/**
 * 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/>.
 */

#pragma once

#include <string>
#include <stdexcept>

#include <epoxy/gl.h>
#include <epoxy/glx.h>
#include <GL/glu.h>

#include <glm/glm.hpp>
#include <glm/ext.hpp>

inline
void quads(GLfloat tx, GLfloat ty, GLfloat x, GLfloat y, GLfloat z) {
	glTexCoord2f(tx, ty);
	glVertex3f(x, y, z);
}

inline
void checkError(std::ostream* out) {
	GLenum code = glGetError();
	if (code == GL_NO_ERROR) {
		if (out) *out << "GL check: OK" << std::endl;
	} else {
		const char* string = (const char*) gluErrorString(code);
		if (out) *out << "GL check: " << string << std::endl;
		else throw std::logic_error(std::string("GL error: ") + string);
	}
}

inline
GLenum toShaderType(const std::string& fileName) {
	if (fileName.ends_with(".vert")) return GL_VERTEX_SHADER;
	else if (fileName.ends_with(".frag")) return GL_FRAGMENT_SHADER;
	else throw std::invalid_argument("Expecting *.vert or *.frag file");
}

inline
void dump(const char* name, const glm::vec3& value) {
	std::cerr << "dump: " << name << " = ["
			<< value.x << ", "
			<< value.y << ", "
			<< value.z << "]" << std::endl;
}