libgender/oct.C

#include <cstdlib>

#include <vector>

using namespace std;

#include <GL/gl.h>

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

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;
}

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 / 2;

  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 / 2;
      uoffs size = max (abs (b - a));

      if (size > extent2 || !extent2)
        {
          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);

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

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

void octant::detect_visibility (view &ctx)
{
  visibility_state &vs = ctx.vismap[this];

  if (vs.generation != ctx.generation)
    vs.visibility = visibility_state::UNKNOWN;

  if (orig <= ctx.orig && ctx.orig <= orig + extent)
    {
      vs.visibility = visibility_state::PARTIAL;
      vs.generation = ctx.generation;
    }
  else
    {
      GLfloat extent2 = 0.5F * (GLfloat)extent;
      point center = point (orig) + extent2 - point (ctx.orig);

      GLfloat rad = ctx.diagfact * extent2;

      if (ctx.frustum.t.distance (center) < -rad) return;
      if (ctx.frustum.b.distance (center) < -rad) return;
      if (ctx.frustum.l.distance (center) < -rad) return;
      if (ctx.frustum.r.distance (center) < -rad) return;
      if (ctx.frustum.n.distance (center) < -rad) return;

      GLfloat fd = ctx.frustum.f.distance (center);

      if (fd < -rad)
        {
          if (fd < -rad * 3.F)
            return;

          if (vs.visibility == visibility_state::UNKNOWN)
            {
              ctx.farlist.push_back (this);
              return;
            }
        }
    }

  if (vs.visibility == visibility_state::UNKNOWN)
    vs.visibility = visibility_state::FULL;

  if (size ())
    ctx.vislist.push_back (this);

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

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

  for (int i = 0; i < 8; i++)
    {
      si ^= next[i];

      if (sub[si])
        sub[si]->detect_visibility (ctx);
    }

  vs.generation = ctx.generation;
}

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

  for (iterator i = end (); i != begin (); )
    (*--i)->display (ctx);
}

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

  gl::draw_box (ctx, s, s + extent);
}

void octant::event (occ_query &ev)
{
  if (ev.r <= 5)
    return;

  ev.v.vismap[this].visibility = visibility_state::FULL;
  ev.v.far = ev.v.near + ev.v.frustum.n.distance (orig);
  printf ("OCT(%x,%x,%x+%x) samples %d\n", orig.x, orig.y, orig.z, extent, ev.r);
}

