gpu/command_buffer/common/gles2_cmd_utils.cc

   1 // Copyright (c) 2012 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 // This file is here so other GLES2 related files can have a common set of
   6 // includes where appropriate.
   7
   8 #include <sstream>
   9 #include <GLES2/gl2.h>
  10 #include <GLES2/gl2ext.h>
  11 #include <GLES2/gl2extchromium.h>
  12 #include <GLES3/gl3.h>
  13
  14 #include "base/numerics/safe_math.h"
  15 #include "gpu/command_buffer/common/gles2_cmd_format.h"
  16 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
  17
  18 namespace gpu {
  19 namespace gles2 {
  20
  21 namespace gl_error_bit {
  22 enum GLErrorBit {
  23   kNoError = 0,
  24   kInvalidEnum = (1 << 0),
  25   kInvalidValue = (1 << 1),
  26   kInvalidOperation = (1 << 2),
  27   kOutOfMemory = (1 << 3),
  28   kInvalidFrameBufferOperation = (1 << 4),
  29   kContextLost = (1 << 5)
  30 };
  31 }
  32
  33 int GLES2Util::GLGetNumValuesReturned(int id) const {
  34   switch (id) {
  35     // -- glGetBooleanv, glGetFloatv, glGetIntergerv
  36     case GL_ACTIVE_TEXTURE:
  37       return 1;
  38     case GL_ALIASED_LINE_WIDTH_RANGE:
  39       return 2;
  40     case GL_ALIASED_POINT_SIZE_RANGE:
  41       return 2;
  42     case GL_ALPHA_BITS:
  43       return 1;
  44     case GL_ARRAY_BUFFER_BINDING:
  45       return 1;
  46     case GL_BLEND:
  47       return 1;
  48     case GL_BLEND_COLOR:
  49       return 4;
  50     case GL_BLEND_DST_ALPHA:
  51       return 1;
  52     case GL_BLEND_DST_RGB:
  53       return 1;
  54     case GL_BLEND_EQUATION_ALPHA:
  55       return 1;
  56     case GL_BLEND_EQUATION_RGB:
  57       return 1;
  58     case GL_BLEND_SRC_ALPHA:
  59       return 1;
  60     case GL_BLEND_SRC_RGB:
  61       return 1;
  62     case GL_BLUE_BITS:
  63       return 1;
  64     case GL_COLOR_CLEAR_VALUE:
  65       return 4;
  66     case GL_COLOR_WRITEMASK:
  67       return 4;
  68     case GL_COMPRESSED_TEXTURE_FORMATS:
  69       return num_compressed_texture_formats_;
  70     case GL_CULL_FACE:
  71       return 1;
  72     case GL_CULL_FACE_MODE:
  73       return 1;
  74     case GL_CURRENT_PROGRAM:
  75       return 1;
  76     case GL_DEPTH_BITS:
  77       return 1;
  78     case GL_DEPTH_CLEAR_VALUE:
  79       return 1;
  80     case GL_DEPTH_FUNC:
  81       return 1;
  82     case GL_DEPTH_RANGE:
  83       return 2;
  84     case GL_DEPTH_TEST:
  85       return 1;
  86     case GL_DEPTH_WRITEMASK:
  87       return 1;
  88     case GL_DITHER:
  89       return 1;
  90     case GL_ELEMENT_ARRAY_BUFFER_BINDING:
  91       return 1;
  92     case GL_FRAMEBUFFER_BINDING:
  93       return 1;
  94     case GL_FRONT_FACE:
  95       return 1;
  96     case GL_GENERATE_MIPMAP_HINT:
  97       return 1;
  98     case GL_GREEN_BITS:
  99       return 1;
 100     case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
 101       return 1;
 102     case GL_IMPLEMENTATION_COLOR_READ_TYPE:
 103       return 1;
 104     case GL_LINE_WIDTH:
 105       return 1;
 106     case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
 107       return 1;
 108     case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
 109       return 1;
 110     case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
 111       return 1;
 112     case GL_MAX_RENDERBUFFER_SIZE:
 113       return 1;
 114     case GL_MAX_TEXTURE_IMAGE_UNITS:
 115       return 1;
 116     case GL_MAX_TEXTURE_SIZE:
 117       return 1;
 118     case GL_MAX_VARYING_VECTORS:
 119       return 1;
 120     case GL_MAX_VERTEX_ATTRIBS:
 121       return 1;
 122     case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
 123       return 1;
 124     case GL_MAX_VERTEX_UNIFORM_VECTORS:
 125       return 1;
 126     case GL_MAX_VIEWPORT_DIMS:
 127       return 2;
 128     case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
 129       return 1;
 130     case GL_NUM_SHADER_BINARY_FORMATS:
 131       return 1;
 132     case GL_PACK_ALIGNMENT:
 133       return 1;
 134     case GL_PACK_REVERSE_ROW_ORDER_ANGLE:
 135       return 1;
 136     case GL_POLYGON_OFFSET_FACTOR:
 137       return 1;
 138     case GL_POLYGON_OFFSET_FILL:
 139       return 1;
 140     case GL_POLYGON_OFFSET_UNITS:
 141       return 1;
 142     case GL_RED_BITS:
 143       return 1;
 144     case GL_RENDERBUFFER_BINDING:
 145       return 1;
 146     case GL_SAMPLE_BUFFERS:
 147       return 1;
 148     case GL_SAMPLE_COVERAGE_INVERT:
 149       return 1;
 150     case GL_SAMPLE_COVERAGE_VALUE:
 151       return 1;
 152     case GL_SAMPLES:
 153       return 1;
 154     case GL_SCISSOR_BOX:
 155       return 4;
 156     case GL_SCISSOR_TEST:
 157       return 1;
 158     case GL_SHADER_BINARY_FORMATS:
 159       return num_shader_binary_formats_;
 160     case GL_SHADER_COMPILER:
 161       return 1;
 162     case GL_STENCIL_BACK_FAIL:
 163       return 1;
