clamp_x =
1709       std::min(0.5f, 0.5f * clamp_tex_rect.width() - kAntiAliasingEpsilon);
1710   float tex_clamp_y =
1711       std::min(0.5f, 0.5f * clamp_tex_rect.height() - kAntiAliasingEpsilon);
1712   float geom_clamp_x =
1713       std::min(tex_clamp_x * tex_to_geom_scale_x,
1714                0.5f * clamp_geom_rect.width() - kAntiAliasingEpsilon);
1715   float geom_clamp_y =
1716       std::min(tex_clamp_y * tex_to_geom_scale_y,
1717                0.5f * clamp_geom_rect.height() - kAntiAliasingEpsilon);
1718   clamp_geom_rect.Inset(geom_clamp_x, geom_clamp_y, geom_clamp_x, geom_clamp_y);
1719   clamp_tex_rect.Inset(tex_clamp_x, tex_clamp_y, tex_clamp_x, tex_clamp_y);
1720
1721   // Map clamping rectangle to unit square.
1722   float vertex_tex_translate_x = -clamp_geom_rect.x() / clamp_geom_rect.width();
1723   float vertex_tex_translate_y =
1724       -clamp_geom_rect.y() / clamp_geom_rect.height();
1725   float vertex_tex_scale_x = tile_rect.width() / clamp_geom_rect.width();
1726   float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
1727
1728   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1729       gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
1730
1731   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
1732   float edge[24];
1733   SetupQuadForClippingAndAntialiasing(device_transform, quad, &aa_quad,
1734                                       clip_region, &local_quad, edge);
1735   ResourceProvider::ScopedSamplerGL quad_resource_lock(
1736       resource_provider_, resource_id,
1737       quad->nearest_neighbor ? GL_NEAREST : GL_LINEAR);
1738   SamplerType sampler =
1739       SamplerTypeFromTextureTarget(quad_resource_lock.target());
1740
1741   float fragment_tex_translate_x = clamp_tex_rect.x();
1742   float fragment_tex_translate_y = clamp_tex_rect.y();
1743   float fragment_tex_scale_x = clamp_tex_rect.width();
1744   float fragment_tex_scale_y = clamp_tex_rect.height();
1745
1746   // Map to normalized texture coordinates.
1747   if (sampler != SAMPLER_TYPE_2D_RECT) {
1748     gfx::Size texture_size = quad->texture_size;
1749     DCHECK(!texture_size.IsEmpty());
1750     fragment_tex_translate_x /= texture_size.width();
1751     fragment_tex_translate_y /= texture_size.height();
1752     fragment_tex_scale_x /= texture_size.width();
1753     fragment_tex_scale_y /= texture_size.height();
1754   }
1755
1756   TileProgramUniforms uniforms;
1757   if (quad->swizzle_contents) {
1758     TileUniformLocation(GetTileProgramSwizzleAA(tex_coord_precision, sampler),
1759                         &uniforms);
1760   } else {
1761     TileUniformLocation(GetTileProgramAA(tex_coord_precision, sampler),
1762                         &uniforms);
1763   }
1764
1765   SetUseProgram(uniforms.program);
1766   gl_->Uniform1i(uniforms.sampler_location, 0);
1767
1768   float viewport[4] = {
1769       static_cast<float>(current_window_space_viewport_.x()),
1770       static_cast<float>(current_window_space_viewport_.y()),
1771       static_cast<float>(current_window_space_viewport_.width()),
1772       static_cast<float>(current_window_space_viewport_.height()),
1773   };
1774   gl_->Uniform4fv(uniforms.viewport_location, 1, viewport);
1775   gl_->Uniform3fv(uniforms.edge_location, 8, edge);
1776
1777   gl_->Uniform4f(uniforms.vertex_tex_transform_location, vertex_tex_translate_x,
1778                  vertex_tex_translate_y, vertex_tex_scale_x,
1779                  vertex_tex_scale_y);
1780   gl_->Uniform4f(uniforms.fragment_tex_transform_location,
1781                  fragment_tex_translate_x, fragment_tex_translate_y,
1782                  fragment_tex_scale_x, fragment_tex_scale_y);
1783
1784   // Blending is required for antialiasing.
1785   SetBlendEnabled(true);
1786
1787   // Normalize to tile_rect.
1788   local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
1789
1790   SetShaderOpacity(quad->shared_quad_state->opacity, uniforms.alpha_location);
1791   SetShaderQuadF(local_quad, uniforms.quad_location);
1792
1793   // The transform and vertex data are used to figure out the extents that the
1794   // un-antialiased quad should have and which vertex this is and the float
1795   // quad passed in via uniform is the actual geometry that gets used to draw
1796   // it. This is why this centered rect is used and not the original quad_rect.
1797   gfx::RectF centered_rect(
1798       gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
1799       tile_rect.size());
1800   DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
1801                    centered_rect, uniforms.matrix_location);
1802 }
1803
1804 void GLRenderer::DrawContentQuadNoAA(const DrawingFrame* frame,
1805                                      const ContentDrawQuadBase* quad,
1806                                      ResourceId resource_id,
1807                                      const gfx::QuadF* clip_region) {
1808   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
1809       quad->tex_coord_rect, quad->rect, quad->visible_rect);
1810   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
1811   float tex_to_geom_scale_y =
1812       quad->rect.height() / quad->tex_coord_rect.height();
1813
1814   bool scaled = (tex_to_geom_scale_x != 1.f || tex_to_geom_scale_y != 1.f);
1815   GLenum filter = (scaled ||
1816                    !quad->shared_quad_state->quad_to_target_transform
1817                         .IsIdentityOrIntegerTranslation()) &&
1818                           !quad->nearest_neighbor
1819                       ? GL_LINEAR
1820                       : GL_NEAREST;
1821
1822   ResourceProvider::ScopedSamplerGL quad_resource_lock(
1823       resource_provider_, resource_id, filter);
1824   SamplerType sampler =
1825       SamplerTypeFromTextureTarget(quad_resource_lock.target());
1826
1827   float vertex_tex_translate_x = tex_coord_rect.x();
1828   float vertex_tex_translate_y = tex_coord_rect.y();
1829   float vertex_tex_scale_x = tex_coord_rect.width();
1830   float vertex_tex_scale_y = tex_coord_rect.height();
1831
1832   // Map to normalized texture coordinates.
1833   if (sampler != SAMPLER_TYPE_2D_RECT) {
1834     gfx::Size texture_size = quad->texture_size;
1835     DCHECK(!texture_size.IsEmpty());
1836     vertex_tex_translate_x /= texture_size.width();
1837     vertex_tex_translate_y /= texture_size.height();
1838     vertex_tex_scale_x /= texture_size.width();
1839     vertex_tex_scale_y /= texture_size.height();
1840   }
1841
1842   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1843       gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
1844
1845   TileProgramUniforms uniforms;
1846   if (quad->ShouldDrawWithBlending()) {
1847     if (quad->swizzle_contents) {
1848       TileUniformLocation(GetTileProgramSwizzle(tex_coord_precision, sampler),
1849                           &uniforms);
1850     } else {
1851       TileUniformLocation(GetTileProgram(tex_coord_precision, sampler),
1852                           &uniforms);
1853     }
1854   } else {
1855     if (quad->swizzle_contents) {
1856       TileUniformLocation(
1857           GetTileProgramSwizzleOpaque(tex_coord_precision, sampler), &uniforms);
1858     } else {
1859       TileUniformLocation(GetTileProgramOpaque(tex_coord_precision, sampler),
1860                           &uniforms);
1861     }
1862   }
1863
1864   SetUseProgram(uniforms.program);
1865   gl_->Uniform1i(uniforms.sampler_location, 0);
1866
1867   gl_->Uniform4f(uniforms.vertex_tex_transform_location, vertex_tex_translate_x,
1868                  vertex_tex_translate_y, vertex_tex_scale_x,
1869                  vertex_tex_scale_y);
1870
1871   SetBlendEnabled(quad->ShouldDrawWithBlending());
1872
1873   SetShaderOpacity(quad->shared_quad_state->opacity, uniforms.alpha_location);
1874
1875   // Pass quad coordinates to the uniform in the same order as GeometryBinding
1876   // does, then vertices will match the texture mapping in the vertex buffer.
1877   // The method SetShaderQuadF() changes the order of vertices and so it's
1878   // not used here.
1879   gfx::QuadF tile_rect(quad->visible_rect);
1880   float width = quad->visible_rect.width();
1881   float height = quad->visible_rect.height();
1882   gfx::PointF top_left = quad->visible_rect.origin();
1883   if (clip_region) {
1884     tile_rect = *clip_region;
1885     float gl_uv[8] = {
1886         (tile_rect.p4().x() - top_left.x()) / width,
1887         (tile_rect.p4().y() - top_left.y()) / height,
1888         (tile_rect.p1().x() - top_left.x()) / width,
1889         (tile_rect.p1().y() - top_left.y()) / height,
1890         (tile_rect.p2().x() - top_left.x()) / width,
1891         (tile_rect.p2().y() - top_left.y()) / height,
1892         (tile_rect.p3().x() - top_left.x()) / width,
1893         (tile_rect.p3().y() - top_left.y()) / height,
1894     };
1895     PrepareGeometry(CLIPPED_BINDING);
1896     clipped_geometry_->InitializeCustomQuadWithUVs(
1897         gfx::QuadF(quad->visible_rect), gl_uv);
1898   } else {
1899     PrepareGeometry(SHARED_BINDING);
1900   }
1901   float gl_quad[8] = {
1902       tile_rect.p4().x(),
1903       tile_rect.p4().y(),
1904       tile_rect.p1().x(),
1905       tile_rect.p1().y(),
1906       tile_rect.p2().x(),
1907       tile_rect.p2().y(),
1908       tile_rect.p3().x(),
1909       tile_rect.p3().y(),
1910   };
1911   gl_->Uniform2fv(uniforms.quad_location, 4, gl_quad);
1912
1913   static float gl_matrix[16];
1914   ToGLMatrix(&gl_matrix[0],
1915              frame->projection_matrix *
1916                  quad->shared_quad_state->quad_to_target_transform);
1917   gl_->UniformMatrix4fv(uniforms.matrix_location, 1, false, &gl_matrix[0]);
1918
1919   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
1920 }
1921
1922 void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
1923                                   const YUVVideoDrawQuad* quad,
1924                                   const gfx::QuadF* clip_region) {
1925   SetBlendEnabled(quad->ShouldDrawWithBlending());
1926
1927   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
1928       gl_, &highp_threshold_cache_, highp_threshold_min_,
1929       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
1930
1931   bool use_alpha_plane = quad->a_plane_resource_id() != 0;
1932
1933   ResourceProvider::ScopedSamplerGL y_plane_lock(
1934       resource_provider_, quad->y_plane_resource_id(), GL_TEXTURE1, GL_LINEAR);
1935   ResourceProvider::ScopedSamplerGL u_plane_lock(
1936       resource_provider_, quad->u_plane_resource_id(), GL_TEXTURE2, GL_LINEAR);
1937   DCHECK_EQ(y_plane_lock.target(), u_plane_lock.target());
1938   ResourceProvider::ScopedSamplerGL v_plane_lock(
1939       resource_provider_, quad->v_plane_resource_id(), GL_TEXTURE3, GL_LINEAR);
1940   DCHECK_EQ(y_plane_lock.target(), v_plane_lock.target());
1941   scoped_ptr<ResourceProvider::ScopedSamplerGL> a_plane_lock;
1942   if (use_alpha_plane) {
1943     a_plane_lock.reset(new ResourceProvider::ScopedSamplerGL(
1944         resource_provider_, quad->a_plane_resource_id(), GL_TEXTURE4,
1945         GL_LINEAR));
1946     DCHECK_EQ(y_plane_lock.target(), a_plane_lock->target());
1947   }
1948
1949   // All planes must have the same sampler type.
