Initial source commit

minorGems/util/random/Noise.h

@@ -0,0 +1,89 @@
+// Jason Rohrer
+// Noise.h
+
+/**
+*
+*	Noise generation interface
+*
+*
+*	Created 11-3-99
+*	Mods:
+*		Jason Rohrer	12-20-2000	Added a fractal noise function
+*									that fills a double array.
+*
+*/
+
+#include "minorGems/common.h"
+
+
+
+#ifndef NOISE_INCLUDED
+#define NOISE_INCLUDED
+
+
+#include <stdlib.h>
+#include <math.h>
+
+#include "RandomSource.h"
+
+
+
+
+// fills 2d image with RGBA noise
+void genRandNoise2d(unsigned long *buff, int buffHigh, int buffWide);
+
+
+
+// returns a random floating point between 0 and 1
+inline float floatRand() {
+	float invRandMax = 1 / ((float)RAND_MAX);
+	return (float)(rand()) * invRandMax;
+	}
+
+
+// fills 2d image with ARGB fractal noise
+void genFractalNoise2d(unsigned long *buff, int buffHigh, int buffWide);
+
+
+/**
+ * Fills a 2d array with 1/f fractal noise.
+ *
+ * @param inBuffer a pre-allocated buffer to fill.
+ * @param inWidth the width and height of the 2d array 
+ *   contained in the buffer.
+ *   Must be a power of 2.
+ * @param inMaxFrequency the maximum frequency of noise modulation to
+ *   include, in [2,inWidth].  Lower values produce more "blurry" or
+ *   blocky noise.
+ * @param inFPower power to raise F to whene generating noise.
+ *   Amplitude of modulation = 1 / (F^inFPower).
+ * @param inInterpolate set to true to perform interpolation of
+ *   each frequency modulation.  Setting to false produces a "blockier"
+ *   noise, while setting to true makes the noise more cloud-like.
+ * @param inRandSource the source to use for random numbers.
+ */
+void genFractalNoise2d( double *inBuffer, int inWidth, int inMaxFrequency,
+	double inFPower, char inInterpolate, RandomSource *inRandSource );
+
+
+/**
+ * Fills a 1d array with 1/f fractal noise.
+ *
+ * @param inBuffer a pre-allocated buffer to fill.
+ * @param inWidth the width of the 2d array 
+ *   contained in the buffer.
+ *   Must be a power of 2.
+ * @param inMaxFrequency the maximum frequency of noise modulation to
+ *   include, in [2,inWidth].  Lower values produce more "blurry" or
+ *   blocky noise.
+ * @param inFPower power to raise F to whene generating noise.
+ *   Amplitude of modulation = 1 / (F^inFPower). 
+ * @param inInterpolate set to true to perform interpolation of
+ *   each frequency modulation.  Setting to false produces a "blockier"
+ *   noise, while setting to true makes the noise more cloud-like.
+ * @param inRandSource the source to use for random numbers.
+ */
+void genFractalNoise( double *inBuffer, int inWidth, int inMaxFrequency,
+	double inFPower, char inInterpolate, RandomSource *inRandSource );
+
+#endif