Mercurial > sdl-ios-xcode
annotate include/SDL_thread.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 | d5d3a6fe05a1 |
| children | c121d94672cb e85e65aec22f |
| 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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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
|
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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 #ifndef _SDL_thread_h | |
| 24 #define _SDL_thread_h | |
| 25 | |
| 26 /* Header for the SDL thread management routines | |
| 27 | |
| 28 These are independent of the other SDL routines. | |
| 29 */ | |
| 30 | |
|
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31 #include "SDL_stdinc.h" |
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More header massaging... works great on Windows. ;-)
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32 #include "SDL_error.h" |
| 0 | 33 |
| 34 /* Thread synchronization primitives */ | |
| 35 #include "SDL_mutex.h" | |
| 36 | |
| 37 #include "begin_code.h" | |
| 38 /* Set up for C function definitions, even when using C++ */ | |
| 39 #ifdef __cplusplus | |
| 40 extern "C" { | |
| 41 #endif | |
| 42 | |
| 43 /* The SDL thread structure, defined in SDL_thread.c */ | |
| 44 struct SDL_Thread; | |
| 45 typedef struct SDL_Thread SDL_Thread; | |
| 46 | |
| 47 /* Create a thread */ | |
|
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48 #if (defined(__WIN32__) && !defined(HAVE_LIBC)) || defined(__OS2__) |
| 1190 | 49 /* |
| 50 We compile SDL into a DLL on OS/2. This means, that it's the DLL which | |
| 51 creates a new thread for the calling process with the SDL_CreateThread() | |
| 52 API. There is a problem with this, that only the RTL of the SDL.DLL will | |
| 53 be initialized for those threads, and not the RTL of the calling application! | |
| 54 To solve this, we make a little hack here. | |
| 55 We'll always use the caller's _beginthread() and _endthread() APIs to | |
|
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56 start a new thread. This way, if it's the SDL.DLL which uses this API, |
| 1190 | 57 then the RTL of SDL.DLL will be used to create the new thread, and if it's |
| 58 the application, then the RTL of the application will be used. | |
| 59 So, in short: | |
| 60 Always use the _beginthread() and _endthread() of the calling runtime library! | |
| 61 */ | |
|
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Enabled libc support on Win32, so we don't break binary compatibility in 1.2
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62 #define SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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Updated WinCE support by Dmitry (with some tweaks)
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63 #ifndef _WIN32_WCE |
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Enabled libc support on Win32, so we don't break binary compatibility in 1.2
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64 #include <process.h> /* This has _beginthread() and _endthread() defined! */ |
| 1190 | 65 #endif |
| 66 | |
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67 #ifdef __OS2__ |
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68 typedef int (*pfnSDL_CurrentBeginThread)(void (*func)(void *), void *, unsigned, void *arg); |
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69 typedef void (*pfnSDL_CurrentEndThread)(void); |
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70 #elif __GNUC__ |
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71 typedef unsigned long (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned, |
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72 unsigned (__stdcall *func)(void *), void *arg, |
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73 unsigned, unsigned *threadID); |
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74 typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code); |
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Sam Lantinga <slouken@libsdl.org>
parents:
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75 #else |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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76 typedef uintptr_t (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned, |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
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changeset
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77 unsigned (__stdcall *func)(void *), void *arg, |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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78 unsigned, unsigned *threadID); |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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79 typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code); |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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80 #endif |
| 1190 | 81 |
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82 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread); |
| 1190 | 83 |
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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84 #ifdef __OS2__ |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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85 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthread, _endthread) |
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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86 #elif defined(_WIN32_WCE) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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87 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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88 #else |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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89 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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90 #endif |
| 1190 | 91 #else |
|
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92 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data); |
| 1190 | 93 #endif |
| 0 | 94 |
| 95 /* Get the 32-bit thread identifier for the current thread */ | |
|
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96 extern DECLSPEC Uint32 SDLCALL SDL_ThreadID(void); |
| 0 | 97 |
| 98 /* Get the 32-bit thread identifier for the specified thread, | |
| 99 equivalent to SDL_ThreadID() if the specified thread is NULL. | |
| 100 */ | |
|
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101 extern DECLSPEC Uint32 SDLCALL SDL_GetThreadID(SDL_Thread *thread); |
| 0 | 102 |
| 103 /* Wait for a thread to finish. | |
| 104 The return code for the thread function is placed in the area | |
| 105 pointed to by 'status', if 'status' is not NULL. | |
| 106 */ | |
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107 extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status); |
| 0 | 108 |
| 109 /* Forcefully kill a thread without worrying about its state */ | |
|
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110 extern DECLSPEC void SDLCALL SDL_KillThread(SDL_Thread *thread); |
| 0 | 111 |
| 112 | |
| 113 /* Ends C function definitions when using C++ */ | |
| 114 #ifdef __cplusplus | |
| 115 } | |
| 116 #endif | |
| 117 #include "close_code.h" | |
| 118 | |
| 119 #endif /* _SDL_thread_h */ |