99 lines
3.3 KiB
C
Executable File
99 lines
3.3 KiB
C
Executable File
/**********************************************************************
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*<
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FILE: texutil.h
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DESCRIPTION:
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CREATED BY: Dan Silva
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HISTORY:
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*> Copyright (c) 1994, All Rights Reserved.
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**********************************************************************/
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#ifndef __TEXUTIL__H
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#define __TEXUTIL__H
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//
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// Misc. noise functions from Texturing and Modeling A Procedural Approach
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// Perlin, Musgrave...
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//
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CoreExport float bias(float a, float b);
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CoreExport float gain(float a, float b);
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CoreExport float clamp(float x, float a, float b);
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CoreExport float boxstep(float a, float b, float x); // linear from (a,0) to (b,1)
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CoreExport float smoothstep(float a, float b, float x); // Hermite cubic from (a,0) to (b,1)
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CoreExport float mod(float x, float m); // returns x Mod m, handles negatives correctly
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CoreExport int mod(int x, int m); // returns x Mod m, handles negatives correctly
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// This function makes a sort of straight segment S curve.
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// sramp() is a for x < a-d and b for x > b+d.
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// for a+d < x < b-d sramp(x) = x
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// for a-d < x < a+d sramp makes a smooth transition (parabolic) from
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// sramp' = 0 to sramp' = 1
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// for b-d < x < b+d sramp makes a smooth transition (parabolic) from
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// sramp' = 1 to sramp' = 0
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CoreExport float sramp(float x,float a, float b, float d);
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// returns 0 if x<a, 1 if x>b otherwise x.
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CoreExport float threshold(float x,float a, float b);
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CoreExport void setdebug(int i);
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CoreExport float noise1(float arg);
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CoreExport float noise2(Point2 p);
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CoreExport float noise3(Point3 p);
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CoreExport float noise4(Point3 p,float time);
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// This is 3DStudio's Noise function: its only slightly different from noise3:
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// scaled up by factor of 1.65 and clamped to -1,+1.
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CoreExport float noise3DS(Point3 p);
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CoreExport float turbulence(Point3& p, float freq);
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CoreExport int Perm(int v);
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#define MAX_OCTAVES 50
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CoreExport float fBm1(float point, float H, float lacunarity, float octaves);
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CoreExport float fBm1(Point2 point, float H, float lacunarity, float octaves);
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CoreExport float fBm1(Point3 point, float H, float lacunarity, float octaves);
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CoreExport float spline(float x, int nknots, float *knot);
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CoreExport Color color_spline(float x, int nknots, Color *knot);
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// faster version of floor
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inline int FLOOR( float x) { return ((int)(x)-((x)<0.0f)); }
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inline float frac(float x) { return x - (float)FLOOR(x); }
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inline float fmax(float x, float y) { return x>y?x:y; }
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inline float fmin(float x, float y) { return x<y?x:y; }
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// Macro to map it into interval [0,1]
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#define NOISE(p) ((1.0f+noise3DS(p))*.5f)
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// alpha-composite ctop on top of cbot, assuming pre-multiplied alpha
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inline AColor AComp(AColor cbot, AColor ctop) {
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float ia = 1.0f - ctop.a;
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return (ctop + ia*cbot);
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}
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//-----------------------------------------------------------
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// Based on: A Cellular Basis Function
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// Steven Worley
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//
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// SIGGRAPH 1996 Conference Procedings
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//
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#define MAX_CELL_LEVELS 20
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CoreExport void CellFunction(Point3 v,int n,float *dist,int *celIDs=NULL,Point3 *grads=NULL,float gradSmooth=0.0f);
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CoreExport void FractalCellFunction(Point3 v,float iterations, float lacunarity,int n,float *dist,int *celIDs=NULL,Point3 *grads=NULL,float gradSmooth=0.0f);
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CoreExport float RandFromCellID(int id);
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#endif
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