android_webview/browser/scoped_app_gl_state_restore.cc

   1 // Copyright 2013 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 "android_webview/browser/scoped_app_gl_state_restore.h"
   6
   7 #include <string>
   8
   9 #include "base/debug/trace_event.h"
  10 #include "base/lazy_instance.h"
  11 #include "ui/gl/gl_bindings.h"
  12 #include "ui/gl/gl_context.h"
  13 #include "ui/gl/gl_surface_stub.h"
  14
  15 namespace android_webview {
  16
  17 namespace {
  18
  19 // "App" context is a bit of a stretch. Basically we use this context while
  20 // saving and restoring the App GL state.
  21 class AppContextSurface {
  22  public:
  23   AppContextSurface()
  24       : surface(new gfx::GLSurfaceStub),
  25         context(gfx::GLContext::CreateGLContext(NULL,
  26                                                 surface.get(),
  27                                                 gfx::PreferDiscreteGpu)) {}
  28   void MakeCurrent() { context->MakeCurrent(surface.get()); }
  29
  30  private:
  31   scoped_refptr<gfx::GLSurfaceStub> surface;
  32   scoped_refptr<gfx::GLContext> context;
  33
  34   DISALLOW_COPY_AND_ASSIGN(AppContextSurface);
  35 };
  36
  37 base::LazyInstance<AppContextSurface> g_app_context_surface =
  38     LAZY_INSTANCE_INITIALIZER;
  39
  40 // Make the global g_app_context_surface current so that the gl_binding is not
  41 // NULL for making gl* calls. The binding can be null if another GlContext was
  42 // destroyed immediately before gl* calls here.
  43 void MakeAppContextCurrent() {
  44   g_app_context_surface.Get().MakeCurrent();
  45 }
  46
  47 void GLEnableDisable(GLenum cap, bool enable) {
  48   if (enable)
  49     glEnable(cap);
  50   else
  51     glDisable(cap);
  52 }
  53
  54 bool ClearGLErrors(bool warn, const char* msg) {
  55   bool no_error = true;
  56   GLenum error;
  57   while ((error = glGetError()) != GL_NO_ERROR) {
  58     DLOG_IF(WARNING, warn) << error << " " << msg;
  59     no_error = false;
  60   }
  61
  62   return no_error;
  63 }
  64
  65 bool g_globals_initialized = false;
  66 GLint g_gl_max_texture_units = 0;
  67 bool g_supports_oes_vertex_array_object = false;
  68
  69 }  // namespace
  70
  71 namespace internal {
  72
  73 class ScopedAppGLStateRestoreImpl {
  74  public:
  75   ScopedAppGLStateRestoreImpl(ScopedAppGLStateRestore::CallMode mode);
  76   ~ScopedAppGLStateRestoreImpl();
  77
  78   bool stencil_enabled() const { return stencil_test_; }
  79   GLint framebuffer_binding_ext() const { return framebuffer_binding_ext_; }
  80
  81  private:
  82   const ScopedAppGLStateRestore::CallMode mode_;
  83
  84   GLint pack_alignment_;
  85   GLint unpack_alignment_;
  86
  87   struct {
  88     GLint enabled;
  89     GLint size;
  90     GLint type;
  91     GLint normalized;
  92     GLint stride;
  93     GLvoid* pointer;
  94     GLint vertex_attrib_array_buffer_binding;
  95     GLfloat current_vertex_attrib[4];
  96   } vertex_attrib_[3];
  97
  98   GLint vertex_array_buffer_binding_;
  99   GLint index_array_buffer_binding_;
 100
 101   GLboolean depth_test_;
 102   GLboolean cull_face_;
 103   GLint cull_face_mode_;
 104   GLboolean color_mask_[4];
 105   GLfloat color_clear_[4];
 106   GLfloat blend_color_[4];
 107   GLfloat depth_clear_;
 108   GLint current_program_;
 109   GLint depth_func_;
 110   GLboolean depth_mask_;
 111   GLfloat depth_rage_[2];
 112   GLint front_face_;
 113   GLint hint_generate_mipmap_;
 114   GLfloat line_width_;
 115   GLfloat polygon_offset_factor_;
 116   GLfloat polygon_offset_units_;
 117   GLfloat sample_coverage_value_;
 118   GLboolean sample_coverage_invert_;
 119   GLint blend_equation_rgb_;
 120   GLint blend_equation_alpha_;
 121
 122   GLboolean enable_dither_;
 123   GLboolean enable_polygon_offset_fill_;
 124   GLboolean enable_sample_alpha_to_coverage_;
 125   GLboolean enable_sample_coverage_;
 126
 127   // Not saved/restored in MODE_DRAW.
