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_TEXTURE_IMMUTABLE_FORMAT_EXT:
 207       return 1;
 208     case GL_UNPACK_ALIGNMENT:
 209       return 1;
 210     case GL_VIEWPORT:
 211       return 4;
 212     // -- glGetBooleanv, glGetFloatv, glGetIntergerv with
 213     //    GL_CHROMIUM_framebuffer_multisample
 214     case GL_MAX_SAMPLES_EXT:
 215       return 1;
 216     case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
 217       return 1;
 218
 219     // -- glGetBufferParameteriv
 220     case GL_BUFFER_SIZE:
 221       return 1;
 222     case GL_BUFFER_USAGE:
 223       return 1;
 224
 225     // -- glGetFramebufferAttachmentParameteriv
 226     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
 227       return 1;
 228     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
 229       return 1;
 230     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
 231       return 1;
 232     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
 233       return 1;
 234     // -- glGetFramebufferAttachmentParameteriv with
 235     //    GL_EXT_multisampled_render_to_texture
 236     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
 237       return 1;
 238     // -- glGetFramebufferAttachmentParameteriv with
 239     //    GL_EXT_sRGB
 240     case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT:
 241       return 1;
 242
 243     // -- glGetProgramiv
 244     case GL_DELETE_STATUS:
 245       return 1;
 246     case GL_LINK_STATUS:
 247       return 1;
 248     case GL_VALIDATE_STATUS:
 249       return 1;
 250     case GL_INFO_LOG_LENGTH:
 251       return 1;
 252     case GL_ATTACHED_SHADERS:
 253       return 1;
 254     case GL_ACTIVE_ATTRIBUTES:
 255       return 1;
 256     case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 257       return 1;
 258     case GL_ACTIVE_UNIFORMS:
 259       return 1;
 260     case GL_ACTIVE_UNIFORM_MAX_LENGTH:
 261       return 1;
 262
 263
 264     // -- glGetRenderbufferAttachmentParameteriv
 265     case GL_RENDERBUFFER_WIDTH:
 266       return 1;
 267     case GL_RENDERBUFFER_HEIGHT:
 268       return 1;
 269     case GL_RENDERBUFFER_INTERNAL_FORMAT:
 270       return 1;
 271     case GL_RENDERBUFFER_RED_SIZE:
 272       return 1;
 273     case GL_RENDERBUFFER_GREEN_SIZE:
 274       return 1;
 275     case GL_RENDERBUFFER_BLUE_SIZE:
 276       return 1;
 277     case GL_RENDERBUFFER_ALPHA_SIZE:
 278       return 1;
 279     case GL_RENDERBUFFER_DEPTH_SIZE:
 280       return 1;
 281     case GL_RENDERBUFFER_STENCIL_SIZE:
 282       return 1;
 283     // -- glGetRenderbufferAttachmentParameteriv with
 284     //    GL_EXT_multisampled_render_to_texture
 285     case GL_RENDERBUFFER_SAMPLES_EXT:
 286       return 1;
 287
 288     // -- glGetShaderiv
 289     case GL_SHADER_TYPE:
 290       return 1;
 291     // Already defined under glGetFramebufferAttachemntParameteriv.
 292     // case GL_DELETE_STATUS:
 293     //   return 1;
 294     case GL_COMPILE_STATUS:
 295       return 1;
 296     // Already defined under glGetFramebufferAttachemntParameteriv.
 297     // case GL_INFO_LOG_LENGTH:
 298     //   return 1;
 299     case GL_SHADER_SOURCE_LENGTH:
 300       return 1;
 301     case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
 302       return 1;
 303
 304     // -- glGetTexParameterfv, glGetTexParameteriv
 305     case GL_TEXTURE_MAG_FILTER:
 306       return 1;
 307     case GL_TEXTURE_MIN_FILTER:
 308       return 1;
 309     case GL_TEXTURE_WRAP_S:
 310       return 1;
 311     case GL_TEXTURE_WRAP_T:
 312       return 1;
 313     case GL_TEXTURE_MAX_ANISOTROPY_EXT:
 314       return 1;
 315
 316     // -- glGetVertexAttribfv, glGetVertexAttribiv
 317     case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
 318       return 1;
 319     case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
 320       return 1;
 321     case GL_VERTEX_ATTRIB_ARRAY_SIZE:
 322       return 1;
 323     case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
 324       return 1;
 325     case GL_VERTEX_ATTRIB_ARRAY_TYPE:
 326       return 1;
 327     case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
 328       return 1;
 329     case GL_CURRENT_VERTEX_ATTRIB:
 330       return 4;
 331
 332     // -- glHint with GL_OES_standard_derivatives
 333     case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
 334       return 1;
 335
 336     // Chromium internal bind_generates_resource query
 337     case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
 338       return 1;
 339
 340     // bad enum
 341     default:
 342       return 0;
 343   }
 344 }
 345
 346 namespace {
 347
 348 // Return the number of elements per group of a specified format.
