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 1
  {
    matrix &m = perspective;

    m(0,0) = 1.F / xmax; m(0,1) =          0; m(0,2) =               0; m(0,3) = 0;
    m(1,0) =          0; m(1,1) = 1.F / ymax; m(1,2) =               0; m(1,3) = 0;
    m(2,0) =          0; m(2,1) =          0; m(2,2) =  -1e10F / z_far; m(2,3) = 1;
    m(3,0) =          0; m(3,1) =          0; m(3,2) =              -1; m(3,3) = 0;

    glLoadMatrixf (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);
        glDisable (GL_BLEND);

        //glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_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);
        glEnable (GL_CULL_FACE);
        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);
        glDisable (GL_CULL_FACE);
       
        // 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:
        glEnable (GL_CULL_FACE);
        //glEnable (GL_BLEND);//TODO, only when not first lighted pass
        glBlendFunc (GL_ONE, GL_ONE);
        //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 * 100.F + 0.9F, 1.F));
}


Revision:	1.75
Committed:	Sun Nov 7 02:28:18 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.74:	+14 -7 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	1.68	pass pass_depth (0);
11
12	root	1.37	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	root	1.66	glGenQueries (1, &id);
25	root	1.37
26	root	1.66	glBeginQuery (GL_SAMPLES_PASSED, id);
27	root	1.37	return id;
28			}
29
30			inline void end_occ_query ()
31			{
32	root	1.66	glEndQuery (GL_SAMPLES_PASSED);
33	root	1.37	}
34
35			static GLuint occ_query_result (GLuint id)
36			{
37			GLuint count;
38
39	root	1.66	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
40	root	1.37	occ_query_objects.push_back (id);
41
42			return count;
43			}
44
45	root	1.17	view::view ()
46	root	1.60	: gamma(1.0), nz_near (1.F), nz_far (2.F)
47	root	1.1	{
48			}
49
50	root	1.17	view::~view ()
51	root	1.1	{
52			}
53
54	root	1.51	void view::begin_occ_query (recv_occ_query &recv, void *id)
55	root	1.37	{
56	root	1.51	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
57	root	1.37	}
58
59			void view::end_occ_query ()
60			{
61			::end_occ_query ();
62			}
63
64	root	1.34	bool view::may_draw (const entity *e)
65	root	1.1	{
66			if (drawn.find (e) != drawn.end ())
67			return false;
68
69			drawn.insert (e);
70			return true;
71			}
72
73	root	1.51	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	root	1.18	void view::reset_projection ()
100	root	1.1	{
101	root	1.42	renormalize (orig, p);
102	root	1.3
103	root	1.1	glViewport (0, 0, w, h);
104
105			glMatrixMode (GL_PROJECTION);
106			glLoadIdentity ();
107
108			GLdouble aspect = (GLdouble)w/h;
109	root	1.59	GLdouble ftan = tan (fov * (.5 * M_PI / 180.));
110			GLdouble ymax = z_near * ftan;
111			GLdouble xmax = ymax * aspect;
112	root	1.1
113	root	1.72	matrix perspective;
114	root	1.74	#if 1
115	root	1.72	{
116			matrix &m = perspective;
117
118	root	1.75	m(0,0) = 1.F / xmax; m(0,1) = 0; m(0,2) = 0; m(0,3) = 0;
119			m(1,0) = 0; m(1,1) = 1.F / ymax; m(1,2) = 0; m(1,3) = 0;
120			m(2,0) = 0; m(2,1) = 0; m(2,2) = -1e10F / z_far; m(2,3) = 1;
121			m(3,0) = 0; m(3,1) = 0; m(3,2) = -1; m(3,3) = 0;
122	root	1.74
123			glLoadMatrixf (perspective);
124	root	1.72	}
125			#else
126	root	1.59	glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
127	root	1.72	#endif
128
129			glGetFloatv (GL_PROJECTION_MATRIX, perspective);
130	root	1.1
131	root	1.59	perspfact = z_near / ymax * 0.5F * h;
132	root	1.48
133	root	1.72	glMatrixMode (GL_MODELVIEW);
134			glLoadIdentity ();
135			matrix &m = projection;
136
137	root	1.6	d = normalize (d);//D
138			u = normalize (u);//D
139	root	1.41
140	root	1.1	vec3 rz = -d;
141			vec3 rx = cross (u, rz);
142			vec3 ry = cross (rz, rx);
143
144	root	1.16	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
145			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
146			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
147	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
148	root	1.37
149	root	1.38	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
150	root	1.48	//printf ("diagfact = %f\n", diagfact);
151	root	1.41	diagfact = sqrtf (3.);//D WHY???
152	root	1.3
153	root	1.38	glMultMatrixf (m);
154	root	1.63
155	root	1.72	glGetFloatv (GL_MODELVIEW_MATRIX, m);
156
157			m = perspective * m;
158	root	1.5
159	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) );
160			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) );
161			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) );
162			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) );
163			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) );
164			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) );
165	root	1.1
