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Fixed bug #15 SDL_blit_A.mmx-speed.patch.txt -- Speed improvements and a bugfix for the current GCC inline mmx asm code: - Changed some ops and removed some resulting useless ones. - Added some instruction parallelism (some gain) The resulting speed on my Xeon improved upto 35% depending on the function (measured in fps). - Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was setting the alpha component on the destination surfaces (to opaque-alpha) even when the surface had none. SDL_blit_A.mmx-msvc.patch.txt -- MSVC mmx intrinsics version of the same GCC asm code. MSVC compiler tries to parallelize the code and to avoid register stalls, but does not always do a very good job. Per-surface blending MSVC functions run quite a bit faster than their pure-asm counterparts (upto 55% faster for 16bit ones), but the per-pixel blending runs somewhat slower than asm. - BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all variants) can now also handle formats other than (A)RGB8888. Formats like RGBA8888 and some quite exotic ones are allowed -- like RAGB8888, or actually anything having channels aligned on 8bit boundary and full 8bit alpha (for per-pixel alpha blending). The performance cost of this change is virtually 0 for per-surface alpha blending (no extra ops inside the loop) and a single non-MMX op inside the loop for per-pixel blending. In testing, the per-pixel alpha blending takes a ~2% performance hit, but it still runs much faster than the current code in CVS. If necessary, a separate function with this functionality can be made. This code requires Processor Pack for VC6.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:39:29 +0000
parents 355632dca928
children
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<HTML
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><TITLE
>SDL_ResizeEvent</TITLE
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><H1
><A
NAME="SDLRESIZEEVENT"
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>SDL_ResizeEvent</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4453"
></A
><H2
>Name</H2
>SDL_ResizeEvent&nbsp;--&nbsp;Window resize event structure</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4456"
></A
><H2
>Structure Definition</H2
><PRE
CLASS="PROGRAMLISTING"
>typedef struct{
  Uint8 type;
  int w, h;
} SDL_ResizeEvent;</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4459"
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><H2
>Structure Data</H2
><DIV
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><P
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><TABLE
BORDER="0"
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><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>type</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_VIDEORESIZE</TT
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>w</I
></TT
>, <TT
CLASS="STRUCTFIELD"
><I
>h</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>New width and height of the window</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
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></A
><H2
>Description</H2
><P
><SPAN
CLASS="STRUCTNAME"
>SDL_ResizeEvent</SPAN
> is a member of the <A
HREF="sdlevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_Event</SPAN
></A
> union and is used when an event of type <TT
CLASS="LITERAL"
>SDL_VIDEORESIZE</TT
> is reported.</P
><P
>When <TT
CLASS="LITERAL"
>SDL_RESIZABLE</TT
> is passed as a <TT
CLASS="PARAMETER"
><I
>flag</I
></TT
> to <A
HREF="sdlsetvideomode.html"
><TT
CLASS="FUNCTION"
>SDL_SetVideoMode</TT
></A
> the user is allowed to resize the applications window. When the window is resized an <TT
CLASS="LITERAL"
>SDL_VIDEORESIZE</TT
> is report, with the new window width and height values stored in <TT
CLASS="STRUCTFIELD"
><I
>w</I
></TT
> and <TT
CLASS="STRUCTFIELD"
><I
>h</I
></TT
>, respectively. When an <TT
CLASS="LITERAL"
>SDL_VIDEORESIZE</TT
> is recieved the window should be resized to the new dimensions using <A
HREF="sdlsetvideomode.html"
><TT
CLASS="FUNCTION"
>SDL_SetVideoMode</TT
></A
>.</P
></DIV
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><H2
>See Also</H2
><P
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><SPAN
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>SDL_Event</SPAN
></A
>,
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>SDL_SetVideoMode</TT
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