Mercurial > sdl-ios-xcode
annotate docs/html/sdlglloadlibrary.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 |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_GL_LoadLibrary</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="Video" | |
| 14 HREF="video.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_ShowCursor" | |
| 17 HREF="sdlshowcursor.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GL_GetProcAddress" | |
| 20 HREF="sdlglgetprocaddress.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="sdlshowcursor.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="sdlglgetprocaddress.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="SDLGLLOADLIBRARY" | |
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74 ></A |
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75 >SDL_GL_LoadLibrary</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2648" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_GL_LoadLibrary -- Specify an OpenGL library</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2651" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2652" |
| 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 >int <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_GL_LoadLibrary</B | |
| 108 ></CODE | |
| 109 >(const char *path);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2658" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >If you wish, you may load the OpenGL library at runtime, this must be done before <A | |
| 124 HREF="sdlsetvideomode.html" | |
| 125 ><TT | |
| 126 CLASS="FUNCTION" | |
| 127 >SDL_SetVideoMode</TT | |
| 128 ></A | |
| 129 > is called. The <TT | |
| 130 CLASS="PARAMETER" | |
| 131 ><I | |
| 132 >path</I | |
| 133 ></TT | |
| 134 > of the GL library is passed to <TT | |
| 135 CLASS="FUNCTION" | |
| 136 >SDL_GL_LoadLibrary</TT | |
| 137 > and it returns <SPAN | |
| 138 CLASS="RETURNVALUE" | |
| 139 >0</SPAN | |
| 140 > on success, or <SPAN | |
| 141 CLASS="RETURNVALUE" | |
| 142 >-1</SPAN | |
| 143 > on an error. You must then use <A | |
| 144 HREF="sdlglgetprocaddress.html" | |
| 145 ><TT | |
| 146 CLASS="FUNCTION" | |
| 147 >SDL_GL_GetProcAddress</TT | |
| 148 ></A | |
| 149 > to retrieve function pointers to GL functions.</P | |
| 150 ></DIV | |
| 151 ><DIV | |
| 152 CLASS="REFSECT1" | |
| 153 ><A | |
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154 NAME="AEN2669" |
| 0 | 155 ></A |
| 156 ><H2 | |
| 157 >See Also</H2 | |
| 158 ><P | |
| 159 ><A | |
| 160 HREF="sdlglgetprocaddress.html" | |
| 161 ><TT | |
| 162 CLASS="FUNCTION" | |
| 163 >SDL_GL_GetProcAddress</TT | |
| 164 ></A | |
| 165 ></P | |
| 166 ></DIV | |
| 167 ><DIV | |
| 168 CLASS="NAVFOOTER" | |
| 169 ><HR | |
| 170 ALIGN="LEFT" | |
| 171 WIDTH="100%"><TABLE | |
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172 SUMMARY="Footer navigation table" |
| 0 | 173 WIDTH="100%" |
| 174 BORDER="0" | |
| 175 CELLPADDING="0" | |
| 176 CELLSPACING="0" | |
| 177 ><TR | |
| 178 ><TD | |
| 179 WIDTH="33%" | |
| 180 ALIGN="left" | |
| 181 VALIGN="top" | |
| 182 ><A | |
| 183 HREF="sdlshowcursor.html" | |
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184 ACCESSKEY="P" |
| 0 | 185 >Prev</A |
| 186 ></TD | |
| 187 ><TD | |
| 188 WIDTH="34%" | |
| 189 ALIGN="center" | |
| 190 VALIGN="top" | |
| 191 ><A | |
| 192 HREF="index.html" | |
|
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parents:
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193 ACCESSKEY="H" |
| 0 | 194 >Home</A |
| 195 ></TD | |
| 196 ><TD | |
| 197 WIDTH="33%" | |
| 198 ALIGN="right" | |
| 199 VALIGN="top" | |
| 200 ><A | |
| 201 HREF="sdlglgetprocaddress.html" | |
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355632dca928
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Sam Lantinga <slouken@libsdl.org>
parents:
181
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changeset
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202 ACCESSKEY="N" |
| 0 | 203 >Next</A |
| 204 ></TD | |
| 205 ></TR | |
| 206 ><TR | |
| 207 ><TD | |
| 208 WIDTH="33%" | |
| 209 ALIGN="left" | |
| 210 VALIGN="top" | |
| 211 >SDL_ShowCursor</TD | |
| 212 ><TD | |
| 213 WIDTH="34%" | |
| 214 ALIGN="center" | |
| 215 VALIGN="top" | |
| 216 ><A | |
| 217 HREF="video.html" | |
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parents:
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218 ACCESSKEY="U" |
| 0 | 219 >Up</A |
| 220 ></TD | |
| 221 ><TD | |
| 222 WIDTH="33%" | |
| 223 ALIGN="right" | |
| 224 VALIGN="top" | |
| 225 >SDL_GL_GetProcAddress</TD | |
| 226 ></TR | |
| 227 ></TABLE | |
| 228 ></DIV | |
| 229 ></BODY | |
| 230 ></HTML | |
| 231 > |