1950   SamplerType sampler = SamplerTypeFromTextureTarget(y_plane_lock.target());
1951
1952   int matrix_location = -1;
1953   int ya_tex_scale_location = -1;
1954   int ya_tex_offset_location = -1;
1955   int uv_tex_scale_location = -1;
1956   int uv_tex_offset_location = -1;
1957   int ya_clamp_rect_location = -1;
1958   int uv_clamp_rect_location = -1;
1959   int y_texture_location = -1;
1960   int u_texture_location = -1;
1961   int v_texture_location = -1;
1962   int a_texture_location = -1;
1963   int yuv_matrix_location = -1;
1964   int yuv_adj_location = -1;
1965   int alpha_location = -1;
1966   if (use_alpha_plane) {
1967     const VideoYUVAProgram* program =
1968         GetVideoYUVAProgram(tex_coord_precision, sampler);
1969     DCHECK(program && (program->initialized() || IsContextLost()));
1970     SetUseProgram(program->program());
1971     matrix_location = program->vertex_shader().matrix_location();
1972     ya_tex_scale_location = program->vertex_shader().ya_tex_scale_location();
1973     ya_tex_offset_location = program->vertex_shader().ya_tex_offset_location();
1974     uv_tex_scale_location = program->vertex_shader().uv_tex_scale_location();
1975     uv_tex_offset_location = program->vertex_shader().uv_tex_offset_location();
1976     y_texture_location = program->fragment_shader().y_texture_location();
1977     u_texture_location = program->fragment_shader().u_texture_location();
1978     v_texture_location = program->fragment_shader().v_texture_location();
1979     a_texture_location = program->fragment_shader().a_texture_location();
1980     yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
1981     yuv_adj_location = program->fragment_shader().yuv_adj_location();
1982     ya_clamp_rect_location =
1983         program->fragment_shader().ya_clamp_rect_location();
1984     uv_clamp_rect_location =
1985         program->fragment_shader().uv_clamp_rect_location();
1986     alpha_location = program->fragment_shader().alpha_location();
1987   } else {
1988     const VideoYUVProgram* program =
1989         GetVideoYUVProgram(tex_coord_precision, sampler);
1990     DCHECK(program && (program->initialized() || IsContextLost()));
1991     SetUseProgram(program->program());
1992     matrix_location = program->vertex_shader().matrix_location();
1993     ya_tex_scale_location = program->vertex_shader().ya_tex_scale_location();
1994     ya_tex_offset_location = program->vertex_shader().ya_tex_offset_location();
1995     uv_tex_scale_location = program->vertex_shader().uv_tex_scale_location();
1996     uv_tex_offset_location = program->vertex_shader().uv_tex_offset_location();
1997     y_texture_location = program->fragment_shader().y_texture_location();
1998     u_texture_location = program->fragment_shader().u_texture_location();
1999     v_texture_location = program->fragment_shader().v_texture_location();
2000     yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
2001     yuv_adj_location = program->fragment_shader().yuv_adj_location();
2002     ya_clamp_rect_location =
2003         program->fragment_shader().ya_clamp_rect_location();
2004     uv_clamp_rect_location =
2005         program->fragment_shader().uv_clamp_rect_location();
2006     alpha_location = program->fragment_shader().alpha_location();
2007   }
2008
2009   gfx::SizeF ya_tex_scale(1.0f, 1.0f);
2010   gfx::SizeF uv_tex_scale(1.0f, 1.0f);
2011   if (sampler != SAMPLER_TYPE_2D_RECT) {
2012     DCHECK(!quad->ya_tex_size.IsEmpty());
2013     DCHECK(!quad->uv_tex_size.IsEmpty());
2014     ya_tex_scale = gfx::SizeF(1.0f / quad->ya_tex_size.width(),
2015                               1.0f / quad->ya_tex_size.height());
2016     uv_tex_scale = gfx::SizeF(1.0f / quad->uv_tex_size.width(),
2017                               1.0f / quad->uv_tex_size.height());
2018   }
2019
2020   float ya_vertex_tex_translate_x =
2021       quad->ya_tex_coord_rect.x() * ya_tex_scale.width();
2022   float ya_vertex_tex_translate_y =
2023       quad->ya_tex_coord_rect.y() * ya_tex_scale.height();
2024   float ya_vertex_tex_scale_x =
2025       quad->ya_tex_coord_rect.width() * ya_tex_scale.width();
2026   float ya_vertex_tex_scale_y =
2027       quad->ya_tex_coord_rect.height() * ya_tex_scale.height();
2028
2029   float uv_vertex_tex_translate_x =
2030       quad->uv_tex_coord_rect.x() * uv_tex_scale.width();
2031   float uv_vertex_tex_translate_y =
2032       quad->uv_tex_coord_rect.y() * uv_tex_scale.height();
2033   float uv_vertex_tex_scale_x =
2034       quad->uv_tex_coord_rect.width() * uv_tex_scale.width();
2035   float uv_vertex_tex_scale_y =
2036       quad->uv_tex_coord_rect.height() * uv_tex_scale.height();
2037
2038   gl_->Uniform2f(ya_tex_scale_location, ya_vertex_tex_scale_x,
2039                  ya_vertex_tex_scale_y);
2040   gl_->Uniform2f(ya_tex_offset_location, ya_vertex_tex_translate_x,
2041                  ya_vertex_tex_translate_y);
2042   gl_->Uniform2f(uv_tex_scale_location, uv_vertex_tex_scale_x,
2043                  uv_vertex_tex_scale_y);
2044   gl_->Uniform2f(uv_tex_offset_location, uv_vertex_tex_translate_x,
2045                  uv_vertex_tex_translate_y);
2046
2047   gfx::RectF ya_clamp_rect(ya_vertex_tex_translate_x, ya_vertex_tex_translate_y,
2048                            ya_vertex_tex_scale_x, ya_vertex_tex_scale_y);
2049   ya_clamp_rect.Inset(0.5f * ya_tex_scale.width(),
2050                       0.5f * ya_tex_scale.height());
2051   gfx::RectF uv_clamp_rect(uv_vertex_tex_translate_x, uv_vertex_tex_translate_y,
2052                            uv_vertex_tex_scale_x, uv_vertex_tex_scale_y);
2053   uv_clamp_rect.Inset(0.5f * uv_tex_scale.width(),
2054                       0.5f * uv_tex_scale.height());
2055   gl_->Uniform4f(ya_clamp_rect_location, ya_clamp_rect.x(), ya_clamp_rect.y(),
2056                  ya_clamp_rect.right(), ya_clamp_rect.bottom());
2057   gl_->Uniform4f(uv_clamp_rect_location, uv_clamp_rect.x(), uv_clamp_rect.y(),
2058                  uv_clamp_rect.right(), uv_clamp_rect.bottom());
2059
2060   gl_->Uniform1i(y_texture_location, 1);
2061   gl_->Uniform1i(u_texture_location, 2);
2062   gl_->Uniform1i(v_texture_location, 3);
2063   if (use_alpha_plane)
2064     gl_->Uniform1i(a_texture_location, 4);
2065
2066   // These values are magic numbers that are used in the transformation from YUV
2067   // to RGB color values.  They are taken from the following webpage:
2068   // http://www.fourcc.org/fccyvrgb.php
2069   float yuv_to_rgb_rec601[9] = {
2070       1.164f, 1.164f, 1.164f, 0.0f, -.391f, 2.018f, 1.596f, -.813f, 0.0f,
2071   };
2072   float yuv_to_rgb_jpeg[9] = {
2073       1.f, 1.f, 1.f, 0.0f, -.34414f, 1.772f, 1.402f, -.71414f, 0.0f,
2074   };
2075   float yuv_to_rgb_rec709[9] = {
2076       1.164f, 1.164f, 1.164f, 0.0f, -0.213f, 2.112f, 1.793f, -0.533f, 0.0f,
2077   };
2078
2079   // These values map to 16, 128, and 128 respectively, and are computed
2080   // as a fraction over 256 (e.g. 16 / 256 = 0.0625).
2081   // They are used in the YUV to RGBA conversion formula:
2082   //   Y - 16   : Gives 16 values of head and footroom for overshooting
2083   //   U - 128  : Turns unsigned U into signed U [-128,127]
2084   //   V - 128  : Turns unsigned V into signed V [-128,127]
2085   float yuv_adjust_constrained[3] = {
2086       -0.0625f, -0.5f, -0.5f,
2087   };
2088
2089   // Same as above, but without the head and footroom.
