libgender/view.C

#include <cmath>

#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glext.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 = near * tan (fov * (M_PI / 360.0));
  glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, near, far);

  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);

  glMultMatrixf ((GLfloat *)m.data);

  glGetFloatv (GL_PROJECTION_MATRIX, (GLfloat *)&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 ();
  glTranslatef (-p.x, -p.y, -p.z);
}

void view::begin ()
{
  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glDepthRange (0, 1. - (1. / pow (2., 16.)));

  vismap.clear ();
  vislist.clear ();

  generation++;

  reset_projection ();

  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 ();

  world.detect_visibility (*this);
}

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

void view::pass (enum mode m)
{
  mode = m;

  glDisable (GL_ALPHA_TEST);
  glDisable (GL_BLEND);

  if (mode == view::DEPTH)
    {
      glEnable (GL_POLYGON_OFFSET_FILL);
      glPolygonOffset (0, 1);
      glDepthFunc (GL_LESS);
      glDisable (GL_LIGHTING);
      glColorMask (0, 0, 0, 0);
      cgGLEnableProfile (vsh_profile);// z-fighting??
      cgGLDisableProfile (fsh_profile);
    }
  else
    {
      glEnable (GL_MINMAX);
      glDisable (GL_POLYGON_OFFSET_FILL);
      glDepthFunc (GL_LESS);
      glDepthMask (0);
      cgGLEnableProfile (vsh_profile);
      cgGLEnableProfile (fsh_profile);
    }
  
  for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
    (*i)->display (*this);

  drawn.clear ();

  if (mode == view::DEPTH || 1)
    {
      glEnable (GL_DEPTH_CLAMP_NV);
      glDepthFunc (GL_LESS);
      if (mode == view::LIGHTED) glDepthFunc (GL_LEQUAL);
      glDisable (GL_LIGHTING);
      cgGLDisableProfile (vsh_profile);
      cgGLDisableProfile (fsh_profile);
      //glShadeModel (GL_FLAT);

#if 0
      static int count; count++;
      if (farlist.size ())
        printf ("%d: size %d\n", count, farlist.size ());
#endif

      for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
        {
          if (mode == view::DEPTH) begin_occ_query (**i);
          if (mode == view::LIGHTED) glColor3f (1,0,0);
          (*i)->draw_bbox (*this);
          if (mode == view::DEPTH) end_occ_query ();
       }

      glEnable (GL_DEPTH_TEST);
      glDisable (GL_DEPTH_CLAMP_NV);
      //glShadeModel (GL_SMOOTH);
    }

