libgender/view.C

#include <cmath>

#include "opengl.h"

#include "view.h"
#include "oct.h"
#include "material.h"

using namespace gl;

pass_data pass_depth     (0, DEPTH);
pass_data pass_postdepth (0, POSTDEPTH);

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 ();
}

struct occ_query_material : material
{
  void vsh (view &ctx);
  void fsh (view &ctx);
};

static struct occ_query_material occ_query_material;

void occ_query_material::vsh (view &ctx)
{
  std_vsh ();
}

void occ_query_material::fsh (view &ctx)
{
  // nop
}

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 (ctx.generation - vs->generation > 2)
            clear_visibility (vs);

          vs->generation = ctx.generation;
        }
    }

  return vs;
}

void view::reset_projection ()
{
  renormalize (orig, p);

  glViewport (0, 0, w, h);

  glMatrixMode (GL_PROJECTION);

  GLdouble aspect = (GLdouble)w/h;
  GLdouble ftan = tanf (fov * GLfloat (.5 * M_PI / 180.));
  GLdouble ymax = ftan;
  GLdouble xmax = ymax * aspect;

  matrix perspective;
  {
    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);
  }
  //glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);

  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);
  
  glTranslatef (-p.x, -p.y, -p.z);

  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) );

#if 0
  {
    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));
  }
#endif

  {
    GLdouble depth = h / ftan;

    frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
  }
}

void view::begin ()
{
  generation++;

  vislist.clear ();
  postdepthlist.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;

  first_lighted = false;
}

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

#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))

void view::render (pass_data &pass)
{
  this->pass = &pass;

  stat1 = stat2 = 0; //D

  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);

        world.detect_visibility (*this);

        for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
          (*i)->draw_depth (*this);

        if (pass.type == DEPTH)
          printf ("fps %f NF %f:%f vis %d,%d (%d,%d) CAM (%ld,%ld,%ld)\n",
                  timer.fps, z_near, z_far, vislist.size (), drawn.size (), stat1, stat2, orig.x, orig.y, orig.z);//D

        break;

      case POSTDEPTH:
        glDepthRange (0., 1. - DEPTH_OFFSET);
        glDepthFunc (GL_LESS);
        glColorMask (0, 0, 0, 0);
        glDepthMask (0);
        glDisable (GL_STENCIL_TEST);
        glDisable (GL_CULL_FACE);
       
        occ_query_material.enable (*this);

        // 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_query_material.disable (*this);

        occ_queries.clear ();

        for (vector<octant *>::iterator i = postdepthlist.begin (); i != postdepthlist.end (); ++i)
          (*i)->draw_postdepth (*this);

        first_lighted = true;

        break;

      case LIGHTED:
        if (first_lighted)
          glDisable (GL_BLEND);
        else
          {
            glBlendFunc (GL_ONE, GL_ONE);
            glEnable (GL_BLEND);
          }

        //glClear (GL_STENCIL_BUFFER_BIT);
        //glEnable (GL_STENCIL_TEST);
        glEnable (GL_CULL_FACE);
        glEnable (GL_MINMAX);
        glDepthRange (0., 1. - DEPTH_OFFSET);
        glDepthFunc (GL_LESS);
        glColorMask (1, 1, 1, 1);
        glDepthMask (0);

        for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
          (*i)->draw_lighted (*this);

        first_lighted = false;

