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     // -- glGetFramebufferAttachmentParameteriv
 239     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
 240       return 1;
 241     case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
 242       return 1;
 243     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
 244       return 1;
 245     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
 246       return 1;
 247     // -- glGetFramebufferAttachmentParameteriv with
 248     //    GL_EXT_multisampled_render_to_texture
 249     case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
 250       return 1;
 251     // -- glGetFramebufferAttachmentParameteriv with
 252     //    GL_EXT_sRGB
 253     case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT:
 254       return 1;
 255
 256     // -- glGetProgramiv
 257     case GL_DELETE_STATUS:
 258       return 1;
 259     case GL_LINK_STATUS:
 260       return 1;
 261     case GL_VALIDATE_STATUS:
 262       return 1;
 263     case GL_INFO_LOG_LENGTH:
 264       return 1;
 265     case GL_ATTACHED_SHADERS:
 266       return 1;
 267     case GL_ACTIVE_ATTRIBUTES:
 268       return 1;
 269     case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 270       return 1;
 271     case GL_ACTIVE_UNIFORMS:
 272       return 1;
 273     case GL_ACTIVE_UNIFORM_MAX_LENGTH:
 274       return 1;
 275
 276     // -- glGetRenderbufferAttachmentParameteriv
 277     case GL_RENDERBUFFER_WIDTH:
 278       return 1;
 279     case GL_RENDERBUFFER_HEIGHT:
 280       return 1;
 281     case GL_RENDERBUFFER_INTERNAL_FORMAT:
 282       return 1;
 283     case GL_RENDERBUFFER_RED_SIZE:
 284       return 1;
 285     case GL_RENDERBUFFER_GREEN_SIZE:
 286       return 1;
 287     case GL_RENDERBUFFER_BLUE_SIZE:
 288       return 1;
 289     case GL_RENDERBUFFER_ALPHA_SIZE:
 290       return 1;
 291     case GL_RENDERBUFFER_DEPTH_SIZE:
 292       return 1;
 293     case GL_RENDERBUFFER_STENCIL_SIZE:
 294       return 1;
 295     // -- glGetRenderbufferAttachmentParameteriv with
 296     //    GL_EXT_multisampled_render_to_texture
 297     case GL_RENDERBUFFER_SAMPLES_EXT:
 298       return 1;
 299
 300     // -- glGetShaderiv
 301     case GL_SHADER_TYPE:
 302       return 1;
 303     // Already defined under glGetFramebufferAttachemntParameteriv.
 304     // case GL_DELETE_STATUS:
 305     //   return 1;
 306     case GL_COMPILE_STATUS:
 307       return 1;
 308     // Already defined under glGetFramebufferAttachemntParameteriv.
 309     // case GL_INFO_LOG_LENGTH:
 310     //   return 1;
 311     case GL_SHADER_SOURCE_LENGTH:
 312       return 1;
 313     case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
 314       return 1;
 315
 316     // -- glGetTexParameterfv, glGetTexParameteriv
 317     case GL_TEXTURE_MAG_FILTER:
 318       return 1;
 319     case GL_TEXTURE_MIN_FILTER:
 320       return 1;
 321     case GL_TEXTURE_WRAP_R:
 322       return 1;
 323     case GL_TEXTURE_WRAP_S:
 324       return 1;
 325     case GL_TEXTURE_WRAP_T:
 326       return 1;
 327     case GL_TEXTURE_COMPARE_FUNC:
 328       return 1;
 329     case GL_TEXTURE_COMPARE_MODE:
 330       return 1;
 331     case GL_TEXTURE_MAX_LOD:
 332       return 1;
 333     case GL_TEXTURE_MIN_LOD:
 334       return 1;
 335     case GL_TEXTURE_BASE_LEVEL:
 336       return 1;
 337     case GL_TEXTURE_MAX_LEVEL:
 338       return 1;
 339     case GL_TEXTURE_IMMUTABLE_FORMAT:
 340       return 1;
 341     case GL_TEXTURE_IMMUTABLE_LEVELS:
 342       return 1;
 343     case GL_TEXTURE_MAX_ANISOTROPY_EXT:
 344       return 1;
 345
 346     // -- glGetVertexAttrib
 347     case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
 348       return 1;
 349     case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
 350       return 1;
 351     case GL_VERTEX_ATTRIB_ARRAY_SIZE:
 352       return 1;
 353     case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
 354       return 1;
 355     case GL_VERTEX_ATTRIB_ARRAY_TYPE:
 356       return 1;
 357     case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
 358       return 1;
 359     case GL_CURRENT_VERTEX_ATTRIB:
 360       return 4;
 361     case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
 362       return 1;
 363     case GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
 364       return 1;
 365
 366     // -- glGetSynciv
 367     case GL_OBJECT_TYPE:
 368       return 1;
 369     case GL_SYNC_STATUS:
 370       return 1;
 371     case GL_SYNC_CONDITION:
 372       return 1;
 373     case GL_SYNC_FLAGS:
 374       return 1;
 375
 376     // -- glHint with GL_OES_standard_derivatives
 377     case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
 378       return 1;
 379
 380     // Chromium internal bind_generates_resource query
 381     case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
 382       return 1;
 383
 384     // bad enum
 385     default:
 386       return 0;
 387   }
 388 }
 389
 390 namespace {
 391
 392 // Return the number of elements per group of a specified format.
