78 lines
1.6 KiB
Plaintext
78 lines
1.6 KiB
Plaintext
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#ifndef OSG_TIMER
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#define OSG_TIMER 1
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#include <osg/Export>
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namespace osg {
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#ifdef WIN32
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typedef __int64 Timer_t;
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#else
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typedef unsigned long long Timer_t;
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#endif
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class SG_EXPORT Timer {
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public:
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Timer( void );
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~Timer( void );
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#ifdef WIN32
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#pragma optimize("",off)
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inline Timer_t tick( void )
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{
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volatile Timer_t ts;
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volatile unsigned int HighPart;
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volatile unsigned int LowPart;
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_asm
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{
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xor eax, eax // Used when QueryPerformanceCounter()
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xor edx, edx // not supported or minimal overhead
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_emit 0x0f // desired
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_emit 0x31 //
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mov HighPart,edx
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mov LowPart,eax
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}
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//ts = LowPart | HighPart >> 32;
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*((unsigned int*)&ts) = LowPart;
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*((unsigned int*)&ts+1) = HighPart;
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return ts;
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}
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#pragma optimize("",on)
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#endif
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#ifdef __linux
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#define CLK(x) __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x))
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inline Timer_t tick( void ) {Timer_t x;CLK(x);return x;}
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#endif
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#ifdef __sgi
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inline Timer_t tick( void ) { return *clk; }
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#endif
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double delta_s( Timer_t t1, Timer_t t2 );
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double delta_m( Timer_t t1, Timer_t t2 );
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Timer_t delta_u( Timer_t t1, Timer_t t2 );
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Timer_t delta_n( Timer_t t1, Timer_t t2 );
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private :
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double microseconds_per_click;
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double nanoseconds_per_click;
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unsigned long *clk;
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int cycleCntrSize;
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static unsigned long dummy;
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static int inited;
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static double cpu_mhz;
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void init( void );
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};
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};
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#endif
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