Mercurial > sdl-ios-xcode
annotate INSTALL @ 1544:ab1e4c41ab71
Fixed bug #33
Mike Frysinger wrote:
> with libsdl-1.2.9, some games (like bomberclone) started
> segfaulting in Gentoo
[...snip...]
> the last change in the last hunk:
[...snip...]
> if i change the statement to read:
> (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures()
> bomberclone no longer segfaults on my box
Alex Volkov wrote:
> The test "(table[which].blit_features & GetBlitFeatures()) ==
> table[which].blit_features)" is correct, and the previous
> "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken.
I think there is potentially a slightly different cause of the above problem.
During the introduction of the Altivec code, the blit_table struct field
'alpha' got changed from a straightforward enum to a bitmask, which makes
perfect sense by itself. However, now the table driven blitter selection code
in SDL_CalculateBlitN() can choose the wrong blitters when searching for a
NO_ALPHA blitter because of the following code:
int a_need = 0;
...
(a_need & table[which].alpha) == a_need &&
When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like
Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing
alpha channel bits to appear in a non-alpha destination surface. I suppose this
could theoretically be an indirect cause of the segfault mentioned above.
I *think* this can be fixed by changing to
int a_need = NO_ALPHA;
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 15 Mar 2006 15:47:49 +0000 |
parents | 0a45995a7fc3 |
children | 00e7c6b7eb03 |
rev | line source |
---|---|
0 | 1 |
2 To compile and install SDL: | |
3 | |
4 1. Run './configure; make; make install' | |
5 | |
866
0a45995a7fc3
Date: Tue, 2 Mar 2004 11:34:54 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
533
diff
changeset
|
6 If you are compiling for Windows using gcc, read the FAQ at: |
0a45995a7fc3
Date: Tue, 2 Mar 2004 11:34:54 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
533
diff
changeset
|
7 http://www.libsdl.org/faq.php?action=listentries&category=4#42 |
0 | 8 |
9 If you are compiling using Visual C++ on Win32, you should read | |
10 the file VisualC.html | |
11 | |
12 2. Look at the example programs in ./test, and check out the HTML | |
13 documentation in ./docs to see how to use the SDL library. | |
14 | |
15 3. Join the SDL developer mailing list by sending E-mail to | |
253
b23d3c5a32f3
Updated mailing list information
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
16 sdl-request@libsdl.org |
b23d3c5a32f3
Updated mailing list information
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
17 and put "subscribe" in the subject of the message. |
0 | 18 |
253
b23d3c5a32f3
Updated mailing list information
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
19 Or alternatively you can use the web interface: |
533
263e4884f70d
*** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
253
diff
changeset
|
20 http://www.libsdl.org/mailing-list.php |
0 | 21 |
22 That's it! | |
23 Sam Lantinga <slouken@libsdl.org> |