2090   float yuv_adjust_full[3] = {
2091       0.0f, -0.5f, -0.5f,
2092   };
2093
2094   float* yuv_to_rgb = NULL;
2095   float* yuv_adjust = NULL;
2096
2097   switch (quad->color_space) {
2098     case YUVVideoDrawQuad::REC_601:
2099       yuv_to_rgb = yuv_to_rgb_rec601;
2100       yuv_adjust = yuv_adjust_constrained;
2101       break;
2102     case YUVVideoDrawQuad::REC_709:
2103       yuv_to_rgb = yuv_to_rgb_rec709;
2104       yuv_adjust = yuv_adjust_constrained;
2105       break;
2106     case YUVVideoDrawQuad::JPEG:
2107       yuv_to_rgb = yuv_to_rgb_jpeg;
2108       yuv_adjust = yuv_adjust_full;
2109       break;
2110   }
2111
2112   // The transform and vertex data are used to figure out the extents that the
2113   // un-antialiased quad should have and which vertex this is and the float
2114   // quad passed in via uniform is the actual geometry that gets used to draw
2115   // it. This is why this centered rect is used and not the original quad_rect.
2116   gfx::RectF tile_rect = quad->rect;
2117   gl_->UniformMatrix3fv(yuv_matrix_location, 1, 0, yuv_to_rgb);
2118   gl_->Uniform3fv(yuv_adj_location, 1, yuv_adjust);
2119
2120   SetShaderOpacity(quad->shared_quad_state->opacity, alpha_location);
2121   if (!clip_region) {
2122     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2123                      tile_rect, matrix_location);
2124   } else {
2125     float uvs[8] = {0};
2126     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2127     gfx::QuadF region_quad = *clip_region;
2128     region_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
2129     region_quad -= gfx::Vector2dF(0.5f, 0.5f);
2130     DrawQuadGeometryClippedByQuadF(
2131         frame, quad->shared_quad_state->quad_to_target_transform, tile_rect,
2132         region_quad, matrix_location, uvs);
2133   }
2134 }
2135
2136 void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
2137                                      const StreamVideoDrawQuad* quad,
2138                                      const gfx::QuadF* clip_region) {
2139   SetBlendEnabled(quad->ShouldDrawWithBlending());
2140
2141   static float gl_matrix[16];
2142
2143   DCHECK(capabilities_.using_egl_image);
2144
2145   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2146       gl_, &highp_threshold_cache_, highp_threshold_min_,
2147       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2148
2149   const VideoStreamTextureProgram* program =
2150       GetVideoStreamTextureProgram(tex_coord_precision);
2151   SetUseProgram(program->program());
2152
2153   ToGLMatrix(&gl_matrix[0], quad->matrix);
2154   gl_->UniformMatrix4fv(program->vertex_shader().tex_matrix_location(), 1,
2155                         false, gl_matrix);
2156
2157   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2158                                           quad->resource_id());
2159   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2160   gl_->BindTexture(GL_TEXTURE_EXTERNAL_OES, lock.texture_id());
2161
2162   gl_->Uniform1i(program->fragment_shader().sampler_location(), 0);
2163
2164   SetShaderOpacity(quad->shared_quad_state->opacity,
2165                    program->fragment_shader().alpha_location());
2166   if (!clip_region) {
2167     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2168                      quad->rect, program->vertex_shader().matrix_location());
2169   } else {
2170     gfx::QuadF region_quad(*clip_region);
2171     region_quad.Scale(1.0f / quad->rect.width(), 1.0f / quad->rect.height());
2172     region_quad -= gfx::Vector2dF(0.5f, 0.5f);
2173     float uvs[8] = {0};
2174     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2175     DrawQuadGeometryClippedByQuadF(
2176         frame, quad->shared_quad_state->quad_to_target_transform, quad->rect,
2177         region_quad, program->vertex_shader().matrix_location(), uvs);
2178   }
2179 }
2180
2181 struct TextureProgramBinding {
2182   template <class Program>
2183   void Set(Program* program) {
2184     DCHECK(program);
2185     program_id = program->program();
2186     sampler_location = program->fragment_shader().sampler_location();
2187     matrix_location = program->vertex_shader().matrix_location();
2188     background_color_location =
2189         program->fragment_shader().background_color_location();
2190   }
2191   int program_id;
2192   int sampler_location;
2193   int matrix_location;
2194   int transform_location;
2195   int background_color_location;
2196 };
2197
2198 struct TexTransformTextureProgramBinding : TextureProgramBinding {
2199   template <class Program>
2200   void Set(Program* program) {
2201     TextureProgramBinding::Set(program);
2202     tex_transform_location = program->vertex_shader().tex_transform_location();
2203     vertex_opacity_location =
2204         program->vertex_shader().vertex_opacity_location();
2205   }
2206   int tex_transform_location;
2207   int vertex_opacity_location;
2208 };
2209
2210 void GLRenderer::FlushTextureQuadCache(BoundGeometry flush_binding) {
2211   // Check to see if we have anything to draw.
2212   if (draw_cache_.program_id == -1)
2213     return;
2214
2215   PrepareGeometry(flush_binding);
2216
2217   // Set the correct blending mode.
2218   SetBlendEnabled(draw_cache_.needs_blending);
2219
2220   // Bind the program to the GL state.
2221   SetUseProgram(draw_cache_.program_id);
2222
2223   // Bind the correct texture sampler location.
2224   gl_->Uniform1i(draw_cache_.sampler_location, 0);
2225
2226   // Assume the current active textures is 0.
2227   ResourceProvider::ScopedSamplerGL locked_quad(
2228       resource_provider_,
2229       draw_cache_.resource_id,
2230       draw_cache_.nearest_neighbor ? GL_NEAREST : GL_LINEAR);
2231   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2232   gl_->BindTexture(locked_quad.target(), locked_quad.texture_id());
2233
2234   static_assert(sizeof(Float4) == 4 * sizeof(float),
2235                 "Float4 struct should be densely packed");
2236   static_assert(sizeof(Float16) == 16 * sizeof(float),
2237                 "Float16 struct should be densely packed");
2238
2239   // Upload the tranforms for both points and uvs.
2240   gl_->UniformMatrix4fv(
2241       static_cast<int>(draw_cache_.matrix_location),
2242       static_cast<int>(draw_cache_.matrix_data.size()), false,
2243       reinterpret_cast<float*>(&draw_cache_.matrix_data.front()));
2244   gl_->Uniform4fv(static_cast<int>(draw_cache_.uv_xform_location),
2245                   static_cast<int>(draw_cache_.uv_xform_data.size()),
2246                   reinterpret_cast<float*>(&draw_cache_.uv_xform_data.front()));
2247
2248   if (draw_cache_.background_color != SK_ColorTRANSPARENT) {
2249     Float4 background_color = PremultipliedColor(draw_cache_.background_color);
2250     gl_->Uniform4fv(draw_cache_.background_color_location, 1,
2251                     background_color.data);
2252   }
2253
2254   gl_->Uniform1fv(
2255       static_cast<int>(draw_cache_.vertex_opacity_location),
2256       static_cast<int>(draw_cache_.vertex_opacity_data.size()),
2257       static_cast<float*>(&draw_cache_.vertex_opacity_data.front()));
2258
2259   DCHECK_LE(draw_cache_.matrix_data.size(),
2260             static_cast<size_t>(std::numeric_limits<int>::max()) / 6u);
2261   // Draw the quads!
2262   gl_->DrawElements(GL_TRIANGLES,
2263                     6 * static_cast<int>(draw_cache_.matrix_data.size()),
2264                     GL_UNSIGNED_SHORT, 0);
2265
2266   // Clear the cache.
2267   draw_cache_.program_id = -1;
2268   draw_cache_.uv_xform_data.resize(0);
2269   draw_cache_.vertex_opacity_data.resize(0);
2270   draw_cache_.matrix_data.resize(0);
2271
2272   // If we had a clipped binding, prepare the shared binding for the
2273   // next inserts.
2274   if (flush_binding == CLIPPED_BINDING) {
2275     PrepareGeometry(SHARED_BINDING);
2276   }
2277 }
2278
2279 void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
2280                                     const TextureDrawQuad* quad,
2281                                     const gfx::QuadF* clip_region) {
2282   // If we have a clip_region then we have to render the next quad
2283   // with dynamic geometry, therefore we must flush all pending
2284   // texture quads.
