Mercurial > sdl-ios-xcode
annotate src/cdrom/SDL_cdrom.c @ 689:5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
From: Stephane Marchesin
Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection
I think everything is correct now. I've done as much testing as I could,
but some real-world testing wouldn't hurt, I think.
The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch
If you do byte-by-byte comparison of the output between C and MMX
functions, you'll notice that the results for 555 and 565 RGB alpha
blits aren't exactly the same. This is because MMX functions for 555 and
565 RGB have an higher accuracy. If you want the exact same behaviour
that's possible by masking the three lower alpha bits in the MMX
functions. Just ask !
I removed one MMX function because after I fixed it to match its C
equivalent, it revealed to be slower than the C version on a PIII
(although a bit faster on an Athlon XP).
I've also added MMX and PIII replacements for SDL_memcpy. Those provide
some speed up in testvidinfo -benchmark (at least for me, under linux &
X11).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 22 Aug 2003 05:51:19 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This is the CD-audio control API for Simple DirectMedia Layer */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_cdrom.h" | |
| 36 #include "SDL_syscdrom.h" | |
| 37 | |
| 38 #if !defined(macintosh) | |
| 39 #define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */ | |
| 40 #endif | |
| 41 | |
| 42 static int SDL_cdinitted = 0; | |
| 43 static SDL_CD *default_cdrom; | |
| 44 | |
| 45 /* The system level CD-ROM control functions */ | |
| 46 struct CDcaps SDL_CDcaps = { | |
| 47 NULL, /* Name */ | |
| 48 NULL, /* Open */ | |
| 49 NULL, /* GetTOC */ | |
| 50 NULL, /* Status */ | |
| 51 NULL, /* Play */ | |
| 52 NULL, /* Pause */ | |
| 53 NULL, /* Resume */ | |
| 54 NULL, /* Stop */ | |
| 55 NULL, /* Eject */ | |
| 56 NULL, /* Close */ | |
| 57 }; | |
| 58 int SDL_numcds; | |
| 59 | |
| 60 int SDL_CDROMInit(void) | |
| 61 { | |
| 62 int retval; | |
| 63 | |
| 64 SDL_numcds = 0; | |
| 65 retval = SDL_SYS_CDInit(); | |
| 66 if ( retval == 0 ) { | |
| 67 SDL_cdinitted = 1; | |
| 68 } | |
| 69 default_cdrom = NULL; | |
| 70 return(retval); | |
| 71 } | |
| 72 | |
| 73 /* Check to see if the CD-ROM subsystem has been initialized */ | |
| 74 static int CheckInit(int check_cdrom, SDL_CD **cdrom) | |
| 75 { | |
| 76 int okay; | |
| 77 | |
| 78 okay = SDL_cdinitted; | |
| 79 if ( check_cdrom && (*cdrom == NULL) ) { | |
| 80 *cdrom = default_cdrom; | |
| 81 if ( *cdrom == NULL ) { | |
| 82 SDL_SetError("CD-ROM not opened"); | |
| 83 okay = 0; | |
| 84 } | |
| 85 } | |
| 86 if ( ! SDL_cdinitted ) { | |
| 87 SDL_SetError("CD-ROM subsystem not initialized"); | |
| 88 } | |
| 89 return(okay); | |
| 90 } | |
| 91 | |
| 92 int SDL_CDNumDrives(void) | |
| 93 { | |
| 94 if ( ! CheckInit(0, NULL) ) { | |
| 95 return(-1); | |
| 96 } | |
| 97 return(SDL_numcds); | |
| 98 } | |
| 99 | |
| 100 const char *SDL_CDName(int drive) | |
| 101 { | |
| 102 if ( ! CheckInit(0, NULL) ) { | |
| 103 return(NULL); | |
| 104 } | |
| 105 if ( drive >= SDL_numcds ) { | |
| 106 SDL_SetError("Invalid CD-ROM drive index"); | |
| 107 return(NULL); | |
| 108 } | |
| 109 if ( SDL_CDcaps.Name ) { | |
| 110 return(SDL_CDcaps.Name(drive)); | |
| 111 } else { | |
| 112 return(""); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 SDL_CD *SDL_CDOpen(int drive) | |
| 117 { | |
| 118 struct SDL_CD *cdrom; | |
| 119 | |
