ShaderProgram.cpp

#include "ShaderProgram.h"

namespace EvoLisa {

	ShaderProgram::ShaderProgram (string verShaderSourcePath, string fragShaderSourcePath) {
		GLint success;
		GLchar infoLog[512];
		CreateShader (GL_VERTEX_SHADER, verShaderSourcePath);
		CreateShader (GL_FRAGMENT_SHADER, fragShaderSourcePath);
		GLint shaderProgram = glCreateProgram ();
		for each (GLuint i in shaderIDs) {
			glAttachShader (shaderProgram, i);
		}
		glLinkProgram (shaderProgram);
		glGetProgramiv (shaderProgram, GL_LINK_STATUS, &success);
		if (!success) {
			glGetProgramInfoLog (shaderProgram, 512, NULL, infoLog);
			std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
		}
		shaderProgramID = shaderProgram;
	}


	ShaderProgram::~ShaderProgram () {

	}

	void ShaderProgram::CreateShader (int T, string filePath) {
		GLchar infoLog[512];
		GLint success;
		GLuint Shader;
		Shader = glCreateShader (T);
		string str = FileReader::ReadShaderSource (filePath);
		const char *shaderSource = str.c_str ();
		glShaderSource (Shader, 1, &shaderSource, NULL);
		glCompileShader (Shader);

		glGetShaderiv (Shader, GL_COMPILE_STATUS, &success);
		if (!success) {
			glGetShaderInfoLog (Shader, 512, NULL, infoLog);
			std::cout << "ERROR::SHADER::COMPILATION_FAILED\n" << infoLog << std::endl;
		}
		shaderIDs.push_back (Shader);
	}

	void ShaderProgram::AttachShader (int T, string filePath) {
		GLint success;
		GLchar infoLog[512];
		CreateShader (T, filePath);
		glDeleteProgram (shaderProgramID);
		GLint shaderProgram = glCreateProgram ();
		for each (GLuint i in shaderIDs) {
			glAttachShader (shaderProgram, i);
		}
		glLinkProgram (shaderProgram);
		glGetProgramiv (shaderProgram, GL_LINK_STATUS, &success);
		if (!success) {
			glGetProgramInfoLog (shaderProgram, 512, NULL, infoLog);
			std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
		}
		shaderProgramID = shaderProgram;
	}
}