| 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, OCCLUDED }; |
| 7 | |
13 | |
| 8 | octant::octant (octant *parent, int subindex) |
14 | struct evis { |
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15 | entity *e; |
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16 | visibility_state state; |
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17 | double last; // time of last check |
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18 | |
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19 | void clear () |
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20 | { |
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21 | last = 0.; |
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22 | state = FULL; |
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23 | } |
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24 | |
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25 | evis () |
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26 | { |
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27 | clear (); |
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28 | } |
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29 | }; |
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30 | |
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31 | struct oct_visibility : visibility_base |
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32 | { |
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33 | vector<evis> vismap; |
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34 | |
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35 | visibility_state state; |
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36 | |
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37 | evis &get_visibility (int i, entity *e) |
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38 | { |
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39 | evis &evs = vismap [i]; |
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40 | |
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41 | if (evs.e != e) |
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42 | { |
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43 | evs.clear (); |
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44 | evs.e = e; |
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45 | } |
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46 | |
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47 | return evs; |
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48 | } |
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49 | |
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50 | oct_visibility (octant &oct) |
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51 | : state(FULL) |
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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 | octant world(0, sector (0, 0, 0), MAXEXTENT); |
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57 | |
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58 | octant::octant (octant *parent, const sector &orig, uoffs extent) |
| 9 | : parent(parent) |
59 | : parent(parent) |
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60 | , orig(orig) |
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61 | , extent(extent) |
| 10 | { |
62 | { |
| 11 | for (fill = 8; fill--; ) |
63 | for (fill = 8; fill--; ) |
| 12 | sub[fill] = 0; |
64 | sub[fill] = 0; |
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65 | } |
| 13 | |
66 | |
| 14 | if (parent) |
67 | visibility_base *octant::new_visibility () |
| 15 | { |
68 | { |
| 16 | extent = (parent->extent + 1) >> 1; |
69 | return new oct_visibility (*this); |
| 17 | orig = parent->orig; |
70 | } |
| 18 | orig.offset (subindex, extent); |
71 | |
| 19 | } |
72 | void octant::clear_visibility (visibility_base *vs) |
| 20 | else |
73 | { |
| 21 | { |
74 | ((oct_visibility *)vs)->vismap.clear (); |
| 22 | extent = MAXEXTENT; |
75 | ((oct_visibility *)vs)->state = FULL; |
| 23 | orig.x = orig.y = orig.z = SOFFS_MIN; |
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| 24 | } |
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| 25 | } |
76 | } |
| 26 | |
77 | |
| 27 | octant::~octant () |
78 | octant::~octant () |
| 28 | { |
79 | { |
| 29 | for (fill = 8; fill--; ) |
80 | for (fill = 8; fill--; ) |
| 30 | delete sub[fill]; |
81 | delete sub[fill]; |
| 31 | } |
82 | } |
| 32 | |
83 | |
| 33 | static bool overlap (const sector &o1, uoffs ea, const sector &o2, const box &bbox) |
84 | static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b) |
| 34 | { |
85 | { |
| 35 | sector a2; |
86 | sector size = (b - a + 1) >> 1; |
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87 | sector center = a + size; |
| 36 | |
88 | |
| 37 | ea /= 2; |
89 | return abs (orig - center) <= extent + size; |
| 38 | |
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| 39 | a2.x = o1.x + ea; |
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| 40 | a2.y = o1.y + ea; |
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| 41 | a2.z = o1.z + ea; |
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| 42 | |
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| 43 | sector b2; |
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| 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 | } |
90 | } |
| 62 | |
91 | |
| 63 | void octant::add (const sector &sec, entity_base *e) |
92 | static sector offset (const sector &s, int subindex, uoffs extent) |
| 64 | { |
93 | { |
| 65 | printf ("OCTANT %d,%d,%d+%d\n", orig.x, orig.y, orig.z, extent); |
94 | return sector ( |
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95 | s.x + (subindex & 1 ? extent : -extent), |
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96 | s.y + (subindex & 2 ? extent : -extent), |
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97 | s.z + (subindex & 4 ? extent : -extent) |
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98 | ); |
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99 | } |
| 66 | |
100 | |
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101 | void octant::add (entity *e) |
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102 | { |
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103 | const sector &a = e->a; |
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104 | const sector &b = e->b; |
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105 | |
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106 | uoffs size = max (abs (b - a)); |
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107 | |
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108 | if (size >= extent >> 4) |
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109 | { |
| 67 | if (overlap (orig, extent, sec, e->bbox)) |
110 | if (overlap (orig, extent, a, b)) |
| 68 | { |
111 | { |
| 69 | printf ("overlap, add\n"); |
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| 70 | push_back (e); |
112 | push_back (e); |
| 71 | e->o.push_back (this); |
113 | e->o.push_back (this); |
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114 | } |
| 72 | } |
115 | } |
| 73 | else |
116 | else |
| 74 | printf ("no overlap\n"); |
117 | { |
| 75 | } |
118 | uoffs extent2 = extent >> 1; |
| 76 | |
119 | |
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120 | for (int i = 8; i--; ) |
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121 | { |
