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It turns out both the software and the OpenGL renderer had the same problem. According to the spec, when SDL_SRCALPHA is set, the colorkey is ignored, so we just need to convert the colorkey into the alpha channel.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 25 Nov 2008 05:29:14 +0000
parents 355632dca928
children
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<HTML
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><TITLE
>SDL_Delay</TITLE
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><H1
><A
NAME="SDLDELAY"
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>SDL_Delay</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN8455"
></A
><H2
>Name</H2
>SDL_Delay&nbsp;--&nbsp;Wait a specified number of milliseconds before returning.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN8458"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
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NAME="AEN8459"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_Delay</B
></CODE
>(Uint32 ms);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN8465"
></A
><H2
>Description</H2
><P
>Wait a specified number of milliseconds before returning. <TT
CLASS="FUNCTION"
>SDL_Delay</TT
> will wait at <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>least</I
></SPAN
> the specified time, but possible longer due to OS scheduling.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Count on a delay granularity of <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>at least</I
></SPAN
> 10 ms.
Some platforms have shorter clock ticks but this is the most common.</P
></BLOCKQUOTE
></DIV
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><A
NAME="AEN8473"
></A
><H2
>See Also</H2
><P
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><TT
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>SDL_AddTimer</TT
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