2285   if (clip_region) {
2286     // We send in false here because we want to flush what's currently in the
2287     // queue using the shared_geometry and not clipped_geometry
2288     FlushTextureQuadCache(SHARED_BINDING);
2289   }
2290
2291   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2292       gl_, &highp_threshold_cache_, highp_threshold_min_,
2293       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2294
2295   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2296                                           quad->resource_id());
2297   const SamplerType sampler = SamplerTypeFromTextureTarget(lock.target());
2298   // Choose the correct texture program binding
2299   TexTransformTextureProgramBinding binding;
2300   if (quad->premultiplied_alpha) {
2301     if (quad->background_color == SK_ColorTRANSPARENT) {
2302       binding.Set(GetTextureProgram(tex_coord_precision, sampler));
2303     } else {
2304       binding.Set(GetTextureBackgroundProgram(tex_coord_precision, sampler));
2305     }
2306   } else {
2307     if (quad->background_color == SK_ColorTRANSPARENT) {
2308       binding.Set(
2309           GetNonPremultipliedTextureProgram(tex_coord_precision, sampler));
2310     } else {
2311       binding.Set(GetNonPremultipliedTextureBackgroundProgram(
2312           tex_coord_precision, sampler));
2313     }
2314   }
2315
2316   int resource_id = quad->resource_id();
2317
2318   if (draw_cache_.program_id != binding.program_id ||
2319       draw_cache_.resource_id != resource_id ||
2320       draw_cache_.needs_blending != quad->ShouldDrawWithBlending() ||
2321       draw_cache_.nearest_neighbor != quad->nearest_neighbor ||
2322       draw_cache_.background_color != quad->background_color ||
2323       draw_cache_.matrix_data.size() >= 8) {
2324     FlushTextureQuadCache(SHARED_BINDING);
2325     draw_cache_.program_id = binding.program_id;
2326     draw_cache_.resource_id = resource_id;
2327     draw_cache_.needs_blending = quad->ShouldDrawWithBlending();
2328     draw_cache_.nearest_neighbor = quad->nearest_neighbor;
2329     draw_cache_.background_color = quad->background_color;
2330
2331     draw_cache_.uv_xform_location = binding.tex_transform_location;
2332     draw_cache_.background_color_location = binding.background_color_location;
2333     draw_cache_.vertex_opacity_location = binding.vertex_opacity_location;
2334     draw_cache_.matrix_location = binding.matrix_location;
2335     draw_cache_.sampler_location = binding.sampler_location;
2336   }
2337
2338   // Generate the uv-transform
2339   if (!clip_region) {
2340     draw_cache_.uv_xform_data.push_back(UVTransform(quad));
2341   } else {
2342     Float4 uv_transform = {{0.0f, 0.0f, 1.0f, 1.0f}};
2343     draw_cache_.uv_xform_data.push_back(uv_transform);
2344   }
2345
2346   // Generate the vertex opacity
2347   const float opacity = quad->shared_quad_state->opacity;
2348   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[0] * opacity);
2349   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[1] * opacity);
2350   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[2] * opacity);
2351   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[3] * opacity);
2352
2353   // Generate the transform matrix
2354   gfx::Transform quad_rect_matrix;
2355   QuadRectTransform(&quad_rect_matrix,
2356                     quad->shared_quad_state->quad_to_target_transform,
2357                     quad->rect);
2358   quad_rect_matrix = frame->projection_matrix * quad_rect_matrix;
2359
2360   Float16 m;
2361   quad_rect_matrix.matrix().asColMajorf(m.data);
2362   draw_cache_.matrix_data.push_back(m);
2363
2364   if (clip_region) {
2365     gfx::QuadF scaled_region;
2366     if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
2367       scaled_region = SharedGeometryQuad().BoundingBox();
2368     }
2369     // Both the scaled region and the SharedGeomtryQuad are in the space
2370     // -0.5->0.5. We need to move that to the space 0->1.
2371     float uv[8];
2372     uv[0] = scaled_region.p1().x() + 0.5f;
2373     uv[1] = scaled_region.p1().y() + 0.5f;
2374     uv[2] = scaled_region.p2().x() + 0.5f;
2375     uv[3] = scaled_region.p2().y() + 0.5f;
2376     uv[4] = scaled_region.p3().x() + 0.5f;
2377     uv[5] = scaled_region.p3().y() + 0.5f;
2378     uv[6] = scaled_region.p4().x() + 0.5f;
2379     uv[7] = scaled_region.p4().y() + 0.5f;
2380     PrepareGeometry(CLIPPED_BINDING);
2381     clipped_geometry_->InitializeCustomQuadWithUVs(scaled_region, uv);
2382     FlushTextureQuadCache(CLIPPED_BINDING);
2383   }
2384 }
2385
2386 void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
2387                                    const IOSurfaceDrawQuad* quad,
2388                                    const gfx::QuadF* clip_region) {
2389   SetBlendEnabled(quad->ShouldDrawWithBlending());
2390
2391   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
2392       gl_, &highp_threshold_cache_, highp_threshold_min_,
2393       quad->shared_quad_state->visible_quad_layer_rect.bottom_right());
2394
2395   TexTransformTextureProgramBinding binding;
2396   binding.Set(GetTextureIOSurfaceProgram(tex_coord_precision));
2397
2398   SetUseProgram(binding.program_id);
2399   gl_->Uniform1i(binding.sampler_location, 0);
2400   if (quad->orientation == IOSurfaceDrawQuad::FLIPPED) {
2401     gl_->Uniform4f(
2402         binding.tex_transform_location, 0, quad->io_surface_size.height(),
2403         quad->io_surface_size.width(), quad->io_surface_size.height() * -1.0f);
2404   } else {
2405     gl_->Uniform4f(binding.tex_transform_location, 0, 0,
2406                    quad->io_surface_size.width(),
2407                    quad->io_surface_size.height());
2408   }
2409
2410   const float vertex_opacity[] = {quad->shared_quad_state->opacity,
2411                                   quad->shared_quad_state->opacity,
2412                                   quad->shared_quad_state->opacity,
2413                                   quad->shared_quad_state->opacity};
2414   gl_->Uniform1fv(binding.vertex_opacity_location, 4, vertex_opacity);
2415
2416   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
2417                                           quad->io_surface_resource_id());
2418   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
2419   gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, lock.texture_id());
2420
2421   if (!clip_region) {
2422     DrawQuadGeometry(frame, quad->shared_quad_state->quad_to_target_transform,
2423                      quad->rect, binding.matrix_location);
2424   } else {
2425     float uvs[8] = {0};
2426     GetScaledUVs(quad->visible_rect, clip_region, uvs);
2427     DrawQuadGeometryClippedByQuadF(
2428         frame, quad->shared_quad_state->quad_to_target_transform, quad->rect,
2429         *clip_region, binding.matrix_location, uvs);
2430   }
2431
2432   gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
2433 }
2434
2435 void GLRenderer::FinishDrawingFrame(DrawingFrame* frame) {
2436   if (use_sync_query_) {
2437     DCHECK(current_sync_query_);
2438     current_sync_query_->End();
2439     pending_sync_queries_.push_back(current_sync_query_.Pass());
2440   }
2441
2442   current_framebuffer_lock_ = nullptr;
2443   swap_buffer_rect_.Union(gfx::ToEnclosingRect(frame->root_damage_rect));
2444
2445   gl_->Disable(GL_BLEND);
2446   blend_shadow_ = false;
2447
2448   ScheduleOverlays(frame);
2449 }
2450
2451 void GLRenderer::FinishDrawingQuadList() {
2452   FlushTextureQuadCache(SHARED_BINDING);
2453 }
2454
2455 bool GLRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
2456   if (frame->current_render_pass != frame->root_render_pass)
2457     return true;
2458   return FlippedRootFramebuffer();
2459 }
2460
2461 bool GLRenderer::FlippedRootFramebuffer() const {
2462   // GL is normally flipped, so a flipped output results in an unflipping.
2463   return !output_surface_->capabilities().flipped_output_surface;
2464 }
2465
2466 void GLRenderer::EnsureScissorTestEnabled() {
2467   if (is_scissor_enabled_)
2468     return;
2469
2470   FlushTextureQuadCache(SHARED_BINDING);
2471   gl_->Enable(GL_SCISSOR_TEST);
2472   is_scissor_enabled_ = true;
2473 }
2474
2475 void GLRenderer::EnsureScissorTestDisabled() {
2476   if (!is_scissor_enabled_)
2477     return;
2478
2479   FlushTextureQuadCache(SHARED_BINDING);
2480   gl_->Disable(GL_SCISSOR_TEST);
2481   is_scissor_enabled_ = false;
2482 }
2483
2484 void GLRenderer::CopyCurrentRenderPassToBitmap(
2485     DrawingFrame* frame,
2486     scoped_ptr<CopyOutputRequest> request) {
2487   TRACE_EVENT0("cc", "GLRenderer::CopyCurrentRenderPassToBitmap");
2488   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
2489   if (request->has_area())
2490     copy_rect.Intersect(request->area());
2491   GetFramebufferPixelsAsync(frame, copy_rect, request.Pass());
2492 }
2493
2494 void GLRenderer::ToGLMatrix(float* gl_matrix, const gfx::Transform& transform) {
2495   transform.matrix().asColMajorf(gl_matrix);
2496 }
2497
2498 void GLRenderer::SetShaderQuadF(const gfx::QuadF& quad, int quad_location) {
2499   if (quad_location == -1)
2500     return;
2501
2502   float gl_quad[8];
2503   gl_quad[0] = quad.p1().x();
2504   gl_quad[1] = quad.p1().y();
2505   gl_quad[2] = quad.p2().x();
2506   gl_quad[3] = quad.p2().y();
2507   gl_quad[4] = quad.p3().x();
2508   gl_quad[5] = quad.p3().y();
2509   gl_quad[6] = quad.p4().x();
2510   gl_quad[7] = quad.p4().y();
2511   gl_->Uniform2fv(quad_location, 4, gl_quad);
2512 }
2513
2514 void GLRenderer::SetShaderOpacity(float opacity, int alpha_location) {
2515   if (alpha_location != -1)
2516     gl_->Uniform1f(alpha_location, opacity);
2517 }
2518
2519 void GLRenderer::SetStencilEnabled(bool enabled) {
2520   if (enabled == stencil_shadow_)
2521     return;
2522
2523   if (enabled)
2524     gl_->Enable(GL_STENCIL_TEST);
2525   else
2526     gl_->Disable(GL_STENCIL_TEST);
2527   stencil_shadow_ = enabled;
2528 }
2529
2530 void GLRenderer::SetBlendEnabled(bool enabled) {
2531   if (enabled == blend_shadow_)
2532     return;
2533
2534   if (enabled)
2535     gl_->Enable(GL_BLEND);
2536   else
2537     gl_->Disable(GL_BLEND);
2538   blend_shadow_ = enabled;
2539 }
2540
2541 void GLRenderer::SetUseProgram(unsigned program) {
2542   if (program == program_shadow_)
2543     return;
2544   gl_->UseProgram(program);
2545   program_shadow_ = program;
2546 }
2547
2548 void GLRenderer::DrawQuadGeometryClippedByQuadF(
2549     const DrawingFrame* frame,
2550     const gfx::Transform& draw_transform,
2551     const gfx::RectF& quad_rect,
2552     const gfx::QuadF& clipping_region_quad,
2553     int matrix_location,
2554     const float* uvs) {
2555   PrepareGeometry(CLIPPED_BINDING);
2556   if (uvs) {
2557     clipped_geometry_->InitializeCustomQuadWithUVs(clipping_region_quad, uvs);
2558   } else {
2559     clipped_geometry_->InitializeCustomQuad(clipping_region_quad);
2560   }
2561   gfx::Transform quad_rect_matrix;
2562   QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
2563   static float gl_matrix[16];
2564   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
2565   gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]);
2566
2567   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT,
2568                     reinterpret_cast<const void*>(0));
2569 }
2570
2571 void GLRenderer::DrawQuadGeometry(const DrawingFrame* frame,
2572                                   const gfx::Transform& draw_transform,
2573                                   const gfx::RectF& quad_rect,
2574                                   int matrix_location) {
2575   PrepareGeometry(SHARED_BINDING);
2576   gfx::Transform quad_rect_matrix;
2577   QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
2578   static float gl_matrix[16];
2579   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
2580   gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]);
2581
2582   gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
2583 }
2584
2585 void GLRenderer::Finish() {
2586   TRACE_EVENT0("cc", "GLRenderer::Finish");
2587   gl_->Finish();
2588 }
2589
2590 void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
2591   DCHECK(!is_backbuffer_discarded_);
2592
2593   TRACE_EVENT0("cc,benchmark", "GLRenderer::SwapBuffers");
2594   // We're done! Time to swapbuffers!
