| 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 | #define GL_GLEXT_PROTOTYPES |
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8 | #include <GL/gl.h> |
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9 | #include <GL/glext.h> |
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10 | |
| 3 | #include "oct.h" |
11 | #include "oct.h" |
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12 | #include "view.h" |
| 4 | #include "entity.h" |
13 | #include "entity.h" |
| 5 | |
14 | |
| 6 | octant world(0, 0); |
15 | vector<GLuint> occ_query_objects; |
| 7 | |
16 | |
| 8 | octant::octant (octant *parent, int subindex) |
17 | static GLuint begin_occ_query () |
| 9 | : parent(parent) |
18 | { |
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19 | GLuint id; |
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20 | |
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21 | if (occ_query_objects.size ()) |
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22 | { |
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23 | id = *(occ_query_objects.end () - 1); |
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24 | occ_query_objects.pop_back (); |
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25 | } |
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26 | else |
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27 | glGenQueriesARB (1, &id); |
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28 | |
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29 | glBeginQueryARB (GL_SAMPLES_PASSED, id); |
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30 | return id; |
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31 | } |
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32 | |
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33 | #define end_occ_query() glEndQueryARB (GL_SAMPLES_PASSED) |
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34 | |
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35 | GLuint occ_query_result (GLuint id) |
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36 | { |
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37 | GLuint count; |
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38 | |
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39 | glGetQueryObjectuivARB (id, GL_QUERY_RESULT, &count); |
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40 | occ_query_objects.push_back (id); |
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41 | |
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42 | return count; |
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43 | } |
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44 | |
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45 | octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT); |
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46 | |
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47 | octant::octant (octant *parent, const sector &orig, uoffs extent) |
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48 | : parent(parent), orig(orig), extent(extent) |
| 10 | { |
49 | { |
| 11 | for (fill = 8; fill--; ) |
50 | for (fill = 8; fill--; ) |
| 12 | sub[fill] = 0; |
51 | sub[fill] = 0; |
| 13 | |
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| 14 | if (parent) |
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| 15 | { |
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| 16 | extent = (parent->extent + 1) >> 1; |
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| 17 | orig = parent->orig; |
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| 18 | orig.offset (subindex, extent); |
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| 19 | } |
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| 20 | else |
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| 21 | { |
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| 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 box &bbox) |
| 34 | { |
61 | { |
| 35 | sector a2; |
62 | sector a2, b2; |
| 36 | |
63 | |
| 37 | ea /= 2; |
64 | ea /= 2; |
| 38 | |
65 | |
| 39 | a2.x = o1.x + ea; |
66 | a2.x = o1.x + ea; |
| 40 | a2.y = o1.y + ea; |
67 | a2.y = o1.y + ea; |
| 41 | a2.z = o1.z + ea; |
68 | a2.z = o1.z + ea; |
| 42 | |
69 | |
| 43 | sector b2; |
70 | b2.x = (bbox.a.x + bbox.b.x) / 2; |
| 44 | sector eb; |
71 | b2.y = (bbox.a.y + bbox.b.y) / 2; |
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72 | b2.z = (bbox.a.z + bbox.b.z) / 2; |
| 45 | |
73 | |
| 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 |
74 | return abs (a2.x - b2.x) <= ea + (bbox.b.x - bbox.a.x) |
| 59 | && abs (a2.y - b2.y) <= ea + eb.y |
75 | && abs (a2.y - b2.y) <= ea + (bbox.b.y - bbox.a.y) |
| 60 | && abs (a2.z - b2.z) <= ea + eb.z; |
76 | && abs (a2.z - b2.z) <= ea + (bbox.b.z - bbox.a.z); |
| 61 | } |
77 | } |
| 62 | |
78 | |
| 63 | void octant::add (const sector &sec, entity_base *e) |
79 | void octant::add (entity_base *e) |
| 64 | { |
80 | { |
| 65 | printf ("OCTANT %d,%d,%d+%d\n", orig.x, orig.y, orig.z, extent); |
81 | box bbox = translate (e->bbox, e->orig, sector (0, 0, 0)); |
| 66 | |
82 | |
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83 | uoffs size = max (abs (bbox.b.x - bbox.a.x), |
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84 | max (abs (bbox.b.y - bbox.a.y), |
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85 | abs (bbox.b.z - bbox.a.z))); |
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86 | |
| 67 | if (overlap (orig, extent, sec, e->bbox)) |
87 | if (overlap (orig, extent, bbox)) |
| 68 | { |
88 | { |
| 69 | printf ("overlap, add\n"); |
89 | uoffs extent2 = extent / 2; |
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90 | |
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91 | if (size > extent2 || !extent2) |
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92 | { |
| 70 | push_back (e); |
93 | push_back (e); |
| 71 | e->o.push_back (this); |
94 | e->o.push_back (this); |
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95 | return; |
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96 | } |
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97 | |
