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)
{
  occ_queries.push_back (oq_data (&recv, ::begin_occ_query ()));
}

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;
}

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->second, ::occ_query_result (i->second));
      i->first->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);
  //glDisable (GL_DEPTH_TEST);

  if (mode == view::DEPTH)
    {
      //glEnable (GL_POLYGON_OFFSET_FILL);
      //glPolygonOffset (0, 5);
      glDepthRange (DEPTH_OFFSET, 1.);
      glDepthFunc (GL_LESS);
      glDisable (GL_LIGHTING);
      glColorMask (0, 0, 0, 0);
    }
  else
    {
      glEnable (GL_MINMAX);
      //glDisable (GL_POLYGON_OFFSET_FILL);
      glDepthRange (0., 1. - DEPTH_OFFSET);
      glDepthFunc (GL_LESS);
      glDepthMask (0);
    }
  
  for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
    {
      octant *o = *i;

      visibility_state &vs = vismap[o];
      bool oq = mode == LIGHTED
                && vs.last + 1. < timer.now
                && (vs.visibility == visibility_state::PARTIAL
                    || vs.visibility == visibility_state::FULL);

      if (oq)
        begin_occ_query (*o);

      o->display (*this);

      if (oq) // && o->fill) WHY???
        {
          glColorMask (0, 0, 0, 0);
          o->draw_bbox (*this);
          glColorMask (1, 1, 1, 0);
        }

      if (oq)
        end_occ_query ();
    }

  drawn.clear ();

  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);
    }

  glColorMask (1, 1, 1, 0);
  glDepthMask (1);
}


Revision:	1.50
Committed:	Thu Oct 14 19:54:14 2004 UTC (19 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.49:	+7 -9 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	1.37	void view::begin_occ_query (recv_occ_query &recv)
51			{
52			occ_queries.push_back (oq_data (&recv, ::begin_occ_query ()));
53			}
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	1.18	void view::reset_projection ()
70	root	1.1	{
71	root	1.42	renormalize (orig, p);
72	root	1.3
73	root	1.1	glViewport (0, 0, w, h);
74
75			glMatrixMode (GL_PROJECTION);
76			glLoadIdentity ();
77
78			GLdouble aspect = (GLdouble)w/h;
79	root	1.42	GLdouble ymax = z_near * tan (fov * (M_PI / 360.0));
80	root	1.1
81	root	1.42	glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, z_near, z_far);
82	root	1.1
83	root	1.48	perspfact = z_near / ymax * 0.5 * (GLdouble)h;
84
85	root	1.6	d = normalize (d);//D
86			u = normalize (u);//D
87	root	1.41
88	root	1.1	vec3 rz = -d;
89			vec3 rx = cross (u, rz);
90			vec3 ry = cross (rz, rx);
91
92	root	1.17	matrix &m = projection;
93	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
94			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
95			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
96	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
97	root	1.37
98	root	1.38	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
99	root	1.48	//printf ("diagfact = %f\n", diagfact);
100	root	1.41	diagfact = sqrtf (3.);//D WHY???
101	root	1.3
102	root	1.38	glMultMatrixf (m);
103			glTranslatef (-p.x, -p.y, -p.z);
104	root	1.6
105	root	1.38	glGetFloatv (GL_PROJECTION_MATRIX, m);
106	root	1.5
107	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) );
108			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) );
109			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) );
110			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) );
111			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) );
112			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) );
113	root	1.1
114	root	1.13	glMatrixMode (GL_MODELVIEW);
115	root	1.12	glLoadIdentity ();
116	root	1.18	}
117
118			void view::begin ()
119			{
120	root	1.30	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
121
122	root	1.19	vislist.clear ();
123	root	1.18
124			generation++;
125	root	1.12
126	root	1.31	farlist.clear ();
127
128	root	1.37	// check occlusion queries
129			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
130			{
131	root	1.46	occ_query oq(*this, i->second, ::occ_query_result (i->second));
132	root	1.37	i->first->event (oq);
133			}
134	root	1.20
135	root	1.37	occ_queries.clear ();
136	root	1.18
137	root	1.43	z_far = nz_far;
138			c_far = nc_far;
139	root	1.48
140			if (z_far < z_near)
141			z_far = z_near * 2.;
142
143	root	1.43	reset_projection ();
144
145	root	1.42	nc_far = nz_far = z_near + 1.F;
146	root	1.17	world.detect_visibility (*this);
147	root	1.42
148	root	1.48	printf ("far %f cf %f CAM (%d,%d,%d)\n", z_far, c_far, orig.x, orig.y, orig.z);//D
149	root	1.18	}
150
151			void view::end ()
152			{
153	root	1.40	vislist.clear ();
154	root	1.18	}
155
156	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
157
158	root	1.18	void view::pass (enum mode m)
159			{
160			mode = m;
161
162			glDisable (GL_ALPHA_TEST);
163			glDisable (GL_BLEND);
164	root	1.49	//glDisable (GL_DEPTH_TEST);
165	root	1.4
166	root	1.18	if (mode == view::DEPTH)
167			{
168	root	1.50	//glEnable (GL_POLYGON_OFFSET_FILL);
169			//glPolygonOffset (0, 5);
170			glDepthRange (DEPTH_OFFSET, 1.);
171	root	1.18	glDepthFunc (GL_LESS);
172			glDisable (GL_LIGHTING);
173			glColorMask (0, 0, 0, 0);
174			}
175			else
176			{
177			glEnable (GL_MINMAX);
178	root	1.50	//glDisable (GL_POLYGON_OFFSET_FILL);
179			glDepthRange (0., 1. - DEPTH_OFFSET);
180	root	1.18	glDepthFunc (GL_LESS);
181	root	1.46	glDepthMask (0);
182	root	1.18	}
183
184	root	1.17	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
185	root	1.40	{
186	root	1.48	octant o = i;
187
188			visibility_state &vs = vismap[o];
189	root	1.44	bool oq = mode == LIGHTED
190			&& vs.last + 1. < timer.now
191			&& (vs.visibility == visibility_state::PARTIAL
192			\|\| vs.visibility == visibility_state::FULL);
193	root	1.40
194			if (oq)
195	root	1.48	begin_occ_query (*o);
196	root	1.40
197	root	1.48	o->display (*this);
198	root	1.46
199	root	1.48	if (oq) // && o->fill) WHY???
200	root	1.46	{
201			glColorMask (0, 0, 0, 0);
202	root	1.48	o->draw_bbox (*this);
203	root	1.46	glColorMask (1, 1, 1, 0);
204			}
205	root	1.40
206			if (oq)
207			end_occ_query ();
208			}
209	root	1.17
210			drawn.clear ();
211	root	1.24
212	root	1.39	if (mode == view::DEPTH)
213	root	1.25	{
214	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
215	root	1.42	glDepthMask (0);
216	root	1.30	glDepthFunc (GL_LESS);
217	root	1.25
218	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
219			{
220	root	1.48	begin_occ_query (**i);
221	root	1.37	(i)->draw_bbox (this);
222	root	1.48	end_occ_query ();
223	root	1.30	}
224	root	1.27
225			glDisable (GL_DEPTH_CLAMP_NV);
226	root	1.25	}
227	root	1.4
228			glColorMask (1, 1, 1, 0);
229			glDepthMask (1);
230	root	1.1	}
231	root	1.6
232	root	1.1