Mercurial > sdl-ios-xcode
view src/video/Xext/extensions/xf86dga1.h @ 1542:a8bf1aa21020
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 | 585a7e1285ae |
children | 782fd950bd46 c121d94672cb |
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/* $XFree86: xc/include/extensions/xf86dga1.h,v 1.2 1999/04/17 07:05:41 dawes Exp $ */ /* Copyright (c) 1995 Jon Tombs Copyright (c) 1995 XFree86 Inc */ /************************************************************************ THIS IS THE OLD DGA API AND IS OBSOLETE. PLEASE DO NOT USE IT ANYMORE ************************************************************************/ #ifndef _XF86DGA1_H_ #define _XF86DGA1_H_ #include <X11/Xfuncproto.h> #include "SDL_name.h" #define X_XF86DGAQueryVersion 0 #define X_XF86DGAGetVideoLL 1 #define X_XF86DGADirectVideo 2 #define X_XF86DGAGetViewPortSize 3 #define X_XF86DGASetViewPort 4 #define X_XF86DGAGetVidPage 5 #define X_XF86DGASetVidPage 6 #define X_XF86DGAInstallColormap 7 #define X_XF86DGAQueryDirectVideo 8 #define X_XF86DGAViewPortChanged 9 #define XF86DGADirectPresent 0x0001 #define XF86DGADirectGraphics 0x0002 #define XF86DGADirectMouse 0x0004 #define XF86DGADirectKeyb 0x0008 #define XF86DGAHasColormap 0x0100 #define XF86DGADirectColormap 0x0200 #ifndef _XF86DGA_SERVER_ _XFUNCPROTOBEGIN Bool SDL_NAME(XF86DGAQueryVersion)( #if NeedFunctionPrototypes Display* /* dpy */, int* /* majorVersion */, int* /* minorVersion */ #endif ); Bool SDL_NAME(XF86DGAQueryExtension)( #if NeedFunctionPrototypes Display* /* dpy */, int* /* event_base */, int* /* error_base */ #endif ); Status SDL_NAME(XF86DGAGetVideoLL)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int * /* base addr */, int * /* width */, int * /* bank_size */, int * /* ram_size */ #endif ); Status SDL_NAME(XF86DGAGetVideo)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, char ** /* base addr */, int * /* width */, int * /* bank_size */, int * /* ram_size */ #endif ); Status SDL_NAME(XF86DGADirectVideo)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int /* enable */ #endif ); Status SDL_NAME(XF86DGADirectVideoLL)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int /* enable */ #endif ); Status SDL_NAME(XF86DGAGetViewPortSize)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int * /* width */, int * /* height */ #endif ); Status SDL_NAME(XF86DGASetViewPort)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int x /* X */, int y /* Y */ #endif ); Status SDL_NAME(XF86DGAGetVidPage)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int * /* vid page */ #endif ); Status SDL_NAME(XF86DGASetVidPage)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, int /* vid page */ #endif ); Status SDL_NAME(XF86DGAInstallColormap)( #if NeedFunctionPrototypes Display* /* dpy */, int /* screen */, Colormap /*Colormap */ #endif ); int SDL_NAME(XF86DGAForkApp)( #if NeedFunctionPrototypes int screen #endif ); Status SDL_NAME(XF86DGAQueryDirectVideo)( #if NeedFunctionPrototypes Display * /* dpy */, int /* screen */, int * /* flags */ #endif ); Bool SDL_NAME(XF86DGAViewPortChanged)( #if NeedFunctionPrototypes Display * /* dpy */, int /* screen */, int /* n */ #endif ); _XFUNCPROTOEND #endif /* _XF86DGA_SERVER_ */ #endif /* _XF86DGA1_H_ */