| 1 | #include <cstdlib> |
1 | #include <cstdlib> |
| 2 | |
2 | |
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3 | #include <vector> |
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4 | |
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5 | using namespace std; |
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6 | |
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7 | #include "opengl.h" |
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8 | |
| 3 | #include "oct.h" |
9 | #include "oct.h" |
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10 | #include "view.h" |
| 4 | #include "entity.h" |
11 | #include "entity.h" |
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12 | #include "material.h" //DEBUG |
| 5 | |
13 | |
| 6 | octant world(0, 0); |
14 | enum visibility_state { |
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15 | PARTIAL, // surrounding the viewpoint |
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16 | FULL, // in frustum |
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17 | OCCLUDED, // in frustom, but occluded |
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18 | }; |
| 7 | |
19 | |
| 8 | octant::octant (octant *parent, int subindex) |
20 | struct evis { |
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21 | entity *e; |
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22 | visibility_state state; |
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23 | double next; // time of next check |
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24 | |
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25 | void clear () |
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26 | { |
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27 | next = 0.; |
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28 | state = FULL; |
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29 | } |
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30 | |
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31 | evis () |
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32 | { |
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33 | clear (); |
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34 | } |
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35 | }; |
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36 | |
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37 | struct oct_visibility : visibility_base |
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38 | { |
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39 | vector<evis> vismap; |
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40 | |
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41 | visibility_state state; |
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42 | bool vis; |
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43 | |
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44 | evis &get_visibility (int i, entity *e) |
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45 | { |
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46 | evis &evs = vismap [i]; |
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47 | |
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48 | if (evs.e != e) |
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49 | { |
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50 | evs.clear (); |
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51 | evs.e = e; |
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52 | } |
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53 | |
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54 | return evs; |
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55 | } |
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56 | |
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57 | oct_visibility (octant &oct) |
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58 | : state (FULL), vis (true) |
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59 | { |
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60 | } |
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61 | }; |
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62 | |
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63 | octant world(0, sector (0, 0, 0), MAXEXTENT); |
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64 | |
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65 | octant::octant (octant *parent, const sector &orig, uoffs extent) |
| 9 | : parent(parent) |
66 | : parent(parent) |
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67 | , orig(orig) |
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68 | , extent(extent) |
| 10 | { |
69 | { |
| 11 | for (fill = 8; fill--; ) |
70 | for (fill = 8; fill--; ) |
| 12 | sub[fill] = 0; |
71 | sub[fill] = 0; |
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72 | } |
| 13 | |
73 | |
| 14 | if (parent) |
74 | visibility_base *octant::new_visibility () |
| 15 | { |
75 | { |
| 16 | extent = (parent->extent + 1) >> 1; |
76 | return new oct_visibility (*this); |
| 17 | orig = parent->orig; |
77 | } |
| 18 | orig.offset (subindex, extent); |
78 | |
| 19 | } |
79 | void octant::clear_visibility (visibility_base *vs) |
| 20 | else |
80 | { |
| 21 | { |
81 | ((oct_visibility *)vs)->vismap.clear (); |
| 22 | extent = MAXEXTENT; |
82 | ((oct_visibility *)vs)->state = FULL; |
| 23 | orig.x = orig.y = orig.z = SOFFS_MIN; |
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| 24 | } |
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| 25 | } |
83 | } |
| 26 | |
84 | |
| 27 | octant::~octant () |
85 | octant::~octant () |
| 28 | { |
86 | { |
| 29 | for (fill = 8; fill--; ) |
87 | for (fill = 8; fill--; ) |
| 30 | delete sub[fill]; |
88 | delete sub[fill]; |
| 31 | } |
89 | } |
| 32 | |
90 | |
| 33 | static bool overlap (const sector &o1, uoffs ea, const sector &o2, const box &bbox) |
91 | static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b) |
| 34 | { |
92 | { |
| 35 | sector a2; |
93 | sector size = (b - a + 1) >> 1; |
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94 | sector center = a + size; |
| 36 | |
95 | |
| 37 | ea /= 2; |
96 | return abs (orig - center) <= extent + size; |
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97 | } |
| 38 | |
98 | |
| 39 | a2.x = o1.x + ea; |
99 | static sector offset (const sector &s, int subindex, uoffs extent) |
| 40 | a2.y = o1.y + ea; |
100 | { |
| 41 | a2.z = o1.z + ea; |
101 | return sector ( |
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102 | s.x + (subindex & 1 ? extent : -extent), |
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103 | s.y + (subindex & 2 ? extent : -extent), |
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104 | s.z + (subindex & 4 ? extent : -extent) |
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105 | ); |
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106 | } |
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107 | |
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108 | void octant::add (entity *e) |
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109 | { |
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110 | const sector &a = e->a; |
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111 | const sector &b = e->b; |
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112 | |
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113 | uoffs size = max (abs (b - a)); |
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114 | |
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115 | if (size >= extent >> 4) |
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116 | { |
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117 | if (overlap (orig, extent, a, b)) |
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118 | { |
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119 | push_back (e); |
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120 | e->o.push_back (this); |
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121 | } |
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122 | } |
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123 | else |
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124 | { |
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125 | uoffs extent2 = extent >> 1; |
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126 | |
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127 | for (int i = 8; i--; ) |
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128 | { |
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129 | sector s = offset (orig, i, extent2); |
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130 | |
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131 | if (overlap (s, extent2, a, b)) |
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132 | { |
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133 | if (!sub[i]) |
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134 | { |
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135 | sub[i] = new octant (this, s, extent2); |
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136 | fill++; |
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137 | } |
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138 | |
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139 | sub[i]->add (e); |
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140 | } |
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141 | } |
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142 | } |
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143 | } |
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144 | |
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145 | void octant::remove (entity *e) |
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146 | { |
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147 | } |
