2007-06-12 22:20:16 +08:00
|
|
|
/* -*-c++-*-
|
|
|
|
|
*
|
|
|
|
|
* OpenSceneGraph example, osgshaders.
|
|
|
|
|
*
|
|
|
|
|
* 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 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.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
2003-10-05 19:30:54 +08:00
|
|
|
/************************************************************************
|
|
|
|
|
* *
|
|
|
|
|
* Copyright (C) 2002 3Dlabs Inc. Ltd. *
|
|
|
|
|
* *
|
|
|
|
|
***********************************************************************/
|
|
|
|
|
|
|
|
|
|
#ifndef __ogl2_demo_h__
|
|
|
|
|
#define __ogl2_demo_h__
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
extern void SetNoiseFrequency(int frequency);
|
|
|
|
|
|
|
|
|
|
extern double noise1(double arg);
|
|
|
|
|
extern double noise2(double vec[2]);
|
|
|
|
|
extern double noise3(double vec[3]);
|
|
|
|
|
extern void normalize2(double vec[2]);
|
|
|
|
|
extern void normalize3(double vec[3]);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
In what follows "alpha" is the weight when the sum is formed.
|
|
|
|
|
Typically it is 2, As this approaches 1 the function is noisier.
|
|
|
|
|
"beta" is the harmonic scaling/spacing, typically 2.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
extern double PerlinNoise1D(double x,double alpha, double beta, int n);
|
|
|
|
|
extern double PerlinNoise2D(double x,double y,double alpha, double beta, int n);
|
|
|
|
|
extern double PerlinNoise3D(double x,double y,double z,double alpha, double beta, int n);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#endif // __ogl2_demo_h__
|
