libgender/view.C

#include <cmath>

#include "opengl.h"

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

vector<GLuint> occ_query_objects;

static GLuint begin_occ_query ()
{
  GLuint id;

  if (occ_query_objects.size ())
    {
      id = *(occ_query_objects.end () - 1);
      occ_query_objects.pop_back ();
    }
  else
    glGenQueriesARB (1, &id);

  glBeginQueryARB (GL_SAMPLES_PASSED, id);
  return id;
}

inline void end_occ_query ()
{
  glEndQueryARB (GL_SAMPLES_PASSED);
}

static GLuint occ_query_result (GLuint id)
{
  GLuint count;

  glGetQueryObjectuivARB (id, GL_QUERY_RESULT, &count);
  occ_query_objects.push_back (id);

  return count;
}

view::view ()
: gamma(1.0)
{
}

view::~view ()
{
}

void view::begin_occ_query (recv_occ_query &recv, void *id)
{
  occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
}

void view::end_occ_query ()
{
  ::end_occ_query ();
}

bool view::may_draw (const entity *e)
{
  if (drawn.find (e) != drawn.end ())
    return false;

  drawn.insert (e);
  return true;
}

visibility_base *visible::get_visibility (view &ctx)
{
  view::visibility_map::iterator i = ctx.vismap.find (this);
  visibility_base *vs;

  if (i == ctx.vismap.end ())
    {
      vs = new_visibility ();
      ctx.vismap.insert (view::visibility_map::value_type (this, vs));
    }
  else
    {
      vs = i->second;

      if (vs->generation != ctx.generation)
        {
          if (vs->generation + 1 != ctx.generation)
            clear_visibility (vs);

          vs->generation = ctx.generation;
        }
    }

  return vs;

}

void view::reset_projection ()
{
  renormalize (orig, p);

  glViewport (0, 0, w, h);

  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();

  GLdouble aspect = (GLdouble)w/h;
  GLdouble ymax = z_near * tan (fov * (M_PI / 360.0));

  glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, z_near, z_far);

  perspfact = z_near / ymax * 0.5 * (GLdouble)h;

  d = normalize (d);//D
  u = normalize (u);//D

  vec3 rz = -d;
  vec3 rx = cross (u, rz);
  vec3 ry = cross (rz, rx);

  matrix &m = projection;
  m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
  m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
  m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
  m(3,0) =    0; m(3,1) =    0; m(3,2) =    0; m(3,3) = 1;

  diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
  //printf ("diagfact = %f\n", diagfact);
  diagfact = sqrtf (3.);//D WHY???

  glMultMatrixf (m);
  glTranslatef (-p.x, -p.y, -p.z);

  glGetFloatv (GL_PROJECTION_MATRIX, m);

  frustum.l = plane ( m(3,0) + m(0,0), m(3,1) + m(0,1), m(3,2) + m(0,2), m(3,3) + m(0,3) );
  frustum.r = plane ( m(3,0) - m(0,0), m(3,1) - m(0,1), m(3,2) - m(0,2), m(3,3) - m(0,3) );
  frustum.b = plane ( m(3,0) + m(1,0), m(3,1) + m(1,1), m(3,2) + m(1,2), m(3,3) + m(1,3) );
  frustum.t = plane ( m(3,0) - m(1,0), m(3,1) - m(1,1), m(3,2) - m(1,2), m(3,3) - m(1,3) );
  frustum.n = plane ( m(3,0) + m(2,0), m(3,1) + m(2,1), m(3,2) + m(2,2), m(3,3) + m(2,3) );
  frustum.f = plane ( m(3,0) - m(2,0), m(3,1) - m(2,1), m(3,2) - m(2,2), m(3,3) - m(2,3) );

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();
}

void view::begin ()
{
  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  vislist.clear ();

  generation++;

  farlist.clear ();

  // check occlusion queries
  for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
    {
      occ_query oq(*this, i->data, ::occ_query_result (i->id));
      i->recv->event (oq);
    }

  occ_queries.clear ();

  z_far = nz_far;
  c_far = nc_far;

  if (z_far < z_near)
    z_far = z_near * 2.;

  reset_projection ();

  nc_far = nz_far = z_near + 1.F;
  world.detect_visibility (*this);

  printf ("far %f cf %f CAM (%d,%d,%d)\n", z_far, c_far, orig.x, orig.y, orig.z);//D
}

void view::end ()
{
  vislist.clear ();
}

#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))

void view::pass (enum mode m)
{
  mode = m;

  glDisable (GL_ALPHA_TEST);
  glDisable (GL_BLEND);