 393 int ElementsPerGroup(int format, int type) {
 394   switch (type) {
 395     case GL_UNSIGNED_SHORT_5_6_5:
 396     case GL_UNSIGNED_SHORT_4_4_4_4:
 397     case GL_UNSIGNED_SHORT_5_5_5_1:
 398     case GL_UNSIGNED_INT_24_8_OES:
 399     case GL_UNSIGNED_INT_2_10_10_10_REV:
 400     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 401     case GL_UNSIGNED_INT_5_9_9_9_REV:
 402     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 403        return 1;
 404     default:
 405        break;
 406     }
 407
 408     switch (format) {
 409     case GL_RGB:
 410     case GL_RGB_INTEGER:
 411     case GL_SRGB_EXT:
 412        return 3;
 413     case GL_LUMINANCE_ALPHA:
 414     case GL_RG_EXT:
 415     case GL_RG_INTEGER:
 416        return 2;
 417     case GL_RGBA:
 418     case GL_RGBA_INTEGER:
 419     case GL_BGRA_EXT:
 420     case GL_SRGB_ALPHA_EXT:
 421        return 4;
 422     case GL_ALPHA:
 423     case GL_LUMINANCE:
 424     case GL_DEPTH_COMPONENT:
 425     case GL_DEPTH_COMPONENT24_OES:
 426     case GL_DEPTH_COMPONENT32_OES:
 427     case GL_DEPTH_COMPONENT16:
 428     case GL_DEPTH24_STENCIL8_OES:
 429     case GL_DEPTH_STENCIL_OES:
 430     case GL_RED_EXT:
 431     case GL_RED_INTEGER:
 432        return 1;
 433     default:
 434        return 0;
 435   }
 436 }
 437
 438 // Return the number of bytes per element, based on the element type.
 439 int BytesPerElement(int type) {
 440   switch (type) {
 441     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 442       return 8;
 443     case GL_FLOAT:
 444     case GL_UNSIGNED_INT_24_8_OES:
 445     case GL_UNSIGNED_INT:
 446     case GL_UNSIGNED_INT_2_10_10_10_REV:
 447     case GL_UNSIGNED_INT_10F_11F_11F_REV:
 448     case GL_UNSIGNED_INT_5_9_9_9_REV:
 449       return 4;
 450     case GL_HALF_FLOAT_OES:
 451     case GL_UNSIGNED_SHORT:
 452     case GL_SHORT:
 453     case GL_UNSIGNED_SHORT_5_6_5:
 454     case GL_UNSIGNED_SHORT_4_4_4_4:
 455     case GL_UNSIGNED_SHORT_5_5_5_1:
 456        return 2;
 457     case GL_UNSIGNED_BYTE:
 458     case GL_BYTE:
 459        return 1;
 460     default:
 461        return 0;
 462   }
 463 }
 464
 465 }  // anonymous namespace
 466
 467 uint32 GLES2Util::ComputeImageGroupSize(int format, int type) {
 468   int bytes_per_element = BytesPerElement(type);
 469   DCHECK_GE(8, bytes_per_element);
 470   int elements_per_group = ElementsPerGroup(format, type);
 471   DCHECK_GE(4, elements_per_group);
 472   return  bytes_per_element * elements_per_group;
 473 }
 474
 475 bool GLES2Util::ComputeImagePaddedRowSize(
 476         int width, int format, int type, int unpack_alignment,
 477         uint32* padded_row_size) {
 478   DCHECK(unpack_alignment == 1 || unpack_alignment == 2 ||
 479          unpack_alignment == 4 || unpack_alignment == 8);
 480   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 481   uint32 unpadded_row_size;
 482   if (!SafeMultiplyUint32(width, bytes_per_group, &unpadded_row_size)) {
 483     return false;
 484   }
 485   uint32 temp;
 486   if (!SafeAddUint32(unpadded_row_size, unpack_alignment - 1, &temp)) {
 487       return false;
 488   }
 489   *padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 490   return true;
 491 }
 492
 493 // Returns the amount of data glTexImage*D or glTexSubImage*D will access.
