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 <stdio.h>
9#include <GLES2/gl2.h>
10#include <GLES2/gl2ext.h>
11#include <GLES2/gl2extchromium.h>
12
13#include "gpu/command_buffer/common/gles2_cmd_format.h"
14#include "gpu/command_buffer/common/gles2_cmd_utils.h"
15
16namespace gpu {
17namespace gles2 {
18
19namespace gl_error_bit {
20enum GLErrorBit {
21  kNoError = 0,
22  kInvalidEnum = (1 << 0),
23  kInvalidValue = (1 << 1),
24  kInvalidOperation = (1 << 2),
25  kOutOfMemory = (1 << 3),
26  kInvalidFrameBufferOperation = (1 << 4)
27};
28}
29
30int GLES2Util::GLGetNumValuesReturned(int id) const {
31  switch (id) {
32    // -- glGetBooleanv, glGetFloatv, glGetIntergerv
33    case GL_ACTIVE_TEXTURE:
34      return 1;
35    case GL_ALIASED_LINE_WIDTH_RANGE:
36      return 2;
37    case GL_ALIASED_POINT_SIZE_RANGE:
38      return 2;
39    case GL_ALPHA_BITS:
40      return 1;
41    case GL_ARRAY_BUFFER_BINDING:
42      return 1;
43    case GL_BLEND:
44      return 1;
45    case GL_BLEND_COLOR:
46      return 4;
47    case GL_BLEND_DST_ALPHA:
48      return 1;
49    case GL_BLEND_DST_RGB:
50      return 1;
51    case GL_BLEND_EQUATION_ALPHA:
52      return 1;
53    case GL_BLEND_EQUATION_RGB:
54      return 1;
55    case GL_BLEND_SRC_ALPHA:
56      return 1;
57    case GL_BLEND_SRC_RGB:
58      return 1;
59    case GL_BLUE_BITS:
60      return 1;
61    case GL_COLOR_CLEAR_VALUE:
62      return 4;
63    case GL_COLOR_WRITEMASK:
64      return 4;
65    case GL_COMPRESSED_TEXTURE_FORMATS:
66      return num_compressed_texture_formats_;
67    case GL_CULL_FACE:
68      return 1;
69    case GL_CULL_FACE_MODE:
70      return 1;
71    case GL_CURRENT_PROGRAM:
72      return 1;
73    case GL_DEPTH_BITS:
74      return 1;
75    case GL_DEPTH_CLEAR_VALUE:
76      return 1;
77    case GL_DEPTH_FUNC:
78      return 1;
79    case GL_DEPTH_RANGE:
80      return 2;
81    case GL_DEPTH_TEST:
82      return 1;
83    case GL_DEPTH_WRITEMASK:
84      return 1;
85    case GL_DITHER:
86      return 1;
87    case GL_ELEMENT_ARRAY_BUFFER_BINDING:
88      return 1;
89    case GL_FRAMEBUFFER_BINDING:
90      return 1;
91    case GL_FRONT_FACE:
92      return 1;
93    case GL_GENERATE_MIPMAP_HINT:
94      return 1;
95    case GL_GREEN_BITS:
96      return 1;
97    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
98      return 1;
99    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
100      return 1;
101    case GL_LINE_WIDTH:
102      return 1;
103    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
104      return 1;
105    case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
106      return 1;
107    case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
108      return 1;
109    case GL_MAX_RENDERBUFFER_SIZE:
110      return 1;
111    case GL_MAX_TEXTURE_IMAGE_UNITS:
112      return 1;
113    case GL_MAX_TEXTURE_SIZE:
114      return 1;
115    case GL_MAX_VARYING_VECTORS:
116      return 1;
117    case GL_MAX_VERTEX_ATTRIBS:
118      return 1;
119    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
120      return 1;
121    case GL_MAX_VERTEX_UNIFORM_VECTORS:
122      return 1;
123    case GL_MAX_VIEWPORT_DIMS:
124      return 2;
125    case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
126      return 1;
127    case GL_NUM_SHADER_BINARY_FORMATS:
128      return 1;
129    case GL_PACK_ALIGNMENT:
130      return 1;
131    case GL_PACK_REVERSE_ROW_ORDER_ANGLE:
132      return 1;
