view include/SDL_cpuinfo.h @ 1542:a8bf1aa21020

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.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:39:29 +0000
parents ef9a9064bff2
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* CPU feature detection for SDL                                       */

#ifndef _SDL_cpuinfo_h
#define _SDL_cpuinfo_h

#include "SDL_stdinc.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif

/* This function returns true if the CPU has the RDTSC instruction
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC(void);

/* This function returns true if the CPU has MMX features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(void);

/* This function returns true if the CPU has MMX Ext. features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasMMXExt(void);

/* This function returns true if the CPU has 3DNow features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(void);

/* This function returns true if the CPU has 3DNow! Ext. features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNowExt(void);

/* This function returns true if the CPU has SSE features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(void);

/* This function returns true if the CPU has SSE2 features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(void);

/* This function returns true if the CPU has AltiVec features
 */
extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(void);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"

#endif /* _SDL_cpuinfo_h */