 128   GLboolean blend_enabled_;
 129   GLint blend_src_rgb_;
 130   GLint blend_src_alpha_;
 131   GLint blend_dest_rgb_;
 132   GLint blend_dest_alpha_;
 133   GLint active_texture_;
 134   GLint viewport_[4];
 135   GLboolean scissor_test_;
 136   GLint scissor_box_[4];
 137
 138   GLboolean stencil_test_;
 139   GLint stencil_front_func_;
 140   GLint stencil_front_ref_;
 141   GLint stencil_front_mask_;
 142   GLint stencil_back_func_;
 143   GLint stencil_back_ref_;
 144   GLint stencil_back_mask_;
 145   GLint stencil_clear_;
 146   GLint stencil_front_writemask_;
 147   GLint stencil_back_writemask_;
 148   GLint stencil_front_fail_op_;
 149   GLint stencil_front_z_fail_op_;
 150   GLint stencil_front_z_pass_op_;
 151   GLint stencil_back_fail_op_;
 152   GLint stencil_back_z_fail_op_;
 153   GLint stencil_back_z_pass_op_;
 154
 155   GLint framebuffer_binding_ext_;
 156
 157   struct TextureBindings {
 158     GLint texture_2d;
 159     GLint texture_cube_map;
 160     GLint texture_external_oes;
 161     // TODO(boliu): TEXTURE_RECTANGLE_ARB
 162   };
 163
 164   std::vector<TextureBindings> texture_bindings_;
 165
 166   GLint vertex_array_bindings_oes_;
 167
 168   DISALLOW_COPY_AND_ASSIGN(ScopedAppGLStateRestoreImpl);
 169 };
 170
 171 ScopedAppGLStateRestoreImpl::ScopedAppGLStateRestoreImpl(
 172     ScopedAppGLStateRestore::CallMode mode)
 173     : mode_(mode) {
 174   TRACE_EVENT0("android_webview", "AppGLStateSave");
 175   MakeAppContextCurrent();
 176
 177   ClearGLErrors(true, "Incoming GLError");
 178
 179   if (!g_globals_initialized) {
 180     g_globals_initialized = true;
 181
 182     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &g_gl_max_texture_units);
 183     DCHECK_GT(g_gl_max_texture_units, 0);
 184
 185     std::string extensions(
 186         reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));
 187     g_supports_oes_vertex_array_object =
 188         extensions.find("GL_OES_vertex_array_object") != std::string::npos;
 189   }
 190
 191   glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &vertex_array_buffer_binding_);
 192   glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &index_array_buffer_binding_);
 193
 194   switch(mode_) {
 195     case ScopedAppGLStateRestore::MODE_DRAW:
 196       DCHECK_EQ(0, vertex_array_buffer_binding_);
 197       DCHECK_EQ(0, index_array_buffer_binding_);
 198       break;
 199     case ScopedAppGLStateRestore::MODE_RESOURCE_MANAGEMENT:
 200       glGetBooleanv(GL_BLEND, &blend_enabled_);
 201       glGetIntegerv(GL_BLEND_SRC_RGB, &blend_src_rgb_);
 202       glGetIntegerv(GL_BLEND_SRC_ALPHA, &blend_src_alpha_);
 203       glGetIntegerv(GL_BLEND_DST_RGB, &blend_dest_rgb_);
 204       glGetIntegerv(GL_BLEND_DST_ALPHA, &blend_dest_alpha_);
 205       glGetIntegerv(GL_VIEWPORT, viewport_);
 206       glGetBooleanv(GL_SCISSOR_TEST, &scissor_test_);
 207       glGetIntegerv(GL_SCISSOR_BOX, scissor_box_);
 208       break;
 209   }
 210
 211   glGetIntegerv(GL_PACK_ALIGNMENT, &pack_alignment_);
 212   glGetIntegerv(GL_UNPACK_ALIGNMENT, &unpack_alignment_);
 213
 214   glGetBooleanv(GL_DEPTH_TEST, &depth_test_);
 215   glGetBooleanv(GL_CULL_FACE, &cull_face_);
 216   glGetIntegerv(GL_CULL_FACE_MODE, &cull_face_mode_);
 217   glGetBooleanv(GL_COLOR_WRITEMASK, color_mask_);
 218   glGetIntegerv(GL_CURRENT_PROGRAM, &current_program_);
 219   glGetFloatv(GL_COLOR_CLEAR_VALUE, color_clear_);
 220   glGetFloatv(GL_DEPTH_CLEAR_VALUE, &depth_clear_);
 221   glGetFloatv(GL_BLEND_COLOR, blend_color_);