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

}


Revision:	1.37
Committed:	Sat Oct 9 16:36:31 2004 UTC (19 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.36:	+65 -33 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cmath>
2
3	root	1.37	#define GL_GLEXT_PROTOTYPES
4	root	1.26	#include <GL/gl.h>
5			#include <GL/glext.h>
6
7	root	1.37	#include "view.h"
8	root	1.1	#include "oct.h"
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	1.18	: gamma(1.0)
45	root	1.1	{
46			}
47
48	root	1.17	view::~view ()
49	root	1.1	{
50			}
51
52	root	1.37	void view::begin_occ_query (recv_occ_query &recv)
53			{
54			occ_queries.push_back (oq_data (&recv, ::begin_occ_query ()));
55			}
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	1.18	void view::reset_projection ()
72	root	1.1	{
73	root	1.5	renormalize (orig, p);
74	root	1.3
75	root	1.1	glViewport (0, 0, w, h);
76
77			glMatrixMode (GL_PROJECTION);
78			glLoadIdentity ();
79
80			GLdouble aspect = (GLdouble)w/h;
81
82	root	1.37	GLdouble ymax = near * tan (fov * (M_PI / 360.0));
83			glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, near, far);
84	root	1.1
85	root	1.6	d = normalize (d);//D
86			u = normalize (u);//D
87	root	1.1	vec3 rz = -d;
88			vec3 rx = cross (u, rz);
89			vec3 ry = cross (rz, rx);
90
91	root	1.17	matrix &m = projection;
92	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
93			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
94			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
95	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
96	root	1.37
97			diagfact = abs(rz.x) + abs(rz.y) + abs(rz.z);
98	root	1.3
99			glMultMatrixf ((GLfloat *)m.data);
100	root	1.6
101	root	1.5	glGetFloatv (GL_PROJECTION_MATRIX, (GLfloat *)&m);
102
103	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) );
104			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) );
105			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) );
106			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) );
107			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) );
108			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) );
109	root	1.1
110	root	1.13	glMatrixMode (GL_MODELVIEW);
111	root	1.12	glLoadIdentity ();
112	root	1.16	glTranslatef (-p.x, -p.y, -p.z);
113	root	1.18	}
114
115			void view::begin ()
116			{
117	root	1.30	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
118			glDepthRange (0, 1. - (1. / pow (2., 16.)));
119
120	root	1.18	vismap.clear ();
121	root	1.19	vislist.clear ();
122	root	1.18
123			generation++;
124	root	1.12
125	root	1.18	reset_projection ();
126
127	root	1.31	farlist.clear ();
128
129	root	1.37	// check occlusion queries
130			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
131			{
132			occ_query oq(*this, i->second, occ_query_result (i->second));
133			i->first->event (oq);
134			}
135	root	1.20
136	root	1.37	occ_queries.clear ();
137	root	1.18
138	root	1.17	world.detect_visibility (*this);
139	root	1.18	}
140
141			void view::end ()
142			{
143			vismap.clear ();
144			}
145
146			void view::pass (enum mode m)
147			{
148			mode = m;
149
150			glDisable (GL_ALPHA_TEST);
151			glDisable (GL_BLEND);
152	root	1.4
153	root	1.18	if (mode == view::DEPTH)
154			{
155			glEnable (GL_POLYGON_OFFSET_FILL);
156			glPolygonOffset (0, 1);
157			glDepthFunc (GL_LESS);
158			glDisable (GL_LIGHTING);
159			glColorMask (0, 0, 0, 0);
160	root	1.24	cgGLEnableProfile (vsh_profile);// z-fighting??
161	root	1.23	cgGLDisableProfile (fsh_profile);
162	root	1.18	}
163			else
164			{
165			glEnable (GL_MINMAX);
166			glDisable (GL_POLYGON_OFFSET_FILL);
167			glDepthFunc (GL_LESS);
168			glDepthMask (0);
169	root	1.23	cgGLEnableProfile (vsh_profile);
170			cgGLEnableProfile (fsh_profile);
171	root	1.18	}
172
173	root	1.17	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
174			(i)->display (this);
175
176			drawn.clear ();
177	root	1.24
178	root	1.35	if (mode == view::DEPTH \|\| 1)
179	root	1.25	{
180	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
181	root	1.30	glDepthFunc (GL_LESS);
182	root	1.37	if (mode == view::LIGHTED) glDepthFunc (GL_LEQUAL);
183	root	1.30	glDisable (GL_LIGHTING);
184	root	1.27	cgGLDisableProfile (vsh_profile);
185			cgGLDisableProfile (fsh_profile);
186	root	1.37	//glShadeModel (GL_FLAT);
187	root	1.27
188	root	1.33	#if 0
189	root	1.25	static int count; count++;
190			if (farlist.size ())
191			printf ("%d: size %d\n", count, farlist.size ());
192	root	1.33	#endif
193	root	1.25
194	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
195			{
196			if (mode == view::DEPTH) begin_occ_query (**i);
197			if (mode == view::LIGHTED) glColor3f (1,0,0);
198			(i)->draw_bbox (this);
199			if (mode == view::DEPTH) end_occ_query ();
200	root	1.30	}
201	root	1.27
202			glEnable (GL_DEPTH_TEST);
203			glDisable (GL_DEPTH_CLAMP_NV);
204	root	1.37	//glShadeModel (GL_SMOOTH);
205	root	1.25	}
206	root	1.4
207			glColorMask (1, 1, 1, 0);
208			glDepthMask (1);
209	root	1.27
210	root	1.1	}
211	root	1.6
212	root	1.1