| 1 | #include <cstdlib> |
1 | #include <cstdlib> |
| 2 | |
2 | |
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3 | #include <vector> |
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4 | using namespace std; |
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5 | |
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6 | #include "opengl.h" |
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7 | |
| 3 | #include "oct.h" |
8 | #include "oct.h" |
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9 | #include "view.h" |
| 4 | #include "entity.h" |
10 | #include "entity.h" |
| 5 | |
11 | |
| 6 | octant world(0, 0); |
12 | enum visibility_state { FULL, PARTIAL, SMALL, OCCLUDED }; |
| 7 | |
13 | |
| 8 | octant::octant (octant *parent, int subindex) |
14 | struct evis { |
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15 | visibility_state state; |
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16 | double last; // time of last check |
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17 | evis () : last(0.), state(FULL) { }; |
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18 | }; |
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19 | |
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20 | struct oct_visibility : visibility_base |
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21 | { |
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22 | typedef map<entity *, evis> evismap; |
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23 | evismap vismap; |
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24 | |
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25 | visibility_state state; |
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26 | |
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27 | oct_visibility (octant &oct) |
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28 | : state(FULL) |
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29 | { |
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30 | } |
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31 | }; |
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32 | |
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33 | octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT); |
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34 | |
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35 | octant::octant (octant *parent, const sector &orig, uoffs extent) |
| 9 | : parent(parent) |
36 | : parent(parent) |
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37 | , orig(orig) |
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38 | , extent(extent) |
| 10 | { |
39 | { |
| 11 | for (fill = 8; fill--; ) |
40 | for (fill = 8; fill--; ) |
| 12 | sub[fill] = 0; |
41 | sub[fill] = 0; |
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42 | } |
| 13 | |
43 | |
| 14 | if (parent) |
44 | visibility_base *octant::new_visibility () |
| 15 | { |
45 | { |
| 16 | extent = (parent->extent + 1) >> 1; |
46 | return new oct_visibility (*this); |
| 17 | orig = parent->orig; |
47 | } |
| 18 | orig.offset (subindex, extent); |
48 | |
| 19 | } |
49 | void octant::clear_visibility (visibility_base *vs) |
| 20 | else |
50 | { |
| 21 | { |
51 | ((oct_visibility *)vs)->vismap.clear (); |
| 22 | extent = MAXEXTENT; |
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| 23 | orig.x = orig.y = orig.z = SOFFS_MIN; |
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| 24 | } |
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| 25 | } |
52 | } |
| 26 | |
53 | |
| 27 | octant::~octant () |
54 | octant::~octant () |
| 28 | { |
55 | { |
| 29 | for (fill = 8; fill--; ) |
56 | for (fill = 8; fill--; ) |
| 30 | delete sub[fill]; |
57 | delete sub[fill]; |
| 31 | } |
58 | } |
| 32 | |
59 | |
| 33 | static bool overlap (const sector &o1, uoffs ea, const sector &o2, const box &bbox) |
60 | static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b) |
| 34 | { |
61 | { |
| 35 | sector a2; |
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| 36 | |
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| 37 | ea /= 2; |
62 | ea /= 2; |
| 38 | |
63 | |
| 39 | a2.x = o1.x + ea; |
64 | sector center_1 = o1 + ea; |
| 40 | a2.y = o1.y + ea; |
65 | sector size_2 = b - a; |
| 41 | a2.z = o1.z + ea; |
66 | sector center_2 = a + (size_2 >> 1); |
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67 | |
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68 | return abs (center_1 - center_2) <= ea + size_2; |
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69 | } |
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70 | |
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71 | void octant::add (entity *e) |
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72 | { |
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73 | const sector &a = e->a; |
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74 | const sector &b = e->b; |
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75 | |
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76 | if (overlap (orig, extent, a, b)) |
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77 | { |
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78 | uoffs extent2 = extent >> 1; |
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79 | uoffs size = max (abs (b - a)); |
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80 | |
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81 | if (size >= extent2 >> 1) |
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82 | { |
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83 | push_back (e); |
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84 | e->o.push_back (this); |
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85 | return; |
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86 | } |
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87 | |
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88 | for (int i = 8; i--; ) |
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89 | { |
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90 | sector s = orig; |
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91 | s.offset (i, extent2); |
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92 | |
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93 | if (overlap (s, extent2, a, b)) |
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94 | { |
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95 | if (!sub[i]) |
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96 | { |
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97 | sub[i] = new octant (this, s, extent2); |
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98 | fill++; |
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99 | } |
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100 | |
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101 | sub[i]->add (e); |
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102 | } |
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103 | } |
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104 | } |
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105 | } |
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106 | |
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107 | void octant::remove (entity *e) |
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108 | { |
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109 | } |
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110 | |
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111 | bool octant::detect_visibility (view &ctx) |
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112 | { |
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113 | GLfloat extent2 = 0.5F * (GLfloat)extent; |
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114 | sector centeri = orig + (extent >> 1) - ctx.orig; |
