libgender/oct.C

#include <cstdlib>

#include <vector>

using namespace std;

#include "opengl.h"

#include "oct.h"
#include "view.h"
#include "entity.h"
#include "material.h" //DEBUG

struct oct_visibility : visibility_base
{
  bool subvis, evis;
  int occ_res;

  void clear ()
  {
    occ_res = -1;
    evis = true;
    subvis = true;
  }

  oct_visibility (octant &oct)
  {
    clear ();
  }
};

octant world(0, sector (0, 0, 0), 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)->clear ();
}

octant::~octant ()
{
  for (fill = 8; fill--; )
    delete sub[fill];
}

static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b)
{
  sector size   = (b - a + 1) >> 1;
  sector center = a + size;

  return abs (orig - center) <= extent + size;
}

static sector offset (const sector &s, int subindex, uoffs extent)
{
  return sector (
    s.x + (subindex & 1 ? extent : -extent),
    s.y + (subindex & 2 ? extent : -extent),
    s.z + (subindex & 4 ? extent : -extent)
  );
}

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

  uoffs size = max (abs (b - a));

  if (size >= extent >> 4)
    {
      if (overlap (orig, extent, a, b))
        {
          push_back (e);
          e->o.push_back (this);
        }
    }
  else
    {
      uoffs extent2 = extent >> 1;

      for (int i = 8; i--; )
        {
          sector s = offset (orig, 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::detect_visibility (view &ctx) //, bool fully_visible)
{
  sector centeri = orig - ctx.orig;
  point centerf = point (centeri);

  GLfloat rad = ctx.diagfact * extent;

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

  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  if (max (centeri) < extent)
    {
      vs.evis = true;
      vs.occ_res = -1;
    }
  else if (distance (ctx.frustum.t, centerf) < -rad
           || distance (ctx.frustum.b, centerf) < -rad
           || distance (ctx.frustum.l, centerf) < -rad
           || distance (ctx.frustum.r, centerf) < -rad
           || distance (ctx.frustum.n, centerf) < -rad)
    {
      vs.clear ();
      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

  // very important, optimize?
  GLfloat z = length (ctx.p - centerf) + rad;
  if (z < 0.F || ctx.perspfact * extent / z < 10.) // very crude "too small to see" check
    {
      vs.clear ();//D
      return false;
    }

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

  if (vs.occ_res > 0)
    vs.evis = true;
  else if (!(vs.subvis || vs.evis))
    {
      ctx.postdepthlist.push_back (this);
      return false;
    }
 
  bool subvis = false;

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

  // 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])
        subvis = subvis | sub[si]->detect_visibility (ctx);
    }
  while (*++next);

  vs.subvis = subvis;

  if (subvis)
    {
      if (size ())
        {
          ctx.postdepthlist.push_back (this);
          ctx.vislist.push_back (this);
        }

      return true;
    }
  else
    {
      ctx.postdepthlist.push_back (this);
      ctx.vislist.push_back (this);

      return vs.evis && vs.occ_res;
    }
}

void octant::draw_depth (view &ctx)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  if (!vs.occ_res)
    return;

  for (int i = 0; i < size (); ++i)
    {
      entity *e = (*this)[i];

      entity_visibility &evis = *(entity_visibility *)e->get_visibility (ctx);

      if (evis.occ_res)
        {
          if (!ctx.may_draw (e))
            continue;

          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 + extent);
          ctx.nz_near = min (ctx.nz_near, z - extent);

          e->draw (ctx);
        }
    }
}

void octant::draw_postdepth (view &ctx)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  if (!vs.evis)
    {
      ctx.begin_occ_query (vs.occ_res);
      sector s = orig - ctx.orig;
      gl::draw_bbox (s - extent, s + extent);
      ctx.end_occ_query ();
    }
  else
    {
      vs.evis = false;

      for (int i = 0; i < size (); ++i)
        {
          entity *e = (*this)[i];
          entity_visibility &evis = *(entity_visibility *)e->get_visibility (ctx);

          if (evis.occ_res)
            vs.evis = true;
          else
            {
              if (!ctx.may_draw (e))
                continue;

              ctx.stat1++;
              ctx.begin_occ_query (evis.occ_res);
              gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig);
              ctx.end_occ_query ();
            }
        }
    }
}

void octant::draw_lighted (view &ctx)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  if (!vs.occ_res)
    return;

