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view include/SDL_main.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 | 3c45c578d480 |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #ifndef _SDL_main_h #define _SDL_main_h #include "SDL_stdinc.h" /* Redefine main() on Win32 and MacOS so that it is called by winmain.c */ #if defined(__WIN32__) || \ (defined(__MWERKS__) && !defined(__BEOS__)) || \ defined(__MACOS__) || defined(__MACOSX__) || \ defined(__SYMBIAN32__) || defined(QWS) #ifdef __cplusplus #define C_LINKAGE "C" #else #define C_LINKAGE #endif /* __cplusplus */ /* The application's main() function must be called with C linkage, and should be declared like this: #ifdef __cplusplus extern "C" #endif int main(int argc, char *argv[]) { } */ #define main SDL_main /* The prototype for the application's main() function */ extern C_LINKAGE int SDL_main(int argc, char *argv[]); /* From the SDL library code -- needed for registering the app on Win32 */ #ifdef __WIN32__ #include "begin_code.h" #ifdef __cplusplus extern "C" { #endif /* This should be called from your WinMain() function, if any */ extern DECLSPEC void SDLCALL SDL_SetModuleHandle(void *hInst); /* This can also be called, but is no longer necessary */ extern DECLSPEC int SDLCALL SDL_RegisterApp(char *name, Uint32 style, void *hInst); /* This can also be called, but is no longer necessary (SDL_Quit calls it) */ extern DECLSPEC void SDLCALL SDL_UnregisterApp(void); #ifdef __cplusplus } #endif #include "close_code.h" #endif /* From the SDL library code -- needed for registering QuickDraw on MacOS */ #if defined(__MACOS__) #include "begin_code.h" #ifdef __cplusplus extern "C" { #endif /* Forward declaration so we don't need to include QuickDraw.h */ struct QDGlobals; /* This should be called from your main() function, if any */ extern DECLSPEC void SDLCALL SDL_InitQuickDraw(struct QDGlobals *the_qd); #ifdef __cplusplus } #endif #include "close_code.h" #endif #endif /* Need to redefine main()? */ #endif /* _SDL_main_h */