 494 bool GLES2Util::ComputeImageDataSizes(
 495     int width, int height, int depth, int format, int type,
 496     int unpack_alignment, uint32* size, uint32* ret_unpadded_row_size,
 497     uint32* ret_padded_row_size) {
 498   DCHECK(unpack_alignment == 1 || unpack_alignment == 2 ||
 499          unpack_alignment == 4 || unpack_alignment == 8);
 500   uint32 bytes_per_group = ComputeImageGroupSize(format, type);
 501   uint32 row_size;
 502   if (!SafeMultiplyUint32(width, bytes_per_group, &row_size)) {
 503     return false;
 504   }
 505   uint32 num_of_rows;
 506   if (!SafeMultiplyUint32(height, depth, &num_of_rows)) {
 507     return false;
 508   }
 509   if (num_of_rows > 1) {
 510     uint32 temp;
 511     if (!SafeAddUint32(row_size, unpack_alignment - 1, &temp)) {
 512       return false;
 513     }
 514     uint32 padded_row_size = (temp / unpack_alignment) * unpack_alignment;
 515     uint32 size_of_all_but_last_row;
 516     if (!SafeMultiplyUint32((num_of_rows - 1), padded_row_size,
 517                             &size_of_all_but_last_row)) {
 518       return false;
 519     }
 520     if (!SafeAddUint32(size_of_all_but_last_row, row_size, size)) {
 521       return false;
 522     }
 523     if (ret_padded_row_size) {
 524       *ret_padded_row_size = padded_row_size;
 525     }
 526   } else {
 527     *size = row_size;
 528     if (ret_padded_row_size) {
 529       *ret_padded_row_size = row_size;
 530     }
 531   }
 532   if (ret_unpadded_row_size) {
 533     *ret_unpadded_row_size = row_size;
 534   }
 535
 536   return true;
 537 }
 538
 539 size_t GLES2Util::RenderbufferBytesPerPixel(int format) {
 540   switch (format) {
 541     case GL_STENCIL_INDEX8:
 542       return 1;
 543     case GL_RGBA4:
 544     case GL_RGB565:
 545     case GL_RGB5_A1:
 546     case GL_DEPTH_COMPONENT16:
 547       return 2;
 548     case GL_RGB:
 549     case GL_RGBA:
 550     case GL_DEPTH24_STENCIL8_OES:
 551     case GL_RGB8_OES:
 552     case GL_RGBA8_OES:
 553     case GL_DEPTH_COMPONENT24_OES:
 554       return 4;
 555     default:
 556       return 0;
 557   }
 558 }
 559
 560 uint32 GLES2Util::GetElementSizeForUniformType(int type) {
 561   switch (type) {
 562     case GL_FLOAT:
 563     case GL_FLOAT_VEC2:
 564     case GL_FLOAT_VEC3:
 565     case GL_FLOAT_VEC4:
 566     case GL_FLOAT_MAT2:
 567     case GL_FLOAT_MAT3:
 568     case GL_FLOAT_MAT4:
 569       return sizeof(GLfloat);
 570     case GL_INT:
 571     case GL_INT_VEC2:
 572     case GL_INT_VEC3:
 573     case GL_INT_VEC4:
 574     case GL_BOOL:
 575     case GL_BOOL_VEC2:
 576     case GL_BOOL_VEC3:
 577     case GL_BOOL_VEC4:
 578     case GL_SAMPLER_2D:
 579     case GL_SAMPLER_CUBE:
 580     case GL_SAMPLER_2D_RECT_ARB:  // extension.
 581     case GL_SAMPLER_EXTERNAL_OES:  // extension.
 582       return sizeof(GLint);
 583
 584     // ES3 types.
 585     case GL_UNSIGNED_INT:
 586     case GL_UNSIGNED_INT_VEC2:
 587     case GL_UNSIGNED_INT_VEC3:
 588     case GL_UNSIGNED_INT_VEC4:
 589       return sizeof(GLuint);
 590     case GL_SAMPLER_3D:
 591     case GL_SAMPLER_2D_SHADOW:
 592     case GL_SAMPLER_2D_ARRAY:
 593     case GL_SAMPLER_2D_ARRAY_SHADOW:
 594     case GL_SAMPLER_CUBE_SHADOW:
 595     case GL_INT_SAMPLER_2D:
 596     case GL_INT_SAMPLER_3D:
 597     case GL_INT_SAMPLER_CUBE:
 598     case GL_INT_SAMPLER_2D_ARRAY:
 599     case GL_UNSIGNED_INT_SAMPLER_2D:
 600     case GL_UNSIGNED_INT_SAMPLER_3D:
 601     case GL_UNSIGNED_INT_SAMPLER_CUBE:
 602     case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
 603       return sizeof(GLint);
 604     case GL_FLOAT_MAT2x3:
 605     case GL_FLOAT_MAT3x2:
 606     case GL_FLOAT_MAT2x4:
 607     case GL_FLOAT_MAT4x2:
 608     case GL_FLOAT_MAT3x4:
 609     case GL_FLOAT_MAT4x3:
 610       return sizeof(GLfloat);
 611
 612     default:
 613       return 0;
 614   }
 615 }
 616
 617 uint32 GLES2Util::GetElementCountForUniformType(int type) {
 618   switch (type) {
 619     case GL_FLOAT:
 620     case GL_INT:
 621     case GL_BOOL:
 622     case GL_SAMPLER_2D:
 623     case GL_SAMPLER_CUBE:
 624     case GL_SAMPLER_2D_RECT_ARB:  // extension.
