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.

#!/usr/bin/perl
#
# Program to take a set of header files and generate DLL export definitions

# Special exports to ignore for this platform

while ( ($file = shift(@ARGV)) ) {
	if ( ! defined(open(FILE, $file)) ) {
		warn "Couldn't open $file: $!\n";
		next;
	}
	$file =~ s,.*/,,;
	while (<FILE>) {
		if ( / DECLSPEC.* SDLCALL ([^\s\(]+)/ ) {
			if ( not $exclude{$1} ) {
				print "\t_$1\n";
			}
		}
	}
	close(FILE);
}

# Special exports to include for this platform
print "\t_SDL_strrev\n";
print "\t_SDL_strupr\n";
print "\t_SDL_strlwr\n";
print "\t_SDL_ltoa\n";
print "\t_SDL_ultoa\n";
print "\t_SDL_lltoa\n";
print "\t_SDL_ulltoa\n";
print "\t_SDL_iconv\n";
print "\t_SDL_iconv_string\n";
print "\t.objc_class_name_SDL_QuartzWindow\n";
print "\t.objc_class_name_SDL_QuartzWindowDelegate\n";