Engine directory for ticket #1

Engine/source/util/noise2d.h

@@ -0,0 +1,95 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#ifndef _NOISE2D_H_
+#define _NOISE2D_H_
+
+
+#ifndef _PLATFORM_H_
+#include "platform/platform.h"
+#endif
+#ifndef _MMATH_H_
+#include "math/mMath.h"
+#endif
+#ifndef _MRANDOM_H_
+#include "math/mRandom.h"
+#endif
+
+class Noise2D
+{
+private:
+   enum Constants {
+      SIZE      = 0x100,
+      SIZE_MASK = 0x0ff
+   };
+   S32 mPermutation[SIZE + SIZE + 2];
+   F32 mGradient[SIZE + SIZE + 2][2];
+
+   U32 mSeed;
+
+   MRandom mRandom;
+
+   F32  lerp(F32 t, F32 a, F32 b);
+   F32  curve(F32 t);
+   void setup(F32 t, S32 &b0, S32 &b1, F32 &r0, F32 &r1);
+   F32  dot(const F32 *q, F32 rx, F32 ry);
+   void normalize(F32 v[2]);
+
+public:
+   Noise2D();
+   ~Noise2D();
+
+   void setSeed(U32 seed);
+   U32  getSeed();
+
+   F32  getValue(F32 u, F32 v, S32 interval);
+
+   /// @name Noise
+   /// These functions actually generate
+   /// noise values into the passed in destination
+   /// array.
+   ///
+   /// Note that the output values of these functions
+   /// are from -1.0 to 1.0.
+   /// 
+   /// fBm - Fractal Brownian Motion - A simple noise generation
+   /// algorithm, it tends to generate either flowing rounded
+   /// hills or rounded mountainous shapes.
+   /// @{
+   void fBm( Vector<F32> *dst, U32 size, U32 interval, F32 h, F32 octave=5.0f);
+   
+   /// rigidMultiFractal
+   /// Creates ridged mountains with a high frequency detail.
+   void rigidMultiFractal( Vector<F32> *dst, Vector<F32> *signal, U32 size, U32 interval, F32 h, F32 octave=5.0f);
+   /// @}
+   
+   bool erodeHydraulic(Vector<F32> *src, Vector<F32> *dst, U32 iterations, U32 size );
+   bool erodeThermal(Vector<F32> *src, Vector<F32> *dst, F32 slope, F32 materialLoss, U32 iterations, U32 size, U32 squareSize, F32 maxHeight );
+
+   F32  turbulence(F32 x, F32 y, F32 freq);
+
+   void getMinMax( Vector<F32> *src, F32 *maxNoise, F32 *minNoise, U32 size );
+};
+
+
+
+#endif  // _NOISE2D_H_