133    case GL_POLYGON_OFFSET_FACTOR:
134      return 1;
135    case GL_POLYGON_OFFSET_FILL:
136      return 1;
137    case GL_POLYGON_OFFSET_UNITS:
138      return 1;
139    case GL_RED_BITS:
140      return 1;
141    case GL_RENDERBUFFER_BINDING:
142      return 1;
143    case GL_SAMPLE_BUFFERS:
144      return 1;
145    case GL_SAMPLE_COVERAGE_INVERT:
146      return 1;
147    case GL_SAMPLE_COVERAGE_VALUE:
148      return 1;
149    case GL_SAMPLES:
150      return 1;
151    case GL_SCISSOR_BOX:
152      return 4;
153    case GL_SCISSOR_TEST:
154      return 1;
155    case GL_SHADER_BINARY_FORMATS:
156      return num_shader_binary_formats_;
157    case GL_SHADER_COMPILER:
158      return 1;
159    case GL_STENCIL_BACK_FAIL:
160      return 1;
161    case GL_STENCIL_BACK_FUNC:
162      return 1;
163    case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
164      return 1;
165    case GL_STENCIL_BACK_PASS_DEPTH_PASS:
166      return 1;
167    case GL_STENCIL_BACK_REF:
168      return 1;
169    case GL_STENCIL_BACK_VALUE_MASK:
170      return 1;
171    case GL_STENCIL_BACK_WRITEMASK:
172      return 1;
173    case GL_STENCIL_BITS:
174      return 1;
175    case GL_STENCIL_CLEAR_VALUE:
176      return 1;
177    case GL_STENCIL_FAIL:
178      return 1;
179    case GL_STENCIL_FUNC:
180      return 1;
181    case GL_STENCIL_PASS_DEPTH_FAIL:
182      return 1;
183    case GL_STENCIL_PASS_DEPTH_PASS:
184      return 1;
185    case GL_STENCIL_REF:
186      return 1;
187    case GL_STENCIL_TEST:
188      return 1;
189    case GL_STENCIL_VALUE_MASK:
190      return 1;
191    case GL_STENCIL_WRITEMASK:
192      return 1;
193    case GL_SUBPIXEL_BITS:
194      return 1;
195    case GL_TEXTURE_BINDING_2D:
196      return 1;
197    case GL_TEXTURE_BINDING_CUBE_MAP:
198      return 1;
199    case GL_TEXTURE_BINDING_EXTERNAL_OES:
200      return 1;
201    case GL_TEXTURE_BINDING_RECTANGLE_ARB:
202      return 1;
203    case GL_TEXTURE_IMMUTABLE_FORMAT_EXT:
204      return 1;
205    case GL_UNPACK_ALIGNMENT:
206      return 1;
207    case GL_VIEWPORT:
208      return 4;
209    // -- glGetBooleanv, glGetFloatv, glGetIntergerv with
210    //    GL_CHROMIUM_framebuffer_multisample
211    case GL_MAX_SAMPLES_EXT:
212      return 1;
213    case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
214      return 1;
215
216    // -- glGetBufferParameteriv
217    case GL_BUFFER_SIZE:
218      return 1;
219    case GL_BUFFER_USAGE:
220      return 1;
221
222    // -- glGetFramebufferAttachmentParameteriv
223    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
224      return 1;
225    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
226      return 1;
227    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
228      return 1;
229    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
230      return 1;
231    // -- glGetFramebufferAttachmentParameteriv with
232    //    GL_EXT_multisampled_render_to_texture
233    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
234      return 1;
235
236    // -- glGetProgramiv
237    case GL_DELETE_STATUS:
238      return 1;
239    case GL_LINK_STATUS:
240      return 1;
241    case GL_VALIDATE_STATUS:
242      return 1;
243    case GL_INFO_LOG_LENGTH:
244      return 1;
245    case GL_ATTACHED_SHADERS:
246      return 1;
247    case GL_ACTIVE_ATTRIBUTES:
248      return 1;
249    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
250      return 1;
