annotate docs/man3/SDL_CD.3 @ 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 e5bc29de3f0a
children 546f7c1eb755
rev   line source
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1 .TH "SDL_CD" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference"
0
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2 .SH "NAME"
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3 SDL_CD\- CDROM Drive Information
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4 .SH "STRUCTURE DEFINITION"
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5 .PP
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6 .nf
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7 \f(CWtypedef struct{
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8 int id;
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9 CDstatus status;
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10 int numtracks;
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11 int cur_track;
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12 int cur_frame;
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13 SDL_CDtrack track[SDL_MAX_TRACKS+1];
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14 } SDL_CD;\fR
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15 .fi
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16 .PP
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17 .SH "STRUCTURE DATA"
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18 .TP 20
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19 \fBid\fR
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20 Private drive identifier
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21 .TP 20
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22 \fBstatus\fR
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23 Drive \fIstatus\fR
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24 .TP 20
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25 \fBnumtracks\fR
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26 Number of tracks on the CD
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27 .TP 20
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28 \fBcur_track\fR
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29 Current track
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30 .TP 20
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31 \fBcur_frame\fR
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32 Current frame offset within the track
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33 .TP 20
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34 \fBtrack\fR[SDL_MAX_TRACKS+1]
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35 Array of track descriptions\&. (see \fI\fBSDL_CDtrack\fR\fR)
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36 .SH "DESCRIPTION"
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37 .PP
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38 An \fBSDL_CD\fR structure is returned by \fI\fBSDL_CDOpen\fP\fR\&. It represents an opened CDROM device and stores information on the layout of the tracks on the disc\&.
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39 .PP
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40 A frame is the base data unit of a CD\&. \fBCD_FPS\fP frames is equal to 1 second of music\&. SDL provides two macros for converting between time and frames: \fBFRAMES_TO_MSF(f, M,S,F)\fP and \fBMSF_TO_FRAMES\fP\&.
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41 .SH "EXAMPLES"
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42 .PP
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43 .nf
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44 \f(CWint min, sec, frame;
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45 int frame_offset;
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46
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47 FRAMES_TO_MSF(cdrom->cur_frame, &min, &sec, &frame);
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48 printf("Current Position: %d minutes, %d seconds, %d frames
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49 ", min, sec, frame);
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50
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51 frame_offset=MSF_TO_FRAMES(min, sec, frame);\fR
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52 .fi
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53 .PP
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54 .SH "SEE ALSO"
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55 .PP
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56 \fI\fBSDL_CDOpen\fP\fR, \fI\fBSDL_CDtrack\fR\fR
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57 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58