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1 #include <stdio.h>
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2 #ifndef _MSC_VER
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3 #include <alloca.h>
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4 #else
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5 #include <malloc.h>
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6 #endif
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7 #include "vein.h"
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8 #include "geom.h"
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9 #include "sdr.h"
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10
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11 Vein::Vein()
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12 {
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13 gen_dist = 16.0;
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14 subdiv = 16;
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15 ring_subdiv = 16;
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16 rad = 1.0;
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17
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18 idxbuf = 0;
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19 }
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20
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21 Vein::~Vein()
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22 {
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23 delete [] idxbuf;
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24 }
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25
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26 Vector3 Vein::calc_center(const Vector3 &ppos) const
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27 {
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28 Vector3 pt{0, 0, ppos.z};
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29 pt.x = sin(ppos.z * 0.75);
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30 pt.y = cos(ppos.z * 0.2) * 0.6;
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31 return pt;
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32 }
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33
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34 Vector3 Vein::calc_dir(const Vector3 &ppos) const
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35 {
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36 Vector3 dir = calc_center(ppos + Vector3(0, 0, 0.01)) - calc_center(ppos - Vector3(0, 0, 0.01));
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37 return dir.normalized();
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38 }
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39
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40 void Vein::build_idxbuf()
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41 {
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42 delete [] idxbuf;
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43
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44 int nfaces = subdiv * ring_subdiv;
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45 int nidx = nfaces * 4;
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46 idxbuf = new unsigned int[nidx];
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47 unsigned int *idxptr = idxbuf;
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48
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49 for(int i=0; i<subdiv; i++) {
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50 for(int j=0; j<ring_subdiv; j++) {
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51 idxptr[0] = i * ring_subdiv + j;
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52 idxptr[1] = i * ring_subdiv + ((j + 1) % ring_subdiv);
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53 idxptr[2] = idxptr[1] + ring_subdiv;
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54 idxptr[3] = idxptr[0] + ring_subdiv;
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55 idxptr += 4;
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56 }
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57 }
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58 }
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59
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60 bool Vein::init()
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61 {
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62 if(!(sdr = create_program_load("sdr/vein.v.glsl", "sdr/vein.p.glsl"))) {
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63 fprintf(stderr, "failed to load vein shaders\n");
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64 return false;
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65 }
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66 if((attr_tang_loc = get_attrib_loc(sdr, "attr_tang")) == -1) {
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67 fprintf(stderr, "can't find tangent attribute!\n");
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68 }
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69 return true;
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70 }
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71
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72 void Vein::draw(const Vector3 &ppos) const
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73 {
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74 float start_z = ppos.z - gen_dist / 2.0;
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75 float dz = gen_dist / subdiv;
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76
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77 int nslices = subdiv + 1;
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78 int nverts = nslices * ring_subdiv;
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79 int nfaces = subdiv * ring_subdiv;
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80 Vertex *vbuf = (Vertex*)alloca(nverts * sizeof *vbuf);
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81 Vertex *vptr = vbuf;
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82
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83 Vector3 pt = ppos;
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84 pt.z = start_z;
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85
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86 for(int i=0; i<nslices; i++) {
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87 Vector3 cent = calc_center(pt);
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88 Vector3 dir = calc_dir(pt);
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89 Vector3 up(0, 1, 0);
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90 Vector3 right = cross_product(up, dir);
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91 up = cross_product(dir, right);
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92
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93 Matrix3x3 vrot{right, up, dir};
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94 vrot.transpose();
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95
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96 float theta = 0.0, dtheta = 2.0 * M_PI / ring_subdiv;
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97 for(int j=0; j<ring_subdiv; j++) {
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98 Vector3 vec = Vector3{-cos(theta) * rad, sin(theta) * rad, 0.0};
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99 vec.transform(vrot);
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100 vec += cent;
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101
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102 vptr->pos = vec;
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103 vptr->norm = cent - vec;
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104 vptr->tang = dir;
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105 vptr->tc = Vector2(); // TODO
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106 vptr++;
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107
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108 theta += dtheta;
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109 }
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110
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111 pt.z += dz;
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112 }
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113
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114 // also create the index buffer if it's not valid
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115 if(!idxbuf) {
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116 ((Vein*)this)->build_idxbuf();
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117 }
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118
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119 // awesome, now draw it
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120 bind_program(sdr);
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121 draw_mesh(GL_QUADS, nfaces * 4, vbuf, idxbuf, attr_tang_loc);
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122 bind_program(0);
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123 }
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