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/**
* @file shader.hpp
*
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SYSTEM_SHADER_HPP_
#define SYSTEM_SHADER_HPP_
#include <string>
#include <unordered_map>
#include <GL/glew.h>
class Shader
{
private:
/**
* Reads the contents of a shader file and returns a c++ string
* object representing the contents
* @param The file path
* @return The shader contents
*/
std::string readShader(std::string);
/**
* Creates a shader from a filename and a shader type
* @param The file path containing the shader data
* @param What type of shader to create
* @return Memory address of shader location
*/
GLuint createShader(std::string, GLenum);
GLuint program; /**< GPU Memory address of shader program */
/**
* Name of shader attributes and their corresponding memory
* locations in which the data exists
*/
std::unordered_map<std::string, GLuint> attributes;
/**
* Name of shader uniforms in and their corresponding memory
* locations in which the data exists
*/
std::unordered_map<std::string, GLuint> uniforms;
public:
Shader(void) :
program(-1) {}
/**
* Given the file paths of two shaders, create a shader program.
* @param v The file path of the vertex shader file.
* @param f The file path of the fragment shader file.
* @return The GPU Memory location of the shader program
*/
GLuint createProgram(std::string v, std::string f);
/**
* Finds and binds an attribute to the current shader if possible
* @param The attribute to bind in the shader
* @return The memory address of the new attribute, or -1 if the
* attribute doesn't exist in the shader
*/
GLint addAttribute(std::string);
/**
* Finds and binds a uniform to the current shader if possible
* @param The uniform to bind in the shader
* @return The memory address of the new uniform, or -1 if the
* uniform doesn't exist in the shader
*/
GLint addUniform(std::string);
/**
* Finds the GPU memory address of the given attribute in the shader
* program
* @param The attribute to find
* @return The attribute memory location, or -1 if it doesn't exist
*/
GLint getAttribute(std::string);
/**
* Finds the GPU memory address of the given uniform in the shader
* program
* @param The uniform to find
* @return The uniform memory location, or -1 if it doesn't exist
*/
GLint getUniform(std::string);
/**
* Gets the memory address of the program stored in this object
* @return The GPU memory address of the shader program stored
*/
GLuint getProgram();
};
#endif // SYSTEM_SHADER_HPP_
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