 164     case GL_STENCIL_BACK_FUNC:
 165       return 1;
 166     case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
 167       return 1;
 168     case GL_STENCIL_BACK_PASS_DEPTH_PASS:
 169       return 1;
 170     case GL_STENCIL_BACK_REF:
 171       return 1;
 172     case GL_STENCIL_BACK_VALUE_MASK:
 173       return 1;
 174     case GL_STENCIL_BACK_WRITEMASK:
 175       return 1;
 176     case GL_STENCIL_BITS:
 177       return 1;
 178     case GL_STENCIL_CLEAR_VALUE:
 179       return 1;
 180     case GL_STENCIL_FAIL:
 181       return 1;
 182     case GL_STENCIL_FUNC:
 183       return 1;
 184     case GL_STENCIL_PASS_DEPTH_FAIL:
 185       return 1;
 186     case GL_STENCIL_PASS_DEPTH_PASS:
 187       return 1;
 188     case GL_STENCIL_REF:
 189       return 1;
 190     case GL_STENCIL_TEST:
 191       return 1;
 192     case GL_STENCIL_VALUE_MASK:
 193       return 1;
 194     case GL_STENCIL_WRITEMASK:
 195       return 1;
 196     case GL_SUBPIXEL_BITS:
 197       return 1;
 198     case GL_TEXTURE_BINDING_2D:
 199       return 1;
 200     case GL_TEXTURE_BINDING_CUBE_MAP:
 201       return 1;
 202     case GL_TEXTURE_BINDING_EXTERNAL_OES:
 203       return 1;
 204     case GL_TEXTURE_BINDING_RECTANGLE_ARB:
 205       return 1;
 206     case GL_UNPACK_ALIGNMENT:
 207       return 1;
 208     case GL_VIEWPORT:
 209       return 4;
 210
 211     // ES3
 212     case GL_COPY_READ_BUFFER_BINDING:
 213       return 1;
 214     case GL_COPY_WRITE_BUFFER_BINDING:
 215       return 1;
 216     case GL_PIXEL_PACK_BUFFER_BINDING:
 217       return 1;
 218     case GL_PIXEL_UNPACK_BUFFER_BINDING:
 219       return 1;
 220     case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
 221       return 1;
 222     case GL_UNIFORM_BUFFER_BINDING:
 223       return 1;
 224
 225     // -- glGetBooleanv, glGetFloatv, glGetIntergerv with
 226     //    GL_CHROMIUM_framebuffer_multisample
 227     case GL_MAX_SAMPLES_EXT:
 228       return 1;
 229     case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
 230       return 1;
 231
 232     // -- glGetBufferParameteriv
 233     case GL_BUFFER_SIZE:
 234       return 1;
 235     case GL_BUFFER_USAGE:
 236       return 1;
 237
 238     // ES3
 239     case GL_BUFFER_MAPPED:
 240       return 1;
 241     case GL_BUFFER_ACCESS_FLAGS:
 242       return 1;
 243     case GL_BUFFER_MAP_LENGTH:
 244       return 1;
 245     case GL_BUFFER_MAP_OFFSET:
 246       return 1;
 247
 248     // -- glGetFramebufferAttachmentParameteriv
 249     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
 250       return 1;
 251     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
 252       return 1;
 253     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
 254       return 1;
 255     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
 256       return 1;
 257     // -- glGetFramebufferAttachmentParameteriv with
 258     //    GL_EXT_multisampled_render_to_texture
 259     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
 260       return 1;
 261     // -- glGetFramebufferAttachmentParameteriv with
 262     //    GL_EXT_sRGB
 263     case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT:
 264       return 1;
 265
 266     // -- glGetProgramiv
 267     case GL_DELETE_STATUS:
 268       return 1;
 269     case GL_LINK_STATUS:
 270       return 1;
 271     case GL_VALIDATE_STATUS:
 272       return 1;
 273     case GL_INFO_LOG_LENGTH:
 274       return 1;
 275     case GL_ATTACHED_SHADERS:
 276       return 1;
 277     case GL_ACTIVE_ATTRIBUTES:
 278       return 1;
 279     case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 280       return 1;
 281     case GL_ACTIVE_UNIFORMS:
 282       return 1;
 283     case GL_ACTIVE_UNIFORM_MAX_LENGTH:
 284       return 1;
 285
 286     // -- glGetRenderbufferAttachmentParameteriv
 287     case GL_RENDERBUFFER_WIDTH:
 288       return 1;
 289     case GL_RENDERBUFFER_HEIGHT:
 290       return 1;
 291     case GL_RENDERBUFFER_INTERNAL_FORMAT:
 292       return 1;
 293     case GL_RENDERBUFFER_RED_SIZE:
 294       return 1;
 295     case GL_RENDERBUFFER_GREEN_SIZE:
 296       return 1;
 297     case GL_RENDERBUFFER_BLUE_SIZE:
 298       return 1;
 299     case GL_RENDERBUFFER_ALPHA_SIZE:
 300       return 1;
 301     case GL_RENDERBUFFER_DEPTH_SIZE:
 302       return 1;
 303     case GL_RENDERBUFFER_STENCIL_SIZE:
 304       return 1;
 305     // -- glGetRenderbufferAttachmentParameteriv with
 306     //    GL_EXT_multisampled_render_to_texture
 307     case GL_RENDERBUFFER_SAMPLES_EXT:
 308       return 1;
 309
 310     // -- glGetShaderiv
 311     case GL_SHADER_TYPE:
 312       return 1;
 313     // Already defined under glGetFramebufferAttachemntParameteriv.
 314     // case GL_DELETE_STATUS:
 315     //   return 1;
 316     case GL_COMPILE_STATUS:
 317       return 1;
 318     // Already defined under glGetFramebufferAttachemntParameteriv.