 222   glGetIntegerv(GL_DEPTH_FUNC, &depth_func_);
 223   glGetBooleanv(GL_DEPTH_WRITEMASK, &depth_mask_);
 224   glGetFloatv(GL_DEPTH_RANGE, depth_rage_);
 225   glGetIntegerv(GL_FRONT_FACE, &front_face_);
 226   glGetIntegerv(GL_GENERATE_MIPMAP_HINT, &hint_generate_mipmap_);
 227   glGetFloatv(GL_LINE_WIDTH, &line_width_);
 228   glGetFloatv(GL_POLYGON_OFFSET_FACTOR, &polygon_offset_factor_);
 229   glGetFloatv(GL_POLYGON_OFFSET_UNITS, &polygon_offset_units_);
 230   glGetFloatv(GL_SAMPLE_COVERAGE_VALUE, &sample_coverage_value_);
 231   glGetBooleanv(GL_SAMPLE_COVERAGE_INVERT, &sample_coverage_invert_);
 232   glGetIntegerv(GL_BLEND_EQUATION_RGB, &blend_equation_rgb_);
 233   glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &blend_equation_alpha_);
 234
 235   glGetBooleanv(GL_DITHER, &enable_dither_);
 236   glGetBooleanv(GL_POLYGON_OFFSET_FILL, &enable_polygon_offset_fill_);
 237   glGetBooleanv(GL_SAMPLE_ALPHA_TO_COVERAGE, &enable_sample_alpha_to_coverage_);
 238   glGetBooleanv(GL_SAMPLE_COVERAGE, &enable_sample_coverage_);
 239
 240   glGetBooleanv(GL_STENCIL_TEST, &stencil_test_);
 241   glGetIntegerv(GL_STENCIL_FUNC, &stencil_front_func_);
 242   glGetIntegerv(GL_STENCIL_VALUE_MASK, &stencil_front_mask_);
 243   glGetIntegerv(GL_STENCIL_REF, &stencil_front_ref_);
 244   glGetIntegerv(GL_STENCIL_BACK_FUNC, &stencil_back_func_);
 245   glGetIntegerv(GL_STENCIL_BACK_VALUE_MASK, &stencil_back_mask_);
 246   glGetIntegerv(GL_STENCIL_BACK_REF, &stencil_back_ref_);
 247   glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &stencil_clear_);
 248   glGetIntegerv(GL_STENCIL_WRITEMASK, &stencil_front_writemask_);
 249   glGetIntegerv(GL_STENCIL_BACK_WRITEMASK, &stencil_back_writemask_);
 250   glGetIntegerv(GL_STENCIL_FAIL, &stencil_front_fail_op_);
 251   glGetIntegerv(GL_STENCIL_PASS_DEPTH_FAIL, &stencil_front_z_fail_op_);
 252   glGetIntegerv(GL_STENCIL_PASS_DEPTH_PASS, &stencil_front_z_pass_op_);
 253   glGetIntegerv(GL_STENCIL_BACK_FAIL, &stencil_back_fail_op_);
 254   glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_FAIL, &stencil_back_z_fail_op_);
 255   glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_PASS, &stencil_back_z_pass_op_);
 256
 257   glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &framebuffer_binding_ext_);
 258
 259   glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture_);
 260
 261   texture_bindings_.resize(g_gl_max_texture_units);
 262   for (int ii = 0; ii < g_gl_max_texture_units; ++ii) {
 263     glActiveTexture(GL_TEXTURE0 + ii);
 264     TextureBindings& bindings = texture_bindings_[ii];
 265     glGetIntegerv(GL_TEXTURE_BINDING_2D, &bindings.texture_2d);
 266     glGetIntegerv(GL_TEXTURE_BINDING_CUBE_MAP, &bindings.texture_cube_map);
 267     glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES,
 268                   &bindings.texture_external_oes);
 269   }
 270
 271   if (g_supports_oes_vertex_array_object) {
 272     glGetIntegerv(GL_VERTEX_ARRAY_BINDING_OES, &vertex_array_bindings_oes_);
 273     glBindVertexArrayOES(0);
 274   }
 275
 276   for (size_t i = 0; i < arraysize(vertex_attrib_); ++i) {
 277     glGetVertexAttribiv(
 278         i, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &vertex_attrib_[i].enabled);
 279     glGetVertexAttribiv(
 280         i, GL_VERTEX_ATTRIB_ARRAY_SIZE, &vertex_attrib_[i].size);
 281     glGetVertexAttribiv(
 282         i, GL_VERTEX_ATTRIB_ARRAY_TYPE, &vertex_attrib_[i].type);
 283     glGetVertexAttribiv(
 284         i, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, &vertex_attrib_[i].normalized);