| 120 if ( ! CheckInit(0, NULL) ) { | |
| 121 return(NULL); | |
| 122 } | |
| 123 if ( drive >= SDL_numcds ) { | |
| 124 SDL_SetError("Invalid CD-ROM drive index"); | |
| 125 return(NULL); | |
| 126 } | |
| 127 cdrom = (SDL_CD *)malloc(sizeof(*cdrom)); | |
| 128 if ( cdrom == NULL ) { | |
| 129 SDL_OutOfMemory(); | |
| 130 return(NULL); | |
| 131 } | |
| 132 memset(cdrom, 0, sizeof(*cdrom)); | |
| 133 cdrom->id = SDL_CDcaps.Open(drive); | |
| 134 if ( cdrom->id < 0 ) { | |
| 135 free(cdrom); | |
| 136 return(NULL); | |
| 137 } | |
| 138 default_cdrom = cdrom; | |
| 139 return(cdrom); | |
| 140 } | |
| 141 | |
| 142 CDstatus SDL_CDStatus(SDL_CD *cdrom) | |
| 143 { | |
| 144 CDstatus status; | |
| 145 int i; | |
| 146 Uint32 position; | |
| 147 | |
| 148 /* Check if the CD-ROM subsystem has been initialized */ | |
| 149 if ( ! CheckInit(1, &cdrom) ) { | |
| 150 return(CD_ERROR); | |
| 151 } | |
| 152 | |
| 153 /* Get the current status of the drive */ | |
| 154 cdrom->numtracks = 0; | |
| 155 cdrom->cur_track = 0; | |
| 156 cdrom->cur_frame = 0; | |
| 157 status = SDL_CDcaps.Status(cdrom, &i); | |
| 158 position = (Uint32)i; | |
| 159 cdrom->status = status; | |
| 160 | |
| 161 /* Get the table of contents, if there's a CD available */ | |
| 162 if ( CD_INDRIVE(status) ) { | |
| 163 if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) { | |
| 164 status = CD_ERROR; | |
| 165 } | |
| 166 /* If the drive is playing, get current play position */ | |
| 167 if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) { | |
| 168 for ( i=1; cdrom->track[i].offset <= position; ++i ) { | |
| 169 /* Keep looking */; | |
| 170 } | |
| 171 #ifdef DEBUG_CDROM | |
| 172 fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n", | |
| 173 position, i-1, cdrom->track[i-1].offset); | |
| 174 #endif | |
| 175 cdrom->cur_track = i-1; | |
| 176 position -= cdrom->track[cdrom->cur_track].offset; | |
| 177 cdrom->cur_frame = position; | |
| 178 } | |
| 179 } | |
| 180 return(status); | |
| 181 } | |
| 182 | |
| 183 int SDL_CDPlayTracks(SDL_CD *cdrom, | |
| 184 int strack, int sframe, int ntracks, int nframes) | |
| 185 { | |
| 186 int etrack, eframe; | |
| 187 int start, length; | |
| 188 | |
| 189 /* Check if the CD-ROM subsystem has been initialized */ | |
| 190 if ( ! CheckInit(1, &cdrom) ) { | |
| 191 return(CD_ERROR); | |
| 192 } | |
| 193 | |
| 194 /* Determine the starting and ending tracks */ | |
| 195 if ( (strack < 0) || (strack >= cdrom->numtracks) ) { | |
| 196 SDL_SetError("Invalid starting track"); | |
| 197 return(CD_ERROR); | |
| 198 } | |
| 199 if ( ! ntracks && ! nframes ) { | |
| 200 etrack = cdrom->numtracks; | |
| 201 eframe = 0; | |
| 202 } else { | |
| 203 etrack = strack+ntracks; | |
| 204 if ( etrack == strack ) { | |
| 205 eframe = sframe + nframes; | |
| 206 } else { | |
| 207 eframe = nframes; | |
| 208 } | |
| 209 } | |
| 210 if ( etrack > cdrom->numtracks ) { | |
| 211 SDL_SetError("Invalid play length"); | |
| 212 return(CD_ERROR); | |
| 213 } | |
| 214 | |
| 215 /* Skip data tracks and verify frame offsets */ | |
| 216 while ( (strack <= etrack) && | |
| 217 (cdrom->track[strack].type == SDL_DATA_TRACK) ) { | |
| 218 ++strack; | |
| 219 } | |
| 220 if ( sframe >= (int)cdrom->track[strack].length ) { | |
| 221 SDL_SetError("Invalid starting frame for track %d", strack); | |
| 222 return(CD_ERROR); | |
| 223 } | |
| 224 while ( (etrack > strack) && | |
| 225 (cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) { | |
| 226 --etrack; | |
| 227 } | |
