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;

  matrix perspective;
#if 0
  {
    matrix &m = perspective;
    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;

    LoadMatrixf (perspective);
  }
#else
  glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
#endif

  glGetFloatv (GL_PROJECTION_MATRIX, perspective);

  perspfact = z_near / ymax * 0.5F * h;

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();
  matrix &m = projection;

  d = normalize (d);//D
  u = normalize (u);//D

  vec3 rz = -d;
  vec3 rx = cross (u, rz);
  vec3 ry = cross (rz, rx);

  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_MODELVIEW_MATRIX, m);

  m = perspective * 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));
  }

  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
}

void light::enable ()
{
  lightpos->set (p);
}

void light::disable ()
{
}

static shader::varying_1f camdist;
static shader::varying_3f lightvec;

void linear_light::vsh ()
{
  using namespace shader::compile;

  lightvec = xyz (lightpos - model_view_matrix * vin.vertex);
  camdist = max (1 - length (lightvec) / radius, 0);

  fsh ();
}

void linear_light::fsh ()
{
  using namespace shader::compile;

  sh_lightvec = lightvec;
  sh_colour = float3 (c.r / 255.F, c.g / 255.F, c.b / 255.F) * (min (intensity * camdist * 0.6F + 0.9F, 1.F));
}


Revision:	1.73
Committed:	Sat Nov 6 00:06:33 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.72:	+5 -5 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	matrix perspective;
114	#if 0
115	{
116	matrix &m = perspective;
117	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
118	m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
119	m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
120	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
121
122	LoadMatrixf (perspective);
123	}
124	#else
125	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
126	#endif
127
128	glGetFloatv (GL_PROJECTION_MATRIX, perspective);
129
130	perspfact = z_near / ymax * 0.5F * h;
131
132	glMatrixMode (GL_MODELVIEW);
133	glLoadIdentity ();
134	matrix &m = projection;
135
136	d = normalize (d);//D
137	u = normalize (u);//D
138
139	vec3 rz = -d;
140	vec3 rx = cross (u, rz);
141	vec3 ry = cross (rz, rx);
142
143	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
144	m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
145	m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
146	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
147
148	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
149	//printf ("diagfact = %f\n", diagfact);
150	diagfact = sqrtf (3.);//D WHY???
151
152	glMultMatrixf (m);
153
154	glGetFloatv (GL_MODELVIEW_MATRIX, m);
155
156	m = perspective * m;
157
158	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) );
159	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) );
160	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) );
161	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) );
162	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) );
163	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) );
164
165	{
166	GLdouble frustlen = z_far - z_near;
167	GLdouble fheight = frustlen * ftan;
168	GLdouble fwidth = fheight * w / h;
169	point half (0, 0, z_near + frustlen * .5);
170	point corner (fwidth, fheight, frustlen);
171
172	frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
173	}
174
175	{
176	GLdouble depth = h / ftan;
177
178	frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
179	}
180
181	glTranslatef (-p.x, -p.y, -p.z);
182	}
183
184	void view::begin ()
185	{
186	generation++;
187
188	vislist.clear ();
189
190	z_near = max (nz_near, 1.F);
191	z_far = max (nz_far, z_near * 2.F);
192	c_far = nc_far;
193
194	reset_projection ();
195
196	nz_near = 100.;
197	nc_far = nz_far = 1.F;
198	}
199
200	void view::end ()
201	{
202	vislist.clear ();
203	}
204
205	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
206
207	void view::render (enum pass_type p, pass &data)
208	{
209	pass_type = p;
210	pass_data = &data;
211
212	switch (pass_type)
213	{
214	case DEPTH:
215	glColorMask (1, 1, 1, 1);
216	glDepthMask (1);
217
218	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
219
220	//glEnable (GL_STENCIL_TEST); // for depth-passes
221	//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
222	//glStencilFunc (GL_LESS, 1, 255);
223
224	//glEnable (GL_POLYGON_OFFSET_FILL);
225	//glPolygonOffset (0, 5);
226	glDisable (GL_MINMAX);
227	glDepthRange (DEPTH_OFFSET, 1.);
228	glDepthFunc (GL_LESS);
229	glEnable (GL_DEPTH_TEST);
230	glColorMask (0, 0, 0, 0);
231	glDisable (GL_DEPTH_CLAMP_NV);
232
233	world.detect_visibility (*this);
234
235	break;
236
237	case POSTDEPTH:
238	glDepthRange (0., 1. - DEPTH_OFFSET);
239	glDepthFunc (GL_LESS);
240	glColorMask (0, 0, 0, 0);
241	glDepthMask (0);
242	glEnable (GL_DEPTH_CLAMP_NV);
243	glDisable (GL_STENCIL_TEST);
244
245	// check occlusion queries
246	for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
247	{
248	occ_query oq(*this, i->data, ::occ_query_result (i->id));
249	i->recv->event (oq);
250	}
251
252	occ_queries.clear ();
253
254	break;
255
256	case LIGHTED:
257	glClear (GL_STENCIL_BUFFER_BIT);
258	//glEnable (GL_STENCIL_TEST);
259	glEnable (GL_MINMAX);
260	glDepthRange (0., 1. - DEPTH_OFFSET);
261	glDepthFunc (GL_LESS);
262	glColorMask (1, 1, 1, 1);
263	glDepthMask (0);
264	glDisable (GL_DEPTH_CLAMP_NV);
265
266	break;
267	}
268
269	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
270	(i)->display (this);
271
272	if (pass_type == DEPTH)
273	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
274
275	drawn.clear ();
276
277	#if 0
278	if (pass == view::DEPTH)
279	{
280	glEnable (GL_DEPTH_CLAMP_NV);
281	glDepthMask (0);
282	glDepthFunc (GL_LESS);
283
284	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
285	{
286	begin_occ_query (**i);
287	(i)->draw_bbox (this);
288	end_occ_query ();
289	}
290
291	glDisable (GL_DEPTH_CLAMP_NV);
292	}
293	#endif
294	}
295
296	void light::enable ()
297	{
298	lightpos->set (p);
299	}
300
301	void light::disable ()
302	{
303	}
304
305	static shader::varying_1f camdist;
306	static shader::varying_3f lightvec;
307
308	void linear_light::vsh ()
309	{
310	using namespace shader::compile;
311
312	lightvec = xyz (lightpos - model_view_matrix * vin.vertex);
313	camdist = max (1 - length (lightvec) / radius, 0);
314
315	fsh ();
316	}
317
318	void linear_light::fsh ()
319	{
320	using namespace shader::compile;
321
322	sh_lightvec = lightvec;
323	sh_colour = float3 (c.r / 255.F, c.g / 255.F, c.b / 255.F) * (min (intensity * camdist * 0.6F + 0.9F, 1.F));
324	}
325
326