#ifndef _UTIL_H
#define _UTIL_H 1
+#include <stdio.h>
+#include <stdlib.h>
+
// assumes h in [0, 2pi> or [-pi, pi>
void hsv2rgb(float h, float s, float v, float *r, float *g, float *b);
+#ifdef NDEBUG
+#define check_error()
+#else
+#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at line %d\n", err, __LINE__); exit(1); } }
+#endif
+
#endif // !defined(_UTIL_H)