libgender/view.C

#include <cmath>

#include "opengl.h"

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

using namespace gl;

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);
  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) );

  {
    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 ();
}

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 p)
{
  pass = p;

  switch (pass)
    {
      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 == LIGHTED)
    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:	1.66
Committed:	Fri Oct 29 23:27:02 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.65:	+4 -4 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	1.55	using namespace gl;
9
10	root	1.37	vector<GLuint> occ_query_objects;
11
12			static GLuint begin_occ_query ()
13			{
14			GLuint id;
15
16			if (occ_query_objects.size ())
17			{
18			id = *(occ_query_objects.end () - 1);
19			occ_query_objects.pop_back ();
20			}
21			else
22	root	1.66	glGenQueries (1, &id);
23	root	1.37
24	root	1.66	glBeginQuery (GL_SAMPLES_PASSED, id);
25	root	1.37	return id;
26			}
27
28			inline void end_occ_query ()
29			{
30	root	1.66	glEndQuery (GL_SAMPLES_PASSED);
31	root	1.37	}
32
33			static GLuint occ_query_result (GLuint id)
34			{
35			GLuint count;
36
37	root	1.66	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
38	root	1.37	occ_query_objects.push_back (id);
39
40			return count;
41			}
42
43	root	1.17	view::view ()
44	root	1.60	: gamma(1.0), nz_near (1.F), nz_far (2.F)
45	root	1.1	{
46			}
47
48	root	1.17	view::~view ()
49	root	1.1	{
50			}
51
52	root	1.51	void view::begin_occ_query (recv_occ_query &recv, void *id)
53	root	1.37	{
54	root	1.51	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
55	root	1.37	}
56
57			void view::end_occ_query ()
58			{
59			::end_occ_query ();
60			}
61
62	root	1.34	bool view::may_draw (const entity *e)
63	root	1.1	{
64			if (drawn.find (e) != drawn.end ())
65			return false;
66
67			drawn.insert (e);
68			return true;
69			}
70
71	root	1.51	visibility_base *visible::get_visibility (view &ctx)
72			{
73			view::visibility_map::iterator i = ctx.vismap.find (this);
74			visibility_base *vs;
75
76			if (i == ctx.vismap.end ())
77			{
78			vs = new_visibility ();
79			ctx.vismap.insert (view::visibility_map::value_type (this, vs));
80			}
81			else
82			{
83			vs = i->second;
84
85			if (vs->generation != ctx.generation)
86			{
87			if (vs->generation + 1 != ctx.generation)
88			clear_visibility (vs);
89
90			vs->generation = ctx.generation;
91			}
92			}
93
94			return vs;
95			}
96
97	root	1.18	void view::reset_projection ()
98	root	1.1	{
99	root	1.42	renormalize (orig, p);
100	root	1.3
101	root	1.1	glViewport (0, 0, w, h);
102
103			glMatrixMode (GL_PROJECTION);
104			glLoadIdentity ();
105
106			GLdouble aspect = (GLdouble)w/h;
107	root	1.59	GLdouble ftan = tan (fov * (.5 * M_PI / 180.));
108			GLdouble ymax = z_near * ftan;
109			GLdouble xmax = ymax * aspect;
110	root	1.1
111	root	1.59	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
112	root	1.1
113	root	1.59	perspfact = z_near / ymax * 0.5F * h;
114	root	1.48
115	root	1.6	d = normalize (d);//D
116			u = normalize (u);//D
117	root	1.41
118	root	1.1	vec3 rz = -d;
119			vec3 rx = cross (u, rz);
120			vec3 ry = cross (rz, rx);
121
122	root	1.17	matrix &m = projection;
123	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
124			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
125			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
126	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
127	root	1.37
128	root	1.38	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
129	root	1.48	//printf ("diagfact = %f\n", diagfact);
130	root	1.41	diagfact = sqrtf (3.);//D WHY???
131	root	1.3
132	root	1.38	glMultMatrixf (m);
133			glTranslatef (-p.x, -p.y, -p.z);
134	root	1.63
135	root	1.38	glGetFloatv (GL_PROJECTION_MATRIX, m);
136	root	1.5
137	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) );
