libgender/oct.C

#include <cstdlib>

#include <vector>
using namespace std;

#include "opengl.h"

#include "oct.h"
#include "view.h"
#include "entity.h"

enum visibility_state { FULL, PARTIAL, SMALL, OCCLUDED };

struct evis {
  visibility_state state;
  double last; // time of last check
  evis () : last(0.), state(FULL) { };
};

struct oct_visibility : visibility_base
{
  typedef map<entity *, evis> evismap;
  evismap vismap;

  visibility_state state;

  oct_visibility (octant &oct)
  : state(FULL)
  {
  }
};

octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT);

octant::octant (octant *parent, const sector &orig, uoffs extent)
: parent(parent)
, orig(orig)
, extent(extent)
{
  for (fill = 8; fill--; )
    sub[fill] = 0;
}

visibility_base *octant::new_visibility ()
{
  return new oct_visibility (*this);
}

void octant::clear_visibility (visibility_base *vs)
{
  ((oct_visibility *)vs)->vismap.clear ();
}
octant::~octant ()
{
  for (fill = 8; fill--; )
    delete sub[fill];
}

static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b)
{
  ea /= 2;

  sector center_1 = o1 + ea;
  sector size_2   = b - a;
  sector center_2 = a + (size_2 >> 1);

  return abs (center_1 - center_2) <= ea + size_2;
}

void octant::add (entity *e)
{
  const sector &a = e->a;
  const sector &b = e->b;

  if (overlap (orig, extent, a, b))
    {
      uoffs extent2 = extent >> 1;
      uoffs size = max (abs (b - a));

      if (size >= extent2 >> 1)
        {
          push_back (e);
          e->o.push_back (this);
          return;
        }

      for (int i = 8; i--; )
        {
          sector s = orig;
          s.offset (i, extent2);

          if (overlap (s, extent2, a, b))
            {
              if (!sub[i])
                {
                  sub[i] = new octant (this, s, extent2);
                  fill++;
                }

              sub[i]->add (e);
            }
        }
    }
}

void octant::remove (entity *e)
{
}

bool octant::depth_pass (view &ctx)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  GLfloat extent2 = 0.5F * (GLfloat)extent;
  sector centeri = orig + (extent >> 1) - ctx.orig;
  point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F);

  GLfloat rad = ctx.diagfact * extent2;

  if (!overlap (ctx.frustum.c, sphere (centerf, rad)))
    return false;

  if (orig <= ctx.orig && ctx.orig <= orig + extent)
    vs.state = PARTIAL;
  else
    {
      if (distance (ctx.frustum.t, centerf) < -rad) return false;
      if (distance (ctx.frustum.b, centerf) < -rad) return false;
      if (distance (ctx.frustum.l, centerf) < -rad) return false;
      if (distance (ctx.frustum.r, centerf) < -rad) return false;
      if (distance (ctx.frustum.n, centerf) < -rad) return false;

#if 0
      GLfloat fd = distance (ctx.frustum.f, centerf);

      if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
        return false;
#endif
    }

  if (vs.state == OCCLUDED)
    return false;

  GLfloat z = ctx.z_near + distance (ctx.frustum.n, centerf) + rad;
  if (ctx.perspfact * extent / z < 1.) // very crude "too small to see" check
    return false;
  //printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);

#if 0
  if (vs.state == PARTIAL || vs.state == FULL)
    ctx.nc_far = max (ctx.nc_far, z);
#endif

  // node to start with
  unsigned char si = centeri.x > 0 ? 1 : 0
                   | centeri.y > 0 ? 2 : 0
                   | centeri.z > 0 ? 4 : 0;

  //printf ("si %d C %Ld,%Ld,%Ld\n", si, centeri.x, centeri.y, centeri.z);

  // bit-toggle to find next child for front-to-back order
  static unsigned char toggle[8+1]
    = { 0,  0^1, 1^2, 2^4, 4^3, 3^5, 5^6,  6^7, 0 };

  unsigned char *next = toggle;
  do
    {
      si ^= *next;

      if (sub[si])
        sub[si]->depth_pass (ctx);
    }
  while (*++next);

  if (size ()
      && (vs.state == PARTIAL || vs.state == FULL))
    {
      display (ctx);
      ctx.vislist.push_back (this);
    }

  return true;
}

void octant::display (view &ctx)
{
#if 0
  sector s = orig - ctx.orig;

  glBegin (GL_LINES);
  vec3 clr(0, 0.8, 0);
  glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);

