wrinkled.cpp

/*
    pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys.

    This file is part of pbrt.

    pbrt is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.  Note that the text contents of
    the book "Physically Based Rendering" are *not* licensed under the
    GNU GPL.

    pbrt is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

// wrinkled.cpp*
#include "pbrt.h"
#include "texture.h"
#include "paramset.h"
// WrinkledTexture Declarations
template <class T> class WrinkledTexture : public Texture<T> {
public:
	// WrinkledTexture Public Methods
	~WrinkledTexture() {
		delete mapping;
	}
	WrinkledTexture(int oct, float roughness, TextureMapping3D *map) {
		omega = roughness;
		octaves = oct;
		mapping = map;
	}
	T Evaluate(const DifferentialGeometry &dg) const {
		Vector dpdx, dpdy;
		Point P = mapping->Map(dg, &dpdx, &dpdy);
		return Turbulence(P, dpdx, dpdy, omega, octaves);
	}
private:
	// WrinkledTexture Private Data
	int octaves;
	float omega;
	TextureMapping3D *mapping;
};
// WrinkledTexture Method Definitions
extern "C" DLLEXPORT Texture<float> * CreateFloatTexture(const Transform &tex2world,
		const TextureParams &tp) {
	// Initialize 3D texture mapping _map_ from _tp_
	TextureMapping3D *map = new IdentityMapping3D(tex2world);
	return new WrinkledTexture<float>(tp.FindInt("octaves", 8),
		tp.FindFloat("roughness", .5f), map);
}

extern "C" DLLEXPORT Texture<Spectrum> * CreateSpectrumTexture(const Transform &tex2world,
		const TextureParams &tp) {
	// Initialize 3D texture mapping _map_ from _tp_
	TextureMapping3D *map = new IdentityMapping3D(tex2world);
	return new WrinkledTexture<Spectrum>(tp.FindInt("octaves", 8),
		tp.FindFloat("roughness", .5f), map);
}