PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/textures/dots.h
00001 
00002 /*
00003     pbrt source code Copyright(c) 1998-2012 Matt Pharr and Greg Humphreys.
00004 
00005     This file is part of pbrt.
00006 
00007     Redistribution and use in source and binary forms, with or without
00008     modification, are permitted provided that the following conditions are
00009     met:
00010 
00011     - Redistributions of source code must retain the above copyright
00012       notice, this list of conditions and the following disclaimer.
00013 
00014     - Redistributions in binary form must reproduce the above copyright
00015       notice, this list of conditions and the following disclaimer in the
00016       documentation and/or other materials provided with the distribution.
00017 
00018     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
00019     IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
00020     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
00021     PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
00022     HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00023     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00024     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00025     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00026     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00027     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00028     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029 
00030  */
00031 
00032 #if defined(_MSC_VER)
00033 #pragma once
00034 #endif
00035 
00036 #ifndef PBRT_TEXTURES_DOTS_H
00037 #define PBRT_TEXTURES_DOTS_H
00038 
00039 // textures/dots.h*
00040 #include "pbrt.h"
00041 #include "texture.h"
00042 #include "paramset.h"
00043 
00044 // DotsTexture Declarations
00045 template <typename T> class DotsTexture : public Texture<T> {
00046 public:
00047     // DotsTexture Public Methods
00048     ~DotsTexture() {
00049         delete mapping;
00050     }
00051     DotsTexture(TextureMapping2D *m, Reference<Texture<T> > t1,
00052                 Reference<Texture<T> > t2)
00053         : mapping(m), outsideDot(t1), insideDot(t2) {
00054     }
00055     T Evaluate(const DifferentialGeometry &dg) const {
00056         // Compute cell indices for dots
00057         float s, t, dsdx, dtdx, dsdy, dtdy;
00058         mapping->Map(dg, &s, &t, &dsdx, &dtdx, &dsdy, &dtdy);
00059         int sCell = Floor2Int(s + .5f), tCell = Floor2Int(t + .5f);
00060 
00061         // Return _insideDot_ result if point is inside dot
00062         if (Noise(sCell+.5f, tCell+.5f) > 0) {
00063             float radius = .35f;
00064             float maxShift = 0.5f - radius;
00065             float sCenter = sCell + maxShift *
00066                 Noise(sCell + 1.5f, tCell + 2.8f);
00067             float tCenter = tCell + maxShift *
00068                 Noise(sCell + 4.5f, tCell + 9.8f);
00069             float ds = s - sCenter, dt = t - tCenter;
00070             if (ds*ds + dt*dt < radius*radius)
00071                 return insideDot->Evaluate(dg);
00072         }
00073         return outsideDot->Evaluate(dg);
00074     }
00075 private:
00076     // DotsTexture Private Data
00077     TextureMapping2D *mapping;
00078     Reference<Texture<T> > outsideDot, insideDot;
00079 };
00080 
00081 
00082 DotsTexture<float> *CreateDotsFloatTexture(const Transform &tex2world,
00083         const TextureParams &tp);
00084 DotsTexture<Spectrum> *CreateDotsSpectrumTexture(const Transform &tex2world,
00085         const TextureParams &tp);
00086 
00087 #endif // PBRT_TEXTURES_DOTS_H