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98 | for (int i = 8; i--; ) |
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99 | { |
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100 | sector s = orig; |
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101 | s.offset (i, extent2); |
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102 | if (overlap (s, extent2, bbox)) |
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103 | { |
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104 | if (!sub[i]) |
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105 | sub[i] = new octant (this, s, extent2); |
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106 | |
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107 | sub[i]->add (e); |
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108 | } |
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109 | } |
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110 | } |
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111 | } |
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112 | |
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113 | void octant::remove (entity_base *e) |
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114 | { |
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115 | } |
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116 | |
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117 | void octant::detect_visibility (view &ctx) |
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118 | { |
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119 | visibility_state &vs = ctx.vismap[this]; |
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120 | |
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121 | if (vs.generation != ctx.generation) |
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122 | vs.visibility = visibility_state::UNKNOWN; |
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123 | |
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124 | const sector &cam = ctx.orig; |
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125 | if (cam.x >= orig.x && cam.x <= orig.x + extent |
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126 | && cam.y >= orig.y && cam.y <= orig.y + extent |
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127 | && cam.z >= orig.z && cam.z <= orig.z + extent) |
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128 | { |
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129 | vs.visibility = visibility_state::PARTIAL; |
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130 | vs.generation = ctx.generation; |
| 72 | } |
131 | } |
| 73 | else |
132 | else |
| 74 | printf ("no overlap\n"); |
133 | { |
| 75 | } |
134 | point center ( |
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135 | orig.x + (soffs)extent / 2 - cam.x, |
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136 | orig.y + (soffs)extent / 2 - cam.y, |
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137 | orig.z + (soffs)extent / 2 - cam.z |
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138 | ); |
| 76 | |
139 | |
| 77 | void octant::remove (entity_base *e) |
140 | GLfloat dia = (0.5 * sqrtf (3))*(GLfloat)extent; |
| 78 | { |
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| 79 | } |
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| 80 | |
141 | |
| 81 | void octant::draw (draw_context &ctx) |
142 | if (ctx.frustum.t.distance (center) < -dia) return; |
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143 | if (ctx.frustum.b.distance (center) < -dia) return; |
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144 | if (ctx.frustum.l.distance (center) < -dia) return; |
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145 | if (ctx.frustum.r.distance (center) < -dia) return; |
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146 | if (ctx.frustum.n.distance (center) < -dia) return; |
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147 | |
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148 | GLfloat fd = ctx.frustum.f.distance (center); |
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149 | |
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150 | if (fd < -dia) |
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151 | { |
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152 | if (fd < -dia * 2) |
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153 | return; |
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154 | |
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155 | // cull, but do check for potential visibility |
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156 | if (size ()) |
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157 | ctx.farlist.push_back (this); |
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158 | } |
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159 | } |
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160 | |
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161 | if (size ()) |
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162 | ctx.vislist.push_back (this); |
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163 | |
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164 | // node to start with |
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165 | unsigned char si = ctx.d.x < 0 ? 1 : 0 |
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166 | | ctx.d.y < 0 ? 2 : 0 |
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167 | | ctx.d.z < 0 ? 4 : 0; |
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168 | |
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169 | // bit-toggle to find next child for front-to-back order |
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170 | static unsigned char next[8] |
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171 | = { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7 }; |
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172 | |
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173 | for (int i = 0; i < 8; i++) |
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174 | { |
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175 | si ^= next[i]; |