 625     case GL_SAMPLER_EXTERNAL_OES:  // extension.
 626       return 1;
 627     case GL_FLOAT_VEC2:
 628     case GL_INT_VEC2:
 629     case GL_BOOL_VEC2:
 630       return 2;
 631     case GL_FLOAT_VEC3:
 632     case GL_INT_VEC3:
 633     case GL_BOOL_VEC3:
 634       return 3;
 635     case GL_FLOAT_VEC4:
 636     case GL_INT_VEC4:
 637     case GL_BOOL_VEC4:
 638     case GL_FLOAT_MAT2:
 639       return 4;
 640     case GL_FLOAT_MAT3:
 641       return 9;
 642     case GL_FLOAT_MAT4:
 643       return 16;
 644
 645     // ES3 types.
 646     case GL_UNSIGNED_INT:
 647     case GL_SAMPLER_3D:
 648     case GL_SAMPLER_2D_SHADOW:
 649     case GL_SAMPLER_2D_ARRAY:
 650     case GL_SAMPLER_2D_ARRAY_SHADOW:
 651     case GL_SAMPLER_CUBE_SHADOW:
 652     case GL_INT_SAMPLER_2D:
 653     case GL_INT_SAMPLER_3D:
 654     case GL_INT_SAMPLER_CUBE:
 655     case GL_INT_SAMPLER_2D_ARRAY:
 656     case GL_UNSIGNED_INT_SAMPLER_2D:
 657     case GL_UNSIGNED_INT_SAMPLER_3D:
 658     case GL_UNSIGNED_INT_SAMPLER_CUBE:
 659     case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
 660       return 1;
 661     case GL_UNSIGNED_INT_VEC2:
 662       return 2;
 663     case GL_UNSIGNED_INT_VEC3:
 664       return 3;
 665     case GL_UNSIGNED_INT_VEC4:
 666       return 4;
 667     case GL_FLOAT_MAT2x3:
 668     case GL_FLOAT_MAT3x2:
 669       return 6;
 670     case GL_FLOAT_MAT2x4:
 671     case GL_FLOAT_MAT4x2:
 672       return 8;
 673     case GL_FLOAT_MAT3x4:
 674     case GL_FLOAT_MAT4x3:
 675       return 12;
 676
 677     default:
 678       return 0;
 679   }
 680 }
 681
 682 size_t GLES2Util::GetGLTypeSizeForTexturesAndBuffers(uint32 type) {
 683   switch (type) {
 684     case GL_BYTE:
 685       return sizeof(GLbyte);  // NOLINT
 686     case GL_UNSIGNED_BYTE:
 687       return sizeof(GLubyte);  // NOLINT
 688     case GL_SHORT:
 689       return sizeof(GLshort);  // NOLINT
 690     case GL_UNSIGNED_SHORT:
 691       return sizeof(GLushort);  // NOLINT
 692     case GL_INT:
 693       return sizeof(GLint);  // NOLINT
 694     case GL_UNSIGNED_INT:
 695       return sizeof(GLuint);  // NOLINT
 696     case GL_FLOAT:
 697       return sizeof(GLfloat);  // NOLINT
 698     case GL_FIXED:
 699       return sizeof(GLfixed);  // NOLINT
 700     default:
 701       return 0;
 702   }
 703 }
 704
 705 size_t GLES2Util::GetGLTypeSizeForPathCoordType(uint32 type) {
 706   switch (type) {
 707     case GL_BYTE:
 708       return sizeof(GLbyte);  // NOLINT
 709     case GL_UNSIGNED_BYTE:
 710       return sizeof(GLubyte);  // NOLINT
 711     case GL_SHORT:
 712       return sizeof(GLshort);  // NOLINT
 713     case GL_UNSIGNED_SHORT:
 714       return sizeof(GLushort);  // NOLINT
 715     case GL_FLOAT:
 716       return sizeof(GLfloat);  // NOLINT
 717     default:
 718       return 0;
 719   }
 720 }
 721
 722 uint32 GLES2Util::GLErrorToErrorBit(uint32 error) {
 723   switch (error) {
 724     case GL_INVALID_ENUM:
 725       return gl_error_bit::kInvalidEnum;
 726     case GL_INVALID_VALUE:
 727       return gl_error_bit::kInvalidValue;
 728     case GL_INVALID_OPERATION:
 729       return gl_error_bit::kInvalidOperation;
 730     case GL_OUT_OF_MEMORY:
 731       return gl_error_bit::kOutOfMemory;
 732     case GL_INVALID_FRAMEBUFFER_OPERATION:
 733       return gl_error_bit::kInvalidFrameBufferOperation;
 734     case GL_CONTEXT_LOST_KHR:
 735       return gl_error_bit::kContextLost;
 736     default:
 737       NOTREACHED();
 738       return gl_error_bit::kNoError;
 739   }
 740 }
 741
 742 uint32 GLES2Util::GLErrorBitToGLError(uint32 error_bit) {
 743   switch (error_bit) {
 744     case gl_error_bit::kInvalidEnum:
 745       return GL_INVALID_ENUM;
 746     case gl_error_bit::kInvalidValue:
 747       return GL_INVALID_VALUE;
 748     case gl_error_bit::kInvalidOperation:
 749       return GL_INVALID_OPERATION;
 750     case gl_error_bit::kOutOfMemory:
 751       return GL_OUT_OF_MEMORY;
 752     case gl_error_bit::kInvalidFrameBufferOperation:
 753       return GL_INVALID_FRAMEBUFFER_OPERATION;
 754     case gl_error_bit::kContextLost:
 755       return GL_CONTEXT_LOST_KHR;
 756     default:
 757       NOTREACHED();
 758       return GL_NO_ERROR;
 759   }
 760 }
 761
 762 uint32 GLES2Util::IndexToGLFaceTarget(int index) {
 763   static uint32 faces[] = {
 764     GL_TEXTURE_CUBE_MAP_POSITIVE_X,
 765     GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 766     GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 767     GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 768     GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 769     GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 770   };
 771   return faces[index];
 772 }
 773
 774 size_t GLES2Util::GLTargetToFaceIndex(uint32 target) {
 775   switch (target) {
 776     case GL_TEXTURE_2D:
 777     case GL_TEXTURE_EXTERNAL_OES:
 778     case GL_TEXTURE_RECTANGLE_ARB:
 779     case GL_TEXTURE_3D:
 780     case GL_TEXTURE_2D_ARRAY:
 781       return 0;
 782     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 783       return 0;
 784     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 785       return 1;
 786     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 787       return 2;
 788     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 789       return 3;
 790     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 791       return 4;
 792     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 793       return 5;
 794     default:
 795       NOTREACHED();
 796       return 0;
 797   }
 798 }
 799
 800 uint32 GLES2Util::GetPreferredGLReadPixelsFormat(uint32 internal_format) {
 801   switch (internal_format) {
 802     case GL_RGB16F_EXT:
 803     case GL_RGB32F_EXT:
 804       return GL_RGB;
 805     case GL_RGBA16F_EXT:
 806     case GL_RGBA32F_EXT:
 807       return GL_RGBA;
 808     default:
 809       return GL_RGBA;
 810   }
 811 }
 812
 813 uint32 GLES2Util::GetPreferredGLReadPixelsType(
 814     uint32 internal_format, uint32 texture_type) {
 815   switch (internal_format) {
 816     case GL_RGBA32F_EXT:
 817     case GL_RGB32F_EXT:
 818       return GL_FLOAT;
 819     case GL_RGBA16F_EXT:
 820     case GL_RGB16F_EXT:
 821       return GL_HALF_FLOAT_OES;
 822     case GL_RGBA:
 823     case GL_RGB:
 824       // Unsized internal format, check the type
 825       switch (texture_type) {
 826         case GL_FLOAT:
 827         case GL_HALF_FLOAT_OES:
 828           return GL_FLOAT;
 829         default:
 830           return GL_UNSIGNED_BYTE;
 831       }
 832     default:
 833       return GL_UNSIGNED_BYTE;
 834   }
 835 }
 836
 837 uint32 GLES2Util::GetChannelsForFormat(int format) {
 838   switch (format) {
 839     case GL_ALPHA:
 840     case GL_ALPHA16F_EXT:
 841     case GL_ALPHA32F_EXT:
 842       return kAlpha;
 843     case GL_LUMINANCE:
 844       return kRGB;
 845     case GL_LUMINANCE_ALPHA:
 846       return kRGBA;
 847     case GL_RGB:
 848     case GL_RGB8_OES:
 849     case GL_RGB565:
 850     case GL_RGB16F_EXT:
 851     case GL_RGB32F_EXT:
 852     case GL_SRGB_EXT:
 853     case GL_SRGB8:
 854     case GL_RGB8_SNORM:
 855     case GL_R11F_G11F_B10F:
 856     case GL_RGB9_E5:
 857     case GL_RGB8UI:
 858     case GL_RGB8I:
 859     case GL_RGB16UI:
 860     case GL_RGB16I:
 861     case GL_RGB32UI:
 862     case GL_RGB32I:
 863       return kRGB;
 864     case GL_BGRA_EXT:
 865     case GL_BGRA8_EXT:
 866     case GL_RGBA16F_EXT:
 867     case GL_RGBA32F_EXT:
 868     case GL_RGBA:
 869     case GL_RGBA8_OES:
 870     case GL_RGBA4:
 871     case GL_RGB5_A1:
 872     case GL_SRGB_ALPHA_EXT:
 873     case GL_SRGB8_ALPHA8_EXT:
 874     case GL_RGBA8_SNORM:
 875     case GL_RGB10_A2:
 876     case GL_RGBA8UI:
 877     case GL_RGBA8I:
 878     case GL_RGB10_A2UI:
 879     case GL_RGBA16UI:
 880     case GL_RGBA16I:
 881     case GL_RGBA32UI:
 882     case GL_RGBA32I:
 883       return kRGBA;
 884     case GL_DEPTH_COMPONENT32_OES:
 885     case GL_DEPTH_COMPONENT24_OES:
 886     case GL_DEPTH_COMPONENT16:
 887     case GL_DEPTH_COMPONENT:
 888     case GL_DEPTH_COMPONENT32F:
 889       return kDepth;
 890     case GL_STENCIL_INDEX8:
 891       return kStencil;
 892     case GL_DEPTH_STENCIL_OES:
 893     case GL_DEPTH24_STENCIL8_OES:
 894     case GL_DEPTH32F_STENCIL8:
 895       return kDepth | kStencil;
 896     case GL_RED_EXT:
 897     case GL_R8:
 898     case GL_R8_SNORM:
 899     case GL_R16F:
 900     case GL_R32F:
 901     case GL_R8UI:
 902     case GL_R8I:
 903     case GL_R16UI:
 904     case GL_R16I:
 905     case GL_R32UI:
 906     case GL_R32I:
 907       return kRed;
 908     case GL_RG_EXT:
 909     case GL_RG8:
 910     case GL_RG8_SNORM:
 911     case GL_RG16F:
 912     case GL_RG32F:
 913     case GL_RG8UI:
 914     case GL_RG8I:
 915     case GL_RG16UI:
 916     case GL_RG16I:
 917     case GL_RG32UI:
 918     case GL_RG32I:
 919       return kRed | kGreen;
 920     default:
 921       return 0x0000;
 922   }
 923 }
 924
 925 uint32 GLES2Util::GetChannelsNeededForAttachmentType(
 926     int type, uint32 max_color_attachments) {
 927   switch (type) {
 928     case GL_DEPTH_ATTACHMENT:
 929       return kDepth;
 930     case GL_STENCIL_ATTACHMENT:
 931       return kStencil;
 932     default:
 933       if (type >= GL_COLOR_ATTACHMENT0 &&
 934           type < static_cast<int>(
 935               GL_COLOR_ATTACHMENT0 + max_color_attachments)) {
 936         return kRGBA;
 937       }
 938       return 0x0000;
 939   }
 940 }
 941
 942 std::string GLES2Util::GetStringEnum(uint32 value) {
 943   const EnumToString* entry = enum_to_string_table_;
 944   const EnumToString* end = entry + enum_to_string_table_len_;
 945   for (;entry < end; ++entry) {
 946     if (value == entry->value) {
 947       return entry->name;
 948     }
 949   }
 950   std::stringstream ss;
 951   ss.fill('0');
 952   ss.width(value < 0x10000 ? 4 : 8);
 953   ss << std::hex << value;
 954   return "0x" + ss.str();
 955 }
 956
 957 std::string GLES2Util::GetStringError(uint32 value) {
 958   static EnumToString string_table[] = {
 959     { GL_NONE, "GL_NONE" },
 960   };
 961   return GLES2Util::GetQualifiedEnumString(
 962       string_table, arraysize(string_table), value);
 963 }
 964
 965 std::string GLES2Util::GetStringBool(uint32 value) {
 966   return value ? "GL_TRUE" : "GL_FALSE";
 967 }
 968
 969 std::string GLES2Util::GetQualifiedEnumString(
 970     const EnumToString* table, size_t count, uint32 value) {
 971   for (const EnumToString* end = table + count; table < end; ++table) {
 972     if (table->value == value) {
 973       return table->name;
 974     }
 975   }
 976   return GetStringEnum(value);
 977 }
 978
 979 bool GLES2Util::ParseUniformName(
 980     const std::string& name,
 981     size_t* array_pos,
 982     int* element_index,
 983     bool* getting_array) {
 984   if (name.empty())
 985     return false;
 986   bool getting_array_location = false;
 987   size_t open_pos = std::string::npos;
 988   base::CheckedNumeric<int> index = 0;
