Mercurial > sdl-ios-xcode
annotate docs/html/sdleventstate.html @ 2042:3908e1f808e1
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:56:36 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_EventState</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Event Functions." | |
| 14 HREF="eventfunctions.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_GetEventFilter" | |
| 17 HREF="sdlgeteventfilter.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetKeyState" | |
| 20 HREF="sdlgetkeystate.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 | |
|
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31 SUMMARY="Header navigation table" |
| 0 | 32 WIDTH="100%" |
| 33 BORDER="0" | |
| 34 CELLPADDING="0" | |
| 35 CELLSPACING="0" | |
| 36 ><TR | |
| 37 ><TH | |
| 38 COLSPAN="3" | |
| 39 ALIGN="center" | |
| 40 >SDL Library Documentation</TH | |
| 41 ></TR | |
| 42 ><TR | |
| 43 ><TD | |
| 44 WIDTH="10%" | |
| 45 ALIGN="left" | |
| 46 VALIGN="bottom" | |
| 47 ><A | |
| 48 HREF="sdlgeteventfilter.html" | |
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlgetkeystate.html" | |
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63 ACCESSKEY="N" |
| 0 | 64 >Next</A |
| 65 ></TD | |
| 66 ></TR | |
| 67 ></TABLE | |
| 68 ><HR | |
| 69 ALIGN="LEFT" | |
| 70 WIDTH="100%"></DIV | |
| 71 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLEVENTSTATE" | |
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74 ></A |
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75 >SDL_EventState</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN5646" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_EventState -- This function allows you to set the state of processing certain events.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN5649" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN5650" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h"</PRE | |
| 101 ><P | |
| 102 ><CODE | |
| 103 ><CODE | |
| 104 CLASS="FUNCDEF" | |
| 105 >Uint8 <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_EventState</B | |
| 108 ></CODE | |
| 109 >(Uint8 type, int state);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN5656" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >This function allows you to set the state of processing certain event <TT | |
| 124 CLASS="PARAMETER" | |
| 125 ><I | |
| 126 >type</I | |
| 127 ></TT | |
| 128 >'s.</P | |
| 129 ><P | |
| 130 >If <TT | |
| 131 CLASS="PARAMETER" | |
| 132 ><I | |
| 133 >state</I | |
| 134 ></TT | |
| 135 > is set to <TT | |
| 136 CLASS="LITERAL" | |
| 137 >SDL_IGNORE</TT | |
| 138 >, | |
| 139 that event <TT | |
| 140 CLASS="PARAMETER" | |
| 141 ><I | |
| 142 >type</I | |
| 143 ></TT | |
| 144 > will be automatically dropped from the event queue and will | |
| 145 not be filtered.</P | |
| 146 ><P | |
| 147 >If <TT | |
| 148 CLASS="PARAMETER" | |
| 149 ><I | |
| 150 >state</I | |
| 151 ></TT | |
| 152 > is set to <TT | |
| 153 CLASS="LITERAL" | |
| 154 >SDL_ENABLE</TT | |
| 155 >, | |
| 156 that event <TT | |
| 157 CLASS="PARAMETER" | |
| 158 ><I | |
| 159 >type</I | |
| 160 ></TT | |
| 161 > will be processed normally.</P | |
| 162 ><P | |
| 163 >If <TT | |
| 164 CLASS="PARAMETER" | |
| 165 ><I | |
| 166 >state</I | |
| 167 ></TT | |
| 168 > is set to <TT | |
| 169 CLASS="LITERAL" | |
| 170 >SDL_QUERY</TT | |
| 171 >, | |
| 172 <TT | |
| 173 CLASS="FUNCTION" | |
| 174 >SDL_EventState</TT | |
| 175 > will return the current processing | |
| 176 state of the specified event <TT | |
| 177 CLASS="PARAMETER" | |
| 178 ><I | |
| 179 >type</I | |
| 180 ></TT | |
| 181 >.</P | |
| 182 ><P | |
| 183 >A list of event <TT | |
| 184 CLASS="PARAMETER" | |
| 185 ><I | |
| 186 >type</I | |
| 187 ></TT | |
| 188 >'s can be found in the <A | |
| 189 HREF="sdlevent.html" | |
| 190 ><SPAN | |
| 191 CLASS="STRUCTNAME" | |
| 192 >SDL_Event</SPAN | |
| 193 ></A | |
| 194 > section.</P | |
| 195 ></DIV | |
| 196 ><DIV | |
| 197 CLASS="REFSECT1" | |
| 198 ><A | |
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199 NAME="AEN5677" |
| 0 | 200 ></A |
| 201 ><H2 | |
| 202 >See Also</H2 | |
| 203 ><P | |
| 204 ><A | |
| 205 HREF="sdlevent.html" | |
| 206 ><SPAN | |
| 207 CLASS="STRUCTNAME" | |
| 208 >SDL_Event</SPAN | |
| 209 ></A | |
| 210 ></P | |
| 211 ></DIV | |
| 212 ><DIV | |
| 213 CLASS="NAVFOOTER" | |
| 214 ><HR | |
| 215 ALIGN="LEFT" | |
| 216 WIDTH="100%"><TABLE | |
|
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355632dca928
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parents:
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217 SUMMARY="Footer navigation table" |
| 0 | 218 WIDTH="100%" |
| 219 BORDER="0" | |
| 220 CELLPADDING="0" | |
| 221 CELLSPACING="0" | |
| 222 ><TR | |
| 223 ><TD | |
| 224 WIDTH="33%" | |
| 225 ALIGN="left" | |
| 226 VALIGN="top" | |
| 227 ><A | |
| 228 HREF="sdlgeteventfilter.html" | |
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355632dca928
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parents:
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229 ACCESSKEY="P" |
| 0 | 230 >Prev</A |
| 231 ></TD | |
| 232 ><TD | |
| 233 WIDTH="34%" | |
| 234 ALIGN="center" | |
| 235 VALIGN="top" | |
| 236 ><A | |
| 237 HREF="index.html" | |
|
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355632dca928
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parents:
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238 ACCESSKEY="H" |
| 0 | 239 >Home</A |
| 240 ></TD | |
| 241 ><TD | |
| 242 WIDTH="33%" | |
| 243 ALIGN="right" | |
| 244 VALIGN="top" | |
| 245 ><A | |
| 246 HREF="sdlgetkeystate.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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247 ACCESSKEY="N" |
| 0 | 248 >Next</A |
| 249 ></TD | |
| 250 ></TR | |
| 251 ><TR | |
| 252 ><TD | |
| 253 WIDTH="33%" | |
| 254 ALIGN="left" | |
| 255 VALIGN="top" | |
| 256 >SDL_GetEventFilter</TD | |
| 257 ><TD | |
| 258 WIDTH="34%" | |
| 259 ALIGN="center" | |
| 260 VALIGN="top" | |
| 261 ><A | |
| 262 HREF="eventfunctions.html" | |
|
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parents:
181
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263 ACCESSKEY="U" |
| 0 | 264 >Up</A |
| 265 ></TD | |
| 266 ><TD | |
| 267 WIDTH="33%" | |
| 268 ALIGN="right" | |
| 269 VALIGN="top" | |
| 270 >SDL_GetKeyState</TD | |
| 271 ></TR | |
| 272 ></TABLE | |
| 273 ></DIV | |
| 274 ></BODY | |
| 275 ></HTML | |
| 276 > |