Mercurial > sdl-ios-xcode
view src/video/Xext/Xv/Xvlibint.h @ 689:5bb080d35049
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).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 22 Aug 2003 05:51:19 +0000 |
parents | eadc0746dfaf |
children | 045f186426e1 |
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/*********************************************************** Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts, and the Massachusetts Institute of Technology, Cambridge, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Digital or MIT not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* $XFree86: xc/lib/Xv/Xvlibint.h,v 1.5 2001/07/25 15:04:53 dawes Exp $ */ #ifndef XVLIBINT_H #define XVLIBINT_H /* ** File: ** ** Xvlibint.h --- Xv library internal header file ** ** Author: ** ** David Carver (Digital Workstation Engineering/Project Athena) ** ** Revisions: ** ** 01.24.91 Carver ** - version 1.4 upgrade ** */ #define NEED_REPLIES #include <X11/Xlibint.h> #include "Xvproto.h" #include "Xvlib.h" #if !defined(UNIXCPP) #define XvGetReq(name, req) \ WORD64ALIGN\ if ((dpy->bufptr + SIZEOF(xv##name##Req)) > dpy->bufmax)\ _XFlush(dpy);\ req = (xv##name##Req *)(dpy->last_req = dpy->bufptr);\ req->reqType = info->codes->major_opcode;\ req->xvReqType = xv_##name; \ req->length = (SIZEOF(xv##name##Req))>>2;\ dpy->bufptr += SIZEOF(xv##name##Req);\ dpy->request++ #else /* non-ANSI C uses empty comment instead of "##" for token concatenation */ #define XvGetReq(name, req) \ WORD64ALIGN\ if ((dpy->bufptr + SIZEOF(xv/**/name/**/Req)) > dpy->bufmax)\ _XFlush(dpy);\ req = (xv/**/name/**/Req *)(dpy->last_req = dpy->bufptr);\ req->reqType = info->codes->major_opcode;\ req->xvReqType = xv_/**/name;\ req->length = (SIZEOF(xv/**/name/**/Req))>>2;\ dpy->bufptr += SIZEOF(xv/**/name/**/Req);\ dpy->request++ #endif #endif /* XVLIBINT_H */