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, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.65:	+4 -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	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	glGenQueries (1, &id);
23
24	glBeginQuery (GL_SAMPLES_PASSED, id);
25	return id;
26	}
27
28	inline void end_occ_query ()
29	{
30	glEndQuery (GL_SAMPLES_PASSED);
31	}
32
33	static GLuint occ_query_result (GLuint id)
34	{
35	GLuint count;
36
37	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
38	occ_query_objects.push_back (id);
39
40	return count;
41	}
42
43	view::view ()
44	: gamma(1.0), nz_near (1.F), nz_far (2.F)
45	{
46	}
47
48	view::~view ()
49	{
50	}
51
52	void view::begin_occ_query (recv_occ_query &recv, void *id)
53	{
54	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
55	}
56
57	void view::end_occ_query ()
58	{
59	::end_occ_query ();
60	}
61
62	bool view::may_draw (const entity *e)
63	{
64	if (drawn.find (e) != drawn.end ())
65	return false;
66
67	drawn.insert (e);
68	return true;
69	}
70
71	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	void view::reset_projection ()
98	{
99	renormalize (orig, p);
100
101	glViewport (0, 0, w, h);
102
103	glMatrixMode (GL_PROJECTION);
104	glLoadIdentity ();
105
106	GLdouble aspect = (GLdouble)w/h;
107	GLdouble ftan = tan (fov * (.5 * M_PI / 180.));
108	GLdouble ymax = z_near * ftan;
109	GLdouble xmax = ymax * aspect;
110
111	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
112
113	perspfact = z_near / ymax * 0.5F * h;
114
115	d = normalize (d);//D
116	u = normalize (u);//D
117
118	vec3 rz = -d;
119	vec3 rx = cross (u, rz);
120	vec3 ry = cross (rz, rx);
121
122	matrix &m = projection;
123	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	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
127
128	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
129	//printf ("diagfact = %f\n", diagfact);
130	diagfact = sqrtf (3.);//D WHY???
131
132	glMultMatrixf (m);
133	glTranslatef (-p.x, -p.y, -p.z);
134
135	glGetFloatv (GL_PROJECTION_MATRIX, m);
136
137	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
144	{
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	glMatrixMode (GL_MODELVIEW);
161	glLoadIdentity ();
162	}
163
164	void view::begin ()
165	{
166	generation++;
167
168	vislist.clear ();
169
170	z_near = max (nz_near, 1.F);
171	z_far = max (nz_far, z_near * 2.F);
172	c_far = nc_far;
173
174	reset_projection ();
175
176	nz_near = 100.;
177	nc_far = nz_far = 1.F;
178	}
179
180	void view::end ()
181	{
182	vislist.clear ();
183	}
184
185	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
186
187	void view::render (enum pass p)
188	{
189	pass = p;
190
191	switch (pass)
192	{
193	case DEPTH:
194	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	//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	glDisable (GL_DEPTH_CLAMP_NV);
211
212	world.detect_visibility (*this);
213
214	break;
215
216	case POSTDEPTH:
217	glDepthRange (0., 1. - DEPTH_OFFSET);
218	glDepthFunc (GL_LESS);
219	glColorMask (0, 0, 0, 0);
220	glDepthMask (0);
221	glEnable (GL_DEPTH_CLAMP_NV);
222	glDisable (GL_STENCIL_TEST);
223
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	break;
234
235	case LIGHTED:
236	glClear (GL_STENCIL_BUFFER_BIT);
237	//glEnable (GL_STENCIL_TEST);
238	glEnable (GL_MINMAX);
239	glDepthRange (0., 1. - DEPTH_OFFSET);
240	glDepthFunc (GL_LESS);
241	glColorMask (1, 1, 1, 1);
242	glDepthMask (0);
243	glDisable (GL_DEPTH_CLAMP_NV);
244
245	break;
246	}
247
248	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
249	(i)->display (this);
250
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
254	drawn.clear ();
255
256	#if 0
257	if (pass == view::DEPTH)
258	{
259	glEnable (GL_DEPTH_CLAMP_NV);
260	glDepthMask (0);
261	glDepthFunc (GL_LESS);
262
263	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
264	{
265	begin_occ_query (**i);
266	(i)->draw_bbox (this);
267	end_occ_query ();
268	}
269
270	glDisable (GL_DEPTH_CLAMP_NV);
271	}
272	#endif
273	}
274
275