 319     // case GL_INFO_LOG_LENGTH:
 320     //   return 1;
 321     case GL_SHADER_SOURCE_LENGTH:
 322       return 1;
 323     case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
 324       return 1;
 325
 326     // -- glGetTexParameterfv, glGetTexParameteriv
 327     case GL_TEXTURE_MAG_FILTER:
 328       return 1;
 329     case GL_TEXTURE_MIN_FILTER:
 330       return 1;
 331     case GL_TEXTURE_WRAP_R:
 332       return 1;
 333     case GL_TEXTURE_WRAP_S:
 334       return 1;
 335     case GL_TEXTURE_WRAP_T:
 336       return 1;
 337     case GL_TEXTURE_COMPARE_FUNC:
 338       return 1;
 339     case GL_TEXTURE_COMPARE_MODE:
 340       return 1;
 341     case GL_TEXTURE_MAX_LOD:
 342       return 1;
 343     case GL_TEXTURE_MIN_LOD:
 344       return 1;
 345     case GL_TEXTURE_BASE_LEVEL:
 346       return 1;
 347     case GL_TEXTURE_MAX_LEVEL:
 348       return 1;
 349     case GL_TEXTURE_IMMUTABLE_FORMAT:
 350       return 1;
 351     case GL_TEXTURE_IMMUTABLE_LEVELS:
 352       return 1;
 353     case GL_TEXTURE_MAX_ANISOTROPY_EXT:
 354       return 1;
 355
 356     // -- glGetVertexAttrib
 357     case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
 358       return 1;
 359     case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
 360       return 1;
 361     case GL_VERTEX_ATTRIB_ARRAY_SIZE:
 362       return 1;
 363     case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
 364       return 1;
 365     case GL_VERTEX_ATTRIB_ARRAY_TYPE:
 366       return 1;
 367     case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
 368       return 1;
 369     case GL_CURRENT_VERTEX_ATTRIB:
 370       return 4;
 371     case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
 372       return 1;
 373     case GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
 374       return 1;
 375
 376     // -- glGetSynciv
 377     case GL_OBJECT_TYPE:
 378       return 1;
 379     case GL_SYNC_STATUS:
 380       return 1;
 381     case GL_SYNC_CONDITION:
 382       return 1;
 383     case GL_SYNC_FLAGS:
 384       return 1;
 385
 386     // -- glHint with GL_OES_standard_derivatives
 387     case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
 388       return 1;
 389
 390     // Chromium internal bind_generates_resource query
 391     case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
 392       return 1;
 393
 394     // bad enum
 395     default:
 396       return 0;
 397   }
 398 }
 399
 400 namespace {
 401
 402 // Return the number of elements per group of a specified format.
 403 int ElementsPerGroup(int format, int type) {
 404   switch (type) {
 405     case GL_UNSIGNED_SHORT_5_6_5:
 406     case GL_UNSIGNED_SHORT_4_4_4_4:
 407     case GL_UNSIGNED_SHORT_5_5_5_1:
 408     case GL_UNSIGNED_INT_24_8_OES:
 409     case GL_UNSIGNED_INT_2_10_10_10_REV:
 410     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 411     case GL_UNSIGNED_INT_5_9_9_9_REV:
 412     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 413        return 1;
 414     default:
 415        break;
 416     }
 417
 418     switch (format) {
 419     case GL_RGB:
 420     case GL_RGB_INTEGER:
 421     case GL_SRGB_EXT:
 422        return 3;
 423     case GL_LUMINANCE_ALPHA:
 424     case GL_RG_EXT:
 425     case GL_RG_INTEGER:
 426        return 2;
 427     case GL_RGBA:
 428     case GL_RGBA_INTEGER:
 429     case GL_BGRA_EXT:
 430     case GL_SRGB_ALPHA_EXT:
 431        return 4;
 432     case GL_ALPHA:
 433     case GL_LUMINANCE:
 434     case GL_DEPTH_COMPONENT:
 435     case GL_DEPTH_COMPONENT24_OES:
 436     case GL_DEPTH_COMPONENT32_OES:
 437     case GL_DEPTH_COMPONENT16:
 438     case GL_DEPTH24_STENCIL8_OES:
 439     case GL_DEPTH_STENCIL_OES:
 440     case GL_RED_EXT:
 441     case GL_RED_INTEGER:
 442        return 1;
 443     default:
 444        return 0;
 445   }
 446 }
 447
 448 // Return the number of bytes per element, based on the element type.
 449 int BytesPerElement(int type) {
 450   switch (type) {
 451     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 452       return 8;
 453     case GL_FLOAT:
 454     case GL_UNSIGNED_INT_24_8_OES:
 455     case GL_UNSIGNED_INT:
 456     case GL_INT:
 457     case GL_UNSIGNED_INT_2_10_10_10_REV:
 458     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 459     case GL_UNSIGNED_INT_5_9_9_9_REV:
 460       return 4;
 461     case GL_HALF_FLOAT:
 462     case GL_HALF_FLOAT_OES:
 463     case GL_UNSIGNED_SHORT:
 464     case GL_SHORT:
 465     case GL_UNSIGNED_SHORT_5_6_5:
 466     case GL_UNSIGNED_SHORT_4_4_4_4:
 467     case GL_UNSIGNED_SHORT_5_5_5_1:
 468        return 2;
 469     case GL_UNSIGNED_BYTE:
 470     case GL_BYTE:
 471        return 1;
 472     default:
 473        return 0;
 474   }
 475 }
 476
 477 }  // anonymous namespace
 478
 479 uint32 GLES2Util::ComputeImageGroupSize(int format, int type) {
 480   int bytes_per_element = BytesPerElement(type);
 481   DCHECK_GE(8, bytes_per_element);
 482   int elements_per_group = ElementsPerGroup(format, type);
 483   DCHECK_GE(4, elements_per_group);
 484   return  bytes_per_element * elements_per_group;
 485 }
 486
 487 bool GLES2Util::ComputeImagePaddedRowSize(
 488         int width, int format, int type, int unpack_alignment,
 489         uint32* padded_row_size) {
 490   DCHECK(unpack_alignment == 1 || unpack_alignment == 2 ||
 491          unpack_alignment == 4 || unpack_alignment == 8);
 492   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 493   uint32 unpadded_row_size;
 494   if (!SafeMultiplyUint32(width, bytes_per_group, &unpadded_row_size)) {
 495     return false;
 496   }
 497   uint32 temp;
 498   if (!SafeAddUint32(unpadded_row_size, unpack_alignment - 1, &temp)) {
 499       return false;
 500   }
 501   *padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 502   return true;
 503 }
 504
 505 // Returns the amount of data glTexImage*D or glTexSubImage*D will access.
