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https://github.com/openmoh/openmohaa.git
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90 lines
2.3 KiB
C
90 lines
2.3 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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#if 0 //def _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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