Shader.h

#ifndef SHADER_H
#define SHADER_H
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <glad/glad.h>

class Shader
{
public:
	GLuint Program;
	//Constructor generates the shader on the fly
	Shader( const GLchar *vertexPath, const GLchar *fragmentPath)
	{
		// 1. Retrieve the vertex/fragment source code from filePath
		std::string vertexCode;
		std::string fragmentCode;
		std::ifstream vShaderFile;
		std::ifstream fShaderFile;
		// ensures ifstream objects can throw exceptions:
		vShaderFile.exceptions ( std::ifstream::badbit );
		fShaderFile.exceptions ( 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_SUCCESFULLY_READ" << std::endl;
		}
		const GLchar *vShaderCode = vertexCode.c_str( );
		const GLchar *fShaderCode = fragmentCode.c_str( );
		// 2. Compile shaders
		GLuint vertex, fragment;
		GLint success;
		GLchar infoLog[512];
		// Vertex Shader
		vertex = glCreateShader( GL_VERTEX_SHADER );
		glShaderSource( vertex, 1, &vShaderCode, NULL );
		glCompileShader( vertex );
		// Print compile errors if any
		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 );
		// Print compile errors if any
		glGetShaderiv( fragment, GL_COMPILE_STATUS, &success );
		if ( !success )
		{
				glGetShaderInfoLog( fragment, 512, NULL, infoLog );
				std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
		}
		// Shader Program
		this->Program = glCreateProgram( );
		glAttachShader( this->Program, vertex );
		glAttachShader( this->Program, fragment );
		glLinkProgram( this->Program );
		// Print linking errors if any
		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;
		}
		// Delete the shaders as they're linked into our program now and no longer necessery
		glDeleteShader( vertex );
		glDeleteShader( fragment );
	}
	// Uses the current shader
	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) 
	{ 
	    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]);
	}
};

#endif