shader.h

#pragma once
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>

#include <GL/glew.h>
#include <glm/glm.hpp>

class Shader {
	GLuint vertex, fragment;
public:
	GLuint Program;
	Shader(const char* vertexPath, const char* fragmentPath)
	{
		std::string vertexCode;
		std::string fragmentCode;
		std::ifstream vShaderFile;
		std::ifstream fShaderFile;
		vShaderFile.exceptions(std::ifstream::badbit);
		fShaderFile.exceptions(std::ifstream::badbit);

		try {
			vShaderFile.open(vertexPath);
			fShaderFile.open(fragmentPath);

			std::stringstream vShaderStream, fShaderStream;

			vShaderStream << vShaderFile.rdbuf();
			fShaderStream << fShaderFile.rdbuf();

			vShaderFile.close();
			fShaderFile.close();
			vertexCode = vShaderStream.str();
			fragmentCode = fShaderStream.str();
		}
		catch (std::ifstream::failure e) {
			std::cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ" << std::endl;
		}
		const GLchar *vShaderCode = vertexCode.c_str();
		const GLchar *fShaderCode = fragmentCode.c_str();

		//import and compile the shader
		GLuint vertex = glCreateShader(GL_VERTEX_SHADER);
		glShaderSource(vertex, 1, &vShaderCode, NULL);
		glCompileShader(vertex);

		GLint success;
		GLchar infoLog[512];
		glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
		if (!success) {
			glGetShaderInfoLog(vertex, 512, NULL, infoLog);
			std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
		}

		GLuint 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;
		}


		//create the program and linkthe program
		this->Program = glCreateProgram();
		glAttachShader(this->Program, vertex);
		glAttachShader(this->Program, fragment);
		glLinkProgram(this->Program);

		glValidateProgram(this->Program);
		glGetProgramiv(this->Program, GL_LINK_STATUS, &success);
		if (!success) {
			glGetProgramInfoLog(this->Program, 512, NULL, infoLog);
			std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
		}
	}
	~Shader()
	{
		glDetachShader(this->Program, vertex);
		glDetachShader(this->Program, fragment);
		glDeleteShader(vertex);
		glDeleteShader(fragment);
		glDeleteProgram(this->Program);
	}
	void Use()
	{
		glUseProgram(this->Program);
	}
	// utility uniform functions
	// ------------------------------------------------------------------------
	void setBool(const std::string &name, bool value) const
	{
		glUniform1i(glGetUniformLocation(this->Program, name.c_str()), (int)value);
	}
	// ------------------------------------------------------------------------
	void setInt(const std::string &name, int value) const
	{
		glUniform1i(glGetUniformLocation(this->Program, name.c_str()), value);
	}
	// ------------------------------------------------------------------------
	void setFloat(const std::string &name, float value) const
	{
		glUniform1f(glGetUniformLocation(this->Program, name.c_str()), value);
	}
	// ------------------------------------------------------------------------
	void setVec2(const std::string &name, const glm::vec2 &value) const
	{
		glUniform2fv(glGetUniformLocation(this->Program, name.c_str()), 1, &value[0]);
	}
	void setVec2(const std::string &name, float x, float y) const
	{
		glUniform2f(glGetUniformLocation(this->Program, name.c_str()), x, y);
	}
	// ------------------------------------------------------------------------
	void setVec3(const std::string &name, const glm::vec3 &value) const
	{
		glUniform3fv(glGetUniformLocation(this->Program, name.c_str()), 1, &value[0]);
	}
	void setVec3(const std::string &name, float x, float y, float z) const
	{
		glUniform3f(glGetUniformLocation(this->Program, name.c_str()), x, y, z);
	}
	// ------------------------------------------------------------------------
	void setVec4(const std::string &name, const glm::vec4 &value) const
	{
		glUniform4fv(glGetUniformLocation(this->Program, name.c_str()), 1, &value[0]);
	}
	void setVec4(const std::string &name, float x, float y, float z, float w) const
	{
		glUniform4f(glGetUniformLocation(this->Program, name.c_str()), x, y, z, w);
	}
	// ------------------------------------------------------------------------
	void setMat2(const std::string &name, const glm::mat2 &mat) const
	{
		glUniformMatrix2fv(glGetUniformLocation(this->Program, name.c_str()), 1, GL_FALSE, &mat[0][0]);
	}
	// ------------------------------------------------------------------------
	void setMat3(const std::string &name, const glm::mat3 &mat) const
	{
		glUniformMatrix3fv(glGetUniformLocation(this->Program, name.c_str()), 1, GL_FALSE, &mat[0][0]);
	}
	// ------------------------------------------------------------------------
	void setMat4(const std::string &name, const glm::mat4 &mat) const
	{
		glUniformMatrix4fv(glGetUniformLocation(this->Program, name.c_str()), 1, GL_FALSE, &mat[0][0]);
	}
};