 506 bool GLES2Util::ComputeImageDataSizes(
 507     int width, int height, int depth, int format, int type,
 508     int unpack_alignment, uint32* size, uint32* ret_unpadded_row_size,
 509     uint32* ret_padded_row_size) {
 510   DCHECK(unpack_alignment == 1 || unpack_alignment == 2 ||
 511          unpack_alignment == 4 || unpack_alignment == 8);
 512   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 513   uint32 row_size;
 514   if (!SafeMultiplyUint32(width, bytes_per_group, &row_size)) {
 515     return false;
 516   }
 517   uint32 num_of_rows;
 518   if (!SafeMultiplyUint32(height, depth, &num_of_rows)) {
 519     return false;
 520   }
 521   if (num_of_rows > 1) {
 522     uint32 temp;
 523     if (!SafeAddUint32(row_size, unpack_alignment - 1, &temp)) {
 524       return false;
 525     }
 526     uint32 padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 527     uint32 size_of_all_but_last_row;
 528     if (!SafeMultiplyUint32((num_of_rows - 1), padded_row_size,
 529                             &size_of_all_but_last_row)) {
 530       return false;
 531     }
 532     if (!SafeAddUint32(size_of_all_but_last_row, row_size, size)) {
 533       return false;
 534     }
 535     if (ret_padded_row_size) {
 536       *ret_padded_row_size = padded_row_size;
 537     }
 538   } else {
 539     *size = row_size;
 540     if (ret_padded_row_size) {
 541       *ret_padded_row_size = row_size;
 542     }
 543   }
 544   if (ret_unpadded_row_size) {
 545     *ret_unpadded_row_size = row_size;
 546   }
 547
 548   return true;
 549 }
 550
 551 size_t GLES2Util::RenderbufferBytesPerPixel(int format) {
 552   switch (format) {
 553     case GL_STENCIL_INDEX8:
 554       return 1;
 555     case GL_RGBA4:
 556     case GL_RGB565:
 557     case GL_RGB5_A1:
 558     case GL_DEPTH_COMPONENT16:
 559       return 2;
 560     case GL_RGB:
 561     case GL_RGBA:
 562     case GL_DEPTH24_STENCIL8_OES:
 563     case GL_RGB8_OES:
 564     case GL_RGBA8_OES:
 565     case GL_DEPTH_COMPONENT24_OES:
 566       return 4;
 567     default:
 568       return 0;
 569   }
 570 }
 571
 572 uint32 GLES2Util::GetElementSizeForUniformType(int type) {
 573   switch (type) {
 574     case GL_FLOAT:
 575     case GL_FLOAT_VEC2:
 576     case GL_FLOAT_VEC3:
 577     case GL_FLOAT_VEC4:
 578     case GL_FLOAT_MAT2:
 579     case GL_FLOAT_MAT3:
 580     case GL_FLOAT_MAT4:
 581       return sizeof(GLfloat);
 582     case GL_INT:
 583     case GL_INT_VEC2:
 584     case GL_INT_VEC3:
 585     case GL_INT_VEC4:
 586     case GL_BOOL:
 587     case GL_BOOL_VEC2:
 588     case GL_BOOL_VEC3:
 589     case GL_BOOL_VEC4:
 590     case GL_SAMPLER_2D:
 591     case GL_SAMPLER_CUBE:
 592     case GL_SAMPLER_2D_RECT_ARB:  // extension.
 593     case GL_SAMPLER_EXTERNAL_OES:  // extension.
 594       return sizeof(GLint);
 595
 596     // ES3 types.
 597     case GL_UNSIGNED_INT:
 598     case GL_UNSIGNED_INT_VEC2:
 599     case GL_UNSIGNED_INT_VEC3:
 600     case GL_UNSIGNED_INT_VEC4:
 601       return sizeof(GLuint);
 602     case GL_SAMPLER_3D:
 603     case GL_SAMPLER_2D_SHADOW:
 604     case GL_SAMPLER_2D_ARRAY:
 605     case GL_SAMPLER_2D_ARRAY_SHADOW:
 606     case GL_SAMPLER_CUBE_SHADOW:
 607     case GL_INT_SAMPLER_2D:
 608     case GL_INT_SAMPLER_3D:
 609     case GL_INT_SAMPLER_CUBE:
 610     case GL_INT_SAMPLER_2D_ARRAY:
 611     case GL_UNSIGNED_INT_SAMPLER_2D:
 612     case GL_UNSIGNED_INT_SAMPLER_3D:
 613     case GL_UNSIGNED_INT_SAMPLER_CUBE:
 614     case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
 615       return sizeof(GLint);
 616     case GL_FLOAT_MAT2x3:
 617     case GL_FLOAT_MAT3x2:
 618     case GL_FLOAT_MAT2x4:
 619     case GL_FLOAT_MAT4x2:
 620     case GL_FLOAT_MAT3x4:
 621     case GL_FLOAT_MAT4x3:
 622       return sizeof(GLfloat);
 623
 624     default:
 625       return 0;
 626   }
 627 }
 628
 629 uint32 GLES2Util::GetElementCountForUniformType(int type) {
 630   switch (type) {
 631     case GL_FLOAT:
 632     case GL_INT:
 633     case GL_BOOL:
 634     case GL_SAMPLER_2D:
 635     case GL_SAMPLER_CUBE:
 636     case GL_SAMPLER_2D_RECT_ARB:  // extension.
 637     case GL_SAMPLER_EXTERNAL_OES:  // extension.
 638       return 1;
 639     case GL_FLOAT_VEC2:
 640     case GL_INT_VEC2:
 641     case GL_BOOL_VEC2:
 642       return 2;
 643     case GL_FLOAT_VEC3:
 644     case GL_INT_VEC3:
 645     case GL_BOOL_VEC3:
 646       return 3;
 647     case GL_FLOAT_VEC4:
 648     case GL_INT_VEC4:
 649     case GL_BOOL_VEC4:
 650     case GL_FLOAT_MAT2:
 651       return 4;
 652     case GL_FLOAT_MAT3:
 653       return 9;
 654     case GL_FLOAT_MAT4:
 655       return 16;
 656
 657     // ES3 types.
