91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#ifdef USE_LOCAL_HEADERS
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# include "SDL.h"
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#else
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# include <SDL.h>
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#endif
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#include "../renderer/tr_local.h"
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#include "../qcommon/qcommon.h"
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/*
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=================
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GLimp_SetGamma
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=================
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*/
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void GLimp_SetGamma( unsigned char red[256], unsigned char green[256], unsigned char blue[256] )
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{
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Uint16 table[3][256];
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int i, j;
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if( !glConfig.deviceSupportsGamma || r_ignorehwgamma->integer )
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return;
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for (i = 0; i < 256; i++)
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{
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table[0][i] = ( ( ( Uint16 ) red[i] ) << 8 ) | red[i];
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table[1][i] = ( ( ( Uint16 ) green[i] ) << 8 ) | green[i];
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table[2][i] = ( ( ( Uint16 ) blue[i] ) << 8 ) | blue[i];
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}
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#ifdef _WIN32
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#include <windows.h>
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// Win2K and newer put this odd restriction on gamma ramps...
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{
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OSVERSIONINFO vinfo;
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vinfo.dwOSVersionInfoSize = sizeof( vinfo );
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GetVersionEx( &vinfo );
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if( vinfo.dwMajorVersion >= 5 && vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT )
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{
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ri.Printf( PRINT_DEVELOPER, "performing gamma clamp.\n" );
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for( j = 0 ; j < 3 ; j++ )
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{
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for( i = 0 ; i < 128 ; i++ )
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{
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if( table[ j ] [ i] > ( ( 128 + i ) << 8 ) )
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table[ j ][ i ] = ( 128 + i ) << 8;
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}
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if( table[ j ] [127 ] > 254 << 8 )
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table[ j ][ 127 ] = 254 << 8;
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}
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}
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}
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#endif
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// enforce constantly increasing
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for (j = 0; j < 3; j++)
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{
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for (i = 1; i < 256; i++)
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{
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if (table[j][i] < table[j][i-1])
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table[j][i] = table[j][i-1];
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}
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}
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SDL_SetGammaRamp(table[0], table[1], table[2]);
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}
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