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Date: Wed, 4 Mar 2009 15:38:22 +0200 From: "Mike Gorchak" Subject: Re: About QNX support in SDL 1.3 Here is another batch of patches. 1) Makefile.in - added SDL_opengles.h header as header to install. 2) configure.in - Added special define to detect Common Lite OpenGL ES library in case if Common library is not installed. Added check for clock_gettime in libc (in QNX it is in libc). 3) SDL_config.h.in - Added SDL_VIDEO_RENDER_OPENGL_ES and SDL_VIDEO_OPENGL_ES declarations for configure script autodetection. 4) SDL_opengles.h - Added GL_API definition if it is not defined. Added extension GL_OES_draw_texture because OpenGL ES Renderer uses it without declaration. Added GL_OES_vertex_buffer_object extension, which is supported under QNX OpenGL ES. Added GL_OES_single_precision extension. 5) To the test directory I've added building OpenGL ES test applications through the autotools suite. Was support for iPhone IDE building only.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 04 Mar 2009 15:10:47 +0000
parents 355632dca928
children
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>SDL_MixAudio</TITLE
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><H1
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>SDL_MixAudio</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN7107"
></A
><H2
>Name</H2
>SDL_MixAudio&nbsp;--&nbsp;Mix audio data</DIV
><DIV
CLASS="REFSYNOPSISDIV"
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></A
><H2
>Synopsis</H2
><DIV
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><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_MixAudio</B
></CODE
>(Uint8 *dst, Uint8 *src, Uint32 len, int volume);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7117"
></A
><H2
>Description</H2
><P
>This function takes two audio buffers of <TT
CLASS="PARAMETER"
><I
>len</I
></TT
> bytes each
of the playing audio format and mixes them, performing addition, volume
adjustment, and overflow clipping. The <TT
CLASS="PARAMETER"
><I
>volume</I
></TT
> ranges
from 0 to <TT
CLASS="LITERAL"
>SDL_MIX_MAXVOLUME</TT
> and should be set to the maximum
value for full audio volume. Note this does not change hardware volume. This is
provided for convenience -- you can mix your own audio data.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Do not use this function for mixing together more than two streams of sample
data. The output from repeated application of this function may be distorted
by clipping, because there is no accumulator with greater range than the
input (not to mention this being an inefficient way of doing it).
Use mixing functions from SDL_mixer, OpenAL, or write your own mixer instead.</P
></BLOCKQUOTE
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><A
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></A
><H2
>See Also</H2
><P
><A
HREF="sdlopenaudio.html"
><TT
CLASS="FUNCTION"
>SDL_OpenAudio</TT
></A
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