251    case GL_ACTIVE_UNIFORMS:
252      return 1;
253    case GL_ACTIVE_UNIFORM_MAX_LENGTH:
254      return 1;
255
256
257    // -- glGetRenderbufferAttachmentParameteriv
258    case GL_RENDERBUFFER_WIDTH:
259      return 1;
260    case GL_RENDERBUFFER_HEIGHT:
261      return 1;
262    case GL_RENDERBUFFER_INTERNAL_FORMAT:
263      return 1;
264    case GL_RENDERBUFFER_RED_SIZE:
265      return 1;
266    case GL_RENDERBUFFER_GREEN_SIZE:
267      return 1;
268    case GL_RENDERBUFFER_BLUE_SIZE:
269      return 1;
270    case GL_RENDERBUFFER_ALPHA_SIZE:
271      return 1;
272    case GL_RENDERBUFFER_DEPTH_SIZE:
273      return 1;
274    case GL_RENDERBUFFER_STENCIL_SIZE:
275      return 1;
276    // -- glGetRenderbufferAttachmentParameteriv with
277    //    GL_EXT_multisampled_render_to_texture
278    case GL_RENDERBUFFER_SAMPLES_EXT:
279      return 1;
280
281    // -- glGetShaderiv
282    case GL_SHADER_TYPE:
283      return 1;
284    // Already defined under glGetFramebufferAttachemntParameteriv.
285    // case GL_DELETE_STATUS:
286    //   return 1;
287    case GL_COMPILE_STATUS:
288      return 1;
289    // Already defined under glGetFramebufferAttachemntParameteriv.
290    // case GL_INFO_LOG_LENGTH:
291    //   return 1;
292    case GL_SHADER_SOURCE_LENGTH:
293      return 1;
294    case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
295      return 1;
296
297    // -- glGetTexParameterfv, glGetTexParameteriv
298    case GL_TEXTURE_MAG_FILTER:
299      return 1;
300    case GL_TEXTURE_MIN_FILTER:
301      return 1;
302    case GL_TEXTURE_WRAP_S:
303      return 1;
304    case GL_TEXTURE_WRAP_T:
305      return 1;
306    case GL_TEXTURE_MAX_ANISOTROPY_EXT:
307      return 1;
308
309    // -- glGetVertexAttribfv, glGetVertexAttribiv
310    case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
311      return 1;
312    case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
313      return 1;
314    case GL_VERTEX_ATTRIB_ARRAY_SIZE:
315      return 1;
316    case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
317      return 1;
318    case GL_VERTEX_ATTRIB_ARRAY_TYPE:
319      return 1;
320    case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
321      return 1;
322    case GL_CURRENT_VERTEX_ATTRIB:
323      return 4;
324
325    // -- glHint with GL_OES_standard_derivatives
326    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
327      return 1;
328
329    // bad enum
330    default:
331      return 0;
332  }
333}
334
335namespace {
336
337// Return the number of elements per group of a specified format.
338int ElementsPerGroup(int format, int type) {
339  switch (type) {
340    case GL_UNSIGNED_SHORT_5_6_5:
341    case GL_UNSIGNED_SHORT_4_4_4_4:
342    case GL_UNSIGNED_SHORT_5_5_5_1:
343    case GL_UNSIGNED_INT_24_8_OES:
344       return 1;
345    default:
346       break;
347    }
348
349    switch (format) {
350    case GL_RGB:
351       return 3;
352    case GL_LUMINANCE_ALPHA:
353       return 2;
354    case GL_RGBA:
355    case GL_BGRA_EXT:
356       return 4;
357    case GL_ALPHA:
358    case GL_LUMINANCE:
359    case GL_DEPTH_COMPONENT:
360    case GL_DEPTH_COMPONENT24_OES:
361    case GL_DEPTH_COMPONENT32_OES:
362    case GL_DEPTH_COMPONENT16:
363    case GL_DEPTH24_STENCIL8_OES:
364    case GL_DEPTH_STENCIL_OES:
365       return 1;
366    default:
367       return 0;
368  }
369}
370
371// Return the number of bytes per element, based on the element type.
