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view src/video/wscons/SDL_wsconsvideo.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 | d910939febfa |
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 */ #include "SDL_config.h" #ifndef _SDL_wsconsvideo_h #define _SDL_wsconsvideo_h #include <sys/time.h> #include <termios.h> #include <dev/wscons/wsconsio.h> #include "SDL_mouse.h" #include "SDL_mutex.h" #include "../SDL_sysvideo.h" void WSCONS_ReportError(char *fmt, ...); /* Hidden "this" pointer for the video functions */ #define _THIS SDL_VideoDevice *this #define private (this->hidden) /* Private display data */ typedef void WSCONS_bitBlit(Uint8 *src_pos, int srcRightDelta, // pixels, not bytes int srcDownDelta, // pixels, not bytes Uint8 *dst_pos, int dst_linebytes, int width, int height); struct SDL_PrivateVideoData { int fd; /* file descriptor of open device */ struct wsdisplay_fbinfo info; /* frame buffer characteristics */ int physlinebytes; /* number of bytes per row */ int redMask, greenMask, blueMask; Uint8 *fbstart; /* These refer to the surface used, */ int fblinebytes; /* physical frame buffer or shadow. */ size_t fbmem_len; Uint8 *physmem; Uint8 *shadowmem; int rotate; int shadowFB; /* Tells whether a shadow is being used. */ WSCONS_bitBlit *blitFunc; SDL_Rect *SDL_modelist[2]; unsigned int kbdType; int did_save_tty; struct termios saved_tty; }; #endif /* _SDL_wsconsvideo_h */