#if 0
  if (vs.state == FULL || vs.state == OCCLUDED)
   {
    sector s = orig - ctx.orig;
    debugmat->enable (ctx);
  if (max (s) >= extent)
    gl::draw_bbox (s - extent, s + extent);
    debugmat->disable (ctx);
    //printf ("DLP %ld %ld %ld (%ld)\n", orig.x, orig.y, orig.z, extent);//D
   }
#endif

  for (int i = 0; i < size (); ++i)
    {
      entity *e = (*this)[i];
      entity_visibility &evis = *(entity_visibility *)e->get_visibility (ctx);

      if (evis.occ_res)
        {
          if (!ctx.may_draw (e))
            continue;

          sector center = ((e->a + e->b) >> 1) - ctx.orig;
          GLfloat z = length (vec3 (center));
          ctx.pixfact = ctx.perspfact / z;

          if (!ctx.first_lighted
              || evis.next > timer.now)
            e->draw (ctx);
          else
            {
              evis.next = timer.now + 0.2;
              ctx.begin_occ_query (evis.occ_res);
              e->draw (ctx);
              ctx.end_occ_query ();
            }
        }
    }
}

Revision:	1.96
Committed:	Thu Aug 11 23:26:24 2005 UTC (18 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.95:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cstdlib>
2
3	root	1.8	#include <vector>
4	root	1.91
5	root	1.8	using namespace std;
6
7	root	1.48	#include "opengl.h"
8	root	1.8
9	root	1.1	#include "oct.h"
10	root	1.8	#include "view.h"
11	root	1.2	#include "entity.h"
12	root	1.89	#include "material.h" //DEBUG
13	root	1.2
14	root	1.52	struct oct_visibility : visibility_base
15			{
16	root	1.93	bool subvis, evis;
17			int occ_res;
18	root	1.52
19	root	1.93	void clear ()
20	root	1.79	{
21	root	1.93	occ_res = -1;
22			evis = true;
23			subvis = true;
24	root	1.79	}
25
26	root	1.52	oct_visibility (octant &oct)
27			{
28	root	1.93	clear ();
29	root	1.52	}
30			};
31
32	root	1.75	octant world(0, sector (0, 0, 0), MAXEXTENT);
33	root	1.8
34			octant::octant (octant *parent, const sector &orig, uoffs extent)
35	root	1.54	: parent(parent)
36			, orig(orig)
37			, extent(extent)
38	root	1.8	{
39			for (fill = 8; fill--; )
40			sub[fill] = 0;
41	root	1.2	}
42
43	root	1.53	visibility_base *octant::new_visibility ()
44			{
45			return new oct_visibility (*this);
46			}
47
48			void octant::clear_visibility (visibility_base *vs)
49			{
50	root	1.93	((oct_visibility *)vs)->clear ();
51	root	1.53	}
52	root	1.65
53	root	1.2	octant::~octant ()
54			{
55			for (fill = 8; fill--; )
56			delete sub[fill];
57			}
58
59	root	1.75	static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b)
60	root	1.4	{
61	root	1.75	sector size = (b - a + 1) >> 1;
62			sector center = a + size;
63	root	1.4
64	root	1.75	return abs (orig - center) <= extent + size;
65			}
66	root	1.33
67	root	1.75	static sector offset (const sector &s, int subindex, uoffs extent)
68			{
69			return sector (
70			s.x + (subindex & 1 ? extent : -extent),
71			s.y + (subindex & 2 ? extent : -extent),
72			s.z + (subindex & 4 ? extent : -extent)
73			);
74	root	1.4	}
75
76	root	1.32	void octant::add (entity *e)
77	root	1.2	{
78	root	1.32	const sector &a = e->a;
79			const sector &b = e->b;
80	root	1.7
81	root	1.80	uoffs size = max (abs (b - a));
82
83			if (size >= extent >> 4)
84	root	1.4	{
85	root	1.80	if (overlap (orig, extent, a, b))
86	root	1.8	{
87			push_back (e);
88			e->o.push_back (this);
