Mercurial > sdl-ios-xcode
annotate docs/html/sdlvideoinfo.html @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_VideoInfo</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Video" | |
| 14 HREF="video.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_Surface" | |
| 17 HREF="sdlsurface.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_Overlay" | |
| 20 HREF="sdloverlay.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdlsurface.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdloverlay.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLVIDEOINFO" | |
| 71 >SDL_VideoInfo</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN3006" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_VideoInfo -- Video Target information</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
|
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84 NAME="AEN3009" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Structure Definition</H2 | |
| 88 ><PRE | |
| 89 CLASS="PROGRAMLISTING" | |
| 90 >typedef struct{ | |
| 91 Uint32 hw_available:1; | |
| 92 Uint32 wm_available:1; | |
| 93 Uint32 blit_hw:1; | |
| 94 Uint32 blit_hw_CC:1; | |
| 95 Uint32 blit_hw_A:1; | |
| 96 Uint32 blit_sw:1; | |
| 97 Uint32 blit_sw_CC:1; | |
| 98 Uint32 blit_sw_A:1; | |
| 99 Uint32 blit_fill; | |
| 100 Uint32 video_mem; | |
| 101 SDL_PixelFormat *vfmt; | |
| 102 } SDL_VideoInfo;</PRE | |
| 103 ></DIV | |
| 104 ><DIV | |
| 105 CLASS="REFSECT1" | |
| 106 ><A | |
|
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107 NAME="AEN3012" |
| 0 | 108 ></A |
| 109 ><H2 | |
| 110 >Structure Data</H2 | |
| 111 ><DIV | |
| 112 CLASS="INFORMALTABLE" | |
| 113 ><A | |
|
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114 NAME="AEN3014" |
| 0 | 115 ></A |
| 116 ><P | |
| 117 ></P | |
| 118 ><TABLE | |
| 119 BORDER="0" | |
| 120 CLASS="CALSTABLE" | |
| 121 ><TBODY | |
| 122 ><TR | |
| 123 ><TD | |
| 124 ALIGN="LEFT" | |
| 125 VALIGN="TOP" | |
| 126 ><TT | |
| 127 CLASS="STRUCTFIELD" | |
| 128 ><I | |
| 129 >hw_available</I | |
| 130 ></TT | |
| 131 ></TD | |
| 132 ><TD | |
| 133 ALIGN="LEFT" | |
| 134 VALIGN="TOP" | |
| 135 >Is it possible to create hardware surfaces?</TD | |
| 136 ></TR | |
| 137 ><TR | |
| 138 ><TD | |
| 139 ALIGN="LEFT" | |
| 140 VALIGN="TOP" | |
| 141 ><TT | |
| 142 CLASS="STRUCTFIELD" | |
| 143 ><I | |
| 144 >wm_available</I | |
| 145 ></TT | |
| 146 ></TD | |
| 147 ><TD | |
| 148 ALIGN="LEFT" | |
| 149 VALIGN="TOP" | |
| 150 >Is there a window manager available</TD | |
| 151 ></TR | |
| 152 ><TR | |
| 153 ><TD | |
| 154 ALIGN="LEFT" | |
| 155 VALIGN="TOP" | |
| 156 ><TT | |
| 157 CLASS="STRUCTFIELD" | |
| 158 ><I | |
| 159 >blit_hw</I | |