 285     glGetVertexAttribiv(
 286         i, GL_VERTEX_ATTRIB_ARRAY_STRIDE, &vertex_attrib_[i].stride);
 287     glGetVertexAttribPointerv(
 288         i, GL_VERTEX_ATTRIB_ARRAY_POINTER, &vertex_attrib_[i].pointer);
 289     glGetVertexAttribPointerv(
 290         i, GL_VERTEX_ATTRIB_ARRAY_POINTER, &vertex_attrib_[i].pointer);
 291     glGetVertexAttribiv(i,
 292                         GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING,
 293                         &vertex_attrib_[i].vertex_attrib_array_buffer_binding);
 294     glGetVertexAttribfv(
 295         i, GL_CURRENT_VERTEX_ATTRIB, vertex_attrib_[i].current_vertex_attrib);
 296   }
 297   DCHECK(ClearGLErrors(false, NULL));
 298 }
 299
 300 ScopedAppGLStateRestoreImpl::~ScopedAppGLStateRestoreImpl() {
 301   TRACE_EVENT0("android_webview", "AppGLStateRestore");
 302   MakeAppContextCurrent();
 303
 304   DCHECK(ClearGLErrors(false, NULL));
 305
 306   glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer_binding_ext_);
 307   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_array_buffer_binding_);
 308
 309   if (g_supports_oes_vertex_array_object)
 310     glBindVertexArrayOES(0);
 311
 312   for (size_t i = 0; i < arraysize(vertex_attrib_); ++i) {
 313     glBindBuffer(GL_ARRAY_BUFFER,
 314                  vertex_attrib_[i].vertex_attrib_array_buffer_binding);
 315     glVertexAttribPointer(i,
 316                           vertex_attrib_[i].size,
 317                           vertex_attrib_[i].type,
 318                           vertex_attrib_[i].normalized,
 319                           vertex_attrib_[i].stride,
 320                           vertex_attrib_[i].pointer);
 321
 322     glVertexAttrib4fv(i, vertex_attrib_[i].current_vertex_attrib);
 323
 324     if (vertex_attrib_[i].enabled) {
 325       glEnableVertexAttribArray(i);
 326     } else {
 327       glDisableVertexAttribArray(i);
 328     }
 329   }
 330
 331   if (g_supports_oes_vertex_array_object && vertex_array_bindings_oes_ != 0)
 332     glBindVertexArrayOES(vertex_array_bindings_oes_);
 333
 334   glBindBuffer(GL_ARRAY_BUFFER, vertex_array_buffer_binding_);
 335
 336   for (int ii = 0; ii < g_gl_max_texture_units; ++ii) {
 337     glActiveTexture(GL_TEXTURE0 + ii);
 338     TextureBindings& bindings = texture_bindings_[ii];
 339     glBindTexture(GL_TEXTURE_2D, bindings.texture_2d);
 340     glBindTexture(GL_TEXTURE_CUBE_MAP, bindings.texture_cube_map);
 341     glBindTexture(GL_TEXTURE_EXTERNAL_OES, bindings.texture_external_oes);
 342   }
 343   glActiveTexture(active_texture_);
 344
 345   glPixelStorei(GL_PACK_ALIGNMENT, pack_alignment_);
 346   glPixelStorei(GL_UNPACK_ALIGNMENT, unpack_alignment_);
 347
 348   GLEnableDisable(GL_DEPTH_TEST, depth_test_);
 349
 350   GLEnableDisable(GL_CULL_FACE, cull_face_);
 351   glCullFace(cull_face_mode_);
 352
 353   glColorMask(color_mask_[0], color_mask_[1], color_mask_[2], color_mask_[3]);
 354
 355   glUseProgram(current_program_);
 356
 357   glClearColor(
 358       color_clear_[0], color_clear_[1], color_clear_[2], color_clear_[3]);
 359   glBlendColor(
 360       blend_color_[0], blend_color_[1], blend_color_[2], blend_color_[3]);
 361   glClearDepth(depth_clear_);
 362   glDepthFunc(depth_func_);
 363   glDepthMask(depth_mask_);
 364   glDepthRange(depth_rage_[0], depth_rage_[1]);
 365   glFrontFace(front_face_);
 366   glHint(GL_GENERATE_MIPMAP_HINT, hint_generate_mipmap_);
 367   // TODO(boliu): GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES ??
