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1 /*
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2 glviewvol is an OpenGL 3D volume data viewer
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3 Copyright (C) 2014 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #ifndef VOLUME_H_
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19 #define VOLUME_H_
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20
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21 #include <vector>
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22 #include "image.h"
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23
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24 class Volume {
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25 public:
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26 virtual ~Volume();
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27
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28 // returns 0 if the volume is continuously defined
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29 virtual int num_samples(int dim) const;
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30
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31 // central differences offset will be delta / num_samples for discrete volumes
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32 // and delta for continuous volumes
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33 virtual void normalf(float *norm, float x, float y, float z, float delta = 1.0);
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34 virtual void normali(float *norm, int x, int y, int z);
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35
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36 virtual float valuef(float x, float y, float z) const = 0;
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37 virtual float valuei(int x, int y, int z) const = 0;
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38 };
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39
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40 class VoxelVolume : public Volume {
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41 protected:
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42 int size[3];
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43 std::vector<Image> slices;
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44
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45 float *hist;
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46 int num_hist_samples;
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47 bool hist_valid;
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48
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49 public:
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50 VoxelVolume();
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51 ~VoxelVolume();
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52
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53 bool load(const char *fname);
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54
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55 int num_samples(int dim) const;
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56
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57 float valuef(float x, float y, float z) const;
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58 float valuei(int x, int y, int z) const;
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59
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60 float *calc_histogram(int hist_samples);
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61 };
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62
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63 #endif // VOLUME_H_
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