138			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) );
139			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) );
140			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) );
141			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) );
142			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) );
143	root	1.1
144	root	1.59	{
145			GLdouble frustlen = z_far - z_near;
146			GLdouble fheight = frustlen * ftan;
147			GLdouble fwidth = fheight * w / h;
148			point half (0, 0, z_near + frustlen * .5);
149			point corner (fwidth, fheight, frustlen);
150
151			frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
152			}
153
154			{
155			GLdouble depth = h / ftan;
156
157			frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
158			}
159
160	root	1.13	glMatrixMode (GL_MODELVIEW);
161	root	1.12	glLoadIdentity ();
162	root	1.18	}
163
164			void view::begin ()
165			{
166	root	1.53	generation++;
167
168	root	1.19	vislist.clear ();
169	root	1.18
170	root	1.60	z_near = max (nz_near, 1.F);
171			z_far = max (nz_far, z_near * 2.F);
172	root	1.43	c_far = nc_far;
173	root	1.48
174	root	1.43	reset_projection ();
175
176	root	1.65	nz_near = 100.;
177	root	1.60	nc_far = nz_far = 1.F;
178	root	1.18	}
179
180			void view::end ()
181			{
182	root	1.40	vislist.clear ();
183	root	1.18	}
184
185	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
186
187	root	1.56	void view::render (enum pass p)
188	root	1.18	{
189	root	1.56	pass = p;
190	root	1.18
191	root	1.56	switch (pass)
192	root	1.18	{
193	root	1.52	case DEPTH:
194	root	1.63	glColorMask (1, 1, 1, 1);
195			glDepthMask (1);
196
197			glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
198
199			//glEnable (GL_STENCIL_TEST); // for depth-passes
200			//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
201			//glStencilFunc (GL_LESS, 1, 255);
202
203	root	1.52	//glEnable (GL_POLYGON_OFFSET_FILL);
204			//glPolygonOffset (0, 5);
205			glDisable (GL_MINMAX);
206			glDepthRange (DEPTH_OFFSET, 1.);
207			glDepthFunc (GL_LESS);
208			glEnable (GL_DEPTH_TEST);
209			glColorMask (0, 0, 0, 0);
210	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
211	root	1.54
212	root	1.61	world.detect_visibility (*this);
213	root	1.54
214	root	1.52	break;
215
216			case POSTDEPTH:
217	root	1.59	glDepthRange (0., 1. - DEPTH_OFFSET);
218	root	1.57	glDepthFunc (GL_LESS);
219	root	1.52	glColorMask (0, 0, 0, 0);
220			glDepthMask (0);
221	root	1.59	glEnable (GL_DEPTH_CLAMP_NV);
222	root	1.63	glDisable (GL_STENCIL_TEST);
223	root	1.53
224			// check occlusion queries
225			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
226			{
227			occ_query oq(*this, i->data, ::occ_query_result (i->id));
228			i->recv->event (oq);
229			}
230
231			occ_queries.clear ();
232
233	root	1.52	break;
234
235			case LIGHTED:
236	root	1.63	glClear (GL_STENCIL_BUFFER_BIT);
237			//glEnable (GL_STENCIL_TEST);
238	root	1.52	glEnable (GL_MINMAX);
239			glDepthRange (0., 1. - DEPTH_OFFSET);
240			glDepthFunc (GL_LESS);
241	root	1.53	glColorMask (1, 1, 1, 1);
242	root	1.52	glDepthMask (0);
243	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
244	root	1.54
245	root	1.52	break;
246	root	1.18	}
247
248	root	1.61	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
249			(i)->display (this);
250	root	1.62
251			if (pass == LIGHTED)
252			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
253	root	1.61
254	root	1.56	drawn.clear ();
255
256	root	1.52	#if 0
257	root	1.56	if (pass == view::DEPTH)
258	root	1.25	{
259	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
260	root	1.42	glDepthMask (0);
261	root	1.30	glDepthFunc (GL_LESS);
262	root	1.25
263	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
264			{
265	root	1.48	begin_occ_query (**i);
266	root	1.37	(i)->draw_bbox (this);
267	root	1.48	end_occ_query ();
268	root	1.30	}
269	root	1.27
270			glDisable (GL_DEPTH_CLAMP_NV);
271	root	1.25	}
272	root	1.52	#endif
273	root	1.1	}
274	root	1.6
275	root	1.1