 658     case GL_UNSIGNED_INT:
 659     case GL_SAMPLER_3D:
 660     case GL_SAMPLER_2D_SHADOW:
 661     case GL_SAMPLER_2D_ARRAY:
 662     case GL_SAMPLER_2D_ARRAY_SHADOW:
 663     case GL_SAMPLER_CUBE_SHADOW:
 664     case GL_INT_SAMPLER_2D:
 665     case GL_INT_SAMPLER_3D:
 666     case GL_INT_SAMPLER_CUBE:
 667     case GL_INT_SAMPLER_2D_ARRAY:
 668     case GL_UNSIGNED_INT_SAMPLER_2D:
 669     case GL_UNSIGNED_INT_SAMPLER_3D:
 670     case GL_UNSIGNED_INT_SAMPLER_CUBE:
 671     case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
 672       return 1;
 673     case GL_UNSIGNED_INT_VEC2:
 674       return 2;
 675     case GL_UNSIGNED_INT_VEC3:
 676       return 3;
 677     case GL_UNSIGNED_INT_VEC4:
 678       return 4;
 679     case GL_FLOAT_MAT2x3:
 680     case GL_FLOAT_MAT3x2:
 681       return 6;
 682     case GL_FLOAT_MAT2x4:
 683     case GL_FLOAT_MAT4x2:
 684       return 8;
 685     case GL_FLOAT_MAT3x4:
 686     case GL_FLOAT_MAT4x3:
 687       return 12;
 688
 689     default:
 690       return 0;
 691   }
 692 }
 693
 694 size_t GLES2Util::GetGLTypeSizeForTexturesAndBuffers(uint32 type) {
 695   switch (type) {
 696     case GL_BYTE:
 697       return sizeof(GLbyte);  // NOLINT
 698     case GL_UNSIGNED_BYTE:
 699       return sizeof(GLubyte);  // NOLINT
 700     case GL_SHORT:
 701       return sizeof(GLshort);  // NOLINT
 702     case GL_UNSIGNED_SHORT:
 703       return sizeof(GLushort);  // NOLINT
 704     case GL_INT:
 705       return sizeof(GLint);  // NOLINT
 706     case GL_UNSIGNED_INT:
 707       return sizeof(GLuint);  // NOLINT
 708     case GL_FLOAT:
 709       return sizeof(GLfloat);  // NOLINT
 710     case GL_FIXED:
 711       return sizeof(GLfixed);  // NOLINT
 712     default:
 713       return 0;
 714   }
 715 }
 716
 717 size_t GLES2Util::GetGLTypeSizeForPathCoordType(uint32 type) {
 718   switch (type) {
 719     case GL_BYTE:
 720       return sizeof(GLbyte);  // NOLINT
 721     case GL_UNSIGNED_BYTE:
 722       return sizeof(GLubyte);  // NOLINT
 723     case GL_SHORT:
 724       return sizeof(GLshort);  // NOLINT
 725     case GL_UNSIGNED_SHORT:
 726       return sizeof(GLushort);  // NOLINT
 727     case GL_FLOAT:
 728       return sizeof(GLfloat);  // NOLINT
 729     default:
 730       return 0;
 731   }
 732 }
 733
 734 uint32 GLES2Util::GLErrorToErrorBit(uint32 error) {
 735   switch (error) {
 736     case GL_INVALID_ENUM:
 737       return gl_error_bit::kInvalidEnum;
 738     case GL_INVALID_VALUE:
 739       return gl_error_bit::kInvalidValue;
 740     case GL_INVALID_OPERATION:
 741       return gl_error_bit::kInvalidOperation;
 742     case GL_OUT_OF_MEMORY:
 743       return gl_error_bit::kOutOfMemory;
 744     case GL_INVALID_FRAMEBUFFER_OPERATION:
 745       return gl_error_bit::kInvalidFrameBufferOperation;
 746     case GL_CONTEXT_LOST_KHR:
 747       return gl_error_bit::kContextLost;
 748     default:
 749       NOTREACHED();
 750       return gl_error_bit::kNoError;
 751   }
 752 }
 753
 754 uint32 GLES2Util::GLErrorBitToGLError(uint32 error_bit) {
 755   switch (error_bit) {
 756     case gl_error_bit::kInvalidEnum:
 757       return GL_INVALID_ENUM;
 758     case gl_error_bit::kInvalidValue:
 759       return GL_INVALID_VALUE;
 760     case gl_error_bit::kInvalidOperation:
 761       return GL_INVALID_OPERATION;
 762     case gl_error_bit::kOutOfMemory:
 763       return GL_OUT_OF_MEMORY;
 764     case gl_error_bit::kInvalidFrameBufferOperation:
 765       return GL_INVALID_FRAMEBUFFER_OPERATION;
 766     case gl_error_bit::kContextLost:
 767       return GL_CONTEXT_LOST_KHR;
 768     default:
 769       NOTREACHED();
 770       return GL_NO_ERROR;
 771   }
 772 }
 773
 774 uint32 GLES2Util::IndexToGLFaceTarget(int index) {
 775   static uint32 faces[] = {
 776     GL_TEXTURE_CUBE_MAP_POSITIVE_X,
 777     GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 778     GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 779     GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 780     GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 781     GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 782   };
 783   return faces[index];
 784 }
 785
 786 size_t GLES2Util::GLTargetToFaceIndex(uint32 target) {
 787   switch (target) {
 788     case GL_TEXTURE_2D:
 789     case GL_TEXTURE_EXTERNAL_OES:
 790     case GL_TEXTURE_RECTANGLE_ARB:
 791     case GL_TEXTURE_3D:
 792     case GL_TEXTURE_2D_ARRAY:
 793       return 0;
 794     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 795       return 0;
 796     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 797       return 1;
 798     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 799       return 2;
 800     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 801       return 3;
 802     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 803       return 4;
 804     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 805       return 5;
 806     default:
 807       NOTREACHED();
 808       return 0;
 809   }
 810 }
 811
 812 uint32 GLES2Util::GetGLReadPixelsImplementationFormat(
 813     uint32 internal_format) {
 814   switch (internal_format) {
 815     case GL_R8:
 816     case GL_R16F:
 817     case GL_R32F:
 818       return GL_RED;
 819     case GL_R8UI:
 820     case GL_R8I:
 821     case GL_R16UI:
 822     case GL_R16I:
 823     case GL_R32UI:
 824     case GL_R32I:
 825       return GL_RED_INTEGER;
 826     case GL_RG8:
 827     case GL_RG16F:
 828     case GL_RG32F:
 829       return GL_RG;
 830     case GL_RG8UI:
 831     case GL_RG8I:
 832     case GL_RG16UI:
 833     case GL_RG16I:
 834     case GL_RG32UI:
 835     case GL_RG32I:
 836       return GL_RG_INTEGER;
 837     case GL_RGB:
 838     case GL_RGB8:
 839     case GL_RGB565:
 840     case GL_R11F_G11F_B10F:
 841     case GL_RGB16F:
 842     case GL_RGB32F:
 843       return GL_RGB;
 844     case GL_RGBA8UI:
 845     case GL_RGBA8I:
 846     case GL_RGB10_A2UI:
 847     case GL_RGBA16UI:
 848     case GL_RGBA16I:
 849     case GL_RGBA32UI:
 850     case GL_RGBA32I:
 851       return GL_RGBA_INTEGER;
 852     default:
 853       return GL_RGBA;
 854   }
 855 }
 856
 857 uint32 GLES2Util::GetGLReadPixelsImplementationType(
 858     uint32 internal_format, uint32 texture_type) {
 859   switch (internal_format) {
 860     case GL_R16UI:
 861     case GL_RG16UI:
 862     case GL_RGBA16UI:
 863     case GL_RGB10_A2:
 864     case GL_RGB10_A2UI:
 865       return GL_UNSIGNED_SHORT;
 866     case GL_R32UI:
 867     case GL_RG32UI:
 868     case GL_RGBA32UI:
 869       return GL_UNSIGNED_INT;
 870     case GL_R8I:
 871     case GL_RG8I:
 872     case GL_RGBA8I:
 873       return GL_BYTE;
 874     case GL_R16I:
 875     case GL_RG16I:
 876     case GL_RGBA16I:
 877       return GL_SHORT;
 878     case GL_R32I:
 879     case GL_RG32I:
 880     case GL_RGBA32I:
 881       return GL_INT;
 882     case GL_R32F:
 883     case GL_RG32F:
 884     case GL_RGB32F:
 885     case GL_RGBA32F:
 886       return GL_FLOAT;
 887     case GL_R16F:
 888     case GL_RG16F:
 889     case GL_R11F_G11F_B10F:
 890     case GL_RGB16F:
 891     case GL_RGBA16F:
 892       // TODO(zmo): Consider return GL_UNSIGNED_INT_10F_11F_11F_REV and
 893       // GL_HALF_FLOAT.
