/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena 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 2 of the License,
or (at your option) any later version.

Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#ifdef USE_LOCAL_HEADERS
#	include "SDL.h"
#else
#	include <SDL.h>
#endif

#include "../renderer/tr_local.h"
#include "../qcommon/qcommon.h"

/*
=================
GLimp_SetGamma
=================
*/
void GLimp_SetGamma(unsigned char red[256], unsigned char green[256], unsigned char blue[256])
{
	Uint16          table[3][256];
	int             i, j;

	if(!glConfig.deviceSupportsGamma || r_ignorehwgamma->integer)
		return;

	for(i = 0; i < 256; i++)
	{
		table[0][i] = (((Uint16) red[i]) << 8) | red[i];
		table[1][i] = (((Uint16) green[i]) << 8) | green[i];
		table[2][i] = (((Uint16) blue[i]) << 8) | blue[i];
	}

#if 0 //def _WIN32
#include <windows.h>

	// Win2K and newer put this odd restriction on gamma ramps...
	{
		OSVERSIONINFO   vinfo;

		vinfo.dwOSVersionInfoSize = sizeof(vinfo);
		GetVersionEx(&vinfo);
		if(vinfo.dwMajorVersion >= 5 && vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT)
		{
			ri.Printf(PRINT_DEVELOPER, "performing gamma clamp.\n");
			for(j = 0; j < 3; j++)
			{
				for(i = 0; i < 128; i++)
				{
					if(table[j][i] > ((128 + i) << 8))
						table[j][i] = (128 + i) << 8;
				}

				if(table[j][127] > 254 << 8)
					table[j][127] = 254 << 8;
			}
		}
	}
#endif

	// enforce constantly increasing
	for(j = 0; j < 3; j++)
	{
		for(i = 1; i < 256; i++)
		{
			if(table[j][i] < table[j][i - 1])
				table[j][i] = table[j][i - 1];
		}
	}

	SDL_SetGammaRamp(table[0], table[1], table[2]);
}