/*****************************************************************************
The Dark Mod GPL Source Code

This file is part of the The Dark Mod Source Code, originally based
on the Doom 3 GPL Source Code as published in 2011.

The Dark Mod Source Code 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 3 of the License,
or (at your option) any later version. For details, see LICENSE.TXT.

Project: The Dark Mod (http://www.thedarkmod.com/)

******************************************************************************/

// 8x8 Bayer matrix
float BAYER8_MATRIX[64] = float[](
	0, 32, 8, 40, 2, 34, 10, 42,
	48, 16, 56, 24, 50, 18, 58, 26,
	12, 44, 4, 36, 14, 46, 6, 38,
	60, 28, 52, 20, 62, 30, 54, 22,
	3, 35, 11, 43, 1, 33, 9, 41,
	51, 19, 59, 27, 49, 17, 57, 25,
	15, 47, 7, 39, 13, 45, 5, 37,
	63, 31, 55, 23, 61, 29, 53, 21
);

float ditherFractionBayer8() {
	int x = int(gl_FragCoord.x), y = int(gl_FragCoord.y);
	return BAYER8_MATRIX[8 * (x&7) + (y&7)] / 64.0;
}