89			}
90	root	1.80	}
91			else
92			{
93			uoffs extent2 = extent >> 1;
94	root	1.5
95	root	1.8	for (int i = 8; i--; )
96	root	1.5	{
97	root	1.75	sector s = offset (orig, i, extent2);
98	root	1.32
99			if (overlap (s, extent2, a, b))
100	root	1.5	{
101	root	1.8	if (!sub[i])
102	root	1.50	{
103			sub[i] = new octant (this, s, extent2);
104			fill++;
105			}
106	root	1.8
107			sub[i]->add (e);
108	root	1.5	}
109	root	1.8	}
110	root	1.4	}
111	root	1.2	}
112	root	1.1
113	root	1.32	void octant::remove (entity *e)
114	root	1.1	{
115			}
116
117	root	1.80	bool octant::detect_visibility (view &ctx) //, bool fully_visible)
118	root	1.1	{
119	root	1.75	sector centeri = orig - ctx.orig;
120			point centerf = point (centeri);
121	root	1.51
122	root	1.75	GLfloat rad = ctx.diagfact * extent;
123	root	1.43
124	root	1.59	if (!overlap (ctx.frustum.c, sphere (centerf, rad)))
125			return false;
126	root	1.65
127			oct_visibility &vs = (oct_visibility )get_visibility (ctx);
128	root	1.59
129	root	1.90	if (max (centeri) < extent)
130	root	1.10	{
131	root	1.93	vs.evis = true;
132			vs.occ_res = -1;
133			}
134			else if (distance (ctx.frustum.t, centerf) < -rad
135			\|\| distance (ctx.frustum.b, centerf) < -rad
136			\|\| distance (ctx.frustum.l, centerf) < -rad
137			\|\| distance (ctx.frustum.r, centerf) < -rad
138			\|\| distance (ctx.frustum.n, centerf) < -rad)
139			{
140			vs.clear ();
141			return false;
142	root	1.90	}
143	root	1.25
144	root	1.59	#if 0
145	root	1.91	GLfloat fd = distance (ctx.frustum.f, centerf);
146	root	1.25
147	root	1.91	if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
148			return false;
149	root	1.80	#endif
150	root	1.8
151	root	1.75	// very important, optimize?
152	root	1.85	GLfloat z = length (ctx.p - centerf) + rad;
153	root	1.86	if (z < 0.F \|\| ctx.perspfact * extent / z < 10.) // very crude "too small to see" check
154	root	1.93	{
155			vs.clear ();//D
156			return false;
157			}
158	root	1.45
159	root	1.59	#if 0
160	root	1.56	if (vs.state == PARTIAL \|\| vs.state == FULL)
161	root	1.45	ctx.nc_far = max (ctx.nc_far, z);
162	root	1.59	#endif
163	root	1.45
164	root	1.93	if (vs.occ_res > 0)
165	root	1.95	vs.evis = true;
166	root	1.94	else if (!(vs.subvis \|\| vs.evis))
167	root	1.93	{
168	root	1.94	ctx.postdepthlist.push_back (this);
169			return false;
170	root	1.93	}
171	root	1.72
172	root	1.93	bool subvis = false;
173	root	1.74
174	root	1.51	// node to start with
175			unsigned char si = centeri.x > 0 ? 1 : 0
176			\| centeri.y > 0 ? 2 : 0
177			\| centeri.z > 0 ? 4 : 0;
178	root	1.19
179			// bit-toggle to find next child for front-to-back order
180	root	1.50	static unsigned char toggle[8+1]
181	root	1.51	= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 };
182	root	1.19
183	root	1.50	unsigned char *next = toggle;
184			do
185	root	1.19	{
186	root	1.51	si ^= *next;
187	root	1.19
188			if (sub[si])
189	root	1.93	subvis = subvis \| sub[si]->detect_visibility (ctx);
190	root	1.19	}
191	root	1.51	while (*++next);
192
193	root	1.93	vs.subvis = subvis;
194
195			if (subvis)
196	root	1.71	{
197			if (size ())
198	root	1.91	{
199			ctx.postdepthlist.push_back (this);
200	root	1.93	ctx.vislist.push_back (this);
201	root	1.91	}
202
203			return true;
204			}
205	root	1.93	else
206	root	1.81	{