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122 | sector s = offset (orig, i, extent2); |
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123 | |
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124 | if (overlap (s, extent2, a, b)) |
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125 | { |
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126 | if (!sub[i]) |
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127 | { |
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128 | sub[i] = new octant (this, s, extent2); |
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129 | fill++; |
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130 | } |
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131 | |
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132 | sub[i]->add (e); |
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133 | } |
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134 | } |
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135 | } |
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136 | } |
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137 | |
| 77 | void octant::remove (entity_base *e) |
138 | void octant::remove (entity *e) |
| 78 | { |
139 | { |
| 79 | } |
140 | } |
| 80 | |
141 | |
| 81 | void octant::draw (draw_context &ctx) |
142 | bool octant::detect_visibility (view &ctx) //, bool fully_visible) |
| 82 | { |
143 | { |
| 83 | for (iterator i = end (); i-- != begin (); ) |
144 | ctx.stat1++;//D |
| 84 | (*i)->try_draw (ctx); |
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| 85 | } |
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| 86 | |
145 | |
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146 | sector centeri = orig - ctx.orig; |
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147 | point centerf = point (centeri); |
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148 | |
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149 | GLfloat rad = ctx.diagfact * extent; |
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150 | |
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151 | if (!overlap (ctx.frustum.c, sphere (centerf, rad))) |
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152 | return false; |
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153 | |
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154 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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155 | |
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156 | //vs.state = FULL;//D |
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157 | |
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158 | #if 0 |
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159 | if (max (abs (centeri)) <= extent) |
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160 | ; |
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161 | else |
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162 | { |
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163 | #endif |
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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 | #if 0 |
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172 | GLfloat fd = distance (ctx.frustum.f, centerf); |
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173 | |
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174 | if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
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175 | return false; |
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176 | #endif |
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177 | |
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178 | // very important, optimize? |
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179 | GLfloat z = length (ctx.p - centerf) + rad; |
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180 | if (z < 0.F || ctx.perspfact * extent / z < 10.) // very crude "too small to see" check |
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181 | return false; |
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182 | |
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183 | #if 0 |
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184 | if (vs.state == PARTIAL || vs.state == FULL) |
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185 | ctx.nc_far = max (ctx.nc_far, z); |
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186 | #endif |
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187 | |
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188 | if (vs.state == OCCLUDED) |
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189 | { |
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190 | #if 0 |
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191 | if (extent < ctx.z_far) |
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192 | { |
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193 | #endif |
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194 | ctx.postdepthlist.push_back (this); |
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195 | return false; |
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196 | #if 0 |
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197 | } |
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198 | else |
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199 | vs.state == PARTIAL; |
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200 | #endif |
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201 | } |
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202 | |
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203 | bool visible = size () && vs.state == FULL; |
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204 | |
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205 | // node to start with |
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206 | unsigned char si = centeri.x > 0 ? 1 : 0 |
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207 | | centeri.y > 0 ? 2 : 0 |
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208 | | centeri.z > 0 ? 4 : 0; |
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209 | |
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210 | // bit-toggle to find next child for front-to-back order |
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211 | static unsigned char toggle[8+1] |
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212 | = { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; |
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213 | |
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214 | unsigned char *next = toggle; |
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215 | do |
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216 | { |
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217 | si ^= *next; |
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218 | |
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219 | if (sub[si]) |
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220 | visible = visible | sub[si]->detect_visibility (ctx); |
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221 | } |
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222 | while (*++next); |
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223 | |
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224 | if (visible) |
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225 | { |