 349 int ElementsPerGroup(int format, int type) {
 350   switch (type) {
 351     case GL_UNSIGNED_SHORT_5_6_5:
 352     case GL_UNSIGNED_SHORT_4_4_4_4:
 353     case GL_UNSIGNED_SHORT_5_5_5_1:
 354     case GL_UNSIGNED_INT_24_8_OES:
 355     case GL_UNSIGNED_INT_2_10_10_10_REV:
 356     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 357     case GL_UNSIGNED_INT_5_9_9_9_REV:
 358     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 359        return 1;
 360     default:
 361        break;
 362     }
 363
 364     switch (format) {
 365     case GL_RGB:
 366     case GL_RGB_INTEGER:
 367     case GL_SRGB_EXT:
 368        return 3;
 369     case GL_LUMINANCE_ALPHA:
 370     case GL_RG_EXT:
 371     case GL_RG_INTEGER:
 372        return 2;
 373     case GL_RGBA:
 374     case GL_RGBA_INTEGER:
 375     case GL_BGRA_EXT:
 376     case GL_SRGB_ALPHA_EXT:
 377        return 4;
 378     case GL_ALPHA:
 379     case GL_LUMINANCE:
 380     case GL_DEPTH_COMPONENT:
 381     case GL_DEPTH_COMPONENT24_OES:
 382     case GL_DEPTH_COMPONENT32_OES:
 383     case GL_DEPTH_COMPONENT16:
 384     case GL_DEPTH24_STENCIL8_OES:
 385     case GL_DEPTH_STENCIL_OES:
 386     case GL_RED_EXT:
 387     case GL_RED_INTEGER:
 388        return 1;
 389     default:
 390        return 0;
 391   }
 392 }
 393
 394 // Return the number of bytes per element, based on the element type.
 395 int BytesPerElement(int type) {
 396   switch (type) {
 397     case GL_FLOAT:
 398     case GL_UNSIGNED_INT_24_8_OES:
 399     case GL_UNSIGNED_INT:
 400     case GL_UNSIGNED_INT_2_10_10_10_REV:
 401     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 402     case GL_UNSIGNED_INT_5_9_9_9_REV:
 403     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 404       return 4;
 405     case GL_HALF_FLOAT_OES:
 406     case GL_UNSIGNED_SHORT:
 407     case GL_SHORT:
 408     case GL_UNSIGNED_SHORT_5_6_5:
 409     case GL_UNSIGNED_SHORT_4_4_4_4:
 410     case GL_UNSIGNED_SHORT_5_5_5_1:
 411        return 2;
 412     case GL_UNSIGNED_BYTE:
 413     case GL_BYTE:
 414        return 1;
 415     default:
 416        return 0;
 417   }
 418 }
 419
 420 }  // anonymous namespace
 421
 422 uint32 GLES2Util::ComputeImageGroupSize(int format, int type) {
 423   return BytesPerElement(type) * ElementsPerGroup(format, type);
 424 }
 425
 426 bool GLES2Util::ComputeImagePaddedRowSize(
 427         int width, int format, int type, int unpack_alignment,
 428         uint32* padded_row_size) {
 429   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 430   uint32 unpadded_row_size;
 431   if (!SafeMultiplyUint32(width, bytes_per_group, &unpadded_row_size)) {
 432     return false;
 433   }
 434   uint32 temp;
 435   if (!SafeAddUint32(unpadded_row_size, unpack_alignment - 1, &temp)) {
 436       return false;
 437   }
 438   *padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 439   return true;
 440 }
 441
 442 // Returns the amount of data glTexImage*D or glTexSubImage*D will access.
