/**

 * ShaderShark

 * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * 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, version 3 of the License.

 *

 * 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/>.

 */

#include <string>

#include <exception>

#include "Program.h"

class Program::Impl {

public:

	GLuint id;

};

Program::Program() : impl(new Impl()) {

	impl->id = glCreateProgram();

}

Program::~Program() {

	glDeleteProgram(impl->id);

	delete impl;

}

void Program::attachShader(const Shader& shader) {

	glAttachShader(impl->id, shader.getId());

}

void Program::detachShader(const Shader& shader) {

	glDetachShader(impl->id, shader.getId());

}

void Program::link() {

	glLinkProgram(impl->id);

	GLint linkStatus;

	glGetProgramiv(impl->id, GL_LINK_STATUS, &linkStatus);

	if (linkStatus != GL_TRUE) {

		char error[512];

		glGetProgramInfoLog(impl->id, sizeof (error), NULL, error);

		throw std::logic_error(

				std::string("GLSL: program failed to link: ") + error);

	}

}

void Program::use() {

	glUseProgram(impl->id);

	checkError();

}

GLint Program::getAttribLocation(const std::string& name) {

	return glGetAttribLocation(impl->id, name.c_str());

}

GLint Program::getUniformLocation(const std::string& name) {

	return glGetUniformLocation(impl->id, name.c_str());

}

GLint Program::getFragDataLocation(const std::string& name) {

	return glGetFragDataLocation(impl->id, name.c_str());

}

void Program::bindFragDataLocation(const std::string& name, const GLint color) {

	glBindFragDataLocation(impl->id, color, name.c_str());

}