 894       return GL_FLOAT;
 895     case GL_RGBA:
 896     case GL_RGB:
 897       // Unsized internal format, check the type
 898       switch (texture_type) {
 899         case GL_FLOAT:
 900         case GL_HALF_FLOAT_OES:
 901           return GL_FLOAT;
 902         // TODO(zmo): Consider return GL_UNSIGNED_SHORT_5_6_5,
 903         // GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_5_5_5_1, and
 904         // GL_UNSIGNED_INT_2_10_10_10_REV.
 905         default:
 906           return GL_UNSIGNED_BYTE;
 907       }
 908     default:
 909       return GL_UNSIGNED_BYTE;
 910   }
 911 }
 912
 913 uint32 GLES2Util::GetChannelsForFormat(int format) {
 914   switch (format) {
 915     case GL_ALPHA:
 916     case GL_ALPHA16F_EXT:
 917     case GL_ALPHA32F_EXT:
 918       return kAlpha;
 919     case GL_LUMINANCE:
 920       return kRGB;
 921     case GL_LUMINANCE_ALPHA:
 922       return kRGBA;
 923     case GL_RGB:
 924     case GL_RGB8_OES:
 925     case GL_RGB565:
 926     case GL_RGB16F_EXT:
 927     case GL_RGB32F_EXT:
 928     case GL_SRGB_EXT:
 929     case GL_SRGB8:
 930     case GL_RGB8_SNORM:
 931     case GL_R11F_G11F_B10F:
 932     case GL_RGB9_E5:
 933     case GL_RGB8UI:
 934     case GL_RGB8I:
 935     case GL_RGB16UI:
 936     case GL_RGB16I:
 937     case GL_RGB32UI:
 938     case GL_RGB32I:
 939       return kRGB;
 940     case GL_BGRA_EXT:
 941     case GL_BGRA8_EXT:
 942     case GL_RGBA16F_EXT:
 943     case GL_RGBA32F_EXT:
 944     case GL_RGBA:
 945     case GL_RGBA8_OES:
 946     case GL_RGBA4:
 947     case GL_RGB5_A1:
 948     case GL_SRGB_ALPHA_EXT:
 949     case GL_SRGB8_ALPHA8_EXT:
 950     case GL_RGBA8_SNORM:
 951     case GL_RGB10_A2:
 952     case GL_RGBA8UI:
 953     case GL_RGBA8I:
 954     case GL_RGB10_A2UI:
 955     case GL_RGBA16UI:
 956     case GL_RGBA16I:
 957     case GL_RGBA32UI:
 958     case GL_RGBA32I:
 959       return kRGBA;
 960     case GL_DEPTH_COMPONENT32_OES:
 961     case GL_DEPTH_COMPONENT24_OES:
 962     case GL_DEPTH_COMPONENT16:
 963     case GL_DEPTH_COMPONENT:
 964     case GL_DEPTH_COMPONENT32F:
 965       return kDepth;
 966     case GL_STENCIL_INDEX8:
 967       return kStencil;
 968     case GL_DEPTH_STENCIL_OES:
 969     case GL_DEPTH24_STENCIL8_OES:
 970     case GL_DEPTH32F_STENCIL8:
 971       return kDepth | kStencil;
 972     case GL_RED_EXT:
 973     case GL_R8:
 974     case GL_R8_SNORM:
 975     case GL_R16F:
 976     case GL_R32F:
 977     case GL_R8UI:
 978     case GL_R8I:
 979     case GL_R16UI:
 980     case GL_R16I:
 981     case GL_R32UI:
 982     case GL_R32I:
 983       return kRed;
 984     case GL_RG_EXT:
 985     case GL_RG8:
 986     case GL_RG8_SNORM:
 987     case GL_RG16F:
 988     case GL_RG32F:
 989     case GL_RG8UI:
 990     case GL_RG8I:
 991     case GL_RG16UI:
 992     case GL_RG16I:
 993     case GL_RG32UI:
 994     case GL_RG32I:
 995       return kRed | kGreen;
 996     default:
 997       return 0x0000;
 998   }
 999 }
1000
1001 uint32 GLES2Util::GetChannelsNeededForAttachmentType(
1002     int type, uint32 max_color_attachments) {
1003   switch (type) {
1004     case GL_DEPTH_ATTACHMENT:
1005       return kDepth;
1006     case GL_STENCIL_ATTACHMENT:
1007       return kStencil;
1008     default:
1009       if (type >= GL_COLOR_ATTACHMENT0 &&
1010           type < static_cast<int>(
1011               GL_COLOR_ATTACHMENT0 + max_color_attachments)) {
1012         return kRGBA;
1013       }
1014       return 0x0000;
1015   }
1016 }
1017
1018 std::string GLES2Util::GetStringEnum(uint32 value) {
1019   const EnumToString* entry = enum_to_string_table_;
1020   const EnumToString* end = entry + enum_to_string_table_len_;
1021   for (;entry < end; ++entry) {
1022     if (value == entry->value) {
1023       return entry->name;
1024     }
1025   }
1026   std::stringstream ss;
1027   ss.fill('0');
1028   ss.width(value < 0x10000 ? 4 : 8);
1029   ss << std::hex << value;
1030   return "0x" + ss.str();
1031 }
1032
1033 std::string GLES2Util::GetStringError(uint32 value) {
1034   static EnumToString string_table[] = {
1035     { GL_NONE, "GL_NONE" },
1036   };
1037   return GLES2Util::GetQualifiedEnumString(
1038       string_table, arraysize(string_table), value);
1039 }
1040
1041 std::string GLES2Util::GetStringBool(uint32 value) {
1042   return value ? "GL_TRUE" : "GL_FALSE";
1043 }
1044
1045 std::string GLES2Util::GetQualifiedEnumString(
1046     const EnumToString* table, size_t count, uint32 value) {
