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_PeepEvents" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_PeepEvents\- Checks the event queue for messages and optionally returns them\&.
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBint \fBSDL_PeepEvents\fP\fR(\fBSDL_Event *events, int numevents, SDL_eventaction action, Uint32 mask\fR);
.SH "DESCRIPTION"
.PP
Checks the event queue for messages and optionally returns them\&.
.PP
If \fBaction\fR is \fBSDL_ADDEVENT\fP, up to \fBnumevents\fR events will be added to the back of the event queue\&.
.PP
If \fBaction\fR is \fBSDL_PEEKEVENT\fP, up to \fBnumevents\fR events at the front of the event queue, matching \fI\fBmask\fR\fR, will be returned and will not be removed from the queue\&.
.PP
If \fBaction\fR is \fBSDL_GETEVENT\fP, up to \fBnumevents\fR events at the front of the event queue, matching \fI\fBmask\fR\fR, will be returned and will be removed from the queue\&.
.PP
This function is thread-safe\&.
.SH "RETURN VALUE"
.PP
This function returns the number of events actually stored, or \fB-1\fR if there was an error\&. 
.SH "SEE ALSO"
.PP
\fI\fBSDL_Event\fR\fR, \fI\fBSDL_PollEvent\fP\fR, \fI\fBSDL_PushEvent\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59