 443 bool GLES2Util::ComputeImageDataSizes(
 444     int width, int height, int depth, int format, int type,
 445     int unpack_alignment, uint32* size, uint32* ret_unpadded_row_size,
 446     uint32* ret_padded_row_size) {
 447   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 448   uint32 row_size;
 449   if (!SafeMultiplyUint32(width, bytes_per_group, &row_size)) {
 450     return false;
 451   }
 452   uint32 num_of_rows;
 453   if (!SafeMultiplyUint32(height, depth, &num_of_rows)) {
 454     return false;
 455   }
 456   if (num_of_rows > 1) {
 457     uint32 temp;
 458     if (!SafeAddUint32(row_size, unpack_alignment - 1, &temp)) {
 459       return false;
 460     }
 461     uint32 padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 462     uint32 size_of_all_but_last_row;
 463     if (!SafeMultiplyUint32((num_of_rows - 1), padded_row_size,
 464                             &size_of_all_but_last_row)) {
 465       return false;
 466     }
 467     if (!SafeAddUint32(size_of_all_but_last_row, row_size, size)) {
 468       return false;
 469     }
 470     if (ret_padded_row_size) {
 471       *ret_padded_row_size = padded_row_size;
 472     }
 473   } else {
 474     *size = row_size;
 475     if (ret_padded_row_size) {
 476       *ret_padded_row_size = row_size;
 477     }
 478   }
 479   if (ret_unpadded_row_size) {
 480     *ret_unpadded_row_size = row_size;
 481   }
 482
 483   return true;
 484 }
 485
 486 size_t GLES2Util::RenderbufferBytesPerPixel(int format) {
 487   switch (format) {
 488     case GL_STENCIL_INDEX8:
 489       return 1;
 490     case GL_RGBA4:
 491     case GL_RGB565:
 492     case GL_RGB5_A1:
 493     case GL_DEPTH_COMPONENT16:
 494       return 2;
 495     case GL_RGB:
 496     case GL_RGBA:
 497     case GL_DEPTH24_STENCIL8_OES:
 498     case GL_RGB8_OES:
 499     case GL_RGBA8_OES:
 500     case GL_DEPTH_COMPONENT24_OES:
 501       return 4;
 502     default:
 503       return 0;
 504   }
 505 }
 506
 507 uint32 GLES2Util::GetGLDataTypeSizeForUniforms(int type) {
 508   switch (type) {
 509     case GL_FLOAT:
 510       return sizeof(GLfloat);              // NOLINT
 511     case GL_FLOAT_VEC2:
 512       return sizeof(GLfloat) * 2;          // NOLINT
 513     case GL_FLOAT_VEC3:
 514       return sizeof(GLfloat) * 3;          // NOLINT
 515     case GL_FLOAT_VEC4:
 516       return sizeof(GLfloat) * 4;          // NOLINT
 517     case GL_INT:
 518       return sizeof(GLint);                // NOLINT
 519     case GL_INT_VEC2:
 520       return sizeof(GLint) * 2;            // NOLINT
 521     case GL_INT_VEC3:
 522       return sizeof(GLint) * 3;            // NOLINT
 523     case GL_INT_VEC4:
 524       return sizeof(GLint) * 4;            // NOLINT
 525     case GL_BOOL:
 526       return sizeof(GLint);                // NOLINT
 527     case GL_BOOL_VEC2:
 528       return sizeof(GLint) * 2;            // NOLINT
 529     case GL_BOOL_VEC3:
 530       return sizeof(GLint) * 3;            // NOLINT
 531     case GL_BOOL_VEC4:
 532       return sizeof(GLint) * 4;            // NOLINT
 533     case GL_FLOAT_MAT2:
 534       return sizeof(GLfloat) * 2 * 2;      // NOLINT
 535     case GL_FLOAT_MAT3:
 536       return sizeof(GLfloat) * 3 * 3;      // NOLINT
 537     case GL_FLOAT_MAT4:
 538       return sizeof(GLfloat) * 4 * 4;      // NOLINT
 539     case GL_SAMPLER_2D:
 540       return sizeof(GLint);                // NOLINT
 541     case GL_SAMPLER_2D_RECT_ARB:
 542       return sizeof(GLint);                // NOLINT
 543     case GL_SAMPLER_CUBE:
 544       return sizeof(GLint);                // NOLINT