1047   for (const EnumToString* end = table + count; table < end; ++table) {
1048     if (table->value == value) {
1049       return table->name;
1050     }
1051   }
1052   return GetStringEnum(value);
1053 }
1054
1055 bool GLES2Util::ParseUniformName(
1056     const std::string& name,
1057     size_t* array_pos,
1058     int* element_index,
1059     bool* getting_array) {
1060   if (name.empty())
1061     return false;
1062   bool getting_array_location = false;
1063   size_t open_pos = std::string::npos;
1064   base::CheckedNumeric<int> index = 0;
1065   if (name[name.size() - 1] == ']') {
1066     if (name.size() < 3) {
1067       return false;
1068     }
1069     open_pos = name.find_last_of('[');
1070     if (open_pos == std::string::npos ||
1071         open_pos >= name.size() - 2) {
1072       return false;
1073     }
1074     size_t last = name.size() - 1;
1075     for (size_t pos = open_pos + 1; pos < last; ++pos) {
1076       int8 digit = name[pos] - '0';
1077       if (digit < 0 || digit > 9) {
1078         return false;
1079       }
1080       index = index * 10 + digit;
1081     }
1082     if (!index.IsValid()) {
1083       return false;
1084     }
1085     getting_array_location = true;
1086   }
1087   *getting_array = getting_array_location;
1088   *element_index = index.ValueOrDie();
1089   *array_pos = open_pos;
1090   return true;
1091 }
1092
1093 size_t GLES2Util::CalcClearBufferivDataCount(int buffer) {
1094   switch (buffer) {
1095     case GL_COLOR:
1096       return 4;
1097     case GL_STENCIL:
1098       return 1;
1099     default:
1100       return 0;
1101   }
1102 }
1103
1104 size_t GLES2Util::CalcClearBufferfvDataCount(int buffer) {
1105   switch (buffer) {
1106     case GL_COLOR:
1107       return 4;
1108     case GL_DEPTH:
1109       return 1;
1110     default:
1111       return 0;
1112   }
1113 }
1114
1115 // static
1116 void GLES2Util::MapUint64ToTwoUint32(
1117     uint64_t v64, uint32_t* v32_0, uint32_t* v32_1) {
1118   DCHECK(v32_0 && v32_1);
1119   *v32_0 = static_cast<uint32_t>(v64 & 0xFFFFFFFF);
1120   *v32_1 = static_cast<uint32_t>((v64 & 0xFFFFFFFF00000000) >> 32);
1121 }
1122
1123 // static
1124 uint64_t GLES2Util::MapTwoUint32ToUint64(uint32_t v32_0, uint32_t v32_1) {
1125   uint64_t v64 = v32_1;
1126   return (v64 << 32) | v32_0;
1127 }
1128
1129 // static
1130 uint32_t GLES2Util::MapBufferTargetToBindingEnum(uint32_t target) {
1131   switch (target) {
1132     case GL_ARRAY_BUFFER:
1133       return GL_ARRAY_BUFFER_BINDING;
1134     case GL_COPY_READ_BUFFER:
1135       return GL_COPY_READ_BUFFER_BINDING;
1136     case GL_COPY_WRITE_BUFFER:
1137       return GL_COPY_WRITE_BUFFER_BINDING;
1138     case GL_ELEMENT_ARRAY_BUFFER:
1139       return GL_ELEMENT_ARRAY_BUFFER_BINDING;
1140     case GL_PIXEL_PACK_BUFFER:
1141       return GL_PIXEL_PACK_BUFFER_BINDING;
1142     case GL_PIXEL_UNPACK_BUFFER:
1143       return GL_PIXEL_UNPACK_BUFFER_BINDING;
1144     case GL_TRANSFORM_FEEDBACK_BUFFER:
1145       return GL_TRANSFORM_FEEDBACK_BUFFER_BINDING;
1146     case GL_UNIFORM_BUFFER:
1147       return GL_UNIFORM_BUFFER_BINDING;
1148     default:
1149       return 0;
1150   }
1151 }
1152
1153 // static
1154 bool GLES2Util::IsUnsignedIntegerFormat(uint32_t internal_format) {
1155   switch (internal_format) {
1156     case GL_R8UI:
1157     case GL_R16UI:
1158     case GL_R32UI:
1159     case GL_RG8UI:
1160     case GL_RG16UI:
1161     case GL_RG32UI:
1162     case GL_RGBA8UI:
1163     case GL_RGB10_A2UI:
1164     case GL_RGBA16UI:
1165     case GL_RGBA32UI:
1166       return true;
1167     default:
1168       return false;
1169   }
1170 }
1171
1172 // static
1173 bool GLES2Util::IsSignedIntegerFormat(uint32_t internal_format) {
1174   switch (internal_format) {
1175     case GL_R8I:
1176     case GL_R16I:
1177     case GL_R32I:
1178     case GL_RG8I:
1179     case GL_RG16I:
1180     case GL_RG32I:
1181     case GL_RGBA8I:
1182     case GL_RGBA16I:
1183     case GL_RGBA32I:
1184       return true;
1185     default:
1186       return false;
1187   }
1188 }
1189
1190 // static
1191 bool GLES2Util::IsIntegerFormat(uint32_t internal_format) {
1192   return (IsUnsignedIntegerFormat(internal_format) ||
1193           IsSignedIntegerFormat(internal_format));
1194 }
1195
1196
1197 namespace {
1198
1199 // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in
1200 // the 16-bit range are the same as used by EGL. Those outside the 16-bit range
1201 // are unique to Chromium. Attributes are matched using a closest fit algorithm.