        break;
    }
  
  drawn.clear ();
}

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:	1.80
Committed:	Fri Nov 26 02:38:17 2004 UTC (19 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.79:	+3 -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	#include "material.h"
8
9	using namespace gl;
10
11	pass_data pass_depth (0, DEPTH);
12	pass_data pass_postdepth (0, POSTDEPTH);
13
14	vector<GLuint> occ_query_objects;
15
16	static GLuint begin_occ_query ()
17	{
18	GLuint id;
19
20	if (occ_query_objects.size ())
21	{
22	id = *(occ_query_objects.end () - 1);
23	occ_query_objects.pop_back ();
24	}
25	else
26	glGenQueries (1, &id);
27
28	glBeginQuery (GL_SAMPLES_PASSED, id);
29	return id;
30	}
31
32	inline void end_occ_query ()
33	{
34	glEndQuery (GL_SAMPLES_PASSED);
35	}
36
37	static GLuint occ_query_result (GLuint id)
38	{
39	GLuint count;
40
41	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
42	occ_query_objects.push_back (id);
43
44	return count;
45	}
46
47	view::view ()
48	: gamma(1.0), nz_near (1.F), nz_far (2.F)
49	{
50	}
51
52	view::~view ()
53	{
54	}
55
56	void view::begin_occ_query (recv_occ_query &recv, void *id)
57	{
58	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
59	}
60
61	void view::end_occ_query ()
62	{
63	::end_occ_query ();
64	}
65
66	struct occ_query_material : material
67	{
68	void vsh (view &ctx);
69	void fsh (view &ctx);
70	};
71
72	static struct occ_query_material occ_query_material;
73
74	void occ_query_material::vsh (view &ctx)
75	{
76	std_vsh ();
77	}
78
79	void occ_query_material::fsh (view &ctx)
80	{
81	// nop
82	}
83
84	bool view::may_draw (const entity *e)
85	{
86	if (drawn.find (e) != drawn.end ())
87	return false;
88
89	drawn.insert (e);
90	return true;
91	}
92
93	visibility_base *visible::get_visibility (view &ctx)
94	{
95	view::visibility_map::iterator i = ctx.vismap.find (this);
96	visibility_base *vs;
97
98	if (i == ctx.vismap.end ())
99	{
100	vs = new_visibility ();
101	ctx.vismap.insert (view::visibility_map::value_type (this, vs));
102	}
103	else
104	{
105	vs = i->second;
106
107	if (vs->generation != ctx.generation)
108	{
109	if (ctx.generation - vs->generation > 2)
110	clear_visibility (vs);
111
112	vs->generation = ctx.generation;
113	}
114	}
115
116	return vs;
117	}
118
119	void view::reset_projection ()
120	{
121	renormalize (orig, p);
122
123	glViewport (0, 0, w, h);
124
125	glMatrixMode (GL_PROJECTION);
126
127	GLdouble aspect = (GLdouble)w/h;
128	GLdouble ftan = tanf (fov * GLfloat (.5 * M_PI / 180.));
129	GLdouble ymax = ftan;
130	GLdouble xmax = ymax * aspect;
131
132	matrix perspective;
133	{
134	matrix &m = perspective;
135
136	m(0,0) = 1.F / xmax; m(0,1) = 0; m(0,2) = 0; m(0,3) = 0;
137	m(1,0) = 0; m(1,1) = 1.F / ymax; m(1,2) = 0; m(1,3) = 0;
138	m(2,0) = 0; m(2,1) = 0; m(2,2) = -1e10F / z_far; m(2,3) = 1;
139	m(3,0) = 0; m(3,1) = 0; m(3,2) = -1; m(3,3) = 0;
140
141	glLoadMatrixf (perspective);
142	}
143	//glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
144
145	glGetFloatv (GL_PROJECTION_MATRIX, perspective);
146
147	perspfact = z_near / ymax * 0.5F * h;
148
149	glMatrixMode (GL_MODELVIEW);
150	glLoadIdentity ();
151	matrix &m = projection;
152
153	d = normalize (d);//D
154	u = normalize (u);//D
155
156	vec3 rz = -d;
157	vec3 rx = cross (u, rz);
158	vec3 ry = cross (rz, rx);
159
160	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
161	m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
162	m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
163	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
164
165	diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
166	//printf ("diagfact = %f\n", diagfact);
167	diagfact = sqrtf (3.);//D WHY???
168
169	glMultMatrixf (m);
170
171	glTranslatef (-p.x, -p.y, -p.z);
172
173	glGetFloatv (GL_MODELVIEW_MATRIX, m);
174
175	m = perspective * m;
176
177	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) );
178	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) );
179	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) );
180	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) );