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226 | if (size ()) |
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227 | ctx.vislist.push_back (this); |
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228 | |
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229 | ctx.postdepthlist.push_back (this); |
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230 | } |
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231 | else |
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232 | { |
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233 | //vs.state = OCCLUDED; |
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234 | ctx.postdepthlist.push_back (this); |
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235 | } |
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236 | |
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237 | return visible; |
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238 | } |
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239 | |
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240 | void octant::draw_depth (view &ctx) |
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241 | { |
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242 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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243 | |
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244 | vs.vismap.resize (size ()); |
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245 | |
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246 | if (vs.state == PARTIAL || vs.state == OCCLUDED) |
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247 | return; |
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248 | |
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249 | for (int i = 0; i < size (); ++i) |
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250 | { |
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251 | entity *e = (*this)[i]; |
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252 | const evis &evs = vs.get_visibility (i, e); |
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253 | |
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254 | if (evs.state != OCCLUDED) |
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255 | { |
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256 | if (!ctx.may_draw (e)) |
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257 | continue; |
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258 | |
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259 | sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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260 | GLfloat z = length (vec3 (center)); |
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261 | ctx.pixfact = ctx.perspfact / z; |
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262 | |
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263 | ctx.nz_far = max (ctx.nz_far, z + extent); |
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264 | ctx.nz_near = min (ctx.nz_near, z - extent); |
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265 | |
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266 | e->draw (ctx); |
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267 | } |
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268 | } |
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269 | } |
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270 | |
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271 | void octant::draw_postdepth (view &ctx) |
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272 | { |
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273 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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274 | |
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275 | if (vs.state == PARTIAL || vs.state == OCCLUDED) |
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276 | { |
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277 | ctx.begin_occ_query (*this, 0); |
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278 | sector s = orig - ctx.orig; |
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279 | gl::draw_bbox (s - extent, s + extent); |
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280 | ctx.end_occ_query (); |
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281 | } |
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282 | else |
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283 | { |
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284 | int nvis = 0; |
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285 | |
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286 | for (int i = 0; i < size (); ++i) |
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287 | { |
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288 | entity *e = (*this)[i]; |
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289 | const evis &evs = vs.get_visibility (i, e); |
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290 | |
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291 | if (evs.state == OCCLUDED) |
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292 | { |
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293 | if (!ctx.may_draw (e)) |
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294 | continue; |
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295 | |
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296 | ctx.begin_occ_query (*this, e); |
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297 | gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); |
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298 | ctx.end_occ_query (); |
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299 | } |
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300 | else |
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301 | nvis++; |
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302 | } |
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303 | |
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304 | #if 0 |
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305 | if (nvis == 0 && size ()) |
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306 | vs.state = PARTIAL; |
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307 | #endif |
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308 | } |
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309 | } |
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310 | |
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311 | void octant::draw_lighted (view &ctx) |
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312 | { |
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313 | oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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314 | |
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315 | #if 0 |
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316 | if (vs.state == PARTIAL || vs.state == OCCLUDED) |
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317 | { |
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318 | sector s = orig - ctx.orig; |
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319 | gl::draw_bbox (s - extent, s + extent); |
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320 | printf ("DLP %p\n", this);//D |
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321 | } |