| 228 if ( eframe > (int)cdrom->track[etrack].length ) { | |
| 229 SDL_SetError("Invalid ending frame for track %d", etrack); | |
| 230 return(CD_ERROR); | |
| 231 } | |
| 232 | |
| 233 /* Determine start frame and play length */ | |
| 234 start = (cdrom->track[strack].offset+sframe); | |
| 235 length = (cdrom->track[etrack].offset+eframe)-start; | |
| 236 #ifdef CLIP_FRAMES | |
| 237 /* I've never seen this necessary, but xmcd does it.. */ | |
| 238 length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */ | |
| 239 #endif | |
| 240 if ( length < 0 ) { | |
| 241 return(0); | |
| 242 } | |
| 243 | |
| 244 /* Play! */ | |
| 245 #ifdef DEBUG_CDROM | |
| 246 fprintf(stderr, "Playing %d frames at offset %d\n", length, start); | |
| 247 #endif | |
| 248 return(SDL_CDcaps.Play(cdrom, start, length)); | |
| 249 } | |
| 250 | |
| 251 int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length) | |
| 252 { | |
| 253 /* Check if the CD-ROM subsystem has been initialized */ | |
| 254 if ( ! CheckInit(1, &cdrom) ) { | |
| 255 return(CD_ERROR); | |
| 256 } | |
| 257 | |
| 258 return(SDL_CDcaps.Play(cdrom, sframe, length)); | |
| 259 } | |
| 260 | |
| 261 int SDL_CDPause(SDL_CD *cdrom) | |
| 262 { | |
| 263 CDstatus status; | |
| 264 int retval; | |
| 265 | |
| 266 /* Check if the CD-ROM subsystem has been initialized */ | |
| 267 if ( ! CheckInit(1, &cdrom) ) { | |
| 268 return(CD_ERROR); | |
| 269 } | |
| 270 | |
| 271 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 272 switch (status) { | |
| 273 case CD_PLAYING: | |
| 274 retval = SDL_CDcaps.Pause(cdrom); | |
| 275 break; | |
| 276 default: | |
| 277 retval = 0; | |
| 278 break; | |
| 279 } | |
| 280 return(retval); | |
| 281 } | |
| 282 | |
| 283 int SDL_CDResume(SDL_CD *cdrom) | |
| 284 { | |
| 285 CDstatus status; | |
| 286 int retval; | |
| 287 | |
| 288 /* Check if the CD-ROM subsystem has been initialized */ | |
| 289 if ( ! CheckInit(1, &cdrom) ) { | |
| 290 return(CD_ERROR); | |
| 291 } | |
| 292 | |
| 293 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 294 switch (status) { | |
| 295 case CD_PAUSED: | |
| 296 retval = SDL_CDcaps.Resume(cdrom); | |
| 297 default: | |
| 298 retval = 0; | |
| 299 break; | |
| 300 } | |
| 301 return(retval); | |
| 302 } | |
| 303 | |
| 304 int SDL_CDStop(SDL_CD *cdrom) | |
| 305 { | |
| 306 CDstatus status; | |
| 307 int retval; | |
| 308 | |
| 309 /* Check if the CD-ROM subsystem has been initialized */ | |
| 310 if ( ! CheckInit(1, &cdrom) ) { | |
| 311 return(CD_ERROR); | |
| 312 } | |
| 313 | |
| 314 status = SDL_CDcaps.Status(cdrom, NULL); | |
| 315 switch (status) { | |
| 316 case CD_PLAYING: | |
| 317 case CD_PAUSED: | |
| 318 retval = SDL_CDcaps.Stop(cdrom); | |
| 319 default: | |
| 320 retval = 0; | |
| 321 break; | |
| 322 } | |
| 323 return(retval); | |
| 324 } | |
| 325 | |
| 326 int SDL_CDEject(SDL_CD *cdrom) | |
| 327 { | |
| 328 /* Check if the CD-ROM subsystem has been initialized */ | |
| 329 if ( ! CheckInit(1, &cdrom) ) { | |
| 330 return(CD_ERROR); | |
| 331 } | |
| 332 return(SDL_CDcaps.Eject(cdrom)); | |
| 333 } | |
| 334 | |
| 335 void SDL_CDClose(SDL_CD *cdrom) | |
| 336 { | |
| 337 /* Check if the CD-ROM subsystem has been initialized */ | |
| 338 if ( ! CheckInit(1, &cdrom) ) { | |
| 339 return; | |
| 340 } | |
| 341 SDL_CDcaps.Close(cdrom); | |
| 342 free(cdrom); | |
| 343 default_cdrom = NULL; | |
| 344 } | |
| 345 | |
| 346 void SDL_CDROMQuit(void) | |
| 347 { | |
| 348 SDL_SYS_CDQuit(); | |
| 349 SDL_cdinitted = 0; | |
| 350 } |