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.

/* win_ce_semaphore.h - header file to go with win_ce_semaphore.c */

typedef struct _SYNCH_HANDLE_STRUCTURE {
   HANDLE hEvent;
   HANDLE hMutex;
   HANDLE hSemph;
   LONG MaxCount;
   volatile LONG CurCount;
   LPCTSTR lpName;
} SYNCH_HANDLE_STRUCTURE, *SYNCHHANDLE;

#define SYNCH_HANDLE_SIZE sizeof (SYNCH_HANDLE_STRUCTURE)

        /* Error codes - all must have bit 29 set */
#define SYNCH_ERROR 0X20000000   /* EXERCISE - REFINE THE ERROR NUMBERS */

extern SYNCHHANDLE CreateSemaphoreCE (LPSECURITY_ATTRIBUTES, LONG, LONG, LPCTSTR);

extern BOOL ReleaseSemaphoreCE (SYNCHHANDLE, LONG, LPLONG);
extern DWORD WaitForSemaphoreCE (SYNCHHANDLE, DWORD);

extern BOOL CloseSynchHandle (SYNCHHANDLE);