  switch (mode)
    {
      case DEPTH:
        //glEnable (GL_POLYGON_OFFSET_FILL);
        //glPolygonOffset (0, 5);
        glDisable (GL_MINMAX);
        glDepthRange (DEPTH_OFFSET, 1.);
        glDepthFunc (GL_LESS);
        glEnable (GL_DEPTH_TEST);
        glDisable (GL_LIGHTING);
        glColorMask (0, 0, 0, 0);
        glDepthMask (1);
        break;

      case POSTDEPTH:
        glEnable (GL_DEPTH_TEST);
        glColorMask (0, 0, 0, 0);
        glDepthMask (0);
        break;

      case LIGHTED:
        glEnable (GL_MINMAX);
        //glDisable (GL_POLYGON_OFFSET_FILL);
        glDepthRange (0., 1. - DEPTH_OFFSET);
        glDepthFunc (GL_LESS);
        glColorMask (1, 1, 1, 0);
        glDepthMask (0);
        break;
    }
  
  for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
    (*i)->display (*this);

  drawn.clear ();

#if 0
  if (mode == view::DEPTH)
    {
      glEnable (GL_DEPTH_CLAMP_NV);
      glDepthMask (0);
      glDepthFunc (GL_LESS);

      for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
        {
          begin_occ_query (**i);
          (*i)->draw_bbox (*this);
          end_occ_query ();
       }