 545     case GL_SAMPLER_EXTERNAL_OES:
 546       return sizeof(GLint);                // NOLINT
 547     default:
 548       return 0;
 549   }
 550 }
 551
 552 size_t GLES2Util::GetGLTypeSizeForTexturesAndBuffers(uint32 type) {
 553   switch (type) {
 554     case GL_BYTE:
 555       return sizeof(GLbyte);  // NOLINT
 556     case GL_UNSIGNED_BYTE:
 557       return sizeof(GLubyte);  // NOLINT
 558     case GL_SHORT:
 559       return sizeof(GLshort);  // NOLINT
 560     case GL_UNSIGNED_SHORT:
 561       return sizeof(GLushort);  // NOLINT
 562     case GL_INT:
 563       return sizeof(GLint);  // NOLINT
 564     case GL_UNSIGNED_INT:
 565       return sizeof(GLuint);  // NOLINT
 566     case GL_FLOAT:
 567       return sizeof(GLfloat);  // NOLINT
 568     case GL_FIXED:
 569       return sizeof(GLfixed);  // NOLINT
 570     default:
 571       return 0;
 572   }
 573 }
 574
 575 uint32 GLES2Util::GLErrorToErrorBit(uint32 error) {
 576   switch (error) {
 577     case GL_INVALID_ENUM:
 578       return gl_error_bit::kInvalidEnum;
 579     case GL_INVALID_VALUE:
 580       return gl_error_bit::kInvalidValue;
 581     case GL_INVALID_OPERATION:
 582       return gl_error_bit::kInvalidOperation;
 583     case GL_OUT_OF_MEMORY:
 584       return gl_error_bit::kOutOfMemory;
 585     case GL_INVALID_FRAMEBUFFER_OPERATION:
 586       return gl_error_bit::kInvalidFrameBufferOperation;
 587     case GL_CONTEXT_LOST_KHR:
 588       return gl_error_bit::kContextLost;
 589     default:
 590       NOTREACHED();
 591       return gl_error_bit::kNoError;
 592   }
 593 }
 594
 595 uint32 GLES2Util::GLErrorBitToGLError(uint32 error_bit) {
 596   switch (error_bit) {
 597     case gl_error_bit::kInvalidEnum:
 598       return GL_INVALID_ENUM;
 599     case gl_error_bit::kInvalidValue:
 600       return GL_INVALID_VALUE;
 601     case gl_error_bit::kInvalidOperation:
 602       return GL_INVALID_OPERATION;
 603     case gl_error_bit::kOutOfMemory:
 604       return GL_OUT_OF_MEMORY;
 605     case gl_error_bit::kInvalidFrameBufferOperation:
 606       return GL_INVALID_FRAMEBUFFER_OPERATION;
 607     case gl_error_bit::kContextLost:
 608       return GL_CONTEXT_LOST_KHR;
 609     default:
 610       NOTREACHED();
 611       return GL_NO_ERROR;
 612   }
 613 }
 614
 615 uint32 GLES2Util::IndexToGLFaceTarget(int index) {
 616   static uint32 faces[] = {
 617     GL_TEXTURE_CUBE_MAP_POSITIVE_X,
 618     GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 619     GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 620     GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 621     GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 622     GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 623   };
 624   return faces[index];
 625 }
 626
 627 size_t GLES2Util::GLTargetToFaceIndex(uint32 target) {
 628   switch (target) {
 629     case GL_TEXTURE_2D:
 630     case GL_TEXTURE_EXTERNAL_OES:
 631     case GL_TEXTURE_RECTANGLE_ARB:
 632       return 0;
 633     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 634       return 0;
 635     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 636       return 1;
 637     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 638       return 2;
 639     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 640       return 3;
 641     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 642       return 4;
 643     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 644       return 5;
 645     default:
 646       NOTREACHED();
 647       return 0;
 648   }
 649 }
 650
