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
    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), 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 = 1e37;
  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:	1.63
Committed:	Tue Oct 19 18:44:07 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.62:	+13 -6 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			glGenQueriesARB (1, &id);
23
24			glBeginQueryARB (GL_SAMPLES_PASSED, id);
25			return id;
26			}
27
28			inline void end_occ_query ()
29			{
30			glEndQueryARB (GL_SAMPLES_PASSED);
31			}
32
33			static GLuint occ_query_result (GLuint id)
34			{
35			GLuint count;
36
37			glGetQueryObjectuivARB (id, GL_QUERY_RESULT, &count);
38			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
98	root	1.18	void view::reset_projection ()
99	root	1.1	{
100	root	1.42	renormalize (orig, p);
101	root	1.3
102	root	1.1	glViewport (0, 0, w, h);
103
104			glMatrixMode (GL_PROJECTION);
105			glLoadIdentity ();
106
107			GLdouble aspect = (GLdouble)w/h;
108	root	1.59	GLdouble ftan = tan (fov * (.5 * M_PI / 180.));
109			GLdouble ymax = z_near * ftan;
110			GLdouble xmax = ymax * aspect;
111	root	1.1
112	root	1.59	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
113	root	1.1
114	root	1.59	perspfact = z_near / ymax * 0.5F * h;
115	root	1.48
116	root	1.6	d = normalize (d);//D
117			u = normalize (u);//D
118	root	1.41
119	root	1.1	vec3 rz = -d;
120			vec3 rx = cross (u, rz);
121			vec3 ry = cross (rz, rx);
122
123	root	1.17	matrix &m = projection;
124	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
125			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
126			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
127	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
128	root	1.37
129	root	1.38	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
130	root	1.48	//printf ("diagfact = %f\n", diagfact);
131	root	1.41	diagfact = sqrtf (3.);//D WHY???
132	root	1.3
133	root	1.38	glMultMatrixf (m);
134			glTranslatef (-p.x, -p.y, -p.z);
135	root	1.63
136	root	1.38	glGetFloatv (GL_PROJECTION_MATRIX, m);
137	root	1.5
138	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) );
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	root	1.1
145	root	1.59	{
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	root	1.13	glMatrixMode (GL_MODELVIEW);
162	root	1.12	glLoadIdentity ();
163	root	1.18	}
164
165			void view::begin ()
166			{
167	root	1.53	generation++;
168
169	root	1.19	vislist.clear ();
170	root	1.18
171	root	1.60	z_near = max (nz_near, 1.F);
172			z_far = max (nz_far, z_near * 2.F);
173	root	1.43	c_far = nc_far;
174	root	1.48
175	root	1.43	reset_projection ();
176
177	root	1.60	nz_near = 1e37;
178			nc_far = nz_far = 1.F;
179	root	1.18	}
180
181			void view::end ()
182			{
183	root	1.40	vislist.clear ();
184	root	1.18	}
185
186	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
187
188	root	1.56	void view::render (enum pass p)
189	root	1.18	{
190	root	1.56	pass = p;
191	root	1.18
192	root	1.56	switch (pass)
193	root	1.18	{
194	root	1.52	case DEPTH:
195	root	1.63	glColorMask (1, 1, 1, 1);
196			glDepthMask (1);
197
198			glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
199
200			//glEnable (GL_STENCIL_TEST); // for depth-passes
201			//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
202			//glStencilFunc (GL_LESS, 1, 255);
203
204	root	1.52	//glEnable (GL_POLYGON_OFFSET_FILL);
205			//glPolygonOffset (0, 5);
206			glDisable (GL_MINMAX);
207			glDepthRange (DEPTH_OFFSET, 1.);
208			glDepthFunc (GL_LESS);
209			glEnable (GL_DEPTH_TEST);
210			glColorMask (0, 0, 0, 0);
211	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
212	root	1.54
213	root	1.61	world.detect_visibility (*this);
214	root	1.54
215	root	1.52	break;
216
217			case POSTDEPTH:
218	root	1.59	glDepthRange (0., 1. - DEPTH_OFFSET);
219	root	1.57	glDepthFunc (GL_LESS);
220	root	1.52	glColorMask (0, 0, 0, 0);
221			glDepthMask (0);
222	root	1.59	glEnable (GL_DEPTH_CLAMP_NV);
223	root	1.63	glDisable (GL_STENCIL_TEST);
224	root	1.53
225			// check occlusion queries
226			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
227			{
228			occ_query oq(*this, i->data, ::occ_query_result (i->id));
229			i->recv->event (oq);
230			}
231
232			occ_queries.clear ();
233
234	root	1.52	break;
235
236			case LIGHTED:
237	root	1.63	glClear (GL_STENCIL_BUFFER_BIT);
238			//glEnable (GL_STENCIL_TEST);
239	root	1.52	glEnable (GL_MINMAX);
240			glDepthRange (0., 1. - DEPTH_OFFSET);
241			glDepthFunc (GL_LESS);
242	root	1.53	glColorMask (1, 1, 1, 1);
243	root	1.52	glDepthMask (0);
244	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
245	root	1.54
246	root	1.52	break;
247	root	1.18	}
248
249	root	1.61	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
250			(i)->display (this);
251	root	1.62
252			if (pass == LIGHTED)
253			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
254	root	1.61
255	root	1.56	drawn.clear ();
256
257	root	1.52	#if 0
258	root	1.56	if (pass == view::DEPTH)
259	root	1.25	{
260	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
261	root	1.42	glDepthMask (0);
262	root	1.30	glDepthFunc (GL_LESS);
263	root	1.25
264	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
265			{
266	root	1.48	begin_occ_query (**i);
267	root	1.37	(i)->draw_bbox (this);
268	root	1.48	end_occ_query ();
269	root	1.30	}
270	root	1.27
271			glDisable (GL_DEPTH_CLAMP_NV);
272	root	1.25	}
273	root	1.52	#endif
274	root	1.1	}
275	root	1.6
276	root	1.1