Introduce GLStubApi

ui/gl/gl_stub_api.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gl/gl_stub_api.h"
+
+namespace gl {
+
+namespace {
+
+void GenHelper(GLsizei count, GLuint* objects) {
+  for (GLsizei i = 0; i < count; ++i)
+    objects[i] = i + 1;
+}
+
+}  // anonymous namespace
+
+GLenum GLStubApi::glCheckFramebufferStatusEXTFn(GLenum target) {
+  return GL_FRAMEBUFFER_COMPLETE;
+}
+
+GLuint GLStubApi::glCreateProgramFn(void) {
+  return 1;
+}
+
+GLuint GLStubApi::glCreateShaderFn(GLenum type) {
+  return 2;
+}
+
+GLsync GLStubApi::glFenceSyncFn(GLenum condition, GLbitfield flags) {
+  return reinterpret_cast<GLsync>(1);
+}
+
+void GLStubApi::glGenBuffersARBFn(GLsizei n, GLuint* buffers) {
+  GenHelper(n, buffers);
+}
+
+void GLStubApi::glGenerateMipmapEXTFn(GLenum target) {}
+
+void GLStubApi::glGenFencesAPPLEFn(GLsizei n, GLuint* fences) {
+  GenHelper(n, fences);
+}
+
+void GLStubApi::glGenFencesNVFn(GLsizei n, GLuint* fences) {
+  GenHelper(n, fences);
+}
+
+void GLStubApi::glGenFramebuffersEXTFn(GLsizei n, GLuint* framebuffers) {
+  GenHelper(n, framebuffers);
+}
+
+GLuint GLStubApi::glGenPathsNVFn(GLsizei range) {
+  return 1;
+}
+
+void GLStubApi::glGenQueriesFn(GLsizei n, GLuint* ids) {
+  GenHelper(n, ids);
+}
+
+void GLStubApi::glGenRenderbuffersEXTFn(GLsizei n, GLuint* renderbuffers) {
+  GenHelper(n, renderbuffers);
+}
+
+void GLStubApi::glGenSamplersFn(GLsizei n, GLuint* samplers) {
+  GenHelper(n, samplers);
+}
+
+void GLStubApi::glGenTexturesFn(GLsizei n, GLuint* textures) {
+  GenHelper(n, textures);
+}
+
+void GLStubApi::glGenTransformFeedbacksFn(GLsizei n, GLuint* ids) {
+  GenHelper(n, ids);
+}
+
+void GLStubApi::glGenVertexArraysOESFn(GLsizei n, GLuint* arrays) {
+  GenHelper(n, arrays);
+}
+
+void GLStubApi::glGetIntegervFn(GLenum pname, GLint* params) {
+  // We need some values to be large enough to initialize ContextGroup.
+  switch (pname) {
+    default:
+      *params = 1;
+      break;
+    case GL_MAX_RENDERBUFFER_SIZE:
+      *params = 512;
+      break;
+    case GL_MAX_SAMPLES:
+      *params = 4;
+      break;
+    case GL_MAX_COLOR_ATTACHMENTS_EXT:
+      *params = 4;
+      break;
+    case GL_MAX_DRAW_BUFFERS_ARB:
+      *params = 4;
+      break;
+    case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
+      *params = 4;
+      break;
+    case GL_MAX_UNIFORM_BUFFER_BINDINGS:
+      *params = 24;
+      break;
+    case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
+      *params = 256;
+      break;
+    case GL_MAX_VERTEX_ATTRIBS:
+      *params = 8;
+      break;
+    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
+      *params = 8;
+      break;
+    case GL_MAX_TEXTURE_IMAGE_UNITS:
+      *params = 8;
+      break;
+    case GL_MAX_TEXTURE_SIZE:
+      *params = 2048;
+      break;
+    case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
+      *params = 2048;
+      break;
+    case GL_MAX_3D_TEXTURE_SIZE:
+      *params = 256;
+      break;
+    case GL_MAX_ARRAY_TEXTURE_LAYERS:
+      *params = 256;
+      break;
+    case GL_MAX_VARYING_VECTORS:
+      *params = 8;
+      break;
+    case GL_MAX_VERTEX_UNIFORM_VECTORS:
+      *params = 128;
+      break;
+    case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
+      *params = 16;
+      break;
+    case GL_MAX_VERTEX_OUTPUT_COMPONENTS:
+      *params = 64;
+      break;
+    case GL_MAX_FRAGMENT_INPUT_COMPONENTS:
+      *params = 60;
+      break;
