libgender/view.C

#include <cmath>

#include "opengl.h"

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

using namespace gl;

pass pass_depth (0);

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
    glGenQueries (1, &id);

  glBeginQuery (GL_SAMPLES_PASSED, id);
  return id;
}

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

static GLuint occ_query_result (GLuint id)
{
  GLuint count;

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

  return count;
}

view::view ()
: gamma(1.0), nz_near (1.F), nz_far (2.F)
{
}

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 ftan = tan (fov * (.5 * M_PI / 180.));
  GLdouble ymax = z_near * ftan;
  GLdouble xmax = ymax * aspect;

  glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);

  perspfact = z_near / ymax * 0.5F * 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);
  
  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) );

  {
    GLdouble frustlen = z_far - z_near;
    GLdouble fheight  = frustlen * ftan;
    GLdouble fwidth   = fheight * w / h;
    point half (0, 0, z_near + frustlen * .5);
    point corner (fwidth, fheight, frustlen);
    
    frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
  }

  {
    GLdouble depth = h / ftan;

    frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
  }

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();
  glTranslatef (-p.x, -p.y, -p.z);
}

void view::begin ()
{
  generation++;

  vislist.clear ();

  z_near = max (nz_near, 1.F);
  z_far = max (nz_far, z_near * 2.F);
  c_far = nc_far;

  reset_projection ();

  nz_near = 100.;
  nc_far = nz_far = 1.F;
}

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

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

void view::render (enum pass_type p, pass &data)
{
  pass_type = p;
  pass_data = &data;

  switch (pass_type)
    {
      case DEPTH:
        glColorMask (1, 1, 1, 1);
        glDepthMask (1);

        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

        //glEnable (GL_STENCIL_TEST); // for depth-passes
        //glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
        //glStencilFunc (GL_LESS, 1, 255);

        //glEnable (GL_POLYGON_OFFSET_FILL);
        //glPolygonOffset (0, 5);
        glDisable (GL_MINMAX);
        glDepthRange (DEPTH_OFFSET, 1.);
        glDepthFunc (GL_LESS);
        glEnable (GL_DEPTH_TEST);
        glColorMask (0, 0, 0, 0);
        glDisable (GL_DEPTH_CLAMP_NV);

        world.detect_visibility (*this);

        break;

      case POSTDEPTH:
        glDepthRange (0., 1. - DEPTH_OFFSET);
        glDepthFunc (GL_LESS);
        glColorMask (0, 0, 0, 0);
        glDepthMask (0);
        glEnable (GL_DEPTH_CLAMP_NV);
        glDisable (GL_STENCIL_TEST);
       
        // 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 ();

        break;

      case LIGHTED:
        glClear (GL_STENCIL_BUFFER_BIT);
        //glEnable (GL_STENCIL_TEST);
        glEnable (GL_MINMAX);
        glDepthRange (0., 1. - DEPTH_OFFSET);
        glDepthFunc (GL_LESS);
        glColorMask (1, 1, 1, 1);
        glDepthMask (0);
        glDisable (GL_DEPTH_CLAMP_NV);

        break;
    }
  
  for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
    (*i)->display (*this);

  if (pass_type == DEPTH)
    printf ("fps %f NF %f:%f vis %d CAM (%d,%d,%d)\n", timer.fps, z_near, z_far, drawn.size (), orig.x, orig.y, orig.z);//D

  drawn.clear ();