166	root	1.59	{
167			GLdouble frustlen = z_far - z_near;
168			GLdouble fheight = frustlen * ftan;
169			GLdouble fwidth = fheight * w / h;
170			point half (0, 0, z_near + frustlen * .5);
171			point corner (fwidth, fheight, frustlen);
172
173			frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
174			}
175
176			{
177			GLdouble depth = h / ftan;
178
179			frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
180			}
181
182	root	1.67	glTranslatef (-p.x, -p.y, -p.z);
183	root	1.18	}
184
185			void view::begin ()
186			{
187	root	1.53	generation++;
188
189	root	1.19	vislist.clear ();
190	root	1.18
191	root	1.60	z_near = max (nz_near, 1.F);
192			z_far = max (nz_far, z_near * 2.F);
193	root	1.43	c_far = nc_far;
194	root	1.48
195	root	1.43	reset_projection ();
196
197	root	1.65	nz_near = 100.;
198	root	1.60	nc_far = nz_far = 1.F;
199	root	1.18	}
200
201			void view::end ()
202			{
203	root	1.40	vislist.clear ();
204	root	1.18	}
205
206	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
207
208	root	1.68	void view::render (enum pass_type p, pass &data)
209	root	1.18	{
210	root	1.68	pass_type = p;
211			pass_data = &data;
212	root	1.18
213	root	1.68	switch (pass_type)
214	root	1.18	{
215	root	1.52	case DEPTH:
216	root	1.63	glColorMask (1, 1, 1, 1);
217			glDepthMask (1);
218	root	1.75	glDisable (GL_BLEND);
219	root	1.63
220	root	1.75	//glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
221			glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
222	root	1.63
223			//glEnable (GL_STENCIL_TEST); // for depth-passes
224			//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
225			//glStencilFunc (GL_LESS, 1, 255);
226
227	root	1.52	//glEnable (GL_POLYGON_OFFSET_FILL);
228			//glPolygonOffset (0, 5);
229	root	1.75	glEnable (GL_CULL_FACE);
230	root	1.52	glDisable (GL_MINMAX);
231			glDepthRange (DEPTH_OFFSET, 1.);
232			glDepthFunc (GL_LESS);
233			glEnable (GL_DEPTH_TEST);
234			glColorMask (0, 0, 0, 0);
235	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
236	root	1.54
237	root	1.61	world.detect_visibility (*this);
238	root	1.54
239	root	1.52	break;
240
241			case POSTDEPTH:
242	root	1.59	glDepthRange (0., 1. - DEPTH_OFFSET);
243	root	1.57	glDepthFunc (GL_LESS);
244	root	1.52	glColorMask (0, 0, 0, 0);
245			glDepthMask (0);
246	root	1.59	glEnable (GL_DEPTH_CLAMP_NV);
247	root	1.63	glDisable (GL_STENCIL_TEST);
248	root	1.75	glDisable (GL_CULL_FACE);
249	root	1.53
250			// check occlusion queries
251			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
252			{
253			occ_query oq(*this, i->data, ::occ_query_result (i->id));
254			i->recv->event (oq);
255			}
256
257			occ_queries.clear ();
258
259	root	1.52	break;
260
261			case LIGHTED:
262	root	1.75	glEnable (GL_CULL_FACE);
263			//glEnable (GL_BLEND);//TODO, only when not first lighted pass
264			glBlendFunc (GL_ONE, GL_ONE);
265			//glClear (GL_STENCIL_BUFFER_BIT);
266	root	1.63	//glEnable (GL_STENCIL_TEST);
267	root	1.52	glEnable (GL_MINMAX);
268			glDepthRange (0., 1. - DEPTH_OFFSET);
269			glDepthFunc (GL_LESS);
270	root	1.53	glColorMask (1, 1, 1, 1);
271	root	1.52	glDepthMask (0);
272	root	1.59	glDisable (GL_DEPTH_CLAMP_NV);
273	root	1.54
274	root	1.52	break;
275	root	1.18	}
276
277	root	1.61	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
278			(i)->display (this);
279	root	1.62
280	root	1.68	if (pass_type == DEPTH)
281	root	1.62	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
282	root	1.61
283	root	1.56	drawn.clear ();
284
285	root	1.52	#if 0
286	root	1.56	if (pass == view::DEPTH)
287	root	1.25	{
288	root	1.27	glEnable (GL_DEPTH_CLAMP_NV);
289	root	1.42	glDepthMask (0);
290	root	1.30	glDepthFunc (GL_LESS);
291	root	1.25
292	root	1.37	for (vector<octant *>::iterator i = farlist.begin (); i != farlist.end (); ++i)
293			{
294	root	1.48	begin_occ_query (**i);
295	root	1.37	(i)->draw_bbox (this);
296	root	1.48	end_occ_query ();
297	root	1.30	}
298	root	1.27
299			glDisable (GL_DEPTH_CLAMP_NV);
300	root	1.25	}
301	root	1.52	#endif
302	root	1.1	}
303	root	1.6
304	root	1.69	void light::enable ()
305			{
306			lightpos->set (p);
307			}
308
309			void light::disable ()
310			{
311			}
312
313			static shader::varying_1f camdist;
314			static shader::varying_3f lightvec;
315
316			void linear_light::vsh ()
317			{
318			using namespace shader::compile;
319
320			lightvec = xyz (lightpos - model_view_matrix * vin.vertex);
321			camdist = max (1 - length (lightvec) / radius, 0);
322	root	1.73
323			fsh ();
324	root	1.69	}
325
326	root	1.73	void linear_light::fsh ()
327	root	1.69	{
328			using namespace shader::compile;
329
330	root	1.73	sh_lightvec = lightvec;
331	root	1.75	sh_colour = float3 (c.r / 255.F, c.g / 255.F, c.b / 255.F) * (min (intensity * camdist * 100.F + 0.9F, 1.F));
332	root	1.69	}
333
334	root	1.1