Mercurial > sdl-ios-xcode
view include/SDL_cpuinfo.h @ 1157:baf35853ad54
Date: Mon, 10 Oct 2005 13:09:32 +0300
From: Tommi Kyntola <tommi.kyntola@ray.fi>
To: sdl@libsdl.org
Subject: [SDL] [RFC] get_ticks broken on linux
It uses gettimeofday to calculate the timedifference.
Gettimeofday returns current time which is seldom monotonous.
This breaks SDL timer subsystem. (time callbacks and all that
get borked when the time difference ms is suddenly ~ 2^32)
I posted a message about this earlier but got no response.
Some thoughts on this matter would be appreciated.
(Or even an explanation for the lack of interest.)
A patch below would use the posix timers that have been around
since posix 93 and do provide a good source of monotonous time
on linux boxes (and on few others too).
The following patch is also availabe at:
http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch
It's against 1.2.9, but I can easily rediffit against
the cvs branch is needed.
cheers,
Tommi Kyntola tommi.kyntola@ray.fi
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Tue, 11 Oct 2005 18:16:12 +0000 |
parents | ca06a994f03c |
children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 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 */ #ifndef _SDL_cpuinfo_h #define _SDL_cpuinfo_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(); /* This function returns true if the CPU has MMX features */ extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(); /* This function returns true if the CPU has MMX Ext. features */ extern DECLSPEC SDL_bool SDLCALL SDL_HasMMXExt(); /* This function returns true if the CPU has 3DNow features */ extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(); /* This function returns true if the CPU has 3DNow! Ext. features */ extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNowExt(); /* This function returns true if the CPU has SSE features */ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(); /* This function returns true if the CPU has SSE2 features */ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(); /* This function returns true if the CPU has AltiVec features */ extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(); /* Ends C function definitions when using C++ */ #ifdef __cplusplus } #endif #include "close_code.h" #endif /* _SDL_cpuinfo_h */