372int BytesPerElement(int type) {
373  switch (type) {
374    case GL_FLOAT:
375    case GL_UNSIGNED_INT_24_8_OES:
376    case GL_UNSIGNED_INT:
377      return 4;
378    case GL_HALF_FLOAT_OES:
379    case GL_UNSIGNED_SHORT:
380    case GL_SHORT:
381    case GL_UNSIGNED_SHORT_5_6_5:
382    case GL_UNSIGNED_SHORT_4_4_4_4:
383    case GL_UNSIGNED_SHORT_5_5_5_1:
384       return 2;
385    case GL_UNSIGNED_BYTE:
386    case GL_BYTE:
387       return 1;
388    default:
389       return 0;
390  }
391}
392
393}  // anonymous namespace
394
395uint32 GLES2Util::ComputeImageGroupSize(int format, int type) {
396  return BytesPerElement(type) * ElementsPerGroup(format, type);
397}
398
399bool GLES2Util::ComputeImagePaddedRowSize(
400        int width, int format, int type, int unpack_alignment,
401        uint32* padded_row_size) {
402  uint32 bytes_per_group = ComputeImageGroupSize(format, type);
403  uint32 unpadded_row_size;
404  if (!SafeMultiplyUint32(width, bytes_per_group, &unpadded_row_size)) {
405    return false;
406  }
407  uint32 temp;
408  if (!SafeAddUint32(unpadded_row_size, unpack_alignment - 1, &temp)) {
409      return false;
410  }
411  *padded_row_size = (temp / unpack_alignment) * unpack_alignment;
412  return true;
413}
414
415// Returns the amount of data glTexImage2D or glTexSubImage2D will access.
416bool GLES2Util::ComputeImageDataSizes(
417    int width, int height, int format, int type, int unpack_alignment,
418    uint32* size, uint32* ret_unpadded_row_size, uint32* ret_padded_row_size) {
419  uint32 bytes_per_group = ComputeImageGroupSize(format, type);
420  uint32 row_size;
421  if (!SafeMultiplyUint32(width, bytes_per_group, &row_size)) {
422    return false;
423  }
424  if (height > 1) {
425    uint32 temp;
426    if (!SafeAddUint32(row_size, unpack_alignment - 1, &temp)) {
427      return false;
428    }
429    uint32 padded_row_size = (temp / unpack_alignment) * unpack_alignment;
430    uint32 size_of_all_but_last_row;
431    if (!SafeMultiplyUint32((height - 1), padded_row_size,
432                            &size_of_all_but_last_row)) {
433      return false;
434    }
435    if (!SafeAddUint32(size_of_all_but_last_row, row_size, size)) {
436      return false;
437    }
438    if (ret_padded_row_size) {
439      *ret_padded_row_size = padded_row_size;
440    }
441  } else {
442    if (!SafeMultiplyUint32(height, row_size, size)) {
443      return false;
444    }
445    if (ret_padded_row_size) {
446      *ret_padded_row_size = row_size;
447    }
448  }
449  if (ret_unpadded_row_size) {
450    *ret_unpadded_row_size = row_size;
451  }
452
453  return true;
454}
455
456size_t GLES2Util::RenderbufferBytesPerPixel(int format) {
457  switch (format) {
458    case GL_STENCIL_INDEX8:
459      return 1;
460    case GL_RGBA4:
461    case GL_RGB565:
462    case GL_RGB5_A1:
463    case GL_DEPTH_COMPONENT16:
464      return 2;
465    case GL_RGB:
466    case GL_RGBA:
467    case GL_DEPTH24_STENCIL8_OES:
468    case GL_RGB8_OES:
469    case GL_RGBA8_OES:
470    case GL_DEPTH_COMPONENT24_OES:
471      return 4;
472    default:
473      return 0;
474  }
475}
476
