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// Copyright (c) 2006-2009 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 "gpu/demos/app_framework/gles2_utils.h"
namespace {
static const int kInfoBufferLength = 1024;
} // namespace
namespace gpu_demos {
namespace gles2_utils {
GLuint LoadShader(GLenum type, const char* shader_src) {
GLuint shader = glCreateShader(type);
if (shader == 0) return 0;
// Load the shader source
glShaderSource(shader, 1, &shader_src, NULL);
// Compile the shader
glCompileShader(shader);
// Check the compile status
GLint value;
glGetShaderiv(shader, GL_COMPILE_STATUS, &value);
if (value == 0) {
char buffer[kInfoBufferLength];
GLsizei length;
glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer);
std::string log(buffer, length);
DLOG(ERROR) << "Error compiling shader:" << log;
glDeleteShader(shader);
shader = 0;
}
return shader;
}
GLuint LoadProgram(const char* v_shader_src, const char* f_shader_src) {
GLuint v_shader = LoadShader(GL_VERTEX_SHADER, v_shader_src);
if (v_shader == 0) return 0;
GLuint f_shader = LoadShader(GL_FRAGMENT_SHADER, f_shader_src);
if (f_shader == 0) return 0;
// Create the program object
GLuint program_object = glCreateProgram();
if (program_object == 0) return 0;
// Link the program and check status.
glAttachShader(program_object, v_shader);
glAttachShader(program_object, f_shader);
glLinkProgram(program_object);
GLint linked = 0;
glGetProgramiv(program_object, GL_LINK_STATUS, &linked);
if (linked == 0) {
char buffer[kInfoBufferLength];
GLsizei length;
glGetProgramInfoLog(program_object, sizeof(buffer), &length, buffer);
std::string log(buffer, length);
DLOG(ERROR) << "Error linking program:" << log;
glDeleteProgram(program_object);
program_object = 0;
}
return program_object;
}
} // namespace gles2_utils
} // namespace gpu_demos
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