Date: Tue, 19 Aug 2003 17:57:00 +0200 From: Stephane Marchesin Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection I think everything is correct now. I've done as much testing as I could, but some real-world testing wouldn't hurt, I think. The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch If you do byte-by-byte comparison of the output between C and MMX functions, you'll notice that the results for 555 and 565 RGB alpha blits aren't exactly the same. This is because MMX functions for 555 and 565 RGB have an higher accuracy. If you want the exact same behaviour that's possible by masking the three lower alpha bits in the MMX functions. Just ask ! I removed one MMX function because after I fixed it to match its C equivalent, it revealed to be slower than the C version on a PIII (although a bit faster on an Athlon XP). I've also added MMX and PIII replacements for SDL_memcpy. Those provide some speed up in testvidinfo -benchmark (at least for me, under linux & X11).

.TH "SDL_mutexP" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_mutexP\- Lock a mutex
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
#include "SDL_thread\&.h"
.sp
\fBint \fBSDL_mutexP\fP\fR(\fBSDL_mutex *mutex\fR);
.SH "DESCRIPTION"
.PP
Locks the \fBmutex\fR, which was previously created with \fI\fBSDL_CreateMutex\fP\fR\&. If the mutex is already locked then \fBSDL_mutexP\fP will not return until it is \fIunlocked\fR\&. Returns \fB0\fR on success, or \fB-1\fR on an error\&.
.PP
SDL also defines a macro \fB#define SDL_LockMutex(m) SDL_mutexP(m)\fP\&.
.SH "SEE ALSO"
.PP
\fI\fBSDL_CreateMutex\fP\fR, \fI\fBSDL_mutexV\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01