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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "gl_shader_util.h"
#include "common/logging/log.h"
#include <vector>
#include <algorithm>
namespace ShaderUtil {
GLuint LoadShaders(const char* vertex_shader, const char* fragment_shader) {
// Create the shaders
GLuint vertex_shader_id = glCreateShader(GL_VERTEX_SHADER);
GLuint fragment_shader_id = glCreateShader(GL_FRAGMENT_SHADER);
GLint result = GL_FALSE;
int info_log_length;
// Compile Vertex Shader
LOG_DEBUG(Render_OpenGL, "Compiling vertex shader...");
glShaderSource(vertex_shader_id, 1, &vertex_shader, nullptr);
glCompileShader(vertex_shader_id);
// Check Vertex Shader
glGetShaderiv(vertex_shader_id, GL_COMPILE_STATUS, &result);
glGetShaderiv(vertex_shader_id, GL_INFO_LOG_LENGTH, &info_log_length);
if (info_log_length > 1) {
std::vector<char> vertex_shader_error(info_log_length);
glGetShaderInfoLog(vertex_shader_id, info_log_length, nullptr, &vertex_shader_error[0]);
if (result) {
LOG_DEBUG(Render_OpenGL, "%s", &vertex_shader_error[0]);
} else {
LOG_ERROR(Render_OpenGL, "Error compiling vertex shader:\n%s", &vertex_shader_error[0]);
}
}
// Compile Fragment Shader
LOG_DEBUG(Render_OpenGL, "Compiling fragment shader...");
glShaderSource(fragment_shader_id, 1, &fragment_shader, nullptr);
glCompileShader(fragment_shader_id);
// Check Fragment Shader
glGetShaderiv(fragment_shader_id, GL_COMPILE_STATUS, &result);
glGetShaderiv(fragment_shader_id, GL_INFO_LOG_LENGTH, &info_log_length);
if (info_log_length > 1) {
std::vector<char> fragment_shader_error(info_log_length);
glGetShaderInfoLog(fragment_shader_id, info_log_length, nullptr, &fragment_shader_error[0]);
if (result) {
LOG_DEBUG(Render_OpenGL, "%s", &fragment_shader_error[0]);
} else {
LOG_ERROR(Render_OpenGL, "Error compiling fragment shader:\n%s", &fragment_shader_error[0]);
}
}
// Link the program
LOG_DEBUG(Render_OpenGL, "Linking program...");
GLuint program_id = glCreateProgram();
glAttachShader(program_id, vertex_shader_id);
glAttachShader(program_id, fragment_shader_id);
glLinkProgram(program_id);
// Check the program
glGetProgramiv(program_id, GL_LINK_STATUS, &result);
glGetProgramiv(program_id, GL_INFO_LOG_LENGTH, &info_log_length);
if (info_log_length > 1) {
std::vector<char> program_error(info_log_length);
glGetProgramInfoLog(program_id, info_log_length, nullptr, &program_error[0]);
if (result) {
LOG_DEBUG(Render_OpenGL, "%s", &program_error[0]);
} else {
LOG_ERROR(Render_OpenGL, "Error linking shader:\n%s", &program_error[0]);
}
}
glDeleteShader(vertex_shader_id);
glDeleteShader(fragment_shader_id);
return program_id;
}
}
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