#if 0
  if (pass == 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:	1.68
Committed:	Tue Nov 2 23:26:46 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.67:	+7 -4 lines
Log Message:	* empty log message *
#	Content
1	#include <cmath>
2
3	#include "opengl.h"
4
5	#include "view.h"
6	#include "oct.h"
7
8	using namespace gl;
9
10	pass pass_depth (0);
11
12	vector<GLuint> occ_query_objects;
13
14	static GLuint begin_occ_query ()
15	{
16	GLuint id;
17
18	if (occ_query_objects.size ())
19	{
20	id = *(occ_query_objects.end () - 1);
21	occ_query_objects.pop_back ();
22	}
23	else
24	glGenQueries (1, &id);
25
26	glBeginQuery (GL_SAMPLES_PASSED, id);
27	return id;
28	}
29
30	inline void end_occ_query ()
31	{
32	glEndQuery (GL_SAMPLES_PASSED);
33	}
34
35	static GLuint occ_query_result (GLuint id)
36	{
37	GLuint count;
38
39	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
40	occ_query_objects.push_back (id);
41
42	return count;
43	}
44
45	view::view ()
46	: gamma(1.0), nz_near (1.F), nz_far (2.F)
47	{
48	}
49
50	view::~view ()
51	{
52	}
53
54	void view::begin_occ_query (recv_occ_query &recv, void *id)
55	{
56	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
57	}
58
59	void view::end_occ_query ()
60	{
61	::end_occ_query ();
62	}
63
64	bool view::may_draw (const entity *e)
65	{
66	if (drawn.find (e) != drawn.end ())
67	return false;
68
69	drawn.insert (e);
70	return true;
71	}
72
73	visibility_base *visible::get_visibility (view &ctx)
74	{
75	view::visibility_map::iterator i = ctx.vismap.find (this);
76	visibility_base *vs;
77
78	if (i == ctx.vismap.end ())
79	{
80	vs = new_visibility ();
81	ctx.vismap.insert (view::visibility_map::value_type (this, vs));
82	}
83	else
84	{
85	vs = i->second;
86
87	if (vs->generation != ctx.generation)
88	{
89	if (vs->generation + 1 != ctx.generation)
90	clear_visibility (vs);
91
92	vs->generation = ctx.generation;
93	}
94	}
95
96	return vs;
97	}
98
99	void view::reset_projection ()
100	{
101	renormalize (orig, p);
102
103	glViewport (0, 0, w, h);
104
105	glMatrixMode (GL_PROJECTION);
106	glLoadIdentity ();
107
108	GLdouble aspect = (GLdouble)w/h;
109	GLdouble ftan = tan (fov * (.5 * M_PI / 180.));
110	GLdouble ymax = z_near * ftan;
111	GLdouble xmax = ymax * aspect;
112
113	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
114
115	perspfact = z_near / ymax * 0.5F * h;
116
117	d = normalize (d);//D
118	u = normalize (u);//D
119
120	vec3 rz = -d;
121	vec3 rx = cross (u, rz);
122	vec3 ry = cross (rz, rx);
123
124	matrix &m = projection;
125	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
126	m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
127	m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
128	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
129
130	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
131	//printf ("diagfact = %f\n", diagfact);
132	diagfact = sqrtf (3.);//D WHY???
133
134	glMultMatrixf (m);
135
136	glGetFloatv (GL_PROJECTION_MATRIX, m);
137
138	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) );
139	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) );
140	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) );
141	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) );
142	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) );
143	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) );
144
145	{
146	GLdouble frustlen = z_far - z_near;
147	GLdouble fheight = frustlen * ftan;
148	GLdouble fwidth = fheight * w / h;
149	point half (0, 0, z_near + frustlen * .5);
150	point corner (fwidth, fheight, frustlen);
151
152	frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
153	}
154
155	{
156	GLdouble depth = h / ftan;
157
158	frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
159	}
160
161	glMatrixMode (GL_MODELVIEW);
162	glLoadIdentity ();
163	glTranslatef (-p.x, -p.y, -p.z);
164	}
165
166	void view::begin ()
167	{
168	generation++;
169
170	vislist.clear ();
171
172	z_near = max (nz_near, 1.F);
173	z_far = max (nz_far, z_near * 2.F);
174	c_far = nc_far;
175
176	reset_projection ();
177
178	nz_near = 100.;
179	nc_far = nz_far = 1.F;
180	}
181
182	void view::end ()
183	{
184	vislist.clear ();
185	}
186
187	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
188
189	void view::render (enum pass_type p, pass &data)
190	{
191	pass_type = p;
192	pass_data = &data;
193
194	switch (pass_type)
195	{
196	case DEPTH:
197	glColorMask (1, 1, 1, 1);
198	glDepthMask (1);
199
200	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
201
202	//glEnable (GL_STENCIL_TEST); // for depth-passes
203	//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
204	//glStencilFunc (GL_LESS, 1, 255);
205
206	//glEnable (GL_POLYGON_OFFSET_FILL);
207	//glPolygonOffset (0, 5);
208	glDisable (GL_MINMAX);
209	glDepthRange (DEPTH_OFFSET, 1.);
210	glDepthFunc (GL_LESS);
211	glEnable (GL_DEPTH_TEST);
212	glColorMask (0, 0, 0, 0);
213	glDisable (GL_DEPTH_CLAMP_NV);
214
215	world.detect_visibility (*this);
216
217	break;
218
219	case POSTDEPTH:
220	glDepthRange (0., 1. - DEPTH_OFFSET);
221	glDepthFunc (GL_LESS);
222	glColorMask (0, 0, 0, 0);
223	glDepthMask (0);
224	glEnable (GL_DEPTH_CLAMP_NV);
225	glDisable (GL_STENCIL_TEST);
226
227	// check occlusion queries
228	for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
229	{
230	occ_query oq(*this, i->data, ::occ_query_result (i->id));
231	i->recv->event (oq);
232	}
233
234	occ_queries.clear ();
235
236	break;
237
238	case LIGHTED:
239	glClear (GL_STENCIL_BUFFER_BIT);
240	//glEnable (GL_STENCIL_TEST);
241	glEnable (GL_MINMAX);
242	glDepthRange (0., 1. - DEPTH_OFFSET);
243	glDepthFunc (GL_LESS);
244	glColorMask (1, 1, 1, 1);
245	glDepthMask (0);
246	glDisable (GL_DEPTH_CLAMP_NV);
247
248	break;
249	}
250
251	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
252	(i)->display (this);
253
254	if (pass_type == DEPTH)
255	printf ("fps %f NF %f:%f vis %d CAM (%d,%d,%d)\n", timer.fps, z_near, z_far, drawn.size (), orig.x, orig.y, orig.z);//D
256
257	drawn.clear ();
258
259	#if 0
260	if (pass == view::DEPTH)
261	{
262	glEnable (GL_DEPTH_CLAMP_NV);
263	glDepthMask (0);
264	glDepthFunc (GL_LESS);
265
266	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
267	{
268	begin_occ_query (**i);
269	(i)->draw_bbox (this);
270	end_occ_query ();
271	}
272
273	glDisable (GL_DEPTH_CLAMP_NV);
274	}
275	#endif
276	}
277
278