477uint32 GLES2Util::GetGLDataTypeSizeForUniforms(int type) {
478  switch (type) {
479    case GL_FLOAT:
480      return sizeof(GLfloat);              // NOLINT
481    case GL_FLOAT_VEC2:
482      return sizeof(GLfloat) * 2;          // NOLINT
483    case GL_FLOAT_VEC3:
484      return sizeof(GLfloat) * 3;          // NOLINT
485    case GL_FLOAT_VEC4:
486      return sizeof(GLfloat) * 4;          // NOLINT
487    case GL_INT:
488      return sizeof(GLint);                // NOLINT
489    case GL_INT_VEC2:
490      return sizeof(GLint) * 2;            // NOLINT
491    case GL_INT_VEC3:
492      return sizeof(GLint) * 3;            // NOLINT
493    case GL_INT_VEC4:
494      return sizeof(GLint) * 4;            // NOLINT
495    case GL_BOOL:
496      return sizeof(GLint);                // NOLINT
497    case GL_BOOL_VEC2:
498      return sizeof(GLint) * 2;            // NOLINT
499    case GL_BOOL_VEC3:
500      return sizeof(GLint) * 3;            // NOLINT
501    case GL_BOOL_VEC4:
502      return sizeof(GLint) * 4;            // NOLINT
503    case GL_FLOAT_MAT2:
504      return sizeof(GLfloat) * 2 * 2;      // NOLINT
505    case GL_FLOAT_MAT3:
506      return sizeof(GLfloat) * 3 * 3;      // NOLINT
507    case GL_FLOAT_MAT4:
508      return sizeof(GLfloat) * 4 * 4;      // NOLINT
509    case GL_SAMPLER_2D:
510      return sizeof(GLint);                // NOLINT
511    case GL_SAMPLER_2D_RECT_ARB:
512      return sizeof(GLint);                // NOLINT
513    case GL_SAMPLER_CUBE:
514      return sizeof(GLint);                // NOLINT
515    case GL_SAMPLER_EXTERNAL_OES:
516      return sizeof(GLint);                // NOLINT
517    default:
518      return 0;
519  }
520}
521
522size_t GLES2Util::GetGLTypeSizeForTexturesAndBuffers(uint32 type) {
523  switch (type) {
524    case GL_BYTE:
525      return sizeof(GLbyte);  // NOLINT
526    case GL_UNSIGNED_BYTE:
527      return sizeof(GLubyte);  // NOLINT
528    case GL_SHORT:
529      return sizeof(GLshort);  // NOLINT
530    case GL_UNSIGNED_SHORT:
531      return sizeof(GLushort);  // NOLINT
532    case GL_INT:
533      return sizeof(GLint);  // NOLINT
534    case GL_UNSIGNED_INT:
535      return sizeof(GLuint);  // NOLINT
536    case GL_FLOAT:
537      return sizeof(GLfloat);  // NOLINT
538    case GL_FIXED:
539      return sizeof(GLfixed);  // NOLINT
540    default:
541      return 0;
542  }
543}
544
545uint32 GLES2Util::GLErrorToErrorBit(uint32 error) {
546  switch (error) {
547    case GL_INVALID_ENUM:
548      return gl_error_bit::kInvalidEnum;
549    case GL_INVALID_VALUE:
550      return gl_error_bit::kInvalidValue;
551    case GL_INVALID_OPERATION:
552      return gl_error_bit::kInvalidOperation;
553    case GL_OUT_OF_MEMORY:
554      return gl_error_bit::kOutOfMemory;
555    case GL_INVALID_FRAMEBUFFER_OPERATION:
556      return gl_error_bit::kInvalidFrameBufferOperation;
557    default:
558      NOTREACHED();
559      return gl_error_bit::kNoError;
560  }
561}
562
563uint32 GLES2Util::GLErrorBitToGLError(uint32 error_bit) {
564  switch (error_bit) {
565    case gl_error_bit::kInvalidEnum:
566      return GL_INVALID_ENUM;