  for (int i = 8; i--; )
    for (int ji = 3; ji--; )
      {
        int j = i | (1 << ji);
        if (i < j)
          {
            glVertex3i (s.x + !!(i & 1) * extent,
                        s.y + !!(i & 2) * extent,
                        s.z + !!(i & 4) * extent);
            glVertex3i (s.x + !!(j & 1) * extent,
                        s.y + !!(j & 2) * extent,
                        s.z + !!(j & 4) * extent);
          }
      }
  
  glEnd ();
#endif
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  if (vs.state == OCCLUDED)
    {
      abort ();
      if (ctx.pass == view::POSTDEPTH)
        {
          ctx.begin_occ_query (*this, 0);
          sector s = orig - ctx.orig;
          gl::draw_bbox (vb_bbox, s, s + extent);
          ctx.end_occ_query ();
        }
    }
  else
    {
      for (iterator i = begin (); i != end (); )
        {
          entity *e = *i++;

          if (!ctx.may_draw (e))
            continue;

          evis &evs = vs.vismap[e];

          if (ctx.pass == view::POSTDEPTH)
            {
              if (evs.state == OCCLUDED)
                {
                  ctx.begin_occ_query (*this, e);
                  gl::draw_bbox (vb_bbox, e->a - ctx.orig, e->b - ctx.orig);
                  ctx.end_occ_query ();
                }
            }
          else
            {
              if (evs.state != OCCLUDED)
                {
                  sector center = ((e->a + e->b) >> 1) - ctx.orig;
                  GLfloat z = length (vec3 (center));
                  ctx.pixfact = ctx.perspfact / z;

                  ctx.nz_far = max (ctx.nz_far, z);

                  if (ctx.pass == view::DEPTH || evs.last + 1. > timer.now)
                    e->draw (ctx);
                  else
                    {
                      evs.last = timer.now;
                      ctx.begin_occ_query (*this, e);
                      e->draw (ctx);
                      ctx.end_occ_query ();
                    }
                }
            }
        }
    }
}

#if 0
void octant::draw_bbox (view &ctx)
{
  sector s = orig - ctx.orig;

  gl::draw_bbox (ctx, s, s + extent);
}
#endif

void octant::event (occ_query &ev)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx);
  entity *e = (entity *)ev.id;

  if (e)
    {
      evis &evs = vs.vismap[e];
      evs.state = ev.count ? FULL : OCCLUDED;
    }
  else
    {
      //vs.state = ev.count ? FULL : OCCLUDED;
    }

#if 0
  visibility_state &vs = ev.v.vismap[this];

  vs.last = timer.now;
  vs.state = ev.r <= 0
                  ? visibility_state::OCCLUDED
                  : visibility_state::FULL;
#endif
}