 989   if (name[name.size() - 1] == ']') {
 990     if (name.size() < 3) {
 991       return false;
 992     }
 993     open_pos = name.find_last_of('[');
 994     if (open_pos == std::string::npos ||
 995         open_pos >= name.size() - 2) {
 996       return false;
 997     }
 998     size_t last = name.size() - 1;
 999     for (size_t pos = open_pos + 1; pos < last; ++pos) {
1000       int8 digit = name[pos] - '0';
1001       if (digit < 0 || digit > 9) {
1002         return false;
1003       }
1004       index = index * 10 + digit;
1005     }
1006     if (!index.IsValid()) {
1007       return false;
1008     }
1009     getting_array_location = true;
1010   }
1011   *getting_array = getting_array_location;
1012   *element_index = index.ValueOrDie();
1013   *array_pos = open_pos;
1014   return true;
1015 }
1016
1017 size_t GLES2Util::CalcClearBufferivDataCount(int buffer) {
1018   switch (buffer) {
1019     case GL_COLOR:
1020       return 4;
1021     case GL_STENCIL:
1022       return 1;
1023     default:
1024       return 0;
1025   }
1026 }
1027
1028 size_t GLES2Util::CalcClearBufferfvDataCount(int buffer) {
1029   switch (buffer) {
1030     case GL_COLOR:
1031       return 4;
1032     case GL_DEPTH:
1033       return 1;
1034     default:
1035       return 0;
1036   }
1037 }
1038
1039 // static
1040 void GLES2Util::MapUint64ToTwoUint32(
1041     uint64_t v64, uint32_t* v32_0, uint32_t* v32_1) {
1042   DCHECK(v32_0 && v32_1);
1043   *v32_0 = static_cast<uint32_t>(v64 & 0xFFFFFFFF);
1044   *v32_1 = static_cast<uint32_t>((v64 & 0xFFFFFFFF00000000) >> 32);
1045 }
1046
1047 // static
1048 uint64_t GLES2Util::MapTwoUint32ToUint64(uint32_t v32_0, uint32_t v32_1) {
1049   uint64_t v64 = v32_1;
1050   return (v64 << 32) | v32_0;
1051 }
1052
1053 // static
1054 uint32_t GLES2Util::MapBufferTargetToBindingEnum(uint32_t target) {
1055   switch (target) {
1056     case GL_ARRAY_BUFFER:
1057       return GL_ARRAY_BUFFER_BINDING;
1058     case GL_COPY_READ_BUFFER:
1059       return GL_COPY_READ_BUFFER_BINDING;
1060     case GL_COPY_WRITE_BUFFER:
1061       return GL_COPY_WRITE_BUFFER_BINDING;
1062     case GL_ELEMENT_ARRAY_BUFFER:
1063       return GL_ELEMENT_ARRAY_BUFFER_BINDING;
1064     case GL_PIXEL_PACK_BUFFER:
1065       return GL_PIXEL_PACK_BUFFER_BINDING;
1066     case GL_PIXEL_UNPACK_BUFFER:
1067       return GL_PIXEL_UNPACK_BUFFER_BINDING;
1068     case GL_TRANSFORM_FEEDBACK_BUFFER:
1069       return GL_TRANSFORM_FEEDBACK_BUFFER_BINDING;
1070     case GL_UNIFORM_BUFFER:
1071       return GL_UNIFORM_BUFFER_BINDING;
1072     default:
1073       return 0;
1074   }
1075 }
1076
1077
1078 namespace {
1079
1080 // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in
1081 // the 16-bit range are the same as used by EGL. Those outside the 16-bit range
1082 // are unique to Chromium. Attributes are matched using a closest fit algorithm.
1083
1084 // From <EGL/egl.h>.
1085 const int32 kAlphaSize       = 0x3021;  // EGL_ALPHA_SIZE
1086 const int32 kBlueSize        = 0x3022;  // EGL_BLUE_SIZE
1087 const int32 kGreenSize       = 0x3023;  // EGL_GREEN_SIZE
1088 const int32 kRedSize         = 0x3024;  // EGL_RED_SIZE
1089 const int32 kDepthSize       = 0x3025;  // EGL_DEPTH_SIZE
1090 const int32 kStencilSize     = 0x3026;  // EGL_STENCIL_SIZE
1091 const int32 kSamples         = 0x3031;  // EGL_SAMPLES
1092 const int32 kSampleBuffers   = 0x3032;  // EGL_SAMPLE_BUFFERS
1093 const int32 kNone            = 0x3038;  // EGL_NONE
1094 const int32 kSwapBehavior    = 0x3093;  // EGL_SWAP_BEHAVIOR
1095 const int32 kBufferPreserved = 0x3094;  // EGL_BUFFER_PRESERVED
1096 const int32 kBufferDestroyed = 0x3095;  // EGL_BUFFER_DESTROYED
1097
1098 // Chromium only.
