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// external libs
#include "glad/glad.h"
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// project headers
#include "shader.hpp"
// std libs
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
Shader::Shader(const char* vertexPath, const char* fragmentPath)
{
// -- read shaders from file --
std::string vertexCode;
std::string fragmentCode;
std::ifstream vShaderFile;
std::ifstream fShaderFile;
// ensure ifstream objects can throw exceptions:
vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
try
{
// open files
vShaderFile.open(vertexPath);
fShaderFile.open(fragmentPath);
std::stringstream vShaderStream, fShaderStream;
// read file's buffer contents into streams
vShaderStream << vShaderFile.rdbuf();
fShaderStream << fShaderFile.rdbuf();
// close file handlers
vShaderFile.close();
fShaderFile.close();
// convert stream into string
vertexCode = vShaderStream.str();
fragmentCode = fShaderStream.str();
}
catch(std::ifstream::failure e)
{
std::cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ" << std::endl;
}
const char* vShaderCode = vertexCode.c_str();
const char* fShaderCode = fragmentCode.c_str();
// -- compile shaders --
unsigned int vertex, fragment;
int success;
char infoLog[512];
// vertex Shader
vertex = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex, 1, &vShaderCode, NULL);
glCompileShader(vertex);
glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
if(!success)
{
glGetShaderInfoLog(vertex, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
};
// fragment Shader
fragment = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment, 1, &fShaderCode, NULL);
glCompileShader(fragment);
glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
if(!success)
{
glGetShaderInfoLog(fragment, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
};
// linking shaders
this->ID = glCreateProgram();
glAttachShader(ID, vertex);
glAttachShader(ID, fragment);
glLinkProgram(ID);
glGetProgramiv(ID, GL_LINK_STATUS, &success);
if(!success)
{
glGetProgramInfoLog(ID, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
}
// cleanup uneeded pre-linked shaders
glDeleteShader(vertex);
glDeleteShader(fragment);
}
void Shader::use()
{
glUseProgram(ID);
}
// -- various setters for shader uniforms --
void Shader::setBool(const std::string &name, bool value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
void Shader::setInt(const std::string &name, int value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
void Shader::set1f(const std::string &name, float value) const
{
glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}
void Shader::set4f(const std::string &name, float value0, float value1, float value2, float value3) const
{
glUniform4f(glGetUniformLocation(ID, name.c_str()), value0, value1, value2, value3);
}
void Shader::setMatrix4fv(const std::string &name, glm::mat4 matrix)
{
glUniformMatrix4fv(
glGetUniformLocation(ID, name.c_str()),
1,
GL_FALSE,
glm::value_ptr(matrix)
);
}
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