Revision:	1.59
Committed:	Mon Oct 18 12:01:14 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.58:	+16 -10 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cstdlib>
2
3	root	1.8	#include <vector>
4			using namespace std;
5
6	root	1.48	#include "opengl.h"
7	root	1.8
8	root	1.1	#include "oct.h"
9	root	1.8	#include "view.h"
10	root	1.2	#include "entity.h"
11
12	root	1.56	enum visibility_state { FULL, PARTIAL, SMALL, OCCLUDED };
13
14	root	1.54	struct evis {
15	root	1.56	visibility_state state;
16	root	1.54	double last; // time of last check
17			evis () : last(0.), state(FULL) { };
18			};
19
20	root	1.52	struct oct_visibility : visibility_base
21			{
22	root	1.54	typedef map<entity *, evis> evismap;
23			evismap vismap;
24	root	1.52
25	root	1.56	visibility_state state;
26	root	1.52
27			oct_visibility (octant &oct)
28	root	1.54	: state(FULL)
29	root	1.52	{
30			}
31			};
32
33	root	1.8	octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT);
34
35			octant::octant (octant *parent, const sector &orig, uoffs extent)
36	root	1.54	: parent(parent)
37			, orig(orig)
38			, extent(extent)
39	root	1.8	{
40			for (fill = 8; fill--; )
41			sub[fill] = 0;
42	root	1.2	}
43
44	root	1.53	visibility_base *octant::new_visibility ()
45			{
46			return new oct_visibility (*this);
47			}
48
49			void octant::clear_visibility (visibility_base *vs)
50			{
51			((oct_visibility *)vs)->vismap.clear ();
52			}
53	root	1.2	octant::~octant ()
54			{
55			for (fill = 8; fill--; )
56			delete sub[fill];
57			}
58
59	root	1.32	static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b)
60	root	1.4	{
61			ea /= 2;
62
63	root	1.34	sector center_1 = o1 + ea;
64			sector size_2 = b - a;
65	root	1.54	sector center_2 = a + (size_2 >> 1);
66	root	1.33
67	root	1.34	return abs (center_1 - center_2) <= ea + size_2;
68	root	1.4	}
69
70	root	1.32	void octant::add (entity *e)
71	root	1.2	{
72	root	1.32	const sector &a = e->a;
73			const sector &b = e->b;
74	root	1.7
75	root	1.32	if (overlap (orig, extent, a, b))
76	root	1.4	{
77	root	1.54	uoffs extent2 = extent >> 1;
78	root	1.34	uoffs size = max (abs (b - a));
79	root	1.32
80	root	1.54	if (size >= extent2 >> 1)
81	root	1.8	{
82			push_back (e);
83			e->o.push_back (this);
84			return;
85			}
86	root	1.5
87	root	1.8	for (int i = 8; i--; )
88	root	1.5	{
89	root	1.8	sector s = orig;
90			s.offset (i, extent2);
91	root	1.32
92			if (overlap (s, extent2, a, b))
93	root	1.5	{
94	root	1.8	if (!sub[i])
95	root	1.50	{
96			sub[i] = new octant (this, s, extent2);
97			fill++;
98			}
99	root	1.8
100			sub[i]->add (e);
101	root	1.5	}
102	root	1.8	}
103	root	1.4	}
104	root	1.2	}
105	root	1.1
106	root	1.32	void octant::remove (entity *e)
107	root	1.1	{
108			}
109
110	root	1.55	bool octant::depth_pass (view &ctx)
111	root	1.1	{
112	root	1.52	oct_visibility &vs = (oct_visibility )get_visibility (ctx);
113	root	1.50
114	root	1.43	GLfloat extent2 = 0.5F * (GLfloat)extent;
115	root	1.51	sector centeri = orig + (extent >> 1) - ctx.orig;
116			point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F);
117
118	root	1.43	GLfloat rad = ctx.diagfact * extent2;
119
120	root	1.59	if (!overlap (ctx.frustum.c, sphere (centerf, rad)))
121			return false;
122
123	root	1.34	if (orig <= ctx.orig && ctx.orig <= orig + extent)
124	root	1.56	vs.state = PARTIAL;
125	root	1.10	else
126			{
127	root	1.59	if (distance (ctx.frustum.t, centerf) < -rad) return false;
128			if (distance (ctx.frustum.b, centerf) < -rad) return false;
129			if (distance (ctx.frustum.l, centerf) < -rad) return false;
130			if (distance (ctx.frustum.r, centerf) < -rad) return false;
131			if (distance (ctx.frustum.n, centerf) < -rad) return false;
132	root	1.25
133	root	1.59	#if 0
134			GLfloat fd = distance (ctx.frustum.f, centerf);
135	root	1.25
136	root	1.47	if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
137	root	1.52	return false;
138	root	1.58	#endif
139	root	1.10	}
140	root	1.8
141	root	1.56	if (vs.state == OCCLUDED)
142			return false;
143	root	1.36
144	root	1.59	GLfloat z = ctx.z_near + distance (ctx.frustum.n, centerf) + rad;
145	root	1.58	if (ctx.perspfact * extent / z < 1.) // very crude "too small to see" check
