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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Tremulous.
Tremulous 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.
Tremulous 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 Tremulous; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "SDL.h"
#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];
}
#ifdef _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 )
{
Com_DPrintf( "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]);
}
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