567    case gl_error_bit::kInvalidValue:
568      return GL_INVALID_VALUE;
569    case gl_error_bit::kInvalidOperation:
570      return GL_INVALID_OPERATION;
571    case gl_error_bit::kOutOfMemory:
572      return GL_OUT_OF_MEMORY;
573    case gl_error_bit::kInvalidFrameBufferOperation:
574      return GL_INVALID_FRAMEBUFFER_OPERATION;
575    default:
576      NOTREACHED();
577      return GL_NO_ERROR;
578  }
579}
580
581uint32 GLES2Util::IndexToGLFaceTarget(int index) {
582  static uint32 faces[] = {
583    GL_TEXTURE_CUBE_MAP_POSITIVE_X,
584    GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
585    GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
586    GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
587    GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
588    GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
589  };
590  return faces[index];
591}
592
593uint32 GLES2Util::GetPreferredGLReadPixelsFormat(uint32 internal_format) {
594  switch (internal_format) {
595    case GL_RGB16F_EXT:
596    case GL_RGB32F_EXT:
597      return GL_RGB;
598    case GL_RGBA16F_EXT:
599    case GL_RGBA32F_EXT:
600      return GL_RGBA;
601    default:
602      return GL_RGBA;
603  }
604}
605
606uint32 GLES2Util::GetPreferredGLReadPixelsType(
607    uint32 internal_format, uint32 texture_type) {
608  switch (internal_format) {
609    case GL_RGBA32F_EXT:
610    case GL_RGB32F_EXT:
611      return GL_FLOAT;
612    case GL_RGBA16F_EXT:
613    case GL_RGB16F_EXT:
614      return GL_HALF_FLOAT_OES;
615    case GL_RGBA:
616    case GL_RGB:
617      // Unsized internal format, check the type
618      switch (texture_type) {
619        case GL_FLOAT:
620        case GL_HALF_FLOAT_OES:
621          return GL_FLOAT;
622        default:
623          return GL_UNSIGNED_BYTE;
624      }
625    default:
626      return GL_UNSIGNED_BYTE;
627  }
628}
629
630uint32 GLES2Util::GetChannelsForFormat(int format) {
631  switch (format) {
632    case GL_ALPHA:
633    case GL_ALPHA16F_EXT:
634    case GL_ALPHA32F_EXT:
635      return kAlpha;
636    case GL_LUMINANCE:
637      return kRGB;
638    case GL_LUMINANCE_ALPHA:
639      return kRGBA;
640    case GL_RGB:
641    case GL_RGB8_OES:
642    case GL_RGB565:
643    case GL_RGB16F_EXT:
644    case GL_RGB32F_EXT:
645      return kRGB;
646    case GL_BGRA_EXT:
647    case GL_BGRA8_EXT:
648    case GL_RGBA16F_EXT:
649    case GL_RGBA32F_EXT:
650    case GL_RGBA:
651    case GL_RGBA8_OES:
652    case GL_RGBA4:
653    case GL_RGB5_A1:
654      return kRGBA;
655    case GL_DEPTH_COMPONENT32_OES:
656    case GL_DEPTH_COMPONENT24_OES:
657    case GL_DEPTH_COMPONENT16:
658    case GL_DEPTH_COMPONENT:
659      return kDepth;
660    case GL_STENCIL_INDEX8:
661      return kStencil;
662    case GL_DEPTH_STENCIL_OES:
663    case GL_DEPTH24_STENCIL8_OES:
664      return kDepth | kStencil;
665    default:
666      return 0x0000;
667  }
668}
669
670uint32 GLES2Util::GetChannelsNeededForAttachmentType(
671    int type, uint32 max_color_attachments) {
672  switch (type) {
673    case GL_DEPTH_ATTACHMENT:
674      return kDepth;
675    case GL_STENCIL_ATTACHMENT:
676      return kStencil;
677    default:
678      if (type >= GL_COLOR_ATTACHMENT0 &&
679          type < static_cast<int>(
680              GL_COLOR_ATTACHMENT0 + max_color_attachments)) {
681        return kRGBA;
682      }
683      return 0x0000;
684  }
685}
686
687std::string GLES2Util::GetStringEnum(uint32 value) {
688  const EnumToString* entry = enum_to_string_table_;
689  const EnumToString* end = entry + enum_to_string_table_len_;
690  for (;entry < end; ++entry) {
691    if (value == entry->value) {
692      return entry->name;
693    }
694  }
695  char buffer[20];
696  sprintf(buffer, (value < 0x10000) ? "0x%04x" : "0x%08x", value);
697  return buffer;
698}
699
700std::string GLES2Util::GetStringError(uint32 value) {
701  static EnumToString string_table[] = {
702    { GL_NONE, "GL_NONE" },
703  };
704  return GLES2Util::GetQualifiedEnumString(
705      string_table, arraysize(string_table), value);
706}
707
708std::string GLES2Util::GetStringBool(uint32 value) {
709  return value ? "GL_TRUE" : "GL_FALSE";
710}
711
712std::string GLES2Util::GetQualifiedEnumString(
713    const EnumToString* table, size_t count, uint32 value) {
714  for (const EnumToString* end = table + count; table < end; ++table) {
715    if (table->value == value) {
716      return table->name;
717    }
718  }
719  return GetStringEnum(value);
720}
721
722bool GLES2Util::ParseUniformName(
723    const std::string& name,
724    size_t* array_pos,
725    int* element_index,
726    bool* getting_array) {
727  bool getting_array_location = false;
728  size_t open_pos = std::string::npos;
729  int index = 0;
730  if (name[name.size() - 1] == ']') {
731    if (name.size() < 3) {
732      return false;
733    }
734    open_pos = name.find_last_of('[');
735    if (open_pos == std::string::npos ||
736        open_pos >= name.size() - 2) {
737      return false;
738    }
739    size_t last = name.size() - 1;
740    for (size_t pos = open_pos + 1; pos < last; ++pos) {
741      int8 digit = name[pos] - '0';
742      if (digit < 0 || digit > 9) {
743        return false;
744      }
745      index = index * 10 + digit;
746    }
747    getting_array_location = true;
748  }
749  *getting_array = getting_array_location;
750  *element_index = index;
751  *array_pos = open_pos;
752  return true;
753}
754
755namespace {
756
757// From <EGL/egl.h>.
758const int32 kAlphaSize       = 0x3021;  // EGL_ALPHA_SIZE
759const int32 kBlueSize        = 0x3022;  // EGL_BLUE_SIZE
760const int32 kGreenSize       = 0x3023;  // EGL_GREEN_SIZE
761const int32 kRedSize         = 0x3024;  // EGL_RED_SIZE
762const int32 kDepthSize       = 0x3025;  // EGL_DEPTH_SIZE
763const int32 kStencilSize     = 0x3026;  // EGL_STENCIL_SIZE
764const int32 kSamples         = 0x3031;  // EGL_SAMPLES
765const int32 kSampleBuffers   = 0x3032;  // EGL_SAMPLE_BUFFERS
766const int32 kNone            = 0x3038;  // EGL_NONE
767const int32 kSwapBehavior    = 0x3093;  // EGL_SWAP_BEHAVIOR
768const int32 kBufferPreserved = 0x3094;  // EGL_BUFFER_PRESERVED
769const int32 kBufferDestroyed = 0x3095;  // EGL_BUFFER_DESTROYED
770
771// Chromium only.