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322 | #endif |
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323 | |
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324 | if (vs.state == PARTIAL || vs.state == OCCLUDED) |
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325 | return; |
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326 | |
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327 | #if 0 |
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328 | { |
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329 | static vertex_buffer vb; |
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330 | static index_buffer ib; |
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331 | |
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332 | sector s = orig - ctx.orig; |
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333 | sector a = s - extent, b = s + extent; |
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334 | |
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335 | vertex_v3f vd[] = { |
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336 | point (a.x, a.y, a.z), |
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337 | point (b.x, a.y, a.z), |
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338 | point (a.x, b.y, a.z), |
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339 | point (b.x, b.y, a.z), |
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340 | point (a.x, a.y, b.z), |
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341 | point (b.x, a.y, b.z), |
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342 | point (a.x, b.y, b.z), |
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343 | point (b.x, b.y, b.z), |
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344 | }; |
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345 | |
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346 | if (!ib) |
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347 | { |
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348 | static GLushort verts[4*6] = { |
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349 | 0, 4, 6, 2, // -x |
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350 | 1, 3, 7, 5, // +x |
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351 | 0, 1, 5, 4, // -y |
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352 | 7, 3, 2, 6, // +y |
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353 | 0, 2, 3, 1, // -z |
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354 | 4, 5, 7, 6, // +z |
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355 | }; |
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356 | |
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357 | ib.set (verts, 4*6, GL_STATIC_DRAW_ARB); |
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358 | } |
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359 | |
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360 | vb.set (vd, 8, GL_STREAM_DRAW_ARB); |
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361 | vb.bind (); |
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362 | for (int i = 0; i < 6; i++) |
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363 | ib.draw (GL_LINE_LOOP, i*4, 4); |
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364 | |
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365 | } |
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366 | #endif |
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367 | |
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368 | for (int i = 0; i < size (); ++i) |
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369 | { |
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370 | entity *e = (*this)[i]; |
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371 | evis &evs = vs.get_visibility (i, e); |
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372 | |
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373 | if (evs.state != OCCLUDED) |
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374 | { |
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375 | if (!ctx.may_draw (e)) |
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376 | continue; |
|
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377 | |
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378 | sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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379 | GLfloat z = length (vec3 (center)); |
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380 | ctx.pixfact = ctx.perspfact / z; |
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381 | |
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382 | if (ctx.pass->type != LIGHTED |
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383 | || !ctx.first_lighted |
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384 | || evs.last + 1. > timer.now) |
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385 | e->draw (ctx); |
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386 | else |
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387 | { |
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388 | evs.last = timer.now; |
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389 | ctx.begin_occ_query (*this, e); |
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390 | e->draw (ctx); |
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391 | ctx.end_occ_query (); |
|
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392 | } |
|
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393 | } |
|
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394 | } |
|
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395 | } |
|
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396 | |
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397 | void octant::event (occ_query &ev) |
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398 | { |
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399 | oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); |
|
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400 | entity *e = (entity *)ev.id; |
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401 | |
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402 | if (e) |
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403 | { |
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404 | for (vector<evis>::iterator i = vs.vismap.begin (); |
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405 | i != vs.vismap.end (); |
|
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406 | ++i) |
|
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407 | if (i->e == e) |
|
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408 | { |
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409 | i->state = ev.count ? FULL : OCCLUDED; |
|
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410 | return; |
|
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411 | } |
|
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412 | } |
|
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413 | else |
|
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414 | vs.state = ev.count ? (vs.state == PARTIAL ? PARTIAL : FULL) : OCCLUDED; |
|
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415 | } |
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416 | |
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417 | |
