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view test/README @ 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 | 68f2b997758e |
| children | e6cd882e3ac0 5baad3758427 |
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These are test programs for the SDL library: testver Check the version and dynamic loading and endianness testtypes Check to see if the data types are the correct size testhread Hacked up test of multi-threading testlock Hacked up test of multi-threading and locking testerror Tests multi-threaded error handling testsem Tests SDL's semaphore implementation testtimer Test the timer facilities loopwave Audio test -- loop playing a WAV file testcdrom Sample audio CD control program testkeys List the available keyboard keys testvidinfo Show the pixel format of the display and perfom the benchmark checkkeys Watch the key events to check the keyboard testwin Display a BMP image at various depths graywin Display a gray gradient and center mouse on spacebar testsprite Example of fast sprite movement on the screen testbitmap Test displaying 1-bit bitmaps testalpha Display an alpha faded icon -- paint with mouse testwm Test window manager -- title, icon, events threadwin Test multi-threaded event handling testgl A very simple example of using OpenGL with SDL testjoystick List joysticks and watch joystick events testoverlay Tests the software/hardware overlay functionality. testoverlay2 Tests the overlay flickering/scaling during playback. testblitspeed Tests performance of SDL's blitters and converters.