2595
2596   gfx::Size surface_size = output_surface_->SurfaceSize();
2597
2598   CompositorFrame compositor_frame;
2599   compositor_frame.metadata = metadata;
2600   compositor_frame.gl_frame_data = make_scoped_ptr(new GLFrameData);
2601   compositor_frame.gl_frame_data->size = surface_size;
2602   if (capabilities_.using_partial_swap) {
2603     // If supported, we can save significant bandwidth by only swapping the
2604     // damaged/scissored region (clamped to the viewport).
2605     swap_buffer_rect_.Intersect(gfx::Rect(surface_size));
2606     int flipped_y_pos_of_rect_bottom = surface_size.height() -
2607                                        swap_buffer_rect_.y() -
2608                                        swap_buffer_rect_.height();
2609     compositor_frame.gl_frame_data->sub_buffer_rect =
2610         gfx::Rect(swap_buffer_rect_.x(),
2611                   FlippedRootFramebuffer() ? flipped_y_pos_of_rect_bottom
2612                                            : swap_buffer_rect_.y(),
2613                   swap_buffer_rect_.width(),
2614                   swap_buffer_rect_.height());
2615   } else {
2616     compositor_frame.gl_frame_data->sub_buffer_rect =
2617         gfx::Rect(output_surface_->SurfaceSize());
2618   }
2619   output_surface_->SwapBuffers(&compositor_frame);
2620
2621   // Release previously used overlay resources and hold onto the pending ones
2622   // until the next swap buffers.
2623   in_use_overlay_resources_.clear();
2624   in_use_overlay_resources_.swap(pending_overlay_resources_);
2625
2626   swap_buffer_rect_ = gfx::Rect();
2627 }
2628
2629 void GLRenderer::EnforceMemoryPolicy() {
2630   if (!visible()) {
2631     TRACE_EVENT0("cc", "GLRenderer::EnforceMemoryPolicy dropping resources");
2632     ReleaseRenderPassTextures();
2633     DiscardBackbuffer();
2634     output_surface_->context_provider()->DeleteCachedResources();
2635     gl_->Flush();
2636   }
2637   PrepareGeometry(NO_BINDING);
2638 }
2639
2640 void GLRenderer::DiscardBackbuffer() {
2641   if (is_backbuffer_discarded_)
2642     return;
2643
2644   output_surface_->DiscardBackbuffer();
2645
2646   is_backbuffer_discarded_ = true;
2647
2648   // Damage tracker needs a full reset every time framebuffer is discarded.
2649   client_->SetFullRootLayerDamage();
2650 }
2651
2652 void GLRenderer::EnsureBackbuffer() {
2653   if (!is_backbuffer_discarded_)
2654     return;
2655
2656   output_surface_->EnsureBackbuffer();
2657   is_backbuffer_discarded_ = false;
2658 }
2659
2660 void GLRenderer::GetFramebufferPixelsAsync(
2661     const DrawingFrame* frame,
2662     const gfx::Rect& rect,
2663     scoped_ptr<CopyOutputRequest> request) {
2664   DCHECK(!request->IsEmpty());
2665   if (request->IsEmpty())
2666     return;
2667   if (rect.IsEmpty())
2668     return;
2669
2670   gfx::Rect window_rect = MoveFromDrawToWindowSpace(frame, rect);
2671   DCHECK_GE(window_rect.x(), 0);
2672   DCHECK_GE(window_rect.y(), 0);
2673   DCHECK_LE(window_rect.right(), current_surface_size_.width());
2674   DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
2675
2676   if (!request->force_bitmap_result()) {
2677     bool own_mailbox = !request->has_texture_mailbox();
2678
2679     GLuint texture_id = 0;
2680     gpu::Mailbox mailbox;
2681     if (own_mailbox) {
2682       gl_->GenMailboxCHROMIUM(mailbox.name);
2683       gl_->GenTextures(1, &texture_id);
2684       gl_->BindTexture(GL_TEXTURE_2D, texture_id);
2685
2686       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2687       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
2688       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2689       gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2690       gl_->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
2691     } else {
2692       mailbox = request->texture_mailbox().mailbox();
2693       DCHECK_EQ(static_cast<unsigned>(GL_TEXTURE_2D),
2694                 request->texture_mailbox().target());
2695       DCHECK(!mailbox.IsZero());
2696       unsigned incoming_sync_point = request->texture_mailbox().sync_point();
2697       if (incoming_sync_point)
2698         gl_->WaitSyncPointCHROMIUM(incoming_sync_point);
2699
2700       texture_id =
2701           gl_->CreateAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
2702     }
2703     GetFramebufferTexture(texture_id, RGBA_8888, window_rect);
2704
2705     unsigned sync_point = gl_->InsertSyncPointCHROMIUM();
2706     TextureMailbox texture_mailbox(mailbox, GL_TEXTURE_2D, sync_point);
2707
2708     scoped_ptr<SingleReleaseCallback> release_callback;
2709     if (own_mailbox) {
2710       gl_->BindTexture(GL_TEXTURE_2D, 0);
2711       release_callback = texture_mailbox_deleter_->GetReleaseCallback(
2712           output_surface_->context_provider(), texture_id);
2713     } else {
2714       gl_->DeleteTextures(1, &texture_id);
2715     }
2716
2717     request->SendTextureResult(
2718         window_rect.size(), texture_mailbox, release_callback.Pass());
2719     return;
2720   }
2721
2722   DCHECK(request->force_bitmap_result());
2723
2724   scoped_ptr<PendingAsyncReadPixels> pending_read(new PendingAsyncReadPixels);
2725   pending_read->copy_request = request.Pass();
2726   pending_async_read_pixels_.insert(pending_async_read_pixels_.begin(),
2727                                     pending_read.Pass());
2728
2729   bool do_workaround = NeedsIOSurfaceReadbackWorkaround();
2730
2731   unsigned temporary_texture = 0;
2732   unsigned temporary_fbo = 0;
2733
2734   if (do_workaround) {
2735     // On Mac OS X, calling glReadPixels() against an FBO whose color attachment
2736     // is an IOSurface-backed texture causes corruption of future glReadPixels()
2737     // calls, even those on different OpenGL contexts. It is believed that this
2738     // is the root cause of top crasher
2739     // http://crbug.com/99393. <rdar://problem/10949687>
2740
2741     gl_->GenTextures(1, &temporary_texture);
2742     gl_->BindTexture(GL_TEXTURE_2D, temporary_texture);
2743     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2744     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
2745     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2746     gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2747     // Copy the contents of the current (IOSurface-backed) framebuffer into a
2748     // temporary texture.
2749     GetFramebufferTexture(
2750         temporary_texture, RGBA_8888, gfx::Rect(current_surface_size_));
2751     gl_->GenFramebuffers(1, &temporary_fbo);
2752     // Attach this texture to an FBO, and perform the readback from that FBO.
2753     gl_->BindFramebuffer(GL_FRAMEBUFFER, temporary_fbo);
2754     gl_->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
2755                               GL_TEXTURE_2D, temporary_texture, 0);
2756
2757     DCHECK_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
2758               gl_->CheckFramebufferStatus(GL_FRAMEBUFFER));
2759   }
2760
2761   GLuint buffer = 0;
2762   gl_->GenBuffers(1, &buffer);
2763   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, buffer);
2764   gl_->BufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
2765                   4 * window_rect.size().GetArea(), NULL, GL_STREAM_READ);
2766
2767   GLuint query = 0;
2768   gl_->GenQueriesEXT(1, &query);
2769   gl_->BeginQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM, query);
2770
2771   gl_->ReadPixels(window_rect.x(), window_rect.y(), window_rect.width(),
2772                   window_rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, NULL);
2773
2774   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
2775
2776   if (do_workaround) {
2777     // Clean up.
2778     gl_->BindFramebuffer(GL_FRAMEBUFFER, 0);
2779     gl_->BindTexture(GL_TEXTURE_2D, 0);
2780     gl_->DeleteFramebuffers(1, &temporary_fbo);
2781     gl_->DeleteTextures(1, &temporary_texture);
2782   }
2783
2784   base::Closure finished_callback = base::Bind(&GLRenderer::FinishedReadback,
2785                                                base::Unretained(this),
2786                                                buffer,
2787                                                query,
2788                                                window_rect.size());
2789   // Save the finished_callback so it can be cancelled.
2790   pending_async_read_pixels_.front()->finished_read_pixels_callback.Reset(
2791       finished_callback);
2792   base::Closure cancelable_callback =
2793       pending_async_read_pixels_.front()->
2794           finished_read_pixels_callback.callback();
2795
2796   // Save the buffer to verify the callbacks happen in the expected order.
2797   pending_async_read_pixels_.front()->buffer = buffer;
2798
2799   gl_->EndQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM);
2800   context_support_->SignalQuery(query, cancelable_callback);
2801
2802   EnforceMemoryPolicy();
2803 }
2804
2805 void GLRenderer::FinishedReadback(unsigned source_buffer,
2806                                   unsigned query,
2807                                   const gfx::Size& size) {
2808   DCHECK(!pending_async_read_pixels_.empty());
2809
2810   if (query != 0) {
2811     gl_->DeleteQueriesEXT(1, &query);
2812   }
2813
2814   PendingAsyncReadPixels* current_read = pending_async_read_pixels_.back();
2815   // Make sure we service the readbacks in order.