 651 uint32 GLES2Util::GetPreferredGLReadPixelsFormat(uint32 internal_format) {
 652   switch (internal_format) {
 653     case GL_RGB16F_EXT:
 654     case GL_RGB32F_EXT:
 655       return GL_RGB;
 656     case GL_RGBA16F_EXT:
 657     case GL_RGBA32F_EXT:
 658       return GL_RGBA;
 659     default:
 660       return GL_RGBA;
 661   }
 662 }
 663
 664 uint32 GLES2Util::GetPreferredGLReadPixelsType(
 665     uint32 internal_format, uint32 texture_type) {
 666   switch (internal_format) {
 667     case GL_RGBA32F_EXT:
 668     case GL_RGB32F_EXT:
 669       return GL_FLOAT;
 670     case GL_RGBA16F_EXT:
 671     case GL_RGB16F_EXT:
 672       return GL_HALF_FLOAT_OES;
 673     case GL_RGBA:
 674     case GL_RGB:
 675       // Unsized internal format, check the type
 676       switch (texture_type) {
 677         case GL_FLOAT:
 678         case GL_HALF_FLOAT_OES:
 679           return GL_FLOAT;
 680         default:
 681           return GL_UNSIGNED_BYTE;
 682       }
 683     default:
 684       return GL_UNSIGNED_BYTE;
 685   }
 686 }
 687
 688 uint32 GLES2Util::GetChannelsForFormat(int format) {
 689   switch (format) {
 690     case GL_ALPHA:
 691     case GL_ALPHA16F_EXT:
 692     case GL_ALPHA32F_EXT:
 693       return kAlpha;
 694     case GL_LUMINANCE:
 695       return kRGB;
 696     case GL_LUMINANCE_ALPHA:
 697       return kRGBA;
 698     case GL_RGB:
 699     case GL_RGB8_OES:
 700     case GL_RGB565:
 701     case GL_RGB16F_EXT:
 702     case GL_RGB32F_EXT:
 703     case GL_SRGB_EXT:
 704       return kRGB;
 705     case GL_BGRA_EXT:
 706     case GL_BGRA8_EXT:
 707     case GL_RGBA16F_EXT:
 708     case GL_RGBA32F_EXT:
 709     case GL_RGBA:
 710     case GL_RGBA8_OES:
 711     case GL_RGBA4:
 712     case GL_RGB5_A1:
 713     case GL_SRGB_ALPHA_EXT:
 714     case GL_SRGB8_ALPHA8_EXT:
 715       return kRGBA;
 716     case GL_DEPTH_COMPONENT32_OES:
 717     case GL_DEPTH_COMPONENT24_OES:
 718     case GL_DEPTH_COMPONENT16:
 719     case GL_DEPTH_COMPONENT:
 720       return kDepth;
 721     case GL_STENCIL_INDEX8:
 722       return kStencil;
 723     case GL_DEPTH_STENCIL_OES:
 724     case GL_DEPTH24_STENCIL8_OES:
 725       return kDepth | kStencil;
 726     case GL_RED_EXT:
 727       return kRed;
 728     case GL_RG_EXT:
 729       return kRed | kGreen;
 730     default:
 731       return 0x0000;
 732   }
 733 }
 734
 735 uint32 GLES2Util::GetChannelsNeededForAttachmentType(
 736     int type, uint32 max_color_attachments) {
 737   switch (type) {
 738     case GL_DEPTH_ATTACHMENT:
 739       return kDepth;
 740     case GL_STENCIL_ATTACHMENT:
 741       return kStencil;
 742     default:
 743       if (type >= GL_COLOR_ATTACHMENT0 &&
 744           type < static_cast<int>(
 745               GL_COLOR_ATTACHMENT0 + max_color_attachments)) {
 746         return kRGBA;
 747       }
 748       return 0x0000;
 749   }
 750 }
 751
 752 std::string GLES2Util::GetStringEnum(uint32 value) {
 753   const EnumToString* entry = enum_to_string_table_;
 754   const EnumToString* end = entry + enum_to_string_table_len_;
 755   for (;entry < end; ++entry) {
 756     if (value == entry->value) {
 757       return entry->name;
 758     }
 759   }
 760   std::stringstream ss;
 761   ss.fill('0');
 762   ss.width(value < 0x10000 ? 4 : 8);
 763   ss << std::hex << value;
 764   return "0x" + ss.str();
 765 }
 766
 767 std::string GLES2Util::GetStringError(uint32 value) {
 768   static EnumToString string_table[] = {
 769     { GL_NONE, "GL_NONE" },
 770   };
 771   return GLES2Util::GetQualifiedEnumString(
 772       string_table, arraysize(string_table), value);
 773 }
 774