 368   glLineWidth(line_width_);
 369   glPolygonOffset(polygon_offset_factor_, polygon_offset_units_);
 370   glSampleCoverage(sample_coverage_value_, sample_coverage_invert_);
 371   glBlendEquationSeparate(blend_equation_rgb_, blend_equation_alpha_);
 372
 373   GLEnableDisable(GL_DITHER, enable_dither_);
 374   GLEnableDisable(GL_POLYGON_OFFSET_FILL, enable_polygon_offset_fill_);
 375   GLEnableDisable(GL_SAMPLE_ALPHA_TO_COVERAGE,
 376                   enable_sample_alpha_to_coverage_);
 377   GLEnableDisable(GL_SAMPLE_COVERAGE, enable_sample_coverage_);
 378
 379   switch(mode_) {
 380     case ScopedAppGLStateRestore::MODE_DRAW:
 381       // No-op.
 382       break;
 383     case ScopedAppGLStateRestore::MODE_RESOURCE_MANAGEMENT:
 384       GLEnableDisable(GL_BLEND, blend_enabled_);
 385       glBlendFuncSeparate(
 386           blend_src_rgb_, blend_dest_rgb_, blend_src_alpha_, blend_dest_alpha_);
 387
 388       glViewport(viewport_[0], viewport_[1], viewport_[2], viewport_[3]);
 389
 390       GLEnableDisable(GL_SCISSOR_TEST, scissor_test_);
 391
 392       glScissor(
 393           scissor_box_[0], scissor_box_[1], scissor_box_[2], scissor_box_[3]);
 394       break;
 395   }
 396
 397   GLEnableDisable(GL_STENCIL_TEST, stencil_test_);
 398   glStencilFuncSeparate(
 399       GL_FRONT, stencil_front_func_, stencil_front_mask_, stencil_front_ref_);
 400   glStencilFuncSeparate(
 401       GL_BACK, stencil_back_func_, stencil_back_mask_, stencil_back_ref_);
 402   glClearStencil(stencil_clear_);
 403   glStencilMaskSeparate(GL_FRONT, stencil_front_writemask_);
 404   glStencilMaskSeparate(GL_BACK, stencil_back_writemask_);
 405   glStencilOpSeparate(GL_FRONT,
 406                       stencil_front_fail_op_,
 407                       stencil_front_z_fail_op_,
 408                       stencil_front_z_pass_op_);
 409   glStencilOpSeparate(GL_BACK,
 410                       stencil_back_fail_op_,
 411                       stencil_back_z_fail_op_,
 412                       stencil_back_z_pass_op_);
 413
 414   // Do not leak GLError out of chromium.
 415   ClearGLErrors(true, "Chromium GLError");
 416 }
 417
 418 }  // namespace internal
 419
 420 ScopedAppGLStateRestore::ScopedAppGLStateRestore(CallMode mode)
 421     : impl_(new internal::ScopedAppGLStateRestoreImpl(mode)) {
 422 }
 423
 424 ScopedAppGLStateRestore::~ScopedAppGLStateRestore() {}
 425
 426 bool ScopedAppGLStateRestore::stencil_enabled() const {
 427   return impl_->stencil_enabled();
 428 }
 429 int ScopedAppGLStateRestore::framebuffer_binding_ext() const {
 430   return impl_->framebuffer_binding_ext();
 431 }
 432
 433 }  // namespace android_webview