| 160 ></TT | |
| 161 ></TD | |
| 162 ><TD | |
| 163 ALIGN="LEFT" | |
| 164 VALIGN="TOP" | |
| 165 >Are hardware to hardware blits accelerated?</TD | |
| 166 ></TR | |
| 167 ><TR | |
| 168 ><TD | |
| 169 ALIGN="LEFT" | |
| 170 VALIGN="TOP" | |
| 171 ><TT | |
| 172 CLASS="STRUCTFIELD" | |
| 173 ><I | |
| 174 >blit_hw_CC</I | |
| 175 ></TT | |
| 176 ></TD | |
| 177 ><TD | |
| 178 ALIGN="LEFT" | |
| 179 VALIGN="TOP" | |
| 180 >Are hardware to hardware colorkey blits accelerated?</TD | |
| 181 ></TR | |
| 182 ><TR | |
| 183 ><TD | |
| 184 ALIGN="LEFT" | |
| 185 VALIGN="TOP" | |
| 186 ><TT | |
| 187 CLASS="STRUCTFIELD" | |
| 188 ><I | |
| 189 >blit_hw_A</I | |
| 190 ></TT | |
| 191 ></TD | |
| 192 ><TD | |
| 193 ALIGN="LEFT" | |
| 194 VALIGN="TOP" | |
| 195 >Are hardware to hardware alpha blits accelerated?</TD | |
| 196 ></TR | |
| 197 ><TR | |
| 198 ><TD | |
| 199 ALIGN="LEFT" | |
| 200 VALIGN="TOP" | |
| 201 ><TT | |
| 202 CLASS="STRUCTFIELD" | |
| 203 ><I | |
| 204 >blit_sw</I | |
| 205 ></TT | |
| 206 ></TD | |
| 207 ><TD | |
| 208 ALIGN="LEFT" | |
| 209 VALIGN="TOP" | |
| 210 >Are software to hardware blits accelerated?</TD | |
| 211 ></TR | |
| 212 ><TR | |
| 213 ><TD | |
| 214 ALIGN="LEFT" | |
| 215 VALIGN="TOP" | |
| 216 ><TT | |
| 217 CLASS="STRUCTFIELD" | |
| 218 ><I | |
| 219 >blit_sw_CC</I | |
| 220 ></TT | |
| 221 ></TD | |
| 222 ><TD | |
| 223 ALIGN="LEFT" | |
| 224 VALIGN="TOP" | |
| 225 >Are software to hardware colorkey blits accelerated?</TD | |
| 226 ></TR | |
| 227 ><TR | |
| 228 ><TD | |
| 229 ALIGN="LEFT" | |
| 230 VALIGN="TOP" | |
| 231 ><TT | |
| 232 CLASS="STRUCTFIELD" | |
| 233 ><I | |
| 234 >blit_sw_A</I | |
| 235 ></TT | |
| 236 ></TD | |
| 237 ><TD | |
| 238 ALIGN="LEFT" | |
| 239 VALIGN="TOP" | |
| 240 >Are software to hardware alpha blits accelerated?</TD | |
| 241 ></TR | |
| 242 ><TR | |
| 243 ><TD | |
| 244 ALIGN="LEFT" | |
| 245 VALIGN="TOP" | |
| 246 ><TT | |
| 247 CLASS="STRUCTFIELD" | |
| 248 ><I | |
| 249 >blit_fill</I | |
| 250 ></TT | |
| 251 ></TD | |
| 252 ><TD | |
| 253 ALIGN="LEFT" | |
| 254 VALIGN="TOP" | |
| 255 >Are color fills accelerated?</TD | |
| 256 ></TR | |
| 257 ><TR | |
| 258 ><TD | |
| 259 ALIGN="LEFT" | |
| 260 VALIGN="TOP" | |
| 261 ><TT | |
| 262 CLASS="STRUCTFIELD" | |
| 263 ><I | |
| 264 >video_mem</I | |
| 265 ></TT | |
| 266 ></TD | |
| 267 ><TD | |
| 268 ALIGN="LEFT" | |
| 269 VALIGN="TOP" | |
| 270 >Total amount of video memory in Kilobytes</TD | |
| 271 ></TR | |
| 272 ><TR | |
| 273 ><TD | |
| 274 ALIGN="LEFT" | |
| 275 VALIGN="TOP" | |
| 276 ><TT | |
| 277 CLASS="STRUCTFIELD" | |
| 278 ><I | |
| 279 >vfmt</I | |
| 280 ></TT | |
| 281 ></TD | |
| 282 ><TD | |
| 283 ALIGN="LEFT" | |