 775 std::string GLES2Util::GetStringBool(uint32 value) {
 776   return value ? "GL_TRUE" : "GL_FALSE";
 777 }
 778
 779 std::string GLES2Util::GetQualifiedEnumString(
 780     const EnumToString* table, size_t count, uint32 value) {
 781   for (const EnumToString* end = table + count; table < end; ++table) {
 782     if (table->value == value) {
 783       return table->name;
 784     }
 785   }
 786   return GetStringEnum(value);
 787 }
 788
 789 bool GLES2Util::ParseUniformName(
 790     const std::string& name,
 791     size_t* array_pos,
 792     int* element_index,
 793     bool* getting_array) {
 794   if (name.empty())
 795     return false;
 796   bool getting_array_location = false;
 797   size_t open_pos = std::string::npos;
 798   base::CheckedNumeric<int> index = 0;
 799   if (name[name.size() - 1] == ']') {
 800     if (name.size() < 3) {
 801       return false;
 802     }
 803     open_pos = name.find_last_of('[');
 804     if (open_pos == std::string::npos ||
 805         open_pos >= name.size() - 2) {
 806       return false;
 807     }
 808     size_t last = name.size() - 1;
 809     for (size_t pos = open_pos + 1; pos < last; ++pos) {
 810       int8 digit = name[pos] - '0';
 811       if (digit < 0 || digit > 9) {
 812         return false;
 813       }
 814       index = index * 10 + digit;
 815     }
 816     if (!index.IsValid()) {
 817       return false;
 818     }
 819     getting_array_location = true;
 820   }
 821   *getting_array = getting_array_location;
 822   *element_index = index.ValueOrDie();
 823   *array_pos = open_pos;
 824   return true;
 825 }
 826
 827 size_t GLES2Util::CalcClearBufferivDataCount(int buffer) {
 828   switch (buffer) {
 829     case GL_COLOR:
 830       return 4;
 831     case GL_STENCIL:
 832       return 1;
 833     default:
 834       return 0;
 835   }
 836 }
 837
 838 size_t GLES2Util::CalcClearBufferfvDataCount(int buffer) {
 839   switch (buffer) {
 840     case GL_COLOR:
 841       return 4;
 842     case GL_DEPTH:
 843       return 1;
 844     default:
 845       return 0;
 846   }
 847 }
 848
 849 // static
 850 void GLES2Util::MapUint64ToTwoUint32(
 851     uint64_t v64, uint32_t* v32_0, uint32_t* v32_1) {
 852   DCHECK(v32_0 && v32_1);
 853   *v32_0 = static_cast<uint32_t>(v64 & 0xFFFFFFFF);
 854   *v32_1 = static_cast<uint32_t>((v64 & 0xFFFFFFFF00000000) >> 32);
 855 }
 856
 857 // static
 858 uint64_t GLES2Util::MapTwoUint32ToUint64(uint32_t v32_0, uint32_t v32_1) {
 859   uint64_t v64 = v32_1;
 860   return (v64 << 32) | v32_0;
 861 }
 862
 863 namespace {
 864
 865 // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in
 866 // the 16-bit range are the same as used by EGL. Those outside the 16-bit range
 867 // are unique to Chromium. Attributes are matched using a closest fit algorithm.
 868
 869 // From <EGL/egl.h>.
 870 const int32 kAlphaSize       = 0x3021;  // EGL_ALPHA_SIZE
 871 const int32 kBlueSize        = 0x3022;  // EGL_BLUE_SIZE
 872 const int32 kGreenSize       = 0x3023;  // EGL_GREEN_SIZE
 873 const int32 kRedSize         = 0x3024;  // EGL_RED_SIZE
 874 const int32 kDepthSize       = 0x3025;  // EGL_DEPTH_SIZE
 875 const int32 kStencilSize     = 0x3026;  // EGL_STENCIL_SIZE
 876 const int32 kSamples         = 0x3031;  // EGL_SAMPLES
 877 const int32 kSampleBuffers   = 0x3032;  // EGL_SAMPLE_BUFFERS
 878 const int32 kNone            = 0x3038;  // EGL_NONE
 879 const int32 kSwapBehavior    = 0x3093;  // EGL_SWAP_BEHAVIOR
 880 const int32 kBufferPreserved = 0x3094;  // EGL_BUFFER_PRESERVED
 881 const int32 kBufferDestroyed = 0x3095;  // EGL_BUFFER_DESTROYED
 882
 883 // Chromium only.