772const int32 kShareResources        = 0x10000;
773const int32 kBindGeneratesResource = 0x10001;
774const int32 kFailIfMajorPerfCaveat = 0x10002;
775
776}  // namespace
777
778ContextCreationAttribHelper::ContextCreationAttribHelper()
779  : alpha_size_(-1),
780    blue_size_(-1),
781    green_size_(-1),
782    red_size_(-1),
783    depth_size_(-1),
784    stencil_size_(-1),
785    samples_(-1),
786    sample_buffers_(-1),
787    buffer_preserved_(true),
788    share_resources_(false),
789    bind_generates_resource_(true),
790    fail_if_major_perf_caveat_(false) {
791}
792
793void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) {
794  if (alpha_size_ != -1) {
795    attribs->push_back(kAlphaSize);
796    attribs->push_back(alpha_size_);
797  }
798  if (blue_size_ != -1) {
799    attribs->push_back(kBlueSize);
800    attribs->push_back(blue_size_);
801  }
802  if (green_size_ != -1) {
803    attribs->push_back(kGreenSize);
804    attribs->push_back(green_size_);
805  }
806  if (red_size_ != -1) {
807    attribs->push_back(kRedSize);
808    attribs->push_back(red_size_);
809  }
810  if (depth_size_ != -1) {
811    attribs->push_back(kDepthSize);
812    attribs->push_back(depth_size_);
813  }
814  if (stencil_size_ != -1) {
815    attribs->push_back(kStencilSize);
816    attribs->push_back(stencil_size_);
817  }
818  if (samples_ != -1) {
819    attribs->push_back(kSamples);
820    attribs->push_back(samples_);
821  }
822  if (sample_buffers_ != -1) {
823    attribs->push_back(kSampleBuffers);
824    attribs->push_back(sample_buffers_);
825  }
826  attribs->push_back(kSwapBehavior);
827  attribs->push_back(buffer_preserved_ ? kBufferPreserved : kBufferDestroyed);
828  attribs->push_back(kShareResources);
829  attribs->push_back(share_resources_ ? 1 : 0);
830  attribs->push_back(kBindGeneratesResource);
831  attribs->push_back(bind_generates_resource_ ? 1 : 0);
832  attribs->push_back(kFailIfMajorPerfCaveat);
833  attribs->push_back(fail_if_major_perf_caveat_ ? 1 : 0);
834  attribs->push_back(kNone);
835}
836
837bool ContextCreationAttribHelper::Parse(const std::vector<int32>& attribs) {
838  for (size_t i = 0; i < attribs.size(); i += 2) {
839    const int32 attrib = attribs[i];
840    if (i + 1 >= attribs.size()) {
841      if (attrib == kNone) {
842        return true;
843      }
844
845      DLOG(ERROR) << "Missing value after context creation attribute: "
846                  << attrib;
847      return false;
848    }
849
850    const int32 value = attribs[i+1];
851    switch (attrib) {
852      case kAlphaSize:
853        alpha_size_ = value;
854        break;
855      case kBlueSize:
856        blue_size_ = value;
857        break;
858      case kGreenSize:
859        green_size_ = value;
860        break;
861      case kRedSize:
862        red_size_ = value;
863        break;
864      case kDepthSize:
865        depth_size_ = value;
866        break;
867      case kStencilSize:
868        stencil_size_ = value;
869        break;
870      case kSamples:
871        samples_ = value;
872        break;
873      case kSampleBuffers:
874        sample_buffers_ = value;
875        break;
876      case kSwapBehavior:
877        buffer_preserved_ = value == kBufferPreserved;
878        break;
879      case kShareResources:
880        share_resources_ = value != 0;
881        break;
882      case kBindGeneratesResource:
883        bind_generates_resource_ = value != 0;
884        break;
885      case kFailIfMajorPerfCaveat:
886        fail_if_major_perf_caveat_ = value != 0;
887        break;
888      case kNone:
889        // Terminate list, even if more attributes.
890        return true;
891      default:
892        DLOG(ERROR) << "Invalid context creation attribute: " << attrib;
893        return false;
894    }
895  }
896
897  return true;
898}
899
900#include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
901
902}  // namespace gles2
903}  // namespace gpu
904
905