Mercurial > sdl-ios-xcode
view include/SDL_main.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 | 3c45c578d480 |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #ifndef _SDL_main_h #define _SDL_main_h #include "SDL_stdinc.h" /* Redefine main() on Win32 and MacOS so that it is called by winmain.c */ #if defined(__WIN32__) || \ (defined(__MWERKS__) && !defined(__BEOS__)) || \ defined(__MACOS__) || defined(__MACOSX__) || \ defined(__SYMBIAN32__) || defined(QWS) #ifdef __cplusplus #define C_LINKAGE "C" #else #define C_LINKAGE #endif /* __cplusplus */ /* The application's main() function must be called with C linkage, and should be declared like this: #ifdef __cplusplus extern "C" #endif int main(int argc, char *argv[]) { } */ #define main SDL_main /* The prototype for the application's main() function */ extern C_LINKAGE int SDL_main(int argc, char *argv[]); /* From the SDL library code -- needed for registering the app on Win32 */ #ifdef __WIN32__ #include "begin_code.h" #ifdef __cplusplus extern "C" { #endif /* This should be called from your WinMain() function, if any */ extern DECLSPEC void SDLCALL SDL_SetModuleHandle(void *hInst); /* This can also be called, but is no longer necessary */ extern DECLSPEC int SDLCALL SDL_RegisterApp(char *name, Uint32 style, void *hInst); /* This can also be called, but is no longer necessary (SDL_Quit calls it) */ extern DECLSPEC void SDLCALL SDL_UnregisterApp(void); #ifdef __cplusplus } #endif #include "close_code.h" #endif /* From the SDL library code -- needed for registering QuickDraw on MacOS */ #if defined(__MACOS__) #include "begin_code.h" #ifdef __cplusplus extern "C" { #endif /* Forward declaration so we don't need to include QuickDraw.h */ struct QDGlobals; /* This should be called from your main() function, if any */ extern DECLSPEC void SDLCALL SDL_InitQuickDraw(struct QDGlobals *the_qd); #ifdef __cplusplus } #endif #include "close_code.h" #endif #endif /* Need to redefine main()? */ #endif /* _SDL_main_h */