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/** ---------------------------------------------------------------------------
* -*- c++ -*-
* @file: shader.cpp
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
* MIT License, see LICENSE file for more details.
* ----------------------------------------------------------------------------
*/
#include "shader.h"
#include <fstream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
using std::runtime_error;
namespace yage
{
Shader::Shader(const std::string &vertex_path, const std::string &fragment_path)
{
std::string vertex_source, fragment_source;
std::ifstream vertex_file, fragment_file;
vertex_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
fragment_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
try {
vertex_file.open(vertex_path);
fragment_file.open(fragment_path);
std::ostringstream vertex_stream, fragment_stream;
vertex_stream << vertex_file.rdbuf();
fragment_stream << fragment_file.rdbuf();
vertex_file.close();
fragment_file.close();
vertex_source = vertex_stream.str();
fragment_source = fragment_stream.str();
} catch (std::ifstream::failure e) {
throw runtime_error("File could not be opened: " +
std::string(e.what()));
}
const char *vertex_source_c = vertex_source.c_str();
const char *fragment_source_c = fragment_source.c_str();
GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vertex_source_c, NULL);
glCompileShader(vertex_shader);
errorCheck(vertex_shader, "vertex");
GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fragment_source_c, NULL);
glCompileShader(fragment_shader);
errorCheck(fragment_shader, "fragment");
program_id_ = glCreateProgram();
glAttachShader(program_id_, vertex_shader);
glAttachShader(program_id_, fragment_shader);
glLinkProgram(program_id_);
errorCheck(program_id_, "program");
glDetachShader(program_id_, vertex_shader);
glDetachShader(program_id_, fragment_shader);
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
}
Shader::~Shader()
{
/// cleans up all the shaders and the program
if (program_id_ != 0) {
glDeleteProgram(program_id_);
}
}
void Shader::use() const
{
glUseProgram(program_id_);
}
void Shader::setUniform(const std::string &name, int value) const
{
glUniform1i(getUniformLocation(name), static_cast<GLint>(value));
}
void Shader::setUniform(const std::string &name, float value) const
{
glUniform1f(getUniformLocation(name), static_cast<GLfloat>(value));
}
void Shader::setUniform(const std::string &name, const glm::mat4 &matrix) const
{
glUniformMatrix4fv(getUniformLocation(name), 1, GL_FALSE, &(matrix[0][0]));
}
GLint Shader::getUniformLocation(const std::string &uniform_name) const
{
GLuint location = glGetUniformLocation(program_id_, uniform_name.c_str());
if (location == GL_INVALID_INDEX) {
throw std::runtime_error("'" + uniform_name + "' not found");
}
return location;
}
void Shader::errorCheck(GLuint shader, const std::string &shader_type) const
{
int success;
char info_log[1024];
if (shader_type != std::string("program")) {
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(shader, 1024, NULL, info_log);
throw runtime_error(shader_type +
" failed to compile: " + std::string(info_log));
}
} else {
glGetProgramiv(shader, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shader, 1024, NULL, info_log);
throw runtime_error(shader_type +
" failed to link: " + std::string(info_log));
}
}
}
} // namespace yage
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