146			return false;
147	root	1.50	//printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);
148	root	1.45
149	root	1.59	#if 0
150	root	1.56	if (vs.state == PARTIAL \|\| vs.state == FULL)
151	root	1.45	ctx.nc_far = max (ctx.nc_far, z);
152	root	1.59	#endif
153	root	1.45
154	root	1.51	// node to start with
155			unsigned char si = centeri.x > 0 ? 1 : 0
156			\| centeri.y > 0 ? 2 : 0
157			\| centeri.z > 0 ? 4 : 0;
158	root	1.44
159	root	1.51	//printf ("si %d C %Ld,%Ld,%Ld\n", si, centeri.x, centeri.y, centeri.z);
160	root	1.19
161			// bit-toggle to find next child for front-to-back order
162	root	1.50	static unsigned char toggle[8+1]
163	root	1.51	= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 };
164	root	1.19
165	root	1.50	unsigned char *next = toggle;
166			do
167	root	1.19	{
168	root	1.51	si ^= *next;
169	root	1.19
170			if (sub[si])
171	root	1.55	sub[si]->depth_pass (ctx);
172	root	1.19	}
173	root	1.51	while (*++next);
174
175			if (size ()
176	root	1.56	&& (vs.state == PARTIAL \|\| vs.state == FULL))
177	root	1.51	{
178	root	1.55	display (ctx);
179	root	1.51	ctx.vislist.push_back (this);
180			}
181	root	1.52
182			return true;
183	root	1.19	}
184
185			void octant::display (view &ctx)
186			{
187	root	1.17	#if 0
188	root	1.50	sector s = orig - ctx.orig;
189
190	root	1.8	glBegin (GL_LINES);
191	root	1.13	vec3 clr(0, 0.8, 0);
192			glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);
193	root	1.8
194			for (int i = 8; i--; )
195			for (int ji = 3; ji--; )
196			{
197			int j = i \| (1 << ji);
198	root	1.50	if (i < j)
199	root	1.8	{
200			glVertex3i (s.x + !!(i & 1) * extent,
201			s.y + !!(i & 2) * extent,
202			s.z + !!(i & 4) * extent);
203			glVertex3i (s.x + !!(j & 1) * extent,
204			s.y + !!(j & 2) * extent,
205			s.z + !!(j & 4) * extent);
206			}
207			}
208
209			glEnd ();
210			#endif
211	root	1.54	oct_visibility &vs = (oct_visibility )get_visibility (ctx);
212	root	1.8
213	root	1.56	if (vs.state == OCCLUDED)
214	root	1.50	{
215	root	1.56	abort ();
216			if (ctx.pass == view::POSTDEPTH)
217	root	1.54	{
218	root	1.56	ctx.begin_occ_query (*this, 0);
219	root	1.57	sector s = orig - ctx.orig;
220			gl::draw_bbox (vb_bbox, s, s + extent);
221	root	1.56	ctx.end_occ_query ();
222			}
223			}
224			else
225			{
226	root	1.57	for (iterator i = begin (); i != end (); )
227	root	1.56	{
228	root	1.57	entity e = i++;
229	root	1.56
230			if (!ctx.may_draw (e))
231			continue;
232
233			evis &evs = vs.vismap[e];
234
235			if (ctx.pass == view::POSTDEPTH)
236			{
237			if (evs.state == OCCLUDED)
238			{
239			ctx.begin_occ_query (*this, e);
240	root	1.57	gl::draw_bbox (vb_bbox, e->a - ctx.orig, e->b - ctx.orig);
241	root	1.56	ctx.end_occ_query ();
242			}
243			}
244			else
245			{
246			if (evs.state != OCCLUDED)
247			{
248			sector center = ((e->a + e->b) >> 1) - ctx.orig;
249	root	1.59	GLfloat z = length (vec3 (center));
250	root	1.56	ctx.pixfact = ctx.perspfact / z;
251	root	1.59
252			ctx.nz_far = max (ctx.nz_far, z);
253	root	1.56
254			if (ctx.pass == view::DEPTH \|\| evs.last + 1. > timer.now)
255			e->draw (ctx);
256			else
257			{
258			evs.last = timer.now;
259			ctx.begin_occ_query (*this, e);
260			e->draw (ctx);
261			ctx.end_occ_query ();
262			}
263			}
264			}
265	root	1.54	}
266	root	1.50	}
267	root	1.1	}
268	root	1.8
269	root	1.53	#if 0
270	root	1.38	void octant::draw_bbox (view &ctx)
271	root	1.25	{
272			sector s = orig - ctx.orig;
273	root	1.27
274	root	1.50	gl::draw_bbox (ctx, s, s + extent);
275	root	1.25	}
276	root	1.53	#endif
277	root	1.8
278	root	1.38	void octant::event (occ_query &ev)
279			{
280	root	1.56	oct_visibility &vs = (oct_visibility )get_visibility (ev.ctx);
281			entity e = (entity )ev.id;
282
283			if (e)
284			{
285			evis &evs = vs.vismap[e];
286			evs.state = ev.count ? FULL : OCCLUDED;
287			}
288			else
289			{
290	root	1.57	//vs.state = ev.count ? FULL : OCCLUDED;
291	root	1.56	}
292
293	root	1.52	#if 0
294	root	1.44	visibility_state &vs = ev.v.vismap[this];
295
296			vs.last = timer.now;
297	root	1.56	vs.state = ev.r <= 0
298	root	1.44	? visibility_state::OCCLUDED
299			: visibility_state::FULL;
300	root	1.52	#endif
301			}
302
303	root	1.2