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Editor/Util/fastlib.h

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+#ifndef __FAST_CODE_H_INCLUDED__
+#define __FAST_CODE_H_INCLUDED__
+
+// Needed to control floating-point pecision
+#include <float.h>
+
+////////////////////////////////////////////////////////////////////////
+// Casting - Taken from the www.gamedev.net forums and www.nvidia.com
+////////////////////////////////////////////////////////////////////////
+
+#define __clamp(v, _min, _max) ( (v>_max) ? (_max) : ( (v<_min) ? (_min) : (v) ) )
+
+#ifdef WIN64
+
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+// Round a floating point number to an integer. Note that (int + .5)
+// is rounded to (int + 1).
+__forceinline int RoundFloatToInt (float f)
+{
+	return (int)(f+0.5f);
+}
+
+// Doesn't take the pointer, is a bit faster
+__forceinline int __stdcall FloatToIntRet(float  x)
+{
+	return (int)(x+0.5f);
+}
+
+// Casting floats to unsigned chars is also very expensive, just
+// NEVER cast with (unsigned char)
+__forceinline BYTE __stdcall FloatToByte(float  x) 
+{ 
+	float  t = x + (float) 0xC00000;
+	return * (BYTE *) &t; 
+}
+
+// Fast floor() for (x >= 0) && (x < 2^31). MUCH faster than the normal
+// floor()
+__forceinline unsigned int __stdcall ifloor(float  x)
+{
+	DWORD e = (0x7F + 31) - ((* (DWORD *) &x & 0x7F800000) >> 23);
+	DWORD m = 0x80000000 | (* (DWORD *) &x << 8);
+	return (m >> e) & -(e < 32); 
+}
+
+// Converts to integer equal to or less than, asm version
+__forceinline int ftoi(float f)
+{
+	return (int)(f);
+}
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+
+#else //WIN64
+
+// Round a floating point number to an integer. Note that (int + .5)
+// is rounded to (int + 1).
+__forceinline int RoundFloatToInt (float f)
+{
+	int i;
+	__asm fld [f]
+	__asm fistp [i]
+	return i;
+}
+
+// Doesn't take the pointer, is a bit faster
+__forceinline int __stdcall FloatToIntRet(float  x)
+{
+	int	   t;
+	__asm  fld   x  
+	__asm  fistp t
+	return t;
+}
+ 
+// Casting floats to unsigned chars is also very expensive, just
+// NEVER cast with (unsigned char)
+__forceinline BYTE __stdcall FloatToByte(float  x) 
+{ 
+	float  t = x + (float) 0xC00000;
+	return * (BYTE *) &t; 
+}
+
+// Fast floor() for (x >= 0) && (x < 2^31). MUCH faster than the normal
+// floor()
+__forceinline unsigned int __stdcall ifloor(float  x)
+{
+	DWORD e = (0x7F + 31) - ((* (DWORD *) &x & 0x7F800000) >> 23);
+	DWORD m = 0x80000000 | (* (DWORD *) &x << 8);
+	return (m >> e) & -(e < 32); 
+}
+
+// Converts to integer equal to or less than, asm version
+__forceinline int ftoi(float f)
+{
+	static float Half = 0.5;
+	int i; 
+	__asm fld [f]
+	__asm fsub [Half]
+	__asm fistp [i]
+	return i;
+}
+
+#endif //WIN64
+
+//! Return random value in [-1,1] diaposone.
+inline float frand()
+{
+	return ((float)rand()*2.0f / RAND_MAX) - 1.0f;
+}
+
+#endif // __FAST_CODE_H_INCLUDED__