2816   DCHECK_EQ(source_buffer, current_read->buffer);
2817
2818   uint8* src_pixels = NULL;
2819   scoped_ptr<SkBitmap> bitmap;
2820
2821   if (source_buffer != 0) {
2822     gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, source_buffer);
2823     src_pixels = static_cast<uint8*>(gl_->MapBufferCHROMIUM(
2824         GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, GL_READ_ONLY));
2825
2826     if (src_pixels) {
2827       bitmap.reset(new SkBitmap);
2828       bitmap->allocN32Pixels(size.width(), size.height());
2829       scoped_ptr<SkAutoLockPixels> lock(new SkAutoLockPixels(*bitmap));
2830       uint8* dest_pixels = static_cast<uint8*>(bitmap->getPixels());
2831
2832       size_t row_bytes = size.width() * 4;
2833       int num_rows = size.height();
2834       size_t total_bytes = num_rows * row_bytes;
2835       for (size_t dest_y = 0; dest_y < total_bytes; dest_y += row_bytes) {
2836         // Flip Y axis.
2837         size_t src_y = total_bytes - dest_y - row_bytes;
2838         // Swizzle OpenGL -> Skia byte order.
2839         for (size_t x = 0; x < row_bytes; x += 4) {
2840           dest_pixels[dest_y + x + SK_R32_SHIFT / 8] =
2841               src_pixels[src_y + x + 0];
2842           dest_pixels[dest_y + x + SK_G32_SHIFT / 8] =
2843               src_pixels[src_y + x + 1];
2844           dest_pixels[dest_y + x + SK_B32_SHIFT / 8] =
2845               src_pixels[src_y + x + 2];
2846           dest_pixels[dest_y + x + SK_A32_SHIFT / 8] =
2847               src_pixels[src_y + x + 3];
2848         }
2849       }
2850
2851       gl_->UnmapBufferCHROMIUM(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM);
2852     }
2853     gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
2854     gl_->DeleteBuffers(1, &source_buffer);
2855   }
2856
2857   if (bitmap)
2858     current_read->copy_request->SendBitmapResult(bitmap.Pass());
2859   pending_async_read_pixels_.pop_back();
2860 }
2861
2862 void GLRenderer::GetFramebufferTexture(unsigned texture_id,
2863                                        ResourceFormat texture_format,
2864                                        const gfx::Rect& window_rect) {
2865   DCHECK(texture_id);
2866   DCHECK_GE(window_rect.x(), 0);
2867   DCHECK_GE(window_rect.y(), 0);
2868   DCHECK_LE(window_rect.right(), current_surface_size_.width());
2869   DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
2870
2871   gl_->BindTexture(GL_TEXTURE_2D, texture_id);
2872   gl_->CopyTexImage2D(GL_TEXTURE_2D, 0, GLDataFormat(texture_format),
2873                       window_rect.x(), window_rect.y(), window_rect.width(),
2874                       window_rect.height(), 0);
2875   gl_->BindTexture(GL_TEXTURE_2D, 0);
2876 }
2877
2878 bool GLRenderer::UseScopedTexture(DrawingFrame* frame,
2879                                   const ScopedResource* texture,
2880                                   const gfx::Rect& viewport_rect) {
2881   DCHECK(texture->id());
2882   frame->current_render_pass = NULL;
2883   frame->current_texture = texture;
2884
2885   return BindFramebufferToTexture(frame, texture, viewport_rect);
2886 }
2887
2888 void GLRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
2889   current_framebuffer_lock_ = nullptr;
2890   output_surface_->BindFramebuffer();
2891
2892   if (output_surface_->HasExternalStencilTest()) {
2893     SetStencilEnabled(true);
2894     gl_->StencilFunc(GL_EQUAL, 1, 1);
2895   } else {
2896     SetStencilEnabled(false);
2897   }
2898 }
2899
2900 bool GLRenderer::BindFramebufferToTexture(DrawingFrame* frame,
2901                                           const ScopedResource* texture,
2902                                           const gfx::Rect& target_rect) {
2903   DCHECK(texture->id());
2904
2905   // Explicitly release lock, otherwise we can crash when try to lock
2906   // same texture again.
2907   current_framebuffer_lock_ = nullptr;
2908
2909   SetStencilEnabled(false);
2910   gl_->BindFramebuffer(GL_FRAMEBUFFER, offscreen_framebuffer_id_);
2911   current_framebuffer_lock_ =
2912       make_scoped_ptr(new ResourceProvider::ScopedWriteLockGL(
2913           resource_provider_, texture->id()));
2914   unsigned texture_id = current_framebuffer_lock_->texture_id();
2915   gl_->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
2916                             texture_id, 0);
2917
2918   DCHECK(gl_->CheckFramebufferStatus(GL_FRAMEBUFFER) ==
2919              GL_FRAMEBUFFER_COMPLETE ||
2920          IsContextLost());
2921   return true;
2922 }
2923
2924 void GLRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
2925   EnsureScissorTestEnabled();
2926
2927   // Don't unnecessarily ask the context to change the scissor, because it
2928   // may cause undesired GPU pipeline flushes.
2929   if (scissor_rect == scissor_rect_ && !scissor_rect_needs_reset_)
2930     return;
2931
2932   scissor_rect_ = scissor_rect;
2933   FlushTextureQuadCache(SHARED_BINDING);
2934   gl_->Scissor(scissor_rect.x(), scissor_rect.y(), scissor_rect.width(),
2935                scissor_rect.height());
2936
2937   scissor_rect_needs_reset_ = false;
2938 }
2939
2940 void GLRenderer::SetViewport() {
2941   gl_->Viewport(current_window_space_viewport_.x(),
2942                 current_window_space_viewport_.y(),
2943                 current_window_space_viewport_.width(),
2944                 current_window_space_viewport_.height());
2945 }
2946
2947 void GLRenderer::InitializeSharedObjects() {
2948   TRACE_EVENT0("cc", "GLRenderer::InitializeSharedObjects");
2949
2950   // Create an FBO for doing offscreen rendering.
2951   gl_->GenFramebuffers(1, &offscreen_framebuffer_id_);
2952
2953   shared_geometry_ =
2954       make_scoped_ptr(new StaticGeometryBinding(gl_, QuadVertexRect()));
2955   clipped_geometry_ = make_scoped_ptr(new DynamicGeometryBinding(gl_));
2956 }
2957
2958 void GLRenderer::PrepareGeometry(BoundGeometry binding) {
2959   if (binding == bound_geometry_) {
2960     return;
2961   }
2962
2963   switch (binding) {
2964     case SHARED_BINDING:
2965       shared_geometry_->PrepareForDraw();
2966       break;
2967     case CLIPPED_BINDING:
2968       clipped_geometry_->PrepareForDraw();
2969       break;
2970     case NO_BINDING:
2971       break;
2972   }
2973   bound_geometry_ = binding;
2974 }
2975
2976 const GLRenderer::DebugBorderProgram* GLRenderer::GetDebugBorderProgram() {
2977   if (!debug_border_program_.initialized()) {
2978     TRACE_EVENT0("cc", "GLRenderer::debugBorderProgram::initialize");
2979     debug_border_program_.Initialize(output_surface_->context_provider(),
2980                                      TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
2981   }
2982   return &debug_border_program_;
2983 }
2984
2985 const GLRenderer::SolidColorProgram* GLRenderer::GetSolidColorProgram() {
2986   if (!solid_color_program_.initialized()) {
2987     TRACE_EVENT0("cc", "GLRenderer::solidColorProgram::initialize");
2988     solid_color_program_.Initialize(output_surface_->context_provider(),
2989                                     TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
2990   }
2991   return &solid_color_program_;
2992 }
2993
2994 const GLRenderer::SolidColorProgramAA* GLRenderer::GetSolidColorProgramAA() {
2995   if (!solid_color_program_aa_.initialized()) {
2996     TRACE_EVENT0("cc", "GLRenderer::solidColorProgramAA::initialize");
2997     solid_color_program_aa_.Initialize(output_surface_->context_provider(),
2998                                        TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
2999   }
3000   return &solid_color_program_aa_;
3001 }
3002
3003 const GLRenderer::RenderPassProgram* GLRenderer::GetRenderPassProgram(
3004     TexCoordPrecision precision,
3005     BlendMode blend_mode) {
3006   DCHECK_GE(precision, 0);
3007   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3008   DCHECK_GE(blend_mode, 0);
3009   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3010   RenderPassProgram* program = &render_pass_program_[precision][blend_mode];
3011   if (!program->initialized()) {
3012     TRACE_EVENT0("cc", "GLRenderer::renderPassProgram::initialize");
3013     program->Initialize(output_surface_->context_provider(), precision,
3014                         SAMPLER_TYPE_2D, blend_mode);
3015   }
3016   return program;
3017 }
3018
3019 const GLRenderer::RenderPassProgramAA* GLRenderer::GetRenderPassProgramAA(
3020     TexCoordPrecision precision,
3021     BlendMode blend_mode) {
3022   DCHECK_GE(precision, 0);
3023   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3024   DCHECK_GE(blend_mode, 0);
3025   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3026   RenderPassProgramAA* program =
3027       &render_pass_program_aa_[precision][blend_mode];
3028   if (!program->initialized()) {
3029     TRACE_EVENT0("cc", "GLRenderer::renderPassProgramAA::initialize");
3030     program->Initialize(output_surface_->context_provider(), precision,
3031                         SAMPLER_TYPE_2D, blend_mode);
3032   }
3033   return program;
3034 }
3035
3036 const GLRenderer::RenderPassMaskProgram* GLRenderer::GetRenderPassMaskProgram(
3037     TexCoordPrecision precision,
3038     SamplerType sampler,
3039     BlendMode blend_mode,
3040     bool mask_for_background) {
3041   DCHECK_GE(precision, 0);
3042   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3043   DCHECK_GE(sampler, 0);
3044   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3045   DCHECK_GE(blend_mode, 0);
3046   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3047   RenderPassMaskProgram* program =
3048       &render_pass_mask_program_[precision][sampler][blend_mode]
3049                                 [mask_for_background ? HAS_MASK : NO_MASK];
3050   if (!program->initialized()) {
