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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_GetModState</TITLE
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><H1
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>SDL_GetModState</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5721"
></A
><H2
>Name</H2
>SDL_GetModState&nbsp;--&nbsp;Get the state of modifier keys.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN5724"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN5725"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>SDLMod <B
CLASS="FSFUNC"
>SDL_GetModState</B
></CODE
>(void);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5731"
></A
><H2
>Description</H2
><P
>Returns the current state of the modifier keys (CTRL, ALT, etc.).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5734"
></A
><H2
>Return Value</H2
><P
>The return value can be an OR'd combination of the SDLMod enum.</P
><P
><A
NAME="AEN5738"
></A
><BLOCKQUOTE
CLASS="BLOCKQUOTE"
><P
><B
>SDLMod</B
></P
><PRE
CLASS="PROGRAMLISTING"
>typedef enum {
  KMOD_NONE  = 0x0000,
  KMOD_LSHIFT= 0x0001,
  KMOD_RSHIFT= 0x0002,
  KMOD_LCTRL = 0x0040,
  KMOD_RCTRL = 0x0080,
  KMOD_LALT  = 0x0100,
  KMOD_RALT  = 0x0200,
  KMOD_LMETA = 0x0400,
  KMOD_RMETA = 0x0800,
  KMOD_NUM   = 0x1000,
  KMOD_CAPS  = 0x2000,
  KMOD_MODE  = 0x4000,
} SDLMod;</PRE
></BLOCKQUOTE
>
SDL also defines the following symbols for convenience:
<A
NAME="AEN5741"
></A
><BLOCKQUOTE
CLASS="BLOCKQUOTE"
><PRE
CLASS="PROGRAMLISTING"
>#define KMOD_CTRL (KMOD_LCTRL|KMOD_RCTRL)
#define KMOD_SHIFT  (KMOD_LSHIFT|KMOD_RSHIFT)
#define KMOD_ALT  (KMOD_LALT|KMOD_RALT)
#define KMOD_META (KMOD_LMETA|KMOD_RMETA)</PRE
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><H2
>See Also</H2
><P
><A
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><TT
CLASS="FUNCTION"
>SDL_GetKeyState</TT
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