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148 | |
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149 | bool octant::detect_visibility (view &ctx) //, bool fully_visible) |
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150 | { |
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151 | sector centeri = orig - ctx.orig; |
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152 | point centerf = point (centeri); |
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153 | |
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154 | GLfloat rad = ctx.diagfact * extent; |
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155 | |
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156 | if (!overlap (ctx.frustum.c, sphere (centerf, rad))) |
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157 | return false; |
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158 | |
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159 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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160 | |
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161 | if (max (centeri) < extent) |
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162 | vs.state = PARTIAL; |
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163 | else |
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164 | { |
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165 | if (distance (ctx.frustum.t, centerf) < -rad) return false; |
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166 | if (distance (ctx.frustum.b, centerf) < -rad) return false; |
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167 | if (distance (ctx.frustum.l, centerf) < -rad) return false; |
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168 | if (distance (ctx.frustum.r, centerf) < -rad) return false; |
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169 | if (distance (ctx.frustum.n, centerf) < -rad) return false; |
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170 | } |
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171 | |
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172 | #if 0 |
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173 | GLfloat fd = distance (ctx.frustum.f, centerf); |
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174 | |
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175 | if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
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176 | return false; |
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177 | #endif |
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178 | |
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179 | // very important, optimize? |
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180 | GLfloat z = length (ctx.p - centerf) + rad; |
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181 | if (z < 0.F || ctx.perspfact * extent / z < 10.) // very crude "too small to see" check |
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182 | return false; |
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183 | |
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184 | #if 0 |
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185 | if (vs.state == PARTIAL || vs.state == FULL) |
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186 | ctx.nc_far = max (ctx.nc_far, z); |
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187 | #endif |
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188 | |
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189 | if (vs.state == OCCLUDED) |
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190 | { |
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191 | ctx.postdepthlist.push_back (this); |
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192 | |
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193 | return false; |
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194 | } |
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195 | |
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196 | //bool visible = size () && vs.state != OCCLUDED; |
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197 | bool visible = false; |
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198 | |
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199 | // node to start with |
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200 | unsigned char si = centeri.x > 0 ? 1 : 0 |
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201 | | centeri.y > 0 ? 2 : 0 |
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202 | | centeri.z > 0 ? 4 : 0; |
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203 | |
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204 | // bit-toggle to find next child for front-to-back order |
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205 | static unsigned char toggle[8+1] |
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206 | = { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; |
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207 | |
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208 | unsigned char *next = toggle; |
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209 | do |
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210 | { |
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211 | si ^= *next; |
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212 | |
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213 | if (sub[si]) |
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214 | visible = visible | sub[si]->detect_visibility (ctx); |
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215 | } |
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216 | while (*++next); |
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217 | |
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218 | if (visible) |
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219 | { |
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220 | if (size ()) |
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221 | { |
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222 | ctx.postdepthlist.push_back (this); |
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223 | if (vs.vis) |
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224 | ctx.vislist.push_back (this); |
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225 | } |
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226 | |
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227 | vs.state = FULL; |
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228 | |
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229 | return true; |
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230 | } |
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231 | else if (vs.state == OCCLUDED) |
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232 | { |
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233 | ctx.postdepthlist.push_back (this); |
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234 | |
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235 | return false; |
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236 | } |
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237 | else if (size()) |
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238 | { |
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239 | if (vs.vis) |
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240 | { |
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241 | ctx.postdepthlist.push_back (this); |
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242 | ctx.vislist.push_back (this); |
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243 | } |
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244 | else |
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245 | vs.state = OCCLUDED; |
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246 | |
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247 | return true; |
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248 | } |
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249 | else |
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250 | { |
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251 | return vs.state != PARTIAL; |
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252 | } |
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253 | } |
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254 | |
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255 | void octant::draw_depth (view &ctx) |
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256 | { |
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257 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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258 | |
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259 | vs.vismap.resize (size ()); |
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260 | |
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261 | if (vs.state == OCCLUDED) |
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262 | return; |
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263 | |
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264 | for (int i = 0; i < size (); ++i) |
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265 | { |
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266 | entity *e = (*this)[i]; |
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267 | const evis &evs = vs.get_visibility (i, e); |
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268 | |
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269 | if (evs.state != OCCLUDED) |
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270 | { |
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271 | if (!ctx.may_draw (e)) |