3051     TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgram::initialize");
3052     program->Initialize(
3053         output_surface_->context_provider(), precision,
3054         sampler, blend_mode, mask_for_background);
3055   }
3056   return program;
3057 }
3058
3059 const GLRenderer::RenderPassMaskProgramAA*
3060 GLRenderer::GetRenderPassMaskProgramAA(TexCoordPrecision precision,
3061                                        SamplerType sampler,
3062                                        BlendMode blend_mode,
3063                                        bool mask_for_background) {
3064   DCHECK_GE(precision, 0);
3065   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3066   DCHECK_GE(sampler, 0);
3067   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3068   DCHECK_GE(blend_mode, 0);
3069   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3070   RenderPassMaskProgramAA* program =
3071       &render_pass_mask_program_aa_[precision][sampler][blend_mode]
3072                                    [mask_for_background ? HAS_MASK : NO_MASK];
3073   if (!program->initialized()) {
3074     TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgramAA::initialize");
3075     program->Initialize(
3076         output_surface_->context_provider(), precision,
3077         sampler, blend_mode, mask_for_background);
3078   }
3079   return program;
3080 }
3081
3082 const GLRenderer::RenderPassColorMatrixProgram*
3083 GLRenderer::GetRenderPassColorMatrixProgram(TexCoordPrecision precision,
3084                                             BlendMode blend_mode) {
3085   DCHECK_GE(precision, 0);
3086   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3087   DCHECK_GE(blend_mode, 0);
3088   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3089   RenderPassColorMatrixProgram* program =
3090       &render_pass_color_matrix_program_[precision][blend_mode];
3091   if (!program->initialized()) {
3092     TRACE_EVENT0("cc", "GLRenderer::renderPassColorMatrixProgram::initialize");
3093     program->Initialize(output_surface_->context_provider(), precision,
3094                         SAMPLER_TYPE_2D, blend_mode);
3095   }
3096   return program;
3097 }
3098
3099 const GLRenderer::RenderPassColorMatrixProgramAA*
3100 GLRenderer::GetRenderPassColorMatrixProgramAA(TexCoordPrecision precision,
3101                                               BlendMode blend_mode) {
3102   DCHECK_GE(precision, 0);
3103   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3104   DCHECK_GE(blend_mode, 0);
3105   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3106   RenderPassColorMatrixProgramAA* program =
3107       &render_pass_color_matrix_program_aa_[precision][blend_mode];
3108   if (!program->initialized()) {
3109     TRACE_EVENT0("cc",
3110                  "GLRenderer::renderPassColorMatrixProgramAA::initialize");
3111     program->Initialize(output_surface_->context_provider(), precision,
3112                         SAMPLER_TYPE_2D, blend_mode);
3113   }
3114   return program;
3115 }
3116
3117 const GLRenderer::RenderPassMaskColorMatrixProgram*
3118 GLRenderer::GetRenderPassMaskColorMatrixProgram(
3119     TexCoordPrecision precision,
3120     SamplerType sampler,
3121     BlendMode blend_mode,
3122     bool mask_for_background) {
3123   DCHECK_GE(precision, 0);
3124   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3125   DCHECK_GE(sampler, 0);
3126   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3127   DCHECK_GE(blend_mode, 0);
3128   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3129   RenderPassMaskColorMatrixProgram* program =
3130       &render_pass_mask_color_matrix_program_[precision][sampler][blend_mode]
3131           [mask_for_background ? HAS_MASK : NO_MASK];
3132   if (!program->initialized()) {
3133     TRACE_EVENT0("cc",
3134                  "GLRenderer::renderPassMaskColorMatrixProgram::initialize");
3135     program->Initialize(
3136         output_surface_->context_provider(), precision,
3137         sampler, blend_mode, mask_for_background);
3138   }
3139   return program;
3140 }
3141
3142 const GLRenderer::RenderPassMaskColorMatrixProgramAA*
3143 GLRenderer::GetRenderPassMaskColorMatrixProgramAA(
3144     TexCoordPrecision precision,
3145     SamplerType sampler,
3146     BlendMode blend_mode,
3147     bool mask_for_background) {
3148   DCHECK_GE(precision, 0);
3149   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3150   DCHECK_GE(sampler, 0);
3151   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3152   DCHECK_GE(blend_mode, 0);
3153   DCHECK_LE(blend_mode, LAST_BLEND_MODE);
3154   RenderPassMaskColorMatrixProgramAA* program =
3155       &render_pass_mask_color_matrix_program_aa_[precision][sampler][blend_mode]
3156           [mask_for_background ? HAS_MASK : NO_MASK];
3157   if (!program->initialized()) {
3158     TRACE_EVENT0("cc",
3159                  "GLRenderer::renderPassMaskColorMatrixProgramAA::initialize");
3160     program->Initialize(
3161         output_surface_->context_provider(), precision,
3162         sampler, blend_mode, mask_for_background);
3163   }
3164   return program;
3165 }
3166
3167 const GLRenderer::TileProgram* GLRenderer::GetTileProgram(
3168     TexCoordPrecision precision,
3169     SamplerType sampler) {
3170   DCHECK_GE(precision, 0);
3171   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3172   DCHECK_GE(sampler, 0);
3173   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3174   TileProgram* program = &tile_program_[precision][sampler];
3175   if (!program->initialized()) {
3176     TRACE_EVENT0("cc", "GLRenderer::tileProgram::initialize");
3177     program->Initialize(
3178         output_surface_->context_provider(), precision, sampler);
3179   }
3180   return program;
3181 }
3182
3183 const GLRenderer::TileProgramOpaque* GLRenderer::GetTileProgramOpaque(
3184     TexCoordPrecision precision,
3185     SamplerType sampler) {
3186   DCHECK_GE(precision, 0);
3187   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3188   DCHECK_GE(sampler, 0);
3189   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3190   TileProgramOpaque* program = &tile_program_opaque_[precision][sampler];
3191   if (!program->initialized()) {
3192     TRACE_EVENT0("cc", "GLRenderer::tileProgramOpaque::initialize");
3193     program->Initialize(
3194         output_surface_->context_provider(), precision, sampler);
3195   }
3196   return program;
3197 }
3198
3199 const GLRenderer::TileProgramAA* GLRenderer::GetTileProgramAA(
3200     TexCoordPrecision precision,
3201     SamplerType sampler) {
3202   DCHECK_GE(precision, 0);
3203   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3204   DCHECK_GE(sampler, 0);
3205   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3206   TileProgramAA* program = &tile_program_aa_[precision][sampler];
3207   if (!program->initialized()) {
3208     TRACE_EVENT0("cc", "GLRenderer::tileProgramAA::initialize");
3209     program->Initialize(
3210         output_surface_->context_provider(), precision, sampler);
3211   }
3212   return program;
3213 }
3214
3215 const GLRenderer::TileProgramSwizzle* GLRenderer::GetTileProgramSwizzle(
3216     TexCoordPrecision precision,
3217     SamplerType sampler) {
3218   DCHECK_GE(precision, 0);
3219   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3220   DCHECK_GE(sampler, 0);
3221   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3222   TileProgramSwizzle* program = &tile_program_swizzle_[precision][sampler];
3223   if (!program->initialized()) {
3224     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzle::initialize");
3225     program->Initialize(
3226         output_surface_->context_provider(), precision, sampler);
3227   }
3228   return program;
3229 }
3230
3231 const GLRenderer::TileProgramSwizzleOpaque*
3232 GLRenderer::GetTileProgramSwizzleOpaque(TexCoordPrecision precision,
3233                                         SamplerType sampler) {
3234   DCHECK_GE(precision, 0);
3235   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3236   DCHECK_GE(sampler, 0);
3237   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3238   TileProgramSwizzleOpaque* program =
3239       &tile_program_swizzle_opaque_[precision][sampler];
3240   if (!program->initialized()) {
3241     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleOpaque::initialize");
3242     program->Initialize(
3243         output_surface_->context_provider(), precision, sampler);
3244   }
3245   return program;
3246 }
3247
3248 const GLRenderer::TileProgramSwizzleAA* GLRenderer::GetTileProgramSwizzleAA(
3249     TexCoordPrecision precision,
3250     SamplerType sampler) {
3251   DCHECK_GE(precision, 0);
3252   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3253   DCHECK_GE(sampler, 0);
3254   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3255   TileProgramSwizzleAA* program = &tile_program_swizzle_aa_[precision][sampler];
3256   if (!program->initialized()) {
3257     TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleAA::initialize");
3258     program->Initialize(
3259         output_surface_->context_provider(), precision, sampler);
3260   }
3261   return program;
3262 }
3263
3264 const GLRenderer::TextureProgram* GLRenderer::GetTextureProgram(
3265     TexCoordPrecision precision,
3266     SamplerType sampler) {
3267   DCHECK_GE(precision, 0);
3268   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3269   DCHECK_GE(sampler, 0);
3270   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3271   TextureProgram* program = &texture_program_[precision][sampler];
3272   if (!program->initialized()) {
3273     TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
3274     program->Initialize(output_surface_->context_provider(), precision,
3275                         sampler);
3276   }
3277   return program;
3278 }
3279
