/* gltest - small OpenGL tearing test program
 * Copyright (C) 2012-2013 Ralf Jung <post@ralfj.de>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "glutil.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

void die(const char *msg, ...)
{
	va_list ap;
	va_start(ap, msg);
	vfprintf(stderr, msg, ap);
	va_end(ap);
	exit(1);
}

static const char *glErrorToString(GLenum e)
{
#define CASE(name) case name: return #name
	switch (e) {
		CASE(GL_NO_ERROR);
		CASE(GL_INVALID_ENUM);
		CASE(GL_INVALID_VALUE);
		CASE(GL_INVALID_OPERATION);
#ifndef CON_GLES2
		CASE(GL_STACK_OVERFLOW);
		CASE(GL_STACK_UNDERFLOW);
#endif
		CASE(GL_OUT_OF_MEMORY);
		default: return "<unknown>";
	}
#undef CASE
}

void checkGlError(const char *what)
{
	GLenum e = glGetError();
	if (e == GL_NO_ERROR) return;
	die("GL error %d (%s): %s\n", e, glErrorToString(e), what);
}