1 | /* |
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2 | * ---------------------------------------------------------------------- |
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3 | * Lic.h: line integral convolution class |
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4 | * |
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5 | * ====================================================================== |
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6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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7 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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8 | * |
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9 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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10 | * |
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11 | * See the file "license.terms" for information on usage and |
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12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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13 | * ====================================================================== |
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14 | */ |
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15 | |
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16 | |
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17 | #ifndef _LIC_H_ |
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18 | #define _LIC_H_ |
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19 | |
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20 | #include "GL/glew.h" |
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21 | #include "Cg/cgGL.h" |
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22 | |
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23 | #include "define.h" |
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24 | #include "config.h" |
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25 | #include "global.h" |
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26 | |
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27 | #include "Renderable.h" |
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28 | #include "Vector3.h" |
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29 | #include "Volume.h" |
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30 | |
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31 | #define NPN 256 //resolution of background pattern |
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32 | #define NMESH 256 //resolution of flow mesh |
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33 | #define DM ((float) (1.0/(NMESH-1.0))) //distance in world coords between mesh lines |
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34 | #define NPIX 512 //display size |
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35 | #define SCALE 3.0 //scale for background pattern. small value -> fine texture |
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36 | |
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37 | class Lic : public Renderable { |
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38 | |
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39 | private: |
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40 | int width, height; |
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41 | int size; //the lic is a square of size, it can be stretched |
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42 | float* slice_vector; //storage for the per slice vectors driving the follow |
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43 | Vector3 scale; //scaling factor stretching the lic plane to fit the actual dimensions |
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44 | float offset; //[0,1] offset could be x, y, or z direction |
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45 | |
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46 | //some convolve variables. They can pretty much stay fixed |
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47 | int iframe; |
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48 | int Npat; |
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49 | int alpha; |
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50 | float sa; |
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51 | float tmax; |
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52 | float dmax; |
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53 | |
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54 | //CG shader parameters |
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55 | CGcontext m_g_context; |
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56 | CGparameter m_vel_tex_param; |
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57 | CGparameter m_vel_tex_param_render_vel, m_plane_normal_param_render_vel; |
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58 | CGprogram m_render_vel_fprog; |
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59 | |
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60 | NVISid color_tex, pattern_tex, mag_tex; |
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61 | NVISid fbo, vel_fbo, slice_vector_tex; //for projecting 3d vector to 2d vector on a plane |
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62 | |
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63 | Volume* vector_field; |
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64 | |
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65 | public: |
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66 | Vector3 normal; //the normal vector of the Lic plane, |
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67 | //the inherited Vector3 location is its center |
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68 | Lic(int _size, int _width, int _height, float _offset, |
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69 | CGcontext _context, NVISid _vector_field, |
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70 | float scalex, float scaley, float scalez); |
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71 | ~Lic(); |
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72 | |
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73 | void convolve(); |
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74 | void display(); //display the convolution result |
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75 | void render(); |
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76 | void make_patterns(); |
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77 | void make_magnitudes(); |
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78 | void get_velocity(float x, float y, float* px, float* py); |
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79 | void get_slice(); |
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80 | void set_offset(float v); |
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81 | |
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82 | }; |
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83 | |
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84 | #endif |
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