port from perforce

underwater4k/small.h

@@ -0,0 +1,127 @@
+#pragma once
+
+#pragma code_seg("sm0")
+
+DWORD x_Ftol(float af_Value)
+{
+	DWORD ldw_RetVal;
+	__asm fld af_Value
+	__asm fistp ldw_RetVal
+	return ldw_RetVal;
+}
+
+#pragma code_seg("sm1")
+
+__forceinline float x_Frac(float af_Value)
+{
+	return af_Value - x_Ftol(af_Value);
+}
+
+#pragma code_seg("sm2")
+
+__forceinline float x_Abs(float af_Value)
+{
+	__asm fld	af_Value
+	__asm fabs
+}
+
+#pragma code_seg("sm3")
+
+float x_Sin(float af_Value)
+{
+	__asm fld	af_Value
+	__asm fsin
+}
+
+#pragma code_seg("sm4")
+
+float x_Sign(float af_Value)
+{
+	if (af_Value != 0)
+		return af_Value / x_Abs(af_Value);
+
+	return 1.0f;
+}
+
+#pragma code_seg("sm5")
+
+float x_Sqrt(float af_Value)
+{
+	__asm fld af_Value
+	__asm fsqrt
+}
+
+#pragma code_seg("sm7")
+
+__forceinline void x_MemCopy(void* av_Dest_, const void* av_Src_, size_t ai_Size)
+{
+	__asm mov esi, av_Src_
+	__asm mov edi, av_Dest_
+	__asm mov ecx, ai_Size
+	__asm rep movsb
+}
+
+#pragma code_seg("sm8")
+
+float x_Fmod(float x, float y)
+{
+	__asm fld	y
+	__asm fld	x
+	__asm fprem
+	__asm fxch
+	__asm fstp	x
+}
+
+#pragma data_seg("smA")
+
+static unsigned long seed=0x12345678;
+
+#pragma code_seg("sm9")
+
+__forceinline void x_Randomize(unsigned long x)
+{
+	seed = x;
+}
+
+#pragma code_seg("smB")
+
+float x_Rand()
+{
+	seed = seed * 0x76364873 + 1234567;
+	return (float)(seed & 0x7FFFFFFF) * (const float)(2.0f / (float)0x7FFFFFFF) - 1.0f;
+}
+
+#pragma code_seg("smS")
+
+__forceinline size_t x_Strlen(const char* as_String)
+{
+	size_t li_Length = 0;
+	while (*as_String++) ++li_Length;
+	return li_Length;
+}
+
+#pragma code_seg("smP")
+
+float x_Pow(float x, float y){
+	float r;
+	__asm{
+		fld y
+		fld x
+		fyl2x
+		fld1
+		fld st(1)
+		fprem
+		f2xm1
+		faddp st(1),st
+		fscale
+		fxch st(1)
+		fstp st(0)
+		fstp r
+	}
+	return r;
+}
+
+extern "C" 
+{
+	int _fltused = 1;
+}