Mercurial > sdl-ios-xcode
annotate include/SDL.h @ 3899:081aecdb0911 SDL-1.2
From: Gabriel Gambetta
To: SDL Mailing List <sdl@libsdl.org>
Date: Fri, 17 Nov 2006 00:39:29 -0200
Subject: [SDL] Alpha blending bug - fixed?
It turns out mm5 never got the correct value. This failed :
[...]
"movd %1, %%mm5\n\t"
: : "m" (amask), "m" (sf->Ashift) );
mm5 got 0xFF000018 instead of 0x00000018. However I did this :
Uint32 ashift = sf->Ashift;
[...]
"movd %1, %%mm5\n\t"
: : "m" (amask), "m" (ashift) );
and everything worked fine.
The only thing I could find out was that ashift is 32-bit aligned but
sf->Ashift isn't:
printf("ashift %8X [%d]\n", &ashift, (int)(&ashift) % 4);
printf("sf->Ashift %8X [%d]\n", &sf->Ashift, (int)(&sf->Ashift) % 4);
ashift at BFF0E0C4 [0]
sf->Ashift at 08AFB9CD [1]
Could this be the problem? If it is, the fix is extremely trivial.
Should I submit a patch?
--Gabriel
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 21 Nov 2006 23:17:00 +0000 |
| parents | 4ed717f9e509 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
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15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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16 License along with this library; if not, write to the Free Software |
|
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parents:
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Main include header for the SDL library */ | |
| 24 | |
| 25 #ifndef _SDL_H | |
| 26 #define _SDL_H | |
| 27 | |
|
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28 #include "SDL_main.h" |
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29 #include "SDL_stdinc.h" |
| 0 | 30 #include "SDL_audio.h" |
| 31 #include "SDL_cdrom.h" | |
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32 #include "SDL_cpuinfo.h" |
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33 #include "SDL_endian.h" |
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34 #include "SDL_error.h" |
| 0 | 35 #include "SDL_events.h" |
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36 #include "SDL_loadso.h" |
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37 #include "SDL_mutex.h" |
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38 #include "SDL_rwops.h" |
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c71e05b4dc2e
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39 #include "SDL_thread.h" |
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parents:
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40 #include "SDL_timer.h" |
| 0 | 41 #include "SDL_video.h" |
| 42 #include "SDL_version.h" | |
| 43 | |
| 44 #include "begin_code.h" | |
| 45 /* Set up for C function definitions, even when using C++ */ | |
| 46 #ifdef __cplusplus | |
| 47 extern "C" { | |
| 48 #endif | |
| 49 | |
| 50 /* As of version 0.5, SDL is loaded dynamically into the application */ | |
| 51 | |
| 52 /* These are the flags which may be passed to SDL_Init() -- you should | |
| 53 specify the subsystems which you will be using in your application. | |
| 54 */ | |
| 55 #define SDL_INIT_TIMER 0x00000001 | |
| 56 #define SDL_INIT_AUDIO 0x00000010 | |
| 57 #define SDL_INIT_VIDEO 0x00000020 | |
| 58 #define SDL_INIT_CDROM 0x00000100 | |
| 59 #define SDL_INIT_JOYSTICK 0x00000200 | |
| 60 #define SDL_INIT_NOPARACHUTE 0x00100000 /* Don't catch fatal signals */ | |
| 61 #define SDL_INIT_EVENTTHREAD 0x01000000 /* Not supported on all OS's */ | |
| 62 #define SDL_INIT_EVERYTHING 0x0000FFFF | |
| 63 | |
| 64 /* This function loads the SDL dynamically linked library and initializes | |
| 65 * the subsystems specified by 'flags' (and those satisfying dependencies) | |
| 66 * Unless the SDL_INIT_NOPARACHUTE flag is set, it will install cleanup | |
| 67 * signal handlers for some commonly ignored fatal signals (like SIGSEGV) | |
| 68 */ | |
|
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69 extern DECLSPEC int SDLCALL SDL_Init(Uint32 flags); |
| 0 | 70 |
| 71 /* This function initializes specific SDL subsystems */ | |
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72 extern DECLSPEC int SDLCALL SDL_InitSubSystem(Uint32 flags); |
| 0 | 73 |
| 74 /* This function cleans up specific SDL subsystems */ | |
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75 extern DECLSPEC void SDLCALL SDL_QuitSubSystem(Uint32 flags); |
| 0 | 76 |
| 77 /* This function returns mask of the specified subsystems which have | |
| 78 been initialized. | |
| 79 If 'flags' is 0, it returns a mask of all initialized subsystems. | |
| 80 */ | |
|
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81 extern DECLSPEC Uint32 SDLCALL SDL_WasInit(Uint32 flags); |
| 0 | 82 |
| 83 /* This function cleans up all initialized subsystems and unloads the | |
| 84 * dynamically linked library. You should call it upon all exit conditions. | |
| 85 */ | |
|
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Explicitly specify the SDL API calling convention (C by default)
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parents:
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86 extern DECLSPEC void SDLCALL SDL_Quit(void); |
| 0 | 87 |
| 88 /* Ends C function definitions when using C++ */ | |
| 89 #ifdef __cplusplus | |
| 90 } | |
| 91 #endif | |
| 92 #include "close_code.h" | |
| 93 | |
| 94 #endif /* _SDL_H */ |