181	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) );
182	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) );
183
184	#if 0
185	{
186	GLdouble frustlen = z_far - z_near;
187	GLdouble fheight = frustlen * ftan;
188	GLdouble fwidth = fheight * w / h;
189	point half (0, 0, z_near + frustlen * .5);
190	point corner (fwidth, fheight, frustlen);
191
192	frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
193	}
194	#endif
195
196	{
197	GLdouble depth = h / ftan;
198
199	frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan / h));
200	}
201	}
202
203	void view::begin ()
204	{
205	generation++;
206
207	vislist.clear ();
208	postdepthlist.clear ();
209
210	z_near = max (nz_near, 1.F);
211	z_far = max (nz_far, z_near * 2.F);
212	c_far = nc_far;
213
214	reset_projection ();
215
216	nz_near = 100.;
217	nc_far = nz_far = 1.F;
218
219	first_lighted = false;
220	}
221
222	void view::end ()
223	{
224	vislist.clear ();
225	}
226
227	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
228
229	void view::render (pass_data &pass)
230	{
231	this->pass = &pass;
232
233	stat1 = stat2 = 0; //D
234
235	switch (pass.type)
236	{
237	case DEPTH:
238	glColorMask (1, 1, 1, 1);
239	glDepthMask (1);
240	glDisable (GL_BLEND);
241
242	//glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
243	glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
244
245	//glEnable (GL_STENCIL_TEST); // for depth-passes
246	//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
247	//glStencilFunc (GL_LESS, 1, 255);
248
249	//glEnable (GL_POLYGON_OFFSET_FILL);
250	//glPolygonOffset (0, 5);
251	glEnable (GL_CULL_FACE);
252	glDisable (GL_MINMAX);
253	glDepthRange (DEPTH_OFFSET, 1.);
254	glDepthFunc (GL_LESS);
255	glEnable (GL_DEPTH_TEST);
256	glColorMask (0, 0, 0, 0);
257
258	world.detect_visibility (*this);
259
260	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
261	(i)->draw_depth (this);
262
263	if (pass.type == DEPTH)
264	printf ("fps %f NF %f:%f vis %d,%d (%d,%d) CAM (%ld,%ld,%ld)\n",
265	timer.fps, z_near, z_far, vislist.size (), drawn.size (), stat1, stat2, orig.x, orig.y, orig.z);//D
266
267	break;
268
269	case POSTDEPTH:
270	glDepthRange (0., 1. - DEPTH_OFFSET);
271	glDepthFunc (GL_LESS);
272	glColorMask (0, 0, 0, 0);
273	glDepthMask (0);
274	glDisable (GL_STENCIL_TEST);
275	glDisable (GL_CULL_FACE);
276
277	occ_query_material.enable (*this);
278
279	// check occlusion queries
280	for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
281	{
282	occ_query oq(*this, i->data, ::occ_query_result (i->id));
283	i->recv->event (oq);
284	}
285
286	occ_query_material.disable (*this);
287
288	occ_queries.clear ();
289
290	for (vector<octant *>::iterator i = postdepthlist.begin (); i != postdepthlist.end (); ++i)
291	(i)->draw_postdepth (this);
292
293	first_lighted = true;
294
295	break;
296
297	case LIGHTED:
298	if (first_lighted)
299	glDisable (GL_BLEND);
300	else
301	{
302	glBlendFunc (GL_ONE, GL_ONE);
303	glEnable (GL_BLEND);
304	}
305
306	//glClear (GL_STENCIL_BUFFER_BIT);
307	//glEnable (GL_STENCIL_TEST);
308	glEnable (GL_CULL_FACE);
309	glEnable (GL_MINMAX);
310	glDepthRange (0., 1. - DEPTH_OFFSET);
311	glDepthFunc (GL_LESS);
312	glColorMask (1, 1, 1, 1);
313	glDepthMask (0);
314
315	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
316	(i)->draw_lighted (this);
317
318	first_lighted = false;
319
320	break;
321	}
322
323	drawn.clear ();
324	}
325
326	void light::enable ()
327	{
328	lightpos->set (p);
329	}
330
331	void light::disable ()
332	{
333	}
334
335	static shader::varying_1f camdist;
336	static shader::varying_3f lightvec;
337
338	void linear_light::vsh ()
339	{
340	using namespace shader::compile;
341
342	lightvec = xyz (lightpos - model_view_matrix * vin.vertex);
343	camdist = max (1 - length (lightvec) / radius, 0);
344
345	fsh ();
346	}
347
348	void linear_light::fsh ()
349	{
350	using namespace shader::compile;
351
352	sh_lightvec = lightvec;
353	sh_colour = float3 (c.r / 255.F, c.g / 255.F, c.b / 255.F) * (min (intensity * camdist * 100.F + 0.9F, 1.F));
354	}
355
356