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Comparing libgender/oct.C (file contents):
Revision 1.23 by root, Wed Oct 6 02:10:44 2004 UTC vs.
Revision 1.71 by root, Sun Nov 7 02:28:18 2004 UTC

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

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