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- Applied a patch from Victor Shkamerda <vvs@auto.bnm.org>

Browse source 
that fixes gamma under GLX.  His comments:

  * This Linux Quake 2 patch allows to change OpenGL gamma
    on the fly without vid_restart.  It uses hardware gamma
	where available (tested on XFree86 4.2.0 with DRI)
  * This is for GLX only, SDL should have its own
    implementation, based on its own gamma manipulation
	functions
  * This is implemented for fullscreen only.  I'm not sure
    if it shuld be implemented for windowed mode
  * I've got the idea from MrG's BeefQuake for Windows, but
    the implementation is completely mine

  I can confirm that this works beautifully with XFree86
  4.1, too.
This commit is contained in:
Jamie Wilkinson 2002-05-02 14:35:41 +00:00
parent b1d6239d1d
commit 9a018e3ad7
5 changed files with 91 additions and 43 deletions
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40
src/gl_glx.c
View file

@ -111,6 +111,7 @@ static XF86VidModeModeInfo **vidmodes;
//static int default_dotclock_vidmode;
static int num_vidmodes;
static qboolean vidmode_active = false;
static XF86VidModeGamma oldgamma;
static qboolean mlooking;
@ -752,6 +753,8 @@ int GLimp_SetMode( unsigned int *pwidth, unsigned int *pheight, int mode, qboole
return rserr_invalid_mode;
}
gl_state.hwgamma = false;
if (vidmode_ext) {
int best_fit, best_dist, dist, x, y;
@ -784,6 +787,15 @@ int GLimp_SetMode( unsigned int *pwidth, unsigned int *pheight, int mode, qboole
XF86VidModeSwitchToMode(dpy, scrnum, vidmodes[best_fit]);
vidmode_active = true;
if (XF86VidModeGetGamma(dpy, scrnum, &oldgamma)) {
gl_state.hwgamma = true;
/* We can not reliably detect hardware gamma
* changes across software gamma calls, which
* can reset the flag, so change it anyway */
vid_gamma->modified = true;
ri.Con_Printf( PRINT_ALL, "Using hardware gamma\n");
}
// Move the viewport to top left
XF86VidModeSetViewPort(dpy, scrnum, 0, 0);
} else
@ -901,6 +913,13 @@ void GLimp_Shutdown( void )
XDestroyWindow(dpy, win);
if (ctx)
qglXDestroyContext(dpy, ctx);
if (gl_state.hwgamma) {
XF86VidModeSetGamma(dpy, scrnum, &oldgamma);
/* The gamma has changed, but SetMode will change it
* anyway, so why bother?
vid_gamma->modified = true;
*/
}
if (vidmode_active)
XF86VidModeSwitchToMode(dpy, scrnum, vidmodes[0]);
XUngrabKeyboard(dpy, CurrentTime);
@ -967,6 +986,27 @@ void GLimp_EndFrame (void)
qglXSwapBuffers(dpy, win);
}
/* UpdateHardwareGamma
*
* We are using gamma relative to the desktop, so that we can share it
* with software renderer and don't require to change desktop gamma to
* match hardware gamma image brightness. It seems that Quake 3 is
* using the opposite approach, but it has no software renderer, after
* all.
*/
void UpdateHardwareGamma() {
XF86VidModeGamma gamma;
float g;
g = (1.3 - vid_gamma->value + 1);
g = (g > 1) ? g : 1;
gamma.red = oldgamma.red * g;
gamma.green = oldgamma.green * g;
gamma.blue = oldgamma.blue * g;
ri.Con_Printf(PRINT_ALL, "Setting gamma to %f\n", g);
XF86VidModeSetGamma(dpy, scrnum, &gamma);
}
/*
** GLimp_AppActivate
*/

42
src/gl_image.c
View file

@ -1,22 +1,23 @@
/*
Copyright (C) 1997-2001 Id Software, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id$
*
* Copyright (C) 1997-2001 Id Software, Inc.
* Copyright (c) 2002 The Quakeforge Project.
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "gl_local.h"
@ -1537,8 +1538,7 @@ void GL_InitImages (void)
for ( i = 0; i < 256; i++ )
{
if ( g == 1 )
{
if (g == 1 || gl_state.hwgamma) {
gammatable[i] = i;
}
else

41
src/gl_local.h
View file

@ -1,22 +1,23 @@
/*
Copyright (C) 1997-2001 Id Software, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id$
*
* Copyright (C) 1997-2001 Id Software, Inc.
* Copyright (c) 2002 The Quakeforge Project.
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef _WIN32
# include <windows.h>
@ -428,6 +429,8 @@ typedef struct
float camera_separation;
qboolean stereo_enabled;
qboolean hwgamma;
unsigned char originalRedGammaTable[256];
unsigned char originalGreenGammaTable[256];
unsigned char originalBlueGammaTable[256];

8
src/gl_rmain.c
View file

@ -1446,6 +1446,9 @@ void R_Shutdown (void)
R_BeginFrame
@@@@@@@@@@@@@@@@@@@@@
*/
extern void UpdateHardwareGamma();
void R_BeginFrame( float camera_separation )
{
@ -1481,8 +1484,9 @@ void R_BeginFrame( float camera_separation )
{
vid_gamma->modified = false;
if ( gl_config.renderer & ( GL_RENDERER_VOODOO ) )
{
if (gl_state.hwgamma) {
UpdateHardwareGamma();
} else if (gl_config.renderer & (GL_RENDERER_VOODOO)) {
char envbuffer[1024];
float g;

3
src/vid_menu.c
View file

@ -111,7 +111,8 @@ static void BrightnessCallback( void *s )
if ( Q_stricmp( vid_ref->string, "soft" ) == 0 ||
Q_stricmp( vid_ref->string, "softx" ) == 0 ||
Q_stricmp( vid_ref->string, "softsdl" ) == 0 )
Q_stricmp( vid_ref->string, "softsdl" ) == 0 ||
Q_stricmp( vid_ref->string, "glx" ) == 0 )
{
float gamma = ( 0.8 - ( slider->curvalue/10.0 - 0.5 ) ) + 0.5;