 884 const int32 kBindGeneratesResource = 0x10000;
 885 const int32 kFailIfMajorPerfCaveat = 0x10001;
 886 const int32 kLoseContextWhenOutOfMemory = 0x10002;
 887
 888 }  // namespace
 889
 890 ContextCreationAttribHelper::ContextCreationAttribHelper()
 891     : alpha_size(-1),
 892       blue_size(-1),
 893       green_size(-1),
 894       red_size(-1),
 895       depth_size(-1),
 896       stencil_size(-1),
 897       samples(-1),
 898       sample_buffers(-1),
 899       buffer_preserved(true),
 900       bind_generates_resource(true),
 901       fail_if_major_perf_caveat(false),
 902       lose_context_when_out_of_memory(false) {}
 903
 904 void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) const {
 905   if (alpha_size != -1) {
 906     attribs->push_back(kAlphaSize);
 907     attribs->push_back(alpha_size);
 908   }
 909   if (blue_size != -1) {
 910     attribs->push_back(kBlueSize);
 911     attribs->push_back(blue_size);
 912   }
 913   if (green_size != -1) {
 914     attribs->push_back(kGreenSize);
 915     attribs->push_back(green_size);
 916   }
 917   if (red_size != -1) {
 918     attribs->push_back(kRedSize);
 919     attribs->push_back(red_size);
 920   }
 921   if (depth_size != -1) {
 922     attribs->push_back(kDepthSize);
 923     attribs->push_back(depth_size);
 924   }
 925   if (stencil_size != -1) {
 926     attribs->push_back(kStencilSize);
 927     attribs->push_back(stencil_size);
 928   }
 929   if (samples != -1) {
 930     attribs->push_back(kSamples);
 931     attribs->push_back(samples);
 932   }
 933   if (sample_buffers != -1) {
 934     attribs->push_back(kSampleBuffers);
 935     attribs->push_back(sample_buffers);
 936   }
 937   attribs->push_back(kSwapBehavior);
 938   attribs->push_back(buffer_preserved ? kBufferPreserved : kBufferDestroyed);
 939   attribs->push_back(kBindGeneratesResource);
 940   attribs->push_back(bind_generates_resource ? 1 : 0);
 941   attribs->push_back(kFailIfMajorPerfCaveat);
 942   attribs->push_back(fail_if_major_perf_caveat ? 1 : 0);
 943   attribs->push_back(kLoseContextWhenOutOfMemory);
 944   attribs->push_back(lose_context_when_out_of_memory ? 1 : 0);
 945   attribs->push_back(kNone);
 946 }
 947
 948 bool ContextCreationAttribHelper::Parse(const std::vector<int32>& attribs) {
 949   for (size_t i = 0; i < attribs.size(); i += 2) {
 950     const int32 attrib = attribs[i];
 951     if (i + 1 >= attribs.size()) {
 952       if (attrib == kNone) {
 953         return true;
 954       }
 955
 956       DLOG(ERROR) << "Missing value after context creation attribute: "
 957                   << attrib;
 958       return false;
 959     }
 960
 961     const int32 value = attribs[i+1];
 962     switch (attrib) {
 963       case kAlphaSize:
 964         alpha_size = value;
 965         break;
 966       case kBlueSize:
 967         blue_size = value;
 968         break;
 969       case kGreenSize:
 970         green_size = value;
 971         break;
 972       case kRedSize:
 973         red_size = value;
 974         break;
 975       case kDepthSize:
 976         depth_size = value;
 977         break;
 978       case kStencilSize:
 979         stencil_size = value;
 980         break;
 981       case kSamples:
 982         samples = value;
 983         break;
 984       case kSampleBuffers:
 985         sample_buffers = value;
 986         break;
 987       case kSwapBehavior:
 988         buffer_preserved = value == kBufferPreserved;
 989         break;
 990       case kBindGeneratesResource:
 991         bind_generates_resource = value != 0;
 992         break;
 993       case kFailIfMajorPerfCaveat:
 994         fail_if_major_perf_caveat = value != 0;
 995         break;
 996       case kLoseContextWhenOutOfMemory:
 997         lose_context_when_out_of_memory = value != 0;
 998         break;
 999       case kNone:
1000         // Terminate list, even if more attributes.
1001         return true;
1002       default:
1003         DLOG(ERROR) << "Invalid context creation attribute: " << attrib;
1004         return false;
1005     }
1006   }
1007
1008   return true;
1009 }
1010
1011 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
1012
1013 }  // namespace gles2
1014 }  // namespace gpu
1015