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176 | |
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177 | if (sub[si]) |
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178 | sub[si]->detect_visibility (ctx); |
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179 | } |
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180 | |
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181 | vs.generation = ctx.generation; |
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182 | } |
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183 | |
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184 | void octant::display (view &ctx) |
| 82 | { |
185 | { |
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186 | #if 0 |
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187 | glBegin (GL_LINES); |
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188 | sector s = orig - ctx.orig; |
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189 | vec3 clr(0, 0.8, 0); |
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190 | glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr); |
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191 | |
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192 | for (int i = 8; i--; ) |
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193 | for (int ji = 3; ji--; ) |
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194 | { |
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195 | int j = i | (1 << ji); |
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196 | if (i != j) |
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197 | { |
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198 | glVertex3i (s.x + !!(i & 1) * extent, |
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199 | s.y + !!(i & 2) * extent, |
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200 | s.z + !!(i & 4) * extent); |
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201 | glVertex3i (s.x + !!(j & 1) * extent, |
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202 | s.y + !!(j & 2) * extent, |
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203 | s.z + !!(j & 4) * extent); |
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204 | } |
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205 | } |
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206 | |
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207 | glEnd (); |
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208 | glDisable(GL_COLOR_MATERIAL); |
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209 | #endif |
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210 | |
| 83 | for (iterator i = end (); i-- != begin (); ) |
211 | for (iterator i = end (); i != begin (); ) |
| 84 | (*i)->try_draw (ctx); |
212 | (*--i)->display (ctx); |
| 85 | } |
213 | } |
| 86 | |
214 | |
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215 | void |
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216 | octant::draw_bbox (view &ctx) |
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217 | { |
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218 | sector s = orig - ctx.orig; |
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219 | int i; |
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220 | GLint verts[4 * 6] = { |
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221 | 0, 2, 3, 1, // -z |
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222 | 4, 5, 7, 6, // +z |
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223 | 0, 1, 5, 4, // -y |
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224 | 7, 3, 2, 6, // +y |
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225 | 0, 4, 6, 2, // -x |
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226 | 1, 3, 7, 5, // +x |
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227 | }; |
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228 | |
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229 | /* / |
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230 | * ------- | |
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231 | * | | | |
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232 | * | | / |
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233 | * | | / |
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234 | * ------- |
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235 | */ |
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236 | |
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237 | GLfloat cube[8][3] = |
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238 | { |
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239 | { s.x , s.y , s.z }, |
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240 | { s.x + (soffs)extent, s.y , s.z }, |
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241 | { s.x , s.y + (soffs)extent, s.z }, |
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242 | { s.x + (soffs)extent, s.y + (soffs)extent, s.z }, |
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243 | { s.x , s.y , s.z + (soffs)extent }, |
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244 | { s.x + (soffs)extent, s.y , s.z + (soffs)extent }, |
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245 | { s.x , s.y + (soffs)extent, s.z + (soffs)extent }, |
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246 | { s.x + (soffs)extent, s.y + (soffs)extent, s.z + (soffs)extent }, |
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247 | }; |
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248 | |
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249 | glBegin (GL_QUADS); |
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250 | for (i = 0; i < 4 * 6; i++) { |
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251 | glVertex3fv (cube [verts [i]]); |
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252 | } |
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253 | glEnd (); |
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254 | } |
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255 | |
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256 | |
