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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 a888b3ae31ff
children b8d311d90021
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* Useful functions and variables from SDL_events.c */
#include "SDL_events.h"

/* Start and stop the event processing loop */
extern int SDL_StartEventLoop(Uint32 flags);
extern void SDL_StopEventLoop(void);
extern void SDL_QuitInterrupt(void);

extern void SDL_Lock_EventThread();
extern void SDL_Unlock_EventThread();
extern Uint32 SDL_EventThreadID(void);

/* Event handler init routines */
extern int  SDL_AppActiveInit(void);
extern int  SDL_KeyboardInit(void);
extern int  SDL_MouseInit(void);
extern int  SDL_QuitInit(void);

/* The event filter function */
extern SDL_EventFilter SDL_EventOK;

/* The array of event processing states */
extern Uint8 SDL_ProcessEvents[SDL_NUMEVENTS];

/* Internal event queueing functions
   (from SDL_active.c, SDL_mouse.c, SDL_keyboard.c, SDL_quit.c, SDL_events.c)
 */
extern int SDL_PrivateAppActive(Uint8 gain, Uint8 state);
extern int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative,
						Sint16 x, Sint16 y);
extern int SDL_PrivateMouseButton(Uint8 state, Uint8 button,Sint16 x,Sint16 y);
extern int SDL_PrivateKeyboard(Uint8 state, SDL_keysym *key);
extern int SDL_PrivateResize(int w, int h);
extern int SDL_PrivateExpose(void);
extern int SDL_PrivateQuit(void);
extern int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message);

/* Used by the activity event handler to remove mouse focus */
extern void SDL_ResetMouse(void);

/* Used by the activity event handler to remove keyboard focus */
extern void SDL_ResetKeyboard(void);

/* Used by the event loop to queue pending keyboard repeat events */
extern void SDL_CheckKeyRepeat(void);

/* Used by the OS keyboard code to detect whether or not to do UNICODE */
#ifndef DEFAULT_UNICODE_TRANSLATION
#define DEFAULT_UNICODE_TRANSLATION 0	/* Default off because of overhead */
#endif
extern int SDL_TranslateUNICODE;