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

The latest development version of SDL is available via Subversion.
Subversion allows you to get up-to-the-minute fixes and enhancements;
as a developer works on a source tree, you can use svn to mirror that
source tree instead of waiting for an official release. Please look
at the Subversion website ( http://subversion.tigris.org/ ) for more
information on using svn, where you can also download software for
MacOS, Windows, and Unix systems.

  svn checkout svn://libsdl.org/trunk/SDL

If you are building SDL with an IDE, you will need to copy the file
include/SDL_config.h.default to include/SDL_config.h before building.

If you are building SDL via configure, you will need to run autogen.sh
before running configure.

There is a web interface to the subversion repository at:
	http://www.libsdl.org/cgi/viewvc.cgi