+    case GL_MAX_PROGRAM_TEXEL_OFFSET:
+      *params = 7;
+      break;
+    case GL_MIN_PROGRAM_TEXEL_OFFSET:
+      *params = -8;
+      break;
+    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
+      *params = 32;
+      break;
+    case GL_MAX_VIEWPORT_DIMS:
+      *params = 1024 << 8;
+      break;
+    case GL_ALPHA_BITS:
+      *params = 8;
+      break;
+    case GL_DEPTH_BITS:
+      *params = 24;
+      break;
+    case GL_STENCIL_BITS:
+      *params = 8;
+      break;
+    case GL_TEXTURE_BINDING_2D:
+      *params = 1;
+      break;
+    case GL_FRAMEBUFFER_BINDING:
+      *params = 1;
+      break;
+    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
+      *params = GL_UNSIGNED_BYTE;
+      break;
+    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
+      *params = GL_RGBA;
+      break;
+  }
+}
+
+void GLStubApi::glGetProgramivFn(GLuint program, GLenum pname, GLint* params) {
+  switch (pname) {
+    case GL_LINK_STATUS:
+      *params = GL_TRUE;
+      break;
+    case GL_VALIDATE_STATUS:
+      *params = GL_TRUE;
+      break;
+    default:
+      break;
+  }
+}
+
+void GLStubApi::glGetShaderivFn(GLuint shader, GLenum pname, GLint* params) {
+  switch (pname) {
+    case GL_COMPILE_STATUS:
+      *params = GL_TRUE;
+      break;
+    default:
+      break;
+  }
+}
+
+const GLubyte* GLStubApi::glGetStringFn(GLenum name) {
+  switch (name) {
+    case GL_RENDERER:
+    default:
+      return reinterpret_cast<const GLubyte*>("");
+    case GL_VERSION:
+      return reinterpret_cast<const GLubyte*>("OpenGL ES 3.0");
+    case GL_EXTENSIONS:
+      return reinterpret_cast<const GLubyte*>("GL_EXT_framebuffer_object");
+  }
+}
+
+const GLubyte* GLStubApi::glGetStringiFn(GLenum name, GLuint index) {
+  return reinterpret_cast<const GLubyte*>("");
+}
+
+GLboolean GLStubApi::glIsBufferFn(GLuint buffer) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsEnabledFn(GLenum cap) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsFenceAPPLEFn(GLuint fence) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsFenceNVFn(GLuint fence) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsFramebufferEXTFn(GLuint framebuffer) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsPathNVFn(GLuint path) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsProgramFn(GLuint program) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsQueryFn(GLuint query) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsRenderbufferEXTFn(GLuint renderbuffer) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsSamplerFn(GLuint sampler) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsShaderFn(GLuint shader) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsSyncFn(GLsync sync) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsTextureFn(GLuint texture) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsTransformFeedbackFn(GLuint id) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glIsVertexArrayOESFn(GLuint array) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glTestFenceAPPLEFn(GLuint fence) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glTestFenceNVFn(GLuint fence) {
+  return GL_TRUE;
+}
+
+GLboolean GLStubApi::glUnmapBufferFn(GLenum target) {
+  return GL_TRUE;
+}
+
+GLenum GLStubApi::glWaitSyncFn(GLsync sync,
+                               GLbitfield flags,
+                               GLuint64 timeout) {
+  return GL_TRUE;
+}
+
+}  // namespace gl