1099 const int32 kBindGeneratesResource = 0x10000;
1100 const int32 kFailIfMajorPerfCaveat = 0x10001;
1101 const int32 kLoseContextWhenOutOfMemory = 0x10002;
1102 const int32 kWebGLVersion = 0x10003;
1103
1104 }  // namespace
1105
1106 ContextCreationAttribHelper::ContextCreationAttribHelper()
1107     : alpha_size(-1),
1108       blue_size(-1),
1109       green_size(-1),
1110       red_size(-1),
1111       depth_size(-1),
1112       stencil_size(-1),
1113       samples(-1),
1114       sample_buffers(-1),
1115       buffer_preserved(true),
1116       bind_generates_resource(true),
1117       fail_if_major_perf_caveat(false),
1118       lose_context_when_out_of_memory(false),
1119       webgl_version(0) {
1120 }
1121
1122 void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) const {
1123   if (alpha_size != -1) {
1124     attribs->push_back(kAlphaSize);
1125     attribs->push_back(alpha_size);
1126   }
1127   if (blue_size != -1) {
1128     attribs->push_back(kBlueSize);
1129     attribs->push_back(blue_size);
1130   }
1131   if (green_size != -1) {
1132     attribs->push_back(kGreenSize);
1133     attribs->push_back(green_size);
1134   }
1135   if (red_size != -1) {
1136     attribs->push_back(kRedSize);
1137     attribs->push_back(red_size);
1138   }
1139   if (depth_size != -1) {
1140     attribs->push_back(kDepthSize);
1141     attribs->push_back(depth_size);
1142   }
1143   if (stencil_size != -1) {
1144     attribs->push_back(kStencilSize);
1145     attribs->push_back(stencil_size);
1146   }
1147   if (samples != -1) {
1148     attribs->push_back(kSamples);
1149     attribs->push_back(samples);
1150   }
1151   if (sample_buffers != -1) {
1152     attribs->push_back(kSampleBuffers);
1153     attribs->push_back(sample_buffers);
1154   }
1155   attribs->push_back(kSwapBehavior);
1156   attribs->push_back(buffer_preserved ? kBufferPreserved : kBufferDestroyed);
1157   attribs->push_back(kBindGeneratesResource);
1158   attribs->push_back(bind_generates_resource ? 1 : 0);
1159   attribs->push_back(kFailIfMajorPerfCaveat);
1160   attribs->push_back(fail_if_major_perf_caveat ? 1 : 0);
1161   attribs->push_back(kLoseContextWhenOutOfMemory);
1162   attribs->push_back(lose_context_when_out_of_memory ? 1 : 0);
1163   attribs->push_back(kWebGLVersion);
1164   attribs->push_back(webgl_version);
1165   attribs->push_back(kNone);
1166 }
1167
1168 bool ContextCreationAttribHelper::Parse(const std::vector<int32>& attribs) {
1169   for (size_t i = 0; i < attribs.size(); i += 2) {
1170     const int32 attrib = attribs[i];
1171     if (i + 1 >= attribs.size()) {
1172       if (attrib == kNone) {
1173         return true;
1174       }
1175
1176       DLOG(ERROR) << "Missing value after context creation attribute: "
1177                   << attrib;
1178       return false;
1179     }
1180
1181     const int32 value = attribs[i+1];
1182     switch (attrib) {
1183       case kAlphaSize:
1184         alpha_size = value;
1185         break;
1186       case kBlueSize:
1187         blue_size = value;
1188         break;
1189       case kGreenSize:
1190         green_size = value;
1191         break;
1192       case kRedSize:
1193         red_size = value;
1194         break;
1195       case kDepthSize:
1196         depth_size = value;
1197         break;
1198       case kStencilSize:
1199         stencil_size = value;
1200         break;
1201       case kSamples:
1202         samples = value;
1203         break;
1204       case kSampleBuffers:
1205         sample_buffers = value;
1206         break;
1207       case kSwapBehavior:
1208         buffer_preserved = value == kBufferPreserved;
1209         break;
1210       case kBindGeneratesResource:
1211         bind_generates_resource = value != 0;
1212         break;
1213       case kFailIfMajorPerfCaveat:
1214         fail_if_major_perf_caveat = value != 0;
1215         break;
1216       case kLoseContextWhenOutOfMemory:
1217         lose_context_when_out_of_memory = value != 0;
1218         break;
1219       case kWebGLVersion:
1220         webgl_version = value;
1221         break;
1222       case kNone:
1223         // Terminate list, even if more attributes.
1224         return true;
1225       default:
1226         DLOG(ERROR) << "Invalid context creation attribute: " << attrib;
1227         return false;
1228     }
1229   }
1230
1231   return true;
1232 }
1233
1234 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
1235
1236 }  // namespace gles2
1237 }  // namespace gpu
1238