      glDisable (GL_DEPTH_CLAMP_NV);
    }
#endif
}


Revision:	1.52
Committed:	Sat Oct 16 14:48:48 2004 UTC (21 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.51:	+30 -46 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cmath>
2
3	root	1.45	#include "opengl.h"
4	root	1.26
5	root	1.37	#include "view.h"
6	root	1.1	#include "oct.h"
7
8	root	1.37	vector<GLuint> occ_query_objects;
9
10			static GLuint begin_occ_query ()
11			{
12			GLuint id;
13
14			if (occ_query_objects.size ())
15			{
16			id = *(occ_query_objects.end () - 1);
17			occ_query_objects.pop_back ();
18			}
19			else
20			glGenQueriesARB (1, &id);
21
22			glBeginQueryARB (GL_SAMPLES_PASSED, id);
23			return id;
24			}
25
26			inline void end_occ_query ()
27			{
28			glEndQueryARB (GL_SAMPLES_PASSED);
29			}
30
31			static GLuint occ_query_result (GLuint id)
32			{
33			GLuint count;
34
35			glGetQueryObjectuivARB (id, GL_QUERY_RESULT, &count);
36			occ_query_objects.push_back (id);
37
38			return count;
39			}
40
41	root	1.17	view::view ()
42	root	1.18	: gamma(1.0)
43	root	1.1	{
44			}
45
46	root	1.17	view::~view ()
47	root	1.1	{
48			}
49
50	root	1.51	void view::begin_occ_query (recv_occ_query &recv, void *id)
51	root	1.37	{
52	root	1.51	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
53	root	1.37	}
54
55			void view::end_occ_query ()
56			{
57			::end_occ_query ();
58			}
59
60	root	1.34	bool view::may_draw (const entity *e)
61	root	1.1	{
62			if (drawn.find (e) != drawn.end ())
63			return false;
64
65			drawn.insert (e);
66			return true;
67			}
68
69	root	1.51	visibility_base *visible::get_visibility (view &ctx)
70			{
71			view::visibility_map::iterator i = ctx.vismap.find (this);
72			visibility_base *vs;
73
74			if (i == ctx.vismap.end ())
75			{
76			vs = new_visibility ();
77			ctx.vismap.insert (view::visibility_map::value_type (this, vs));
78			}
79			else
80			{
81			vs = i->second;
82
83			if (vs->generation != ctx.generation)
84			{
85			if (vs->generation + 1 != ctx.generation)
86			clear_visibility (vs);
87
88			vs->generation = ctx.generation;
89			}
90			}
91
92			return vs;
93
94			}
95
96	root	1.18	void view::reset_projection ()
97	root	1.1	{
98	root	1.42	renormalize (orig, p);
99	root	1.3
100	root	1.1	glViewport (0, 0, w, h);
101
102			glMatrixMode (GL_PROJECTION);
103			glLoadIdentity ();
104
105			GLdouble aspect = (GLdouble)w/h;
106	root	1.42	GLdouble ymax = z_near * tan (fov * (M_PI / 360.0));
107	root	1.1
108	root	1.42	glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, z_near, z_far);
109	root	1.1
110	root	1.48	perspfact = z_near / ymax * 0.5 * (GLdouble)h;
111
112	root	1.6	d = normalize (d);//D
113			u = normalize (u);//D
114	root	1.41
115	root	1.1	vec3 rz = -d;
116			vec3 rx = cross (u, rz);
117			vec3 ry = cross (rz, rx);
118
119	root	1.17	matrix &m = projection;
120	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
121			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
122			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
123	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
124	root	1.37
125	root	1.38	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
126	root	1.48	//printf ("diagfact = %f\n", diagfact);
127	root	1.41	diagfact = sqrtf (3.);//D WHY???
128	root	1.3
129	root	1.38	glMultMatrixf (m);
130			glTranslatef (-p.x, -p.y, -p.z);
131	root	1.6
132	root	1.38	glGetFloatv (GL_PROJECTION_MATRIX, m);
133	root	1.5
134	root	1.17	frustum.l = plane ( m(3,0) + m(0,0), m(3,1) + m(0,1), m(3,2) + m(0,2), m(3,3) + m(0,3) );
135			frustum.r = plane ( m(3,0) - m(0,0), m(3,1) - m(0,1), m(3,2) - m(0,2), m(3,3) - m(0,3) );
136			frustum.b = plane ( m(3,0) + m(1,0), m(3,1) + m(1,1), m(3,2) + m(1,2), m(3,3) + m(1,3) );
137			frustum.t = plane ( m(3,0) - m(1,0), m(3,1) - m(1,1), m(3,2) - m(1,2), m(3,3) - m(1,3) );
138			frustum.n = plane ( m(3,0) + m(2,0), m(3,1) + m(2,1), m(3,2) + m(2,2), m(3,3) + m(2,3) );
139			frustum.f = plane ( m(3,0) - m(2,0), m(3,1) - m(2,1), m(3,2) - m(2,2), m(3,3) - m(2,3) );
140	root	1.1
141	root	1.13	glMatrixMode (GL_MODELVIEW);
142	root	1.12	glLoadIdentity ();
143	root	1.18	}
144
145			void view::begin ()
146			{
147	root	1.30	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
148
149	root	1.19	vislist.clear ();
150	root	1.18
151			generation++;
152	root	1.12
153	root	1.31	farlist.clear ();
154
155	root	1.37	// check occlusion queries
156			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
157			{
158	root	1.51	occ_query oq(*this, i->data, ::occ_query_result (i->id));
159			i->recv->event (oq);
160	root	1.37	}
161	root	1.20
162	root	1.37	occ_queries.clear ();
163	root	1.18
164	root	1.43	z_far = nz_far;
165			c_far = nc_far;
166	root	1.48
167			if (z_far < z_near)
168			z_far = z_near * 2.;
169
170	root	1.43	reset_projection ();
171
172	root	1.42	nc_far = nz_far = z_near + 1.F;
173	root	1.17	world.detect_visibility (*this);
174	root	1.42
175	root	1.48	printf ("far %f cf %f CAM (%d,%d,%d)\n", z_far, c_far, orig.x, orig.y, orig.z);//D
176	root	1.18	}
177
178			void view::end ()
179			{
180	root	1.40	vislist.clear ();
181	root	1.18	}
182
183	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
184
185	root	1.18	void view::pass (enum mode m)
186			{
187			mode = m;
188
189			glDisable (GL_ALPHA_TEST);
190			glDisable (GL_BLEND);
191	root	1.4
192	root	1.52	switch (mode)
193	root	1.18	{
194	root	1.52	case DEPTH:
195			//glEnable (GL_POLYGON_OFFSET_FILL);
196			//glPolygonOffset (0, 5);
197			glDisable (GL_MINMAX);
198			glDepthRange (DEPTH_OFFSET, 1.);
199			glDepthFunc (GL_LESS);
200			glEnable (GL_DEPTH_TEST);
201			glDisable (GL_LIGHTING);
202			glColorMask (0, 0, 0, 0);
203			glDepthMask (1);
204			break;
205
206			case POSTDEPTH:
207			glEnable (GL_DEPTH_TEST);
208			glColorMask (0, 0, 0, 0);
209			glDepthMask (0);
210			break;
211
212			case LIGHTED:
213			glEnable (GL_MINMAX);
214			//glDisable (GL_POLYGON_OFFSET_FILL);
215			glDepthRange (0., 1. - DEPTH_OFFSET);
216			glDepthFunc (GL_LESS);
217			glColorMask (1, 1, 1, 0);
218			glDepthMask (0);
219			break;
220	root	1.18	}
221
222	root	1.17	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
223	root	1.52	(i)->display (this);
224	root	1.17
225			drawn.clear ();
226	root	1.24
227	root	1.52	#if 0
228	root	1.39	if (mode == view::DEPTH)
229	root	1.25	{
230	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
231	root	1.42	glDepthMask (0);
232	root	1.30	glDepthFunc (GL_LESS);
233	root	1.25
234	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
235			{
236	root	1.48	begin_occ_query (**i);
237	root	1.37	(i)->draw_bbox (this);
238	root	1.48	end_occ_query ();
239	root	1.30	}
240	root	1.27
241			glDisable (GL_DEPTH_CLAMP_NV);
242	root	1.25	}
243	root	1.52	#endif
244	root	1.1	}
245	root	1.6
246	root	1.1