Revision:	1.40
Committed:	Sat Oct 9 16:38:42 2004 UTC (19 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.39:	+6 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cstdlib>
2
3	root	1.8	#include <vector>
4
5			using namespace std;
6
7			#include <GL/gl.h>
8
9	root	1.1	#include "oct.h"
10	root	1.8	#include "view.h"
11	root	1.2	#include "entity.h"
12
13	root	1.8	octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT);
14
15			octant::octant (octant *parent, const sector &orig, uoffs extent)
16			: parent(parent), orig(orig), extent(extent)
17			{
18			for (fill = 8; fill--; )
19			sub[fill] = 0;
20	root	1.2	}
21
22			octant::~octant ()
23			{
24			for (fill = 8; fill--; )
25			delete sub[fill];
26			}
27
28	root	1.32	static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b)
29	root	1.4	{
30			ea /= 2;
31
32	root	1.34	sector center_1 = o1 + ea;
33			sector size_2 = b - a;
34			sector center_2 = a + size_2 / 2;
35	root	1.33
36	root	1.34	return abs (center_1 - center_2) <= ea + size_2;
37	root	1.4	}
38
39	root	1.32	void octant::add (entity *e)
40	root	1.2	{
41	root	1.32	const sector &a = e->a;
42			const sector &b = e->b;
43	root	1.7
44	root	1.32	if (overlap (orig, extent, a, b))
45	root	1.4	{
46	root	1.8	uoffs extent2 = extent / 2;
47	root	1.34	uoffs size = max (abs (b - a));
48	root	1.32
49	root	1.8	if (size > extent2 \|\| !extent2)
50			{
51			push_back (e);
52			e->o.push_back (this);
53			return;
54			}
55	root	1.5
56	root	1.8	for (int i = 8; i--; )
57	root	1.5	{
58	root	1.8	sector s = orig;
59			s.offset (i, extent2);
60	root	1.32
61			if (overlap (s, extent2, a, b))
62	root	1.5	{
63	root	1.8	if (!sub[i])
64			sub[i] = new octant (this, s, extent2);
65
66			sub[i]->add (e);
67	root	1.5	}
68	root	1.8	}
69	root	1.4	}
70	root	1.2	}
71	root	1.1
72	root	1.32	void octant::remove (entity *e)
73	root	1.1	{
74			}
75
76	root	1.19	void octant::detect_visibility (view &ctx)
77	root	1.1	{
78	root	1.8	visibility_state &vs = ctx.vismap[this];
79
80			if (vs.generation != ctx.generation)
81	root	1.10	vs.visibility = visibility_state::UNKNOWN;
82
83	root	1.34	if (orig <= ctx.orig && ctx.orig <= orig + extent)
84	root	1.10	{
85			vs.visibility = visibility_state::PARTIAL;
86			vs.generation = ctx.generation;
87			}
88			else
89			{
90	root	1.38	GLfloat extent2 = 0.5F * (GLfloat)extent;
91			point center = point (orig) + extent2 - point (ctx.orig);
92	root	1.10
93	root	1.38	GLfloat rad = ctx.diagfact * extent2;
94	root	1.14
95	root	1.37	if (ctx.frustum.t.distance (center) < -rad) return;
96			if (ctx.frustum.b.distance (center) < -rad) return;
97			if (ctx.frustum.l.distance (center) < -rad) return;
98			if (ctx.frustum.r.distance (center) < -rad) return;
99			if (ctx.frustum.n.distance (center) < -rad) return;
100	root	1.25
101			GLfloat fd = ctx.frustum.f.distance (center);
102
103	root	1.37	if (fd < -rad)
104	root	1.25	{
105	root	1.38	if (fd < -rad * 3.F)
106	root	1.26	return;
107
108	root	1.40	if (vs.visibility == visibility_state::UNKNOWN)
109			{
110			ctx.farlist.push_back (this);
111			return;
112			}
113	root	1.25	}
114	root	1.10	}
115	root	1.8
116	root	1.36	if (vs.visibility == visibility_state::UNKNOWN)
117			vs.visibility = visibility_state::FULL;
118
119	root	1.19	if (size ())
120			ctx.vislist.push_back (this);
121
122			// node to start with
123			unsigned char si = ctx.d.x < 0 ? 1 : 0
124			\| ctx.d.y < 0 ? 2 : 0
125			\| ctx.d.z < 0 ? 4 : 0;
126
127			// bit-toggle to find next child for front-to-back order
128			static unsigned char next[8]
129			= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7 };
130
131			for (int i = 0; i < 8; i++)
132			{
133			si ^= next[i];
134
135			if (sub[si])
136			sub[si]->detect_visibility (ctx);
137			}
138
139			vs.generation = ctx.generation;
140			}
141
142			void octant::display (view &ctx)
143			{
144	root	1.17	#if 0
145	root	1.8	glBegin (GL_LINES);
146	root	1.25	sector s = orig - ctx.orig;
147	root	1.13	vec3 clr(0, 0.8, 0);
148			glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);
149	root	1.8
150			for (int i = 8; i--; )
151			for (int ji = 3; ji--; )
152			{
153			int j = i \| (1 << ji);
154			if (i != j)
155			{
156			glVertex3i (s.x + !!(i & 1) * extent,
157			s.y + !!(i & 2) * extent,
158			s.z + !!(i & 4) * extent);
159			glVertex3i (s.x + !!(j & 1) * extent,
160			s.y + !!(j & 2) * extent,
161			s.z + !!(j & 4) * extent);
162			}
163			}
164
165			glEnd ();
166			#endif
167
168	root	1.19	for (iterator i = end (); i != begin (); )
169			(*--i)->display (ctx);
170	root	1.1	}
171	root	1.8
172	root	1.38	void octant::draw_bbox (view &ctx)
173	root	1.25	{
174			sector s = orig - ctx.orig;
175	root	1.27
176	root	1.37	gl::draw_box (ctx, s, s + extent);
177	root	1.25	}
178	root	1.8
179	root	1.38	void octant::event (occ_query &ev)
180			{
181			if (ev.r <= 5)
182			return;
183
184	root	1.40	ev.v.vismap[this].visibility = visibility_state::FULL;
185	root	1.38	ev.v.far = ev.v.near + ev.v.frustum.n.distance (orig);
186			printf ("OCT(%x,%x,%x+%x) samples %d\n", orig.x, orig.y, orig.z, extent, ev.r);
187			}
188	root	1.2