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;

.TH "SDL_Quit" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_Quit\- Shut down SDL
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBvoid \fBSDL_Quit\fP\fR(\fBvoid\fR);
.SH "DESCRIPTION"
.PP
\fBSDL_Quit\fP shuts down all SDL subsystems and frees the resources allocated to them\&. This should always be called before you exit\&. For the sake of simplicity you can set \fBSDL_Quit\fP as your \fBatexit\fP call, like: 
.PP
.nf
\f(CWSDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO);
atexit(SDL_Quit);
\&.
\&.\fR
.fi
.PP
.PP
.RS
\fBNote:  
.PP
While using \fBatexit\fP maybe be fine for small programs, more advanced users should shut down SDL in their own cleanup code\&. Plus, using \fBatexit\fP in a library is a sure way to crash dynamically loaded code
.RE
.SH "SEE ALSO"
.PP
\fI\fBSDL_QuitSubsystem\fP\fR, \fI\fBSDL_Init\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00