libgender/oct.C

#include <cstdlib>

#include <vector>

using namespace std;

#include "opengl.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 / 2)
        {
          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)
{
}

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

  if (vs.generation + 1 != ctx.generation)
    vs.visibility = visibility_state::UNKNOWN;

  vs.generation = ctx.generation;

  GLfloat extent2 = 0.5F * (GLfloat)extent;
  point center = point (orig + (extent >> 1) - ctx.orig);
  if (extent & 1) center = center + 0.5F;
  GLfloat rad = ctx.diagfact * extent2;

  if (orig <= ctx.orig && ctx.orig <= orig + extent)
    vs.visibility = visibility_state::PARTIAL;
  else
    {
      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 < -(ctx.c_far - ctx.z_far) -rad * 3.F)
        return;
    }

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

#if 0
  if (vs.visibility == visibility_state::UNKNOWN)
    vs.visibility = visibility_state::FULL;
#endif

  GLfloat z = ctx.z_near + ctx.frustum.n.distance (center) + rad;
  //printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);

  if (vs.visibility == visibility_state::FULL)
    ctx.nc_far = max (ctx.nc_far, z);

  if (size ()
      && (vs.visibility == visibility_state::PARTIAL
          || vs.visibility == visibility_state::FULL))
    {
      ctx.nz_far = max (ctx.nz_far, z);
      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 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]->detect_visibility (ctx);
    }
  while (*next);
}

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

  for (iterator i = end (); i != begin (); )
    {
      entity *e = *--i;

      sector diff = (e->a + e->b) / 2 - ctx.orig;
      GLfloat z = norm (vec3 ((e->a + e->b) / 2 - ctx.orig));
      ctx.pixfact = ctx.perspfact / z;

      e->display (ctx);
    }
}

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

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

void octant::event (occ_query &ev)
{
  visibility_state &vs = ev.v.vismap[this];

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

Revision:	1.50
Committed:	Mon Oct 11 00:05:48 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.49:	+30 -15 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	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
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	1.50	if (size >= extent2 / 2)
50	root	1.8	{
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	root	1.50	{
65			sub[i] = new octant (this, s, extent2);
66			fill++;
67			}
68	root	1.8
69			sub[i]->add (e);
70	root	1.5	}
71	root	1.8	}
72	root	1.4	}
73	root	1.2	}
74	root	1.1
75	root	1.32	void octant::remove (entity *e)
76	root	1.1	{
77			}
78
79	root	1.19	void octant::detect_visibility (view &ctx)
80	root	1.1	{
81	root	1.8	visibility_state &vs = ctx.vismap[this];
82
83	root	1.50	if (vs.generation + 1 != ctx.generation)
84			vs.visibility = visibility_state::UNKNOWN;
85
86			vs.generation = ctx.generation;
87
88	root	1.43	GLfloat extent2 = 0.5F * (GLfloat)extent;
89			point center = point (orig + (extent >> 1) - ctx.orig);
90			if (extent & 1) center = center + 0.5F;
91			GLfloat rad = ctx.diagfact * extent2;
92
93	root	1.34	if (orig <= ctx.orig && ctx.orig <= orig + extent)
94	root	1.43	vs.visibility = visibility_state::PARTIAL;
95	root	1.10	else
96			{
97	root	1.37	if (ctx.frustum.t.distance (center) < -rad) return;
98			if (ctx.frustum.b.distance (center) < -rad) return;
99			if (ctx.frustum.l.distance (center) < -rad) return;
100			if (ctx.frustum.r.distance (center) < -rad) return;
101			if (ctx.frustum.n.distance (center) < -rad) return;
102	root	1.25
103			GLfloat fd = ctx.frustum.f.distance (center);
104
105	root	1.47	if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
106			return;
107	root	1.10	}
108	root	1.8
109	root	1.46	if (vs.visibility == visibility_state::OCCLUDED
110			\|\| vs.visibility == visibility_state::UNKNOWN)
111	root	1.45	{
112			ctx.farlist.push_back (this);
113			return;
114			}
115
116	root	1.46	#if 0
117	root	1.36	if (vs.visibility == visibility_state::UNKNOWN)
118			vs.visibility = visibility_state::FULL;
119	root	1.46	#endif
120	root	1.36
121	root	1.45	GLfloat z = ctx.z_near + ctx.frustum.n.distance (center) + rad;
122	root	1.50	//printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);
123	root	1.45
124			if (vs.visibility == visibility_state::FULL)
125			ctx.nc_far = max (ctx.nc_far, z);
126
127	root	1.41	if (size ()
128			&& (vs.visibility == visibility_state::PARTIAL
129			\|\| vs.visibility == visibility_state::FULL))
130	root	1.43	{
131	root	1.45	ctx.nz_far = max (ctx.nz_far, z);
132	root	1.43	ctx.vislist.push_back (this);
133	root	1.44	}
134
135	root	1.19	// node to start with
136			unsigned char si = ctx.d.x < 0 ? 1 : 0
137			\| ctx.d.y < 0 ? 2 : 0
138			\| ctx.d.z < 0 ? 4 : 0;
139
140			// bit-toggle to find next child for front-to-back order
141	root	1.50	static unsigned char toggle[8+1]
142			= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 };
143	root	1.19
144	root	1.50	unsigned char *next = toggle;
145			do
146	root	1.19	{
147	root	1.50	si ^= *next++;
148	root	1.19
149			if (sub[si])
150			sub[si]->detect_visibility (ctx);
151			}
152	root	1.50	while (*next);
153	root	1.19	}
154
155			void octant::display (view &ctx)
156			{
157	root	1.17	#if 0
158	root	1.50	sector s = orig - ctx.orig;
159
160	root	1.8	glBegin (GL_LINES);
161	root	1.13	vec3 clr(0, 0.8, 0);
162			glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);
163	root	1.8
164			for (int i = 8; i--; )
165			for (int ji = 3; ji--; )
166			{
167			int j = i \| (1 << ji);
168	root	1.50	if (i < j)
169	root	1.8	{
170			glVertex3i (s.x + !!(i & 1) * extent,
171			s.y + !!(i & 2) * extent,
172			s.z + !!(i & 4) * extent);
173			glVertex3i (s.x + !!(j & 1) * extent,
174			s.y + !!(j & 2) * extent,
175			s.z + !!(j & 4) * extent);
176			}
177			}
178
179			glEnd ();
180			#endif
181
182	root	1.19	for (iterator i = end (); i != begin (); )
183	root	1.50	{
184			entity e = --i;
185
186			sector diff = (e->a + e->b) / 2 - ctx.orig;
187			GLfloat z = norm (vec3 ((e->a + e->b) / 2 - ctx.orig));
188			ctx.pixfact = ctx.perspfact / z;
189
190			e->display (ctx);
191			}
192	root	1.1	}
193	root	1.8
194	root	1.38	void octant::draw_bbox (view &ctx)
195	root	1.25	{
196			sector s = orig - ctx.orig;
197	root	1.27
198	root	1.50	gl::draw_bbox (ctx, s, s + extent);
199	root	1.25	}
200	root	1.8
201	root	1.38	void octant::event (occ_query &ev)
202			{
203	root	1.44	visibility_state &vs = ev.v.vismap[this];
204
205			vs.last = timer.now;
206	root	1.47	vs.visibility = ev.r <= 0
207	root	1.44	? visibility_state::OCCLUDED
208			: visibility_state::FULL;
209	root	1.38	}
210	root	1.2