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66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#ifndef _MATH_PFNS_H_
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#define _MATH_PFNS_H_
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#if defined( _X360 )
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#include <xboxmath.h>
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#endif
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#if !defined( _X360 )
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extern float (*pfSqrt)(float x);
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extern float (*pfRSqrt)(float x);
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extern float (*pfRSqrtFast)(float x);
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extern void (*pfFastSinCos)(float x, float* s, float* c);
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extern float (*pfFastCos)(float x);
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#define FastSqrt(x) (*pfSqrt)(x)
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#define FastRSqrt(x) (*pfRSqrt)(x)
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#define FastRSqrtFast(x) (*pfRSqrtFast)(x)
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#define FastSinCos(x,s,c) (*pfFastSinCos)(x,s,c)
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#define FastCos(x) (*pfFastCos)(x)
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#if defined(__i386__) || defined(_M_IX86)
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#undef FastSqrt
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#define FastSqrt(x) ::sqrtf(x)
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#endif
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#endif
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#if defined( _X360 )
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FORCEINLINE float _VMX_Sqrt(float x)
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{
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return __fsqrts(x);
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}
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FORCEINLINE float _VMX_RSqrt(float x)
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{
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float rroot = __frsqrte(x);
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return (0.5f * rroot) * (3.0f - (x * rroot) * rroot);
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}
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FORCEINLINE float _VMX_RSqrtFast(float x)
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{
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return __frsqrte(x);
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}
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FORCEINLINE void _VMX_SinCos(float a, float* pS, float* pC)
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{
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XMScalarSinCos(pS, pC, a);
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}
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FORCEINLINE float _VMX_Cos(float a)
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{
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return XMScalarCos(a);
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}
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#define FastSqrt(x) _VMX_Sqrt(x)
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#define FastRSqrt(x) _VMX_RSqrt(x)
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#define FastRSqrtFast(x) _VMX_RSqrtFast(x)
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#define FastSinCos(x,s,c) _VMX_SinCos(x,s,c)
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#define FastCos(x) _VMX_Cos(x)
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#endif
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#endif |