| // Copyright (c) 2011 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 "base/logging.h" |
| #include "media/tools/shader_bench/gpu_painter.h" |
| |
| // Vertices for a full screen quad. |
| static const float kVertices[8] = { |
| -1.f, 1.f, |
| -1.f, -1.f, |
| 1.f, 1.f, |
| 1.f, -1.f, |
| }; |
| |
| // Texture Coordinates mapping the entire texture. |
| static const float kTextureCoords[8] = { |
| 0, 0, |
| 0, 1, |
| 1, 0, |
| 1, 1, |
| }; |
| |
| // Buffer size for compile errors. |
| static const unsigned int kErrorSize = 4096; |
| |
| GPUPainter::GPUPainter() |
| : surface_(NULL), |
| context_(NULL) { |
| } |
| |
| GPUPainter::~GPUPainter() { |
| } |
| |
| void GPUPainter::SetGLContext(gfx::GLSurface* surface, |
| gfx::GLContext* context) { |
| surface_ = surface; |
| context_ = context; |
| } |
| |
| GLuint GPUPainter::LoadShader(unsigned type, const char* shader_source) { |
| GLuint shader = glCreateShader(type); |
| glShaderSource(shader, 1, &shader_source, NULL); |
| glCompileShader(shader); |
| int result = GL_FALSE; |
| glGetShaderiv(shader, GL_COMPILE_STATUS, &result); |
| if (!result) { |
| char log[kErrorSize]; |
| int len; |
| glGetShaderInfoLog(shader, kErrorSize - 1, &len, log); |
| log[kErrorSize - 1] = 0; |
| LOG(FATAL) << "Shader did not compile: " << log; |
| } |
| return shader; |
| } |
| |
| GLuint GPUPainter::CreateShaderProgram(const char* vertex_shader_source, |
| const char* fragment_shader_source) { |
| |
| // Create vertex and pixel shaders. |
| GLuint vertex_shader = LoadShader(GL_VERTEX_SHADER, vertex_shader_source); |
| GLuint fragment_shader = |
| LoadShader(GL_FRAGMENT_SHADER, fragment_shader_source); |
| |
| // Create program and attach shaders. |
| GLuint program = glCreateProgram(); |
| glAttachShader(program, vertex_shader); |
| glAttachShader(program, fragment_shader); |
| glDeleteShader(vertex_shader); |
| glDeleteShader(fragment_shader); |
| glLinkProgram(program); |
| int result = GL_FALSE; |
| glGetProgramiv(program, GL_LINK_STATUS, &result); |
| if (!result) { |
| char log[kErrorSize]; |
| int len; |
| glGetProgramInfoLog(program, kErrorSize - 1, &len, log); |
| log[kErrorSize - 1] = 0; |
| LOG(FATAL) << "Program did not link: " << log; |
| } |
| glUseProgram(program); |
| |
| // Set common vertex parameters. |
| int pos_location = glGetAttribLocation(program, "in_pos"); |
| glEnableVertexAttribArray(pos_location); |
| glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, kVertices); |
| |
| int tc_location = glGetAttribLocation(program, "in_tc"); |
| glEnableVertexAttribArray(tc_location); |
| glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0, kTextureCoords); |
| return program; |
| } |