Initial commit

Minecraft.World/Mth.cpp

@@ -0,0 +1,172 @@
+#include "stdafx.h"
+#include "Mth.h"
+#include "Random.h"
+
+const int Mth::BIG_ENOUGH_INT = 1024;
+const float Mth::BIG_ENOUGH_FLOAT = BIG_ENOUGH_INT;
+const float Mth::RAD_TO_GRAD = PI / 180.0f;
+const float Mth::DEGRAD = PI / 180.0f;
+const float Mth::RADDEG = 180.0f / PI;
+
+float *Mth::_sin = NULL;
+
+const float Mth::sinScale = 65536.0f / (float) (PI * 2);
+
+// 4J - added - was in static constructor
+void Mth::init()
+{
+    _sin = new float[65536];
+    for (int i = 0; i < 65536; i++)
+	{
+        _sin[i] = (float) ::sin(i * PI * 2 / 65536.0f);
+    }
+}
+
+float Mth::sin(float i)
+{
+	if(_sin == NULL) init();		// 4J - added
+	return _sin[(int) (i * sinScale) & 65535];
+}
+
+float Mth::cos(float i)
+{
+	if(_sin == NULL) init();		// 4J - added
+	return _sin[(int) (i * sinScale + 65536 / 4) & 65535];
+}
+
+float Mth::sqrt(float x)
+{
+	return (float) ::sqrt(x);
+}
+
+float Mth::sqrt(double x)
+{
+	return (float) ::sqrt(x);
+}
+
+int Mth::floor(float v)
+{
+    int i = (int) v;
+    return v < i ? i - 1 : i;
+}
+
+__int64 Mth::lfloor(double v)
+{
+    __int64 i = (__int64) v;
+    return v < i ? i - 1 : i;
+}
+
+int Mth::fastFloor(double x)
+{
+	return (int) (x + BIG_ENOUGH_FLOAT) - BIG_ENOUGH_INT;
+}
+
+int Mth::floor(double v)
+{
+    int i = (int) v;
+    return v < i ? i - 1 : i;
+}
+
+int Mth::absFloor(double v)
+{
+	return (int) (v >= 0 ? v : -v + 1);
+}
+
+float Mth::abs(float v)
+{
+	return v >= 0 ? v : -v;
+}
+
+int Mth::abs(int v)
+{
+	return v >= 0 ? v : -v;
+}
+
+int Mth::ceil(float v)
+{
+    int i = (int) v;
+    return v > i ? i + 1 : i;
+}
+
+int Mth::clamp(int value, int min, int max)
+{
+    if (value < min)
+	{
+        return min;
+    }
+    if (value > max)
+	{
+        return max;
+    }
+    return value;
+}
+
+float Mth::clamp(float value, float min, float max)
+{
+	if (value < min)
+	{
+		return min;
+	}
+	if (value > max)
+	{
+		return max;
+	}
+	return value;
+}
+
+double Mth::asbMax(double a, double b)
+{
+    if (a < 0) a = -a;
+    if (b < 0) b = -b;
+    return a > b ? a : b;
+}
+
+int Mth::intFloorDiv(int a, int b)
+{
+    if (a < 0) return -((-a - 1) / b) - 1;
+    return a / b;
+}
+
+
+int Mth::nextInt(Random *random, int minInclusive, int maxInclusive)
+{
+    if (minInclusive >= maxInclusive)
+	{
+        return minInclusive;
+    }
+    return random->nextInt(maxInclusive - minInclusive + 1) + minInclusive;
+}
+
+float Mth::wrapDegrees(float input)
+{
+	//input %= 360;
+	while (input >= 180)
+	{
+		input -= 360;
+	}
+	while (input < -180)
+	{
+		input += 360;
+	}
+	return input;
+}
+
+double Mth::wrapDegrees(double input)
+{
+	//input %= 360;
+	while (input >= 180)
+	{
+		input -= 360;
+	}
+	while (input < -180)
+	{
+		input += 360;
+	}
+	return input;
+}
+
+// 4J Added
+bool Mth::almostEquals( double double1, double double2, double precision)
+{
+	return (std::abs(double1 - double2) <= precision);
+}