1202
1203 // From <EGL/egl.h>.
1204 const int32 kAlphaSize       = 0x3021;  // EGL_ALPHA_SIZE
1205 const int32 kBlueSize        = 0x3022;  // EGL_BLUE_SIZE
1206 const int32 kGreenSize       = 0x3023;  // EGL_GREEN_SIZE
1207 const int32 kRedSize         = 0x3024;  // EGL_RED_SIZE
1208 const int32 kDepthSize       = 0x3025;  // EGL_DEPTH_SIZE
1209 const int32 kStencilSize     = 0x3026;  // EGL_STENCIL_SIZE
1210 const int32 kSamples         = 0x3031;  // EGL_SAMPLES
1211 const int32 kSampleBuffers   = 0x3032;  // EGL_SAMPLE_BUFFERS
1212 const int32 kNone            = 0x3038;  // EGL_NONE
1213 const int32 kSwapBehavior    = 0x3093;  // EGL_SWAP_BEHAVIOR
1214 const int32 kBufferPreserved = 0x3094;  // EGL_BUFFER_PRESERVED
1215 const int32 kBufferDestroyed = 0x3095;  // EGL_BUFFER_DESTROYED
1216
1217 // Chromium only.
1218 const int32 kBindGeneratesResource = 0x10000;
1219 const int32 kFailIfMajorPerfCaveat = 0x10001;
1220 const int32 kLoseContextWhenOutOfMemory = 0x10002;
1221 const int32 kWebGLVersion = 0x10003;
1222
1223 }  // namespace
1224
1225 ContextCreationAttribHelper::ContextCreationAttribHelper()
1226     : alpha_size(-1),
1227       blue_size(-1),
1228       green_size(-1),
1229       red_size(-1),
1230       depth_size(-1),
1231       stencil_size(-1),
1232       samples(-1),
1233       sample_buffers(-1),
1234       buffer_preserved(true),
1235       bind_generates_resource(true),
1236       fail_if_major_perf_caveat(false),
1237       lose_context_when_out_of_memory(false),
1238       webgl_version(0) {
1239 }
1240
1241 void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) const {
1242   if (alpha_size != -1) {
1243     attribs->push_back(kAlphaSize);
1244     attribs->push_back(alpha_size);
1245   }
1246   if (blue_size != -1) {
1247     attribs->push_back(kBlueSize);
1248     attribs->push_back(blue_size);
1249   }
1250   if (green_size != -1) {
1251     attribs->push_back(kGreenSize);
1252     attribs->push_back(green_size);
1253   }
1254   if (red_size != -1) {
1255     attribs->push_back(kRedSize);
1256     attribs->push_back(red_size);
1257   }
1258   if (depth_size != -1) {
1259     attribs->push_back(kDepthSize);
1260     attribs->push_back(depth_size);
1261   }
1262   if (stencil_size != -1) {
1263     attribs->push_back(kStencilSize);
1264     attribs->push_back(stencil_size);
1265   }
1266   if (samples != -1) {
1267     attribs->push_back(kSamples);
1268     attribs->push_back(samples);
1269   }
1270   if (sample_buffers != -1) {
1271     attribs->push_back(kSampleBuffers);
1272     attribs->push_back(sample_buffers);
1273   }
1274   attribs->push_back(kSwapBehavior);
1275   attribs->push_back(buffer_preserved ? kBufferPreserved : kBufferDestroyed);
1276   attribs->push_back(kBindGeneratesResource);
1277   attribs->push_back(bind_generates_resource ? 1 : 0);
1278   attribs->push_back(kFailIfMajorPerfCaveat);
1279   attribs->push_back(fail_if_major_perf_caveat ? 1 : 0);
1280   attribs->push_back(kLoseContextWhenOutOfMemory);
1281   attribs->push_back(lose_context_when_out_of_memory ? 1 : 0);
1282   attribs->push_back(kWebGLVersion);
1283   attribs->push_back(webgl_version);
1284   attribs->push_back(kNone);
1285 }
1286
1287 bool ContextCreationAttribHelper::Parse(const std::vector<int32>& attribs) {
1288   for (size_t i = 0; i < attribs.size(); i += 2) {
1289     const int32 attrib = attribs[i];
1290     if (i + 1 >= attribs.size()) {
1291       if (attrib == kNone) {
1292         return true;
1293       }
1294
1295       DLOG(ERROR) << "Missing value after context creation attribute: "
1296                   << attrib;
1297       return false;
1298     }
1299
1300     const int32 value = attribs[i+1];
1301     switch (attrib) {
1302       case kAlphaSize:
1303         alpha_size = value;
1304         break;
1305       case kBlueSize:
1306         blue_size = value;
1307         break;
1308       case kGreenSize:
1309         green_size = value;
1310         break;
1311       case kRedSize:
1312         red_size = value;
1313         break;
1314       case kDepthSize:
1315         depth_size = value;
1316         break;
1317       case kStencilSize:
1318         stencil_size = value;
1319         break;
1320       case kSamples:
1321         samples = value;
1322         break;
1323       case kSampleBuffers:
1324         sample_buffers = value;
1325         break;
1326       case kSwapBehavior:
1327         buffer_preserved = value == kBufferPreserved;
1328         break;
1329       case kBindGeneratesResource:
1330         bind_generates_resource = value != 0;
1331         break;
1332       case kFailIfMajorPerfCaveat:
1333         fail_if_major_perf_caveat = value != 0;
1334         break;
1335       case kLoseContextWhenOutOfMemory:
1336         lose_context_when_out_of_memory = value != 0;
1337         break;
1338       case kWebGLVersion:
1339         webgl_version = value;
1340         break;
1341       case kNone:
1342         // Terminate list, even if more attributes.
1343         return true;
1344       default:
1345         DLOG(ERROR) << "Invalid context creation attribute: " << attrib;
1346         return false;
1347     }
1348   }
1349
1350   return true;
1351 }
1352
1353 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
1354
1355 }  // namespace gles2
1356 }  // namespace gpu
1357