src/cpuinfo/SDL_cpuinfo.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 18 Nov 2003 01:27:06 +0000
changeset 739 22dbf364c017
child 745 71ee03909f42
permissions -rw-r--r--
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h

/*
    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

/* CPU feature detection for SDL */

#include "SDL.h"
//#include "SDL_cpuinfo.h"

#define CPU_HAS_MMX	0x00000001
#define CPU_HAS_3DNOW	0x00000002
#define CPU_HAS_SSE	0x00000004

/* These functions come from SciTech's PM library */
extern int CPU_haveMMX();
extern int CPU_have3DNow();
extern int CPU_haveSSE();

static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;

static Uint32 SDL_GetCPUFeatures()
{
	if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
		SDL_CPUFeatures = 0;
		if ( CPU_haveMMX() ) {
			SDL_CPUFeatures |= CPU_HAS_MMX;
		}
		if ( CPU_have3DNow() ) {
			SDL_CPUFeatures |= CPU_HAS_3DNOW;
		}
		if ( CPU_haveSSE() ) {
			SDL_CPUFeatures |= CPU_HAS_SSE;
		}
	}
	return SDL_CPUFeatures;
}

SDL_bool SDL_HasMMX()
{
	if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
		return SDL_TRUE;
	}
	return SDL_FALSE;
}

SDL_bool SDL_Has3DNow()
{
	if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
		return SDL_TRUE;
	}
	return SDL_FALSE;
}

SDL_bool SDL_HasSSE()
{
	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
		return SDL_TRUE;
	}
	return SDL_FALSE;
}

#ifdef TEST_MAIN

#include <stdio.h>

int main()
{
	printf("MMX: %d\n", SDL_HasMMX());
	printf("3DNow: %d\n", SDL_Has3DNow());
	printf("SSE: %d\n", SDL_HasSSE());
}

#endif /* TEST_MAIN */