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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 e5bc29de3f0a
children 546f7c1eb755
line wrap: on
line source

.TH "SDL_CDPlayTracks" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_CDPlayTracks\- Play the given CD track(s)
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBint \fBSDL_CDPlayTracks\fP\fR(\fBSDL_CD *cdrom, int start_track, int start_frame, int ntracks, int nframes)\fR);
.SH "DESCRIPTION"
.PP
\fBSDL_CDPlayTracks\fP plays the given CD starting at track \fBstart_track\fR, for \fBntracks\fR tracks\&. 
.PP
\fBstart_frame\fR is the frame offset, from the beginning of the \fBstart_track\fR, at which to start\&. \fBnframes\fR is the frame offset, from the beginning of the last track (\fBstart_track\fR+\fBntracks\fR), at which to end playing\&.
.PP
\fBSDL_CDPlayTracks\fP should only be called after calling \fI\fBSDL_CDStatus\fP\fR to get track information about the CD\&.
.PP
.RS
\fBNote:  
.PP
Data tracks are ignored\&.
.RE
.SH "RETURN VALUE"
.PP
Returns \fB0\fR, or \fB-1\fR if there was an error\&.
.SH "EXAMPLES"
.PP
.PP
.nf
\f(CW/* assuming cdrom is a previously opened device */
/* Play the entire CD */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);

/* Play the first track */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 0, 0, 1, 0);

/* Play first 15 seconds of the 2nd track */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 1, 0, 0, CD_FPS*15);\fR
.fi
.PP
 
.SH "SEE ALSO"
.PP
\fI\fBSDL_CDPlay\fP\fR, \fI\fBSDL_CDStatus\fP\fR, \fI\fBSDL_CD\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58