3280 const GLRenderer::NonPremultipliedTextureProgram*
3281 GLRenderer::GetNonPremultipliedTextureProgram(TexCoordPrecision precision,
3282                                               SamplerType sampler) {
3283   DCHECK_GE(precision, 0);
3284   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3285   DCHECK_GE(sampler, 0);
3286   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3287   NonPremultipliedTextureProgram* program =
3288       &nonpremultiplied_texture_program_[precision][sampler];
3289   if (!program->initialized()) {
3290     TRACE_EVENT0("cc",
3291                  "GLRenderer::NonPremultipliedTextureProgram::Initialize");
3292     program->Initialize(output_surface_->context_provider(), precision,
3293                         sampler);
3294   }
3295   return program;
3296 }
3297
3298 const GLRenderer::TextureBackgroundProgram*
3299 GLRenderer::GetTextureBackgroundProgram(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   TextureBackgroundProgram* program =
3306       &texture_background_program_[precision][sampler];
3307   if (!program->initialized()) {
3308     TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
3309     program->Initialize(output_surface_->context_provider(), precision,
3310                         sampler);
3311   }
3312   return program;
3313 }
3314
3315 const GLRenderer::NonPremultipliedTextureBackgroundProgram*
3316 GLRenderer::GetNonPremultipliedTextureBackgroundProgram(
3317     TexCoordPrecision precision,
3318     SamplerType sampler) {
3319   DCHECK_GE(precision, 0);
3320   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3321   DCHECK_GE(sampler, 0);
3322   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3323   NonPremultipliedTextureBackgroundProgram* program =
3324       &nonpremultiplied_texture_background_program_[precision][sampler];
3325   if (!program->initialized()) {
3326     TRACE_EVENT0("cc",
3327                  "GLRenderer::NonPremultipliedTextureProgram::Initialize");
3328     program->Initialize(output_surface_->context_provider(), precision,
3329                         sampler);
3330   }
3331   return program;
3332 }
3333
3334 const GLRenderer::TextureProgram* GLRenderer::GetTextureIOSurfaceProgram(
3335     TexCoordPrecision precision) {
3336   DCHECK_GE(precision, 0);
3337   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3338   TextureProgram* program = &texture_io_surface_program_[precision];
3339   if (!program->initialized()) {
3340     TRACE_EVENT0("cc", "GLRenderer::textureIOSurfaceProgram::initialize");
3341     program->Initialize(output_surface_->context_provider(), precision,
3342                         SAMPLER_TYPE_2D_RECT);
3343   }
3344   return program;
3345 }
3346
3347 const GLRenderer::VideoYUVProgram* GLRenderer::GetVideoYUVProgram(
3348     TexCoordPrecision precision,
3349     SamplerType sampler) {
3350   DCHECK_GE(precision, 0);
3351   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3352   DCHECK_GE(sampler, 0);
3353   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3354   VideoYUVProgram* program = &video_yuv_program_[precision][sampler];
3355   if (!program->initialized()) {
3356     TRACE_EVENT0("cc", "GLRenderer::videoYUVProgram::initialize");
3357     program->Initialize(output_surface_->context_provider(), precision,
3358                         sampler);
3359   }
3360   return program;
3361 }
3362
3363 const GLRenderer::VideoYUVAProgram* GLRenderer::GetVideoYUVAProgram(
3364     TexCoordPrecision precision,
3365     SamplerType sampler) {
3366   DCHECK_GE(precision, 0);
3367   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3368   DCHECK_GE(sampler, 0);
3369   DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
3370   VideoYUVAProgram* program = &video_yuva_program_[precision][sampler];
3371   if (!program->initialized()) {
3372     TRACE_EVENT0("cc", "GLRenderer::videoYUVAProgram::initialize");
3373     program->Initialize(output_surface_->context_provider(), precision,
3374                         sampler);
3375   }
3376   return program;
3377 }
3378
3379 const GLRenderer::VideoStreamTextureProgram*
3380 GLRenderer::GetVideoStreamTextureProgram(TexCoordPrecision precision) {
3381   if (!Capabilities().using_egl_image)
3382     return NULL;
3383   DCHECK_GE(precision, 0);
3384   DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
3385   VideoStreamTextureProgram* program =
3386       &video_stream_texture_program_[precision];
3387   if (!program->initialized()) {
3388     TRACE_EVENT0("cc", "GLRenderer::streamTextureProgram::initialize");
3389     program->Initialize(output_surface_->context_provider(), precision,
3390                         SAMPLER_TYPE_EXTERNAL_OES);
3391   }
3392   return program;
3393 }
3394
3395 void GLRenderer::CleanupSharedObjects() {
3396   shared_geometry_ = nullptr;
3397
3398   for (int i = 0; i <= LAST_TEX_COORD_PRECISION; ++i) {
3399     for (int j = 0; j <= LAST_SAMPLER_TYPE; ++j) {
3400       tile_program_[i][j].Cleanup(gl_);
3401       tile_program_opaque_[i][j].Cleanup(gl_);
3402       tile_program_swizzle_[i][j].Cleanup(gl_);
3403       tile_program_swizzle_opaque_[i][j].Cleanup(gl_);
3404       tile_program_aa_[i][j].Cleanup(gl_);
3405       tile_program_swizzle_aa_[i][j].Cleanup(gl_);
3406
3407       for (int k = 0; k <= LAST_BLEND_MODE; k++) {
3408         for (int l = 0; l <= LAST_MASK_VALUE; ++l) {
3409           render_pass_mask_program_[i][j][k][l].Cleanup(gl_);
3410           render_pass_mask_program_aa_[i][j][k][l].Cleanup(gl_);
3411           render_pass_mask_color_matrix_program_aa_[i][j][k][l].Cleanup(gl_);
3412           render_pass_mask_color_matrix_program_[i][j][k][l].Cleanup(gl_);
3413         }
3414       }
3415
3416       video_yuv_program_[i][j].Cleanup(gl_);
3417       video_yuva_program_[i][j].Cleanup(gl_);
3418     }
3419     for (int j = 0; j <= LAST_BLEND_MODE; j++) {
3420       render_pass_program_[i][j].Cleanup(gl_);
3421       render_pass_program_aa_[i][j].Cleanup(gl_);
3422       render_pass_color_matrix_program_[i][j].Cleanup(gl_);
3423       render_pass_color_matrix_program_aa_[i][j].Cleanup(gl_);
3424     }
3425
3426     for (int j = 0; j <= LAST_SAMPLER_TYPE; ++j) {
3427       texture_program_[i][j].Cleanup(gl_);
3428       nonpremultiplied_texture_program_[i][j].Cleanup(gl_);
3429       texture_background_program_[i][j].Cleanup(gl_);
3430       nonpremultiplied_texture_background_program_[i][j].Cleanup(gl_);
3431     }
3432     texture_io_surface_program_[i].Cleanup(gl_);
3433
3434     video_stream_texture_program_[i].Cleanup(gl_);
3435   }
3436
3437   debug_border_program_.Cleanup(gl_);
3438   solid_color_program_.Cleanup(gl_);
3439   solid_color_program_aa_.Cleanup(gl_);
3440
3441   if (offscreen_framebuffer_id_)
3442     gl_->DeleteFramebuffers(1, &offscreen_framebuffer_id_);
3443
3444   if (on_demand_tile_raster_resource_id_)
3445     resource_provider_->DeleteResource(on_demand_tile_raster_resource_id_);
3446
3447   ReleaseRenderPassTextures();
3448 }
3449
3450 void GLRenderer::ReinitializeGLState() {
3451   is_scissor_enabled_ = false;
3452   scissor_rect_needs_reset_ = true;
3453   stencil_shadow_ = false;
3454   blend_shadow_ = true;
3455   program_shadow_ = 0;
3456
3457   RestoreGLState();
3458 }
3459
3460 void GLRenderer::RestoreGLState() {
3461   // This restores the current GLRenderer state to the GL context.
3462   bound_geometry_ = NO_BINDING;
3463   PrepareGeometry(SHARED_BINDING);
3464
3465   gl_->Disable(GL_DEPTH_TEST);
3466   gl_->Disable(GL_CULL_FACE);
3467   gl_->ColorMask(true, true, true, true);
3468   gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
3469   gl_->ActiveTexture(GL_TEXTURE0);
3470
3471   if (program_shadow_)
3472     gl_->UseProgram(program_shadow_);
3473
3474   if (stencil_shadow_)
3475     gl_->Enable(GL_STENCIL_TEST);
3476   else
3477     gl_->Disable(GL_STENCIL_TEST);
3478
3479   if (blend_shadow_)
3480     gl_->Enable(GL_BLEND);
3481   else
3482     gl_->Disable(GL_BLEND);
3483
3484   if (is_scissor_enabled_) {
3485     gl_->Enable(GL_SCISSOR_TEST);
3486     gl_->Scissor(scissor_rect_.x(), scissor_rect_.y(), scissor_rect_.width(),
3487                  scissor_rect_.height());
3488   } else {
3489     gl_->Disable(GL_SCISSOR_TEST);
3490   }
3491 }
3492
3493 void GLRenderer::RestoreFramebuffer(DrawingFrame* frame) {
3494   UseRenderPass(frame, frame->current_render_pass);
3495
3496   // Call SetViewport directly, rather than through PrepareSurfaceForPass.
3497   // PrepareSurfaceForPass also clears the surface, which is not desired when
3498   // restoring.
3499   SetViewport();
3500 }
3501
3502 bool GLRenderer::IsContextLost() {
3503   return gl_->GetGraphicsResetStatusKHR() != GL_NO_ERROR;
3504 }
3505
3506 void GLRenderer::ScheduleOverlays(DrawingFrame* frame) {
3507   if (!frame->overlay_list.size())
3508     return;
3509
3510   ResourceProvider::ResourceIdArray resources;
3511   OverlayCandidateList& overlays = frame->overlay_list;
3512   for (const OverlayCandidate& overlay : overlays) {
3513     // Skip primary plane.
3514     if (overlay.plane_z_order == 0)
3515       continue;
3516
3517     unsigned texture_id = 0;
3518     if (overlay.use_output_surface_for_resource) {
3519       texture_id = output_surface_->GetOverlayTextureId();
3520       DCHECK(texture_id);
3521     } else {
3522       pending_overlay_resources_.push_back(
3523           make_scoped_ptr(new ResourceProvider::ScopedReadLockGL(
3524               resource_provider_, overlay.resource_id)));
3525       texture_id = pending_overlay_resources_.back()->texture_id();
3526     }
3527
3528     context_support_->ScheduleOverlayPlane(
3529         overlay.plane_z_order, overlay.transform, texture_id,
3530         ToNearestRect(overlay.display_rect), overlay.uv_rect);
3531   }
3532 }
3533
3534 }  // namespace cc