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
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /* CPU feature detection for SDL */
    29 
    30 #include "SDL.h"
    31 //#include "SDL_cpuinfo.h"
    32 
    33 #define CPU_HAS_MMX	0x00000001
    34 #define CPU_HAS_3DNOW	0x00000002
    35 #define CPU_HAS_SSE	0x00000004
    36 
    37 /* These functions come from SciTech's PM library */
    38 extern int CPU_haveMMX();
    39 extern int CPU_have3DNow();
    40 extern int CPU_haveSSE();
    41 
    42 static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
    43 
    44 static Uint32 SDL_GetCPUFeatures()
    45 {
    46 	if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
    47 		SDL_CPUFeatures = 0;
    48 		if ( CPU_haveMMX() ) {
    49 			SDL_CPUFeatures |= CPU_HAS_MMX;
    50 		}
    51 		if ( CPU_have3DNow() ) {
    52 			SDL_CPUFeatures |= CPU_HAS_3DNOW;
    53 		}
    54 		if ( CPU_haveSSE() ) {
    55 			SDL_CPUFeatures |= CPU_HAS_SSE;
    56 		}
    57 	}
    58 	return SDL_CPUFeatures;
    59 }
    60 
    61 SDL_bool SDL_HasMMX()
    62 {
    63 	if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
    64 		return SDL_TRUE;
    65 	}
    66 	return SDL_FALSE;
    67 }
    68 
    69 SDL_bool SDL_Has3DNow()
    70 {
    71 	if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
    72 		return SDL_TRUE;
    73 	}
    74 	return SDL_FALSE;
    75 }
    76 
    77 SDL_bool SDL_HasSSE()
    78 {
    79 	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
    80 		return SDL_TRUE;
    81 	}
    82 	return SDL_FALSE;
    83 }
    84 
    85 #ifdef TEST_MAIN
    86 
    87 #include <stdio.h>
    88 
    89 int main()
    90 {
    91 	printf("MMX: %d\n", SDL_HasMMX());
    92 	printf("3DNow: %d\n", SDL_Has3DNow());
    93 	printf("SSE: %d\n", SDL_HasSSE());
    94 }
    95 
    96 #endif /* TEST_MAIN */