/**

 * 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 <stdexcept>

#include "Shader.h"

class Shader::Impl {

public:

	Shader::Type type;

	GLuint id;

	std::string fileName;

};

Shader::Shader(

		const Type type,

		const Buffer& source,

		const std::string& fileName) : impl(new Impl()) {

	impl->type = type;

	impl->fileName = fileName;

	impl->id = glCreateShader((GLenum) impl->type);

	update(source);

}

Shader::~Shader() {

	glDeleteShader(impl->id);

	delete impl;

}

GLuint Shader::getId() const {

	return impl->id;

}

const std::string Shader::getFileName() const {

	return impl->fileName;

}

void Shader::update(const Buffer& source) {

	auto fileData = source.getData();

	GLint fileSize = source.getSize();

	glShaderSource(impl->id, 1, &fileData, &fileSize);

	glCompileShader(impl->id);

	GLint compileStatus;

	glGetShaderiv(impl->id, GL_COMPILE_STATUS, &compileStatus);

	if (compileStatus != GL_TRUE) {

		char error[512];

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

		throw std::logic_error(

				std::string("GLSL: shader failed to compile: ") + error);

	}

}