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115 | point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F); |
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116 | |
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117 | GLfloat rad = ctx.diagfact * extent2; |
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118 | |
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119 | if (!overlap (ctx.frustum.c, sphere (centerf, rad))) |
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120 | return false; |
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121 | |
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122 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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123 | |
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124 | if (orig <= ctx.orig && ctx.orig <= orig + extent) |
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125 | vs.state = PARTIAL; |
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126 | else |
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127 | { |
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128 | if (distance (ctx.frustum.t, centerf) < -rad) return false; |
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129 | if (distance (ctx.frustum.b, centerf) < -rad) return false; |
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130 | if (distance (ctx.frustum.l, centerf) < -rad) return false; |
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131 | if (distance (ctx.frustum.r, centerf) < -rad) return false; |
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132 | if (distance (ctx.frustum.n, centerf) < -rad) return false; |
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133 | |
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134 | #if 0 |
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135 | GLfloat fd = distance (ctx.frustum.f, centerf); |
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136 | |
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137 | if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
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138 | return false; |
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139 | #endif |
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140 | } |
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141 | |
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142 | #if 0 |
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143 | if (vs.state == OCCLUDED) |
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144 | { |
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145 | if (size ()) |
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146 | ctx.vislist.push_back (this); |
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147 | //return false; |
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148 | } |
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149 | #endif |
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150 | |
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151 | GLfloat z = ctx.z_near + distance (ctx.frustum.n, centerf) + rad; |
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152 | if (ctx.perspfact * extent / z < 1.) // very crude "too small to see" check |
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153 | return false; |
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154 | //printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z); |
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155 | |
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156 | #if 0 |
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157 | if (vs.state == PARTIAL || vs.state == FULL) |
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158 | ctx.nc_far = max (ctx.nc_far, z); |
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159 | #endif |
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160 | |
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161 | // node to start with |
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162 | unsigned char si = centeri.x > 0 ? 1 : 0 |
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163 | | centeri.y > 0 ? 2 : 0 |
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164 | | centeri.z > 0 ? 4 : 0; |
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165 | |
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166 | // bit-toggle to find next child for front-to-back order |
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167 | static unsigned char toggle[8+1] |
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168 | = { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; |
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169 | |
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170 | unsigned char *next = toggle; |
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171 | do |
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172 | { |
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173 | si ^= *next; |
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174 | |
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175 | if (sub[si]) |
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176 | sub[si]->detect_visibility (ctx); |
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177 | } |
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178 | while (*++next); |
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179 | |
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180 | if (size () |
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181 | && (vs.state == PARTIAL || vs.state == FULL || vs.state == OCCLUDED)) |
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182 | ctx.vislist.push_back (this); |
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183 | |
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184 | return true; |
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185 | } |
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186 | |
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187 | void octant::display (view &ctx) |
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188 | { |
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189 | #if 0 |
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190 | sector s = orig - ctx.orig; |
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191 | |
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192 | glBegin (GL_LINES); |
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193 | vec3 clr(0, 0.8, 0); |
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194 | glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr); |
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195 | |
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196 | for (int i = 8; i--; ) |
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197 | for (int ji = 3; ji--; ) |
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198 | { |
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199 | int j = i | (1 << ji); |
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200 | if (i < j) |
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201 | { |
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202 | glVertex3i (s.x + !!(i & 1) * extent, |
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203 | s.y + !!(i & 2) * extent, |
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204 | s.z + !!(i & 4) * extent); |
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205 | glVertex3i (s.x + !!(j & 1) * extent, |
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206 | s.y + !!(j & 2) * extent, |
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207 | s.z + !!(j & 4) * extent); |
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208 | } |
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209 | } |
| 42 | |
210 | |
| 43 | sector b2; |
211 | glEnd (); |
| 44 | sector eb; |
212 | #endif |
