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view include/SDL_config_minimal.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 | d951a5afaf07 |
children | 491e43f427ee 0906692aa6a4 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_config_minimal_h #define _SDL_config_minimal_h #include "SDL_platform.h" /* This is the minimal configuration that can be used to build SDL */ #include <stdarg.h> typedef signed char int8_t; typedef unsigned char uint8_t; typedef signed short int16_t; typedef unsigned short uint16_t; typedef signed int int32_t; typedef unsigned int uint32_t; typedef unsigned int size_t; typedef unsigned long uintptr_t; /* Enable the dummy audio driver (src/audio/dummy/\*.c) */ #define SDL_AUDIO_DRIVER_DUMMY 1 /* Enable the stub cdrom driver (src/cdrom/dummy/\*.c) */ #define SDL_CDROM_DISABLED 1 /* Enable the stub joystick driver (src/joystick/dummy/\*.c) */ #define SDL_JOYSTICK_DISABLED 1 /* Enable the stub shared object loader (src/loadso/dummy/\*.c) */ #define SDL_LOADSO_DISABLED 1 /* Enable the stub thread support (src/thread/generic/\*.c) */ #define SDL_THREADS_DISABLED 1 /* Enable the stub timer support (src/timer/dummy/\*.c) */ #define SDL_TIMERS_DISABLED 1 /* Enable the dummy video driver (src/video/dummy/\*.c) */ #define SDL_VIDEO_DRIVER_DUMMY 1 #endif /* _SDL_config_minimal_h */