207	root	1.93	ctx.postdepthlist.push_back (this);
208			ctx.vislist.push_back (this);
209	root	1.91
210	root	1.96	return vs.evis && vs.occ_res;
211	root	1.91	}
212	root	1.19	}
213
214	root	1.75	void octant::draw_depth (view &ctx)
215	root	1.19	{
216	root	1.54	oct_visibility &vs = (oct_visibility )get_visibility (ctx);
217	root	1.8
218	root	1.95	if (!vs.occ_res)
219	root	1.75	return;
220
221	root	1.79	for (int i = 0; i < size (); ++i)
222	root	1.50	{
223	root	1.79	entity e = (this)[i];
224	root	1.75
225	root	1.93	entity_visibility &evis = (entity_visibility )e->get_visibility (ctx);
226
227			if (evis.occ_res)
228	root	1.54	{
229	root	1.75	if (!ctx.may_draw (e))
230			continue;
231
232			sector center = ((e->a + e->b) >> 1) - ctx.orig;
233			GLfloat z = length (vec3 (center));
234			ctx.pixfact = ctx.perspfact / z;
235
236			ctx.nz_far = max (ctx.nz_far, z + extent);
237			ctx.nz_near = min (ctx.nz_near, z - extent);
238
239			e->draw (ctx);
240	root	1.56	}
241			}
242	root	1.75	}
243
244			void octant::draw_postdepth (view &ctx)
245			{
246			oct_visibility &vs = (oct_visibility )get_visibility (ctx);
247
248	root	1.94	if (!vs.evis)
249	root	1.75	{
250	root	1.93	ctx.begin_occ_query (vs.occ_res);
251	root	1.75	sector s = orig - ctx.orig;
252			gl::draw_bbox (s - extent, s + extent);
253			ctx.end_occ_query ();
254			}
255	root	1.56	else
256			{
257	root	1.93	vs.evis = false;
258	root	1.64
259	root	1.79	for (int i = 0; i < size (); ++i)
260	root	1.56	{
261	root	1.79	entity e = (this)[i];
262	root	1.93	entity_visibility &evis = (entity_visibility )e->get_visibility (ctx);
263	root	1.56
264	root	1.93	if (evis.occ_res)
265			vs.evis = true;
266			else
267	root	1.56	{
268	root	1.75	if (!ctx.may_draw (e))
269			continue;
270
271	root	1.93	ctx.stat1++;
272			ctx.begin_occ_query (evis.occ_res);
273	root	1.75	gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig);
274			ctx.end_occ_query ();
275	root	1.56	}
276	root	1.75	}
277			}
278			}
279
280			void octant::draw_lighted (view &ctx)
281			{
282			oct_visibility &vs = (oct_visibility )get_visibility (ctx);
283
284	root	1.95	if (!vs.occ_res)
285			return;
286
287	root	1.90	#if 0
288			if (vs.state == FULL \|\| vs.state == OCCLUDED)
289	root	1.87	{
290	root	1.90	sector s = orig - ctx.orig;
291			debugmat->enable (ctx);
292			if (max (s) >= extent)
293			gl::draw_bbox (s - extent, s + extent);
294			debugmat->disable (ctx);
295			//printf ("DLP %ld %ld %ld (%ld)\n", orig.x, orig.y, orig.z, extent);//D
296	root	1.87	}
297			#endif
298
299	root	1.79	for (int i = 0; i < size (); ++i)
300	root	1.75	{
301	root	1.79	entity e = (this)[i];
302	root	1.93	entity_visibility &evis = (entity_visibility )e->get_visibility (ctx);
303	root	1.75
304	root	1.93	if (evis.occ_res)
305	root	1.75	{
306	root	1.66	if (!ctx.may_draw (e))
307			continue;
308
309	root	1.75	sector center = ((e->a + e->b) >> 1) - ctx.orig;
310			GLfloat z = length (vec3 (center));
311			ctx.pixfact = ctx.perspfact / z;
312
313	root	1.91	if (!ctx.first_lighted
314	root	1.93	\|\| evis.next > timer.now)
315	root	1.75	e->draw (ctx);
316			else
317			{
318	root	1.94	evis.next = timer.now + 0.2;
319	root	1.93	ctx.begin_occ_query (evis.occ_res);
320	root	1.75	e->draw (ctx);
321			ctx.end_occ_query ();
322	root	1.56	}
323	root	1.54	}
324	root	1.50	}
325	root	1.1	}
326	root	1.8