Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gamma.c @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 25 Jul 2004 18:31:50 +0000 |
| parents | b8d311d90021 |
| children | 045f186426e1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include "SDL.h" | |
| 29 #include "SDL_events.h" | |
| 30 #include "SDL_events_c.h" | |
| 31 #include "SDL_x11video.h" | |
| 32 | |
| 33 /* From the X server sources... */ | |
| 34 #define MAX_GAMMA 10.0 | |
| 35 #define MIN_GAMMA (1.0/MAX_GAMMA) | |
| 36 | |
| 37 static int X11_SetGammaNoLock(_THIS, float red, float green, float blue) | |
| 38 { | |
| 39 #ifdef XFREE86_VMGAMMA | |
|
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40 if (use_vidmode >= 200) { |
|
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41 SDL_NAME(XF86VidModeGamma) gamma; |
| 0 | 42 Bool succeeded; |
| 43 | |
| 44 /* Clamp the gamma values */ | |
| 45 if ( red < MIN_GAMMA ) { | |
| 46 gamma.red = MIN_GAMMA; | |
| 47 } else | |
| 48 if ( red > MAX_GAMMA ) { | |
| 49 gamma.red = MAX_GAMMA; | |
| 50 } else { | |
| 51 gamma.red = red; | |
| 52 } | |
| 53 if ( green < MIN_GAMMA ) { | |
| 54 gamma.green = MIN_GAMMA; | |
| 55 } else | |
| 56 if ( green > MAX_GAMMA ) { | |
| 57 gamma.green = MAX_GAMMA; | |
| 58 } else { | |
| 59 gamma.green = green; | |
| 60 } | |
| 61 if ( blue < MIN_GAMMA ) { | |
| 62 gamma.blue = MIN_GAMMA; | |
| 63 } else | |
| 64 if ( blue > MAX_GAMMA ) { | |
| 65 gamma.blue = MAX_GAMMA; | |
| 66 } else { | |
| 67 gamma.blue = blue; | |
| 68 } | |
| 69 if ( SDL_GetAppState() & SDL_APPACTIVE ) { | |
|
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70 succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma); |
| 0 | 71 XSync(SDL_Display, False); |
| 72 } else { | |
| 73 gamma_saved[0] = gamma.red; | |
| 74 gamma_saved[1] = gamma.green; | |
| 75 gamma_saved[2] = gamma.blue; | |
| 76 succeeded = True; | |
| 77 } | |
| 78 if ( succeeded ) { | |
| 79 ++gamma_changed; | |
| 80 } | |
| 81 return succeeded ? 0 : -1; | |
| 82 } | |
| 83 #endif | |
| 84 SDL_SetError("Gamma correction not supported"); | |
| 85 return -1; | |
| 86 } | |
| 87 int X11_SetVidModeGamma(_THIS, float red, float green, float blue) | |
| 88 { | |
| 89 int result; | |
| 90 | |
| 91 SDL_Lock_EventThread(); | |
| 92 result = X11_SetGammaNoLock(this, red, green, blue); | |
| 93 SDL_Unlock_EventThread(); | |
| 94 | |
| 95 return(result); | |
| 96 } | |
| 97 | |
| 98 static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue) | |
| 99 { | |
| 100 #ifdef XFREE86_VMGAMMA | |
|
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101 if (use_vidmode >= 200) { |
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102 SDL_NAME(XF86VidModeGamma) gamma; |
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103 if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) { |
| 0 | 104 *red = gamma.red; |
| 105 *green = gamma.green; | |
| 106 *blue = gamma.blue; | |
| 107 return 0; | |
| 108 } | |
| 109 return -1; | |
| 110 } | |
| 111 #endif | |
| 112 return -1; | |
| 113 } | |
| 114 int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue) | |
| 115 { | |
| 116 int result; | |
| 117 | |
| 118 SDL_Lock_EventThread(); | |
| 119 result = X11_GetGammaNoLock(this, red, green, blue); | |
| 120 SDL_Unlock_EventThread(); | |
| 121 | |
| 122 return(result); | |
| 123 } | |
| 124 | |
| 125 void X11_SaveVidModeGamma(_THIS) | |
| 126 { | |
| 127 /* Try to save the current gamma, otherwise disable gamma control */ | |
| 128 if ( X11_GetGammaNoLock(this, | |
| 129 &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) { | |
| 130 this->SetGamma = 0; | |
| 131 this->GetGamma = 0; | |
| 132 } | |
| 133 gamma_changed = 0; | |
| 134 } | |
| 135 void X11_SwapVidModeGamma(_THIS) | |
| 136 { | |
| 137 float new_gamma[3]; | |
| 138 | |
| 139 if ( gamma_changed ) { | |
| 140 new_gamma[0] = gamma_saved[0]; | |
| 141 new_gamma[1] = gamma_saved[1]; | |
| 142 new_gamma[2] = gamma_saved[2]; | |
| 143 X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]); | |
| 144 X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]); | |
| 145 } | |
| 146 } |