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213 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
| 45 | |
214 | |
| 46 | b2.x = o2.x + (soffs)bbox.a.x; |
215 | if (vs.state == OCCLUDED) |
| 47 | b2.y = o2.y + (soffs)bbox.a.y; |
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| 48 | b2.z = o2.z + (soffs)bbox.a.z; |
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| 49 | |
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| 50 | eb.x = (soffs)(bbox.b.x - bbox.a.x) / 2; |
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| 51 | eb.y = (soffs)(bbox.b.y - bbox.a.y) / 2; |
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| 52 | eb.z = (soffs)(bbox.b.z - bbox.a.z) / 2; |
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| 53 | |
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| 54 | b2.x += eb.x; |
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| 55 | b2.y += eb.y; |
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| 56 | b2.z += eb.z; |
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| 57 | |
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| 58 | return abs (a2.x - b2.x) <= ea + eb.x |
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| 59 | && abs (a2.y - b2.y) <= ea + eb.y |
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| 60 | && abs (a2.z - b2.z) <= ea + eb.z; |
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| 61 | } |
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| 62 | |
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| 63 | void octant::add (const sector &sec, entity_base *e) |
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| 64 | { |
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| 65 | printf ("OCTANT %d,%d,%d+%d\n", orig.x, orig.y, orig.z, extent); |
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| 66 | |
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| 67 | if (overlap (orig, extent, sec, e->bbox)) |
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| 68 | { |
216 | { |
| 69 | printf ("overlap, add\n"); |
217 | if (ctx.pass == view::POSTDEPTH) |
| 70 | push_back (e); |
218 | { |
| 71 | e->o.push_back (this); |
219 | ctx.begin_occ_query (*this, 0); |
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220 | sector s = orig - ctx.orig; |
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221 | gl::draw_bbox (s, s + extent); |
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222 | ctx.end_occ_query (); |
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223 | } |
| 72 | } |
224 | } |
| 73 | else |
225 | else |
| 74 | printf ("no overlap\n"); |
226 | { |
| 75 | } |
227 | int nvis = 0; |
| 76 | |
228 | |
| 77 | void octant::remove (entity_base *e) |
229 | for (iterator i = begin (); i != end (); ) |
| 78 | { |
230 | { |
| 79 | } |
231 | entity *e = *i++; |
| 80 | |
232 | |
| 81 | void octant::draw (draw_context &ctx) |
233 | evis &evs = vs.vismap[e]; |
| 82 | { |
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| 83 | for (iterator i = end (); i-- != begin (); ) |
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| 84 | (*i)->try_draw (ctx); |
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| 85 | } |
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| 86 | |
234 | |
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235 | if (ctx.pass == view::POSTDEPTH) |
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236 | { |
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237 | if (evs.state == OCCLUDED) |
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238 | { |
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239 | ctx.begin_occ_query (*this, e); |
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240 | gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); |
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241 | ctx.end_occ_query (); |
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242 | } |
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243 | else |
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244 | nvis++; |
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245 | } |
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246 | else |
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247 | { |
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248 | if (!ctx.may_draw (e)) |
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249 | continue; |
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250 | |
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251 | |
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252 | if (evs.state != OCCLUDED) |
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253 | { |
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254 | sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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255 | GLfloat z = length (vec3 (center)); |
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256 | ctx.pixfact = ctx.perspfact / z; |
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257 | |
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258 | ctx.nz_far = max (ctx.nz_far, z + extent); |
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259 | ctx.nz_near = min (ctx.nz_near, z - extent); |
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260 | |
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261 | if (ctx.pass == view::DEPTH || evs.last + 0.3 > timer.now) |
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262 | e->draw (ctx); |
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263 | else |
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264 | { |
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265 | evs.last = timer.now; |
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266 | ctx.begin_occ_query (*this, e); |
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267 | e->draw (ctx); |
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268 | ctx.end_occ_query (); |
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269 | } |
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270 | } |
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271 | } |
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272 | } |
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273 | |
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274 | #if 1 |
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275 | if (ctx.pass == view::POSTDEPTH && nvis == 0 && size ()) |
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276 | vs.state = OCCLUDED; |
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277 | #endif |
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278 | } |
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279 | } |
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280 | |
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281 | void octant::event (occ_query &ev) |
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282 | { |
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283 | oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); |
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284 | entity *e = (entity *)ev.id; |
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285 | |
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286 | if (e) |
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287 | { |
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288 | evis &evs = vs.vismap[e]; |
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289 | evs.state = ev.count ? FULL : OCCLUDED; |
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290 | } |
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291 | else |
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292 | vs.state = ev.count ? FULL : OCCLUDED; |
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293 | } |
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294 | |
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295 | |