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272 | continue; |
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273 | |
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274 | sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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275 | GLfloat z = length (vec3 (center)); |
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276 | ctx.pixfact = ctx.perspfact / z; |
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277 | |
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278 | ctx.nz_far = max (ctx.nz_far, z + extent); |
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279 | ctx.nz_near = min (ctx.nz_near, z - extent); |
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280 | |
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281 | e->draw (ctx); |
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282 | } |
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283 | } |
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284 | } |
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285 | |
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286 | void octant::draw_postdepth (view &ctx) |
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287 | { |
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288 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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289 | |
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290 | if (vs.state == OCCLUDED || !vs.vis) |
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291 | { |
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292 | ctx.begin_occ_query (*this, 0); |
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293 | sector s = orig - ctx.orig; |
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294 | gl::draw_bbox (s - extent, s + extent); |
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295 | ctx.end_occ_query (); |
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296 | } |
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297 | else |
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298 | { |
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299 | vs.vis = false; |
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300 | |
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301 | for (int i = 0; i < size (); ++i) |
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302 | { |
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303 | entity *e = (*this)[i]; |
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304 | const evis &evs = vs.get_visibility (i, e); |
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305 | |
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306 | if (evs.state == OCCLUDED) |
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307 | { |
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308 | if (!ctx.may_draw (e)) |
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309 | continue; |
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310 | |
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311 | ctx.begin_occ_query (*this, e); |
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312 | gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); |
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313 | ctx.end_occ_query (); |
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314 | } |
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315 | else |
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316 | vs.vis = true; |
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317 | } |
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318 | } |
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319 | } |
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320 | |
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321 | void octant::draw_lighted (view &ctx) |
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322 | { |
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323 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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324 | |
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325 | #if 0 |
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326 | if (vs.state == FULL || vs.state == OCCLUDED) |
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327 | { |
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328 | sector s = orig - ctx.orig; |
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329 | debugmat->enable (ctx); |
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330 | if (max (s) >= extent) |
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331 | gl::draw_bbox (s - extent, s + extent); |
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332 | debugmat->disable (ctx); |
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333 | //printf ("DLP %ld %ld %ld (%ld)\n", orig.x, orig.y, orig.z, extent);//D |
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334 | } |
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335 | #endif |
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336 | |
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337 | if (vs.state == OCCLUDED) |
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338 | return; |
| 42 | |
339 | |
| 43 | sector b2; |
340 | for (int i = 0; i < size (); ++i) |
| 44 | sector eb; |
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| 45 | |
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| 46 | b2.x = o2.x + (soffs)bbox.a.x; |
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| 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 | { |
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| 69 | printf ("overlap, add\n"); |
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| 70 | push_back (e); |
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| 71 | e->o.push_back (this); |
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| 72 | } |
341 | { |
| 73 | else |
342 | entity *e = (*this)[i]; |
| 74 | printf ("no overlap\n"); |
343 | evis &evs = vs.get_visibility (i, e); |
| 75 | } |
|
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| 76 | |
344 | |
| 77 | void octant::remove (entity_base *e) |
345 | if (evs.state != OCCLUDED) |
| 78 | { |
346 | { |
| 79 | } |
347 | if (!ctx.may_draw (e)) |
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348 | continue; |
| 80 | |
349 | |
| 81 | void octant::draw (draw_context &ctx) |
350 | sector center = ((e->a + e->b) >> 1) - ctx.orig; |
| 82 | { |
351 | GLfloat z = length (vec3 (center)); |
| 83 | for (iterator i = end (); i-- != begin (); ) |
352 | ctx.pixfact = ctx.perspfact / z; |
| 84 | (*i)->try_draw (ctx); |
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| 85 | } |
|
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| 86 | |
353 | |
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354 | if (!ctx.first_lighted |
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355 | || evs.next > timer.now) |
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356 | e->draw (ctx); |
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357 | else |
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358 | { |
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359 | evs.next = timer.now + 0.2; |
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360 | ctx.begin_occ_query (*this, e); |
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361 | e->draw (ctx); |
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362 | ctx.end_occ_query (); |
|
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363 | } |
|
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364 | } |
|
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365 | } |
|
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366 | } |
|
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367 | |
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368 | void octant::event (occ_query &ev) |
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369 | { |
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370 | oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); |
|
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371 | entity *e = (entity *)ev.id; |
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372 | |
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373 | if (e) |
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374 | { |
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375 | #if 1 |
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376 | for (vector<evis>::iterator i = vs.vismap.begin (); |
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377 | i != vs.vismap.end (); |
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378 | ++i) |
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379 | if (i->e == e) |
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380 | { |
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381 | i->state = ev.count ? FULL : OCCLUDED; |
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382 | return; |
|
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383 | } |
|
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384 | #endif |
|
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385 | } |
|
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386 | else |
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387 | { |
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388 | vs.state = ev.count ? FULL : OCCLUDED; |
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389 | vs.vis = ev.count ? true : false; |
|
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390 | } |
|
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391 | } |
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392 | |
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393 | |