| 284 VALIGN="TOP" | |
| 285 ><A | |
| 286 HREF="sdlpixelformat.html" | |
| 287 >Pixel format</A | |
| 288 > of the video device</TD | |
| 289 ></TR | |
| 290 ></TBODY | |
| 291 ></TABLE | |
| 292 ><P | |
| 293 ></P | |
| 294 ></DIV | |
| 295 ></DIV | |
| 296 ><DIV | |
| 297 CLASS="REFSECT1" | |
| 298 ><A | |
|
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299 NAME="AEN3062" |
| 0 | 300 ></A |
| 301 ><H2 | |
| 302 >Description</H2 | |
| 303 ><P | |
| 304 >This (read-only) structure is returned by <A | |
| 305 HREF="sdlgetvideoinfo.html" | |
| 306 ><TT | |
| 307 CLASS="FUNCTION" | |
| 308 >SDL_GetVideoInfo</TT | |
| 309 ></A | |
| 310 >. It contains information on either the 'best' available mode (if called before <A | |
| 311 HREF="sdlsetvideomode.html" | |
| 312 ><TT | |
| 313 CLASS="FUNCTION" | |
| 314 >SDL_SetVideoMode</TT | |
| 315 ></A | |
| 316 >) or the current video mode.</P | |
| 317 ></DIV | |
| 318 ><DIV | |
| 319 CLASS="REFSECT1" | |
| 320 ><A | |
|
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321 NAME="AEN3069" |
| 0 | 322 ></A |
| 323 ><H2 | |
| 324 >See Also</H2 | |
| 325 ><P | |
| 326 ><A | |
| 327 HREF="sdlpixelformat.html" | |
| 328 ><SPAN | |
| 329 CLASS="STRUCTNAME" | |
| 330 >SDL_PixelFormat</SPAN | |
| 331 ></A | |
| 332 >, | |
| 333 <A | |
| 334 HREF="sdlgetvideoinfo.html" | |
| 335 ><TT | |
| 336 CLASS="FUNCTION" | |
| 337 >SDL_GetVideoInfo</TT | |
| 338 ></A | |
| 339 ></P | |
| 340 ></DIV | |
| 341 ><DIV | |
| 342 CLASS="NAVFOOTER" | |
| 343 ><HR | |
| 344 ALIGN="LEFT" | |
| 345 WIDTH="100%"><TABLE | |
| 346 WIDTH="100%" | |
| 347 BORDER="0" | |
| 348 CELLPADDING="0" | |
| 349 CELLSPACING="0" | |
| 350 ><TR | |
| 351 ><TD | |
| 352 WIDTH="33%" | |
| 353 ALIGN="left" | |
| 354 VALIGN="top" | |
| 355 ><A | |
| 356 HREF="sdlsurface.html" | |
| 357 >Prev</A | |
| 358 ></TD | |
| 359 ><TD | |
| 360 WIDTH="34%" | |
| 361 ALIGN="center" | |
| 362 VALIGN="top" | |
| 363 ><A | |
| 364 HREF="index.html" | |
| 365 >Home</A | |
| 366 ></TD | |
| 367 ><TD | |
| 368 WIDTH="33%" | |
| 369 ALIGN="right" | |
| 370 VALIGN="top" | |
| 371 ><A | |
| 372 HREF="sdloverlay.html" | |
| 373 >Next</A | |
| 374 ></TD | |
| 375 ></TR | |
| 376 ><TR | |
| 377 ><TD | |
| 378 WIDTH="33%" | |
| 379 ALIGN="left" | |
| 380 VALIGN="top" | |
| 381 >SDL_Surface</TD | |
| 382 ><TD | |
| 383 WIDTH="34%" | |
| 384 ALIGN="center" | |
| 385 VALIGN="top" | |
| 386 ><A | |
| 387 HREF="video.html" | |
| 388 >Up</A | |
| 389 ></TD | |
| 390 ><TD | |
| 391 WIDTH="33%" | |
| 392 ALIGN="right" | |
| 393 VALIGN="top" | |
| 394 >SDL_Overlay</TD | |
| 395 ></TR | |
| 396 ></TABLE | |
| 397 ></DIV | |
| 398 ></BODY | |
| 399 ></HTML | |
| 400 > |