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1 #ifndef _MSC_VER
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2 #include <alloca.h>
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3 #else
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4 #include <malloc.h>
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5 #endif
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6 #include "vein.h"
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7 #include "geom.h"
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8
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9 Vein::Vein()
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10 {
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11 gen_dist = 8.0;
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12 subdiv = 8;
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13 ring_subdiv = 16;
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14 rad = 1.0;
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15
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16 idxbuf = 0;
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17 }
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18
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19 Vein::~Vein()
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20 {
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21 delete [] idxbuf;
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22 }
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23
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24 Vector3 Vein::calc_center(const Vector3 &ppos) const
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25 {
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26 // TODO add variation
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27 return Vector3(0.0, 0.0, ppos.z);
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28 }
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29
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30 Vector3 Vein::calc_dir(const Vector3 &ppos) const
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31 {
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32 // TODO add variation
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33 return Vector3(0, 0, 1);
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34 }
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35
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36 void Vein::build_idxbuf()
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37 {
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38 delete [] idxbuf;
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39
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40 int nfaces = subdiv * ring_subdiv;
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41 int nidx = nfaces * 4;
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42 idxbuf = new unsigned int[nidx];
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43 unsigned int *idxptr = idxbuf;
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44
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45 for(int i=0; i<subdiv; i++) {
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46 for(int j=0; j<ring_subdiv; j++) {
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47 idxptr[0] = i * ring_subdiv + j;
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48 idxptr[1] = i * ring_subdiv + ((j + 1) % ring_subdiv);
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49 idxptr[2] = idxptr[1] + ring_subdiv;
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50 idxptr[3] = idxptr[0] + ring_subdiv;
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51 idxptr += 4;
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52 }
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53 }
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54 }
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55
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56 void Vein::draw(const Vector3 &ppos) const
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57 {
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58 float start_z = ppos.z - gen_dist / 2.0;
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59 float dz = gen_dist / subdiv;
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60
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61 int nslices = subdiv + 1;
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62 int nverts = nslices * ring_subdiv;
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63 int nfaces = subdiv * ring_subdiv;
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64 Vertex *vbuf = (Vertex*)alloca(nverts * sizeof *vbuf);
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65 Vertex *vptr = vbuf;
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66
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67 Vector3 pt = ppos;
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68 pt.z = start_z;
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69
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70 for(int i=0; i<nslices; i++) {
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71 Vector3 cent = calc_center(pt);
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72 Vector3 dir = calc_dir(pt);
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73 Vector3 up(0, 1, 0);
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74 Vector3 right = cross_product(up, dir);
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75 up = cross_product(dir, right);
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76
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77 Matrix3x3 vrot{right, up, dir};
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78 //Quaternion vrot(dri, dtheta);
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79
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80 float theta = 0.0, dtheta = 2.0 * M_PI / ring_subdiv;
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81 for(int j=0; j<ring_subdiv; j++) {
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82 Vector3 vec = Vector3{-cos(theta) * rad, sin(theta) * rad, 0.0} + cent;
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83 vec.transform(vrot);
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84
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85 vptr->pos = vec;
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86 vptr->norm = cent - vec;
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87 vptr->tang = Vector3(); // TODO
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88 vptr->tc = Vector2(); // TODO
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89 vptr++;
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90
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91 theta += dtheta;
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92 }
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93
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94 pt.z += dz;
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95 }
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96
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97 // also create the index buffer if it's not valid
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98 if(!idxbuf) {
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99 ((Vein*)this)->build_idxbuf();
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100 }
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101
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102 // awesome, now draw it
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103 draw_mesh(GL_QUADS, nfaces * 4, vbuf, idxbuf);
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104 }
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