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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2006 Tim Angus
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
===========================================================================
*/
/*
** WIN_GAMMA.C
*/
#include <assert.h>
#include "../renderer/tr_local.h"
#include "../qcommon/qcommon.h"
#include "glw_win.h"
#include "win_local.h"
static unsigned short s_oldHardwareGamma[3][256];
/*
** WG_CheckHardwareGamma
**
** Determines if the underlying hardware supports the Win32 gamma correction API.
*/
void WG_CheckHardwareGamma( void )
{
HDC hDC;
glConfig.deviceSupportsGamma = qfalse;
if ( qwglSetDeviceGammaRamp3DFX )
{
glConfig.deviceSupportsGamma = qtrue;
hDC = GetDC( GetDesktopWindow() );
glConfig.deviceSupportsGamma = qwglGetDeviceGammaRamp3DFX( hDC, s_oldHardwareGamma );
ReleaseDC( GetDesktopWindow(), hDC );
return;
}
// non-3Dfx standalone drivers don't support gamma changes, period
if ( glConfig.driverType == GLDRV_STANDALONE )
{
return;
}
if ( !r_ignorehwgamma->integer )
{
hDC = GetDC( GetDesktopWindow() );
glConfig.deviceSupportsGamma = GetDeviceGammaRamp( hDC, s_oldHardwareGamma );
ReleaseDC( GetDesktopWindow(), hDC );
if ( glConfig.deviceSupportsGamma )
{
//
// do a sanity check on the gamma values
//
if ( ( HIBYTE( s_oldHardwareGamma[0][255] ) <= HIBYTE( s_oldHardwareGamma[0][0] ) ) ||
( HIBYTE( s_oldHardwareGamma[1][255] ) <= HIBYTE( s_oldHardwareGamma[1][0] ) ) ||
( HIBYTE( s_oldHardwareGamma[2][255] ) <= HIBYTE( s_oldHardwareGamma[2][0] ) ) )
{
glConfig.deviceSupportsGamma = qfalse;
ri.Printf( PRINT_WARNING, "WARNING: device has broken gamma support, generated gamma.dat\n" );
}
//
// make sure that we didn't have a prior crash in the game, and if so we need to
// restore the gamma values to at least a linear value
//
if ( ( HIBYTE( s_oldHardwareGamma[0][181] ) == 255 ) )
{
int g;
ri.Printf( PRINT_WARNING, "WARNING: suspicious gamma tables, using linear ramp for restoration\n" );
for ( g = 0; g < 255; g++ )
{
s_oldHardwareGamma[0][g] = g << 8;
s_oldHardwareGamma[1][g] = g << 8;
s_oldHardwareGamma[2][g] = g << 8;
}
}
}
}
}
/*
void mapGammaMax( void ) {
int i, j;
unsigned short table[3][256];
// try to figure out what win2k will let us get away with setting
for ( i = 0 ; i < 256 ; i++ ) {
if ( i >= 128 ) {
table[0][i] = table[1][i] = table[2][i] = 0xffff;
} else {
table[0][i] = table[1][i] = table[2][i] = i<<9;
}
}
for ( i = 0 ; i < 128 ; i++ ) {
for ( j = i*2 ; j < 255 ; j++ ) {
table[0][i] = table[1][i] = table[2][i] = j<<8;
if ( !SetDeviceGammaRamp( glw_state.hDC, table ) ) {
break;
}
}
table[0][i] = table[1][i] = table[2][i] = i<<9;
Com_Printf( "index %i max: %i\n", i, j-1 );
}
}
*/
/*
** GLimp_SetGamma
**
** This routine should only be called if glConfig.deviceSupportsGamma is TRUE
*/
void GLimp_SetGamma( unsigned char red[256], unsigned char green[256], unsigned char blue[256] ) {
unsigned short table[3][256];
int i, j;
int ret;
OSVERSIONINFO vinfo;
if ( !glConfig.deviceSupportsGamma || r_ignorehwgamma->integer || !glw_state.hDC ) {
return;
}
//mapGammaMax();
for ( i = 0; i < 256; i++ ) {
table[0][i] = ( ( ( unsigned short ) red[i] ) << 8 ) | red[i];
table[1][i] = ( ( ( unsigned short ) green[i] ) << 8 ) | green[i];
table[2][i] = ( ( ( unsigned short ) blue[i] ) << 8 ) | blue[i];
}
// Win2K puts this odd restriction on gamma ramps...
vinfo.dwOSVersionInfoSize = sizeof(vinfo);
GetVersionEx( &vinfo );
if ( vinfo.dwMajorVersion == 5 && vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT ) {
Com_DPrintf( "performing W2K 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;
}
}
} else {
Com_DPrintf( "skipping W2K gamma clamp.\n" );
}
// 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];
}
}
}
if ( qwglSetDeviceGammaRamp3DFX )
{
qwglSetDeviceGammaRamp3DFX( glw_state.hDC, table );
}
else
{
ret = SetDeviceGammaRamp( glw_state.hDC, table );
if ( !ret ) {
Com_Printf( "SetDeviceGammaRamp failed.\n" );
}
}
}
/*
** WG_RestoreGamma
*/
void WG_RestoreGamma( void )
{
if ( glConfig.deviceSupportsGamma )
{
if ( qwglSetDeviceGammaRamp3DFX )
{
qwglSetDeviceGammaRamp3DFX( glw_state.hDC, s_oldHardwareGamma );
}
else
{
HDC hDC;
hDC = GetDC( GetDesktopWindow() );
SetDeviceGammaRamp( hDC, s_oldHardwareGamma );
ReleaseDC( GetDesktopWindow(), hDC );
}
}
}
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