libgender/view.C

#include <cmath>

#include "opengl.h"

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

#include "entity.h"

using namespace gl;

skybox *world_skybox;

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);

  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) =  -1e30F / z_far; m(2,3) = 0;
    m(3,0) =          0; m(3,1) =          0; m(3,2) =            -1.F; 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;

  matrix view;
  {
    matrix &m = view;

    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.F;

    //diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
    diagfact = sqrtf (3.F);
  }

  //printf ("diagfact = %f\n", diagfact);
  //diagfact = sqrtf (3.);//D WHY???
  //
  view = view * matrix::translation (-p);

  matrix projection = perspective * view;

  {
    matrix &m = projection;

    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));

  glMatrixMode (GL_PROJECTION);
  glLoadMatrixf (projection);

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();
}

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

  stat1 = stat2 = 0; //D

  vislist.clear ();
  postdepthlist.clear ();

  z_near = max (nz_near, 1.F);
  z_far = max (nz_far, 1E10F);//D
  c_far = nc_far;

  reset_projection ();

  nz_near = 100.;
  nc_far = nz_far = 1.F;

  first_lighted = false;
}

void view::end ()
{
  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

  vislist.clear ();
}

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

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

  switch (pass.type)
    {
      case DEPTH:
        glEnable (GL_CULL_FACE);
        glDisable (GL_MINMAX);
        glDepthRange (DEPTH_OFFSET, 1.);
        glDepthFunc (GL_LESS);
        glColorMask (1, 1, 1, 1);
        glDisable (GL_BLEND);
        glDepthMask (1);

        glClear (GL_DEPTH_BUFFER_BIT | (world_skybox ? 0 : GL_COLOR_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_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);

        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);

        glEnable (GL_DEPTH_CLAMP_NV);
       
        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);

        glDisable (GL_DEPTH_CLAMP_NV);

        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);

        if (world_skybox)
          {
            glDisable (GL_DEPTH_TEST);
            world_skybox->draw (*this);//
            glEnable (GL_DEPTH_TEST);
          }

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

        first_lighted = false;

        break;
    }
  
  drawn.clear ();
}

void light::enable (view &ctx)
{
  lightpos->set (p + (orig - ctx.orig));
}

void light::disable (view &ctx)
{
}

void linear_light::enable (view &ctx)
{
  light::enable (ctx);
}

void linear_light::disable (view &ctx)
{
  light::disable (ctx);
}

void linear_light::vsh ()
{
  using namespace shader::compile;
  temp_1f camdist;

  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 (camdist * (intensity * 100.F) + 0.9F, 1.F));
}


Revision:	1.90
Committed:	Wed Aug 10 02:14:50 2005 UTC (18 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.89:	+2 -2 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	root	1.76	#include "material.h"
8	root	1.1
9	root	1.89	#include "entity.h"
10
11	root	1.55	using namespace gl;
12
13	root	1.89	skybox *world_skybox;
14
15	root	1.76	pass_data pass_depth (0, DEPTH);
16			pass_data pass_postdepth (0, POSTDEPTH);
17	root	1.68
18	root	1.37	vector<GLuint> occ_query_objects;
19
20			static GLuint begin_occ_query ()
21			{
22			GLuint id;
23
24			if (occ_query_objects.size ())
25			{
26			id = *(occ_query_objects.end () - 1);
27			occ_query_objects.pop_back ();
28			}
29			else
30	root	1.66	glGenQueries (1, &id);
31	root	1.37
32	root	1.66	glBeginQuery (GL_SAMPLES_PASSED, id);
33	root	1.37	return id;
34			}
35
36			inline void end_occ_query ()
37			{
38	root	1.66	glEndQuery (GL_SAMPLES_PASSED);
39	root	1.37	}
40
41			static GLuint occ_query_result (GLuint id)
42			{
43			GLuint count;
44
45	root	1.66	glGetQueryObjectuiv (id, GL_QUERY_RESULT, &count);
46	root	1.37	occ_query_objects.push_back (id);
47
48			return count;
49			}
50
51	root	1.17	view::view ()
52	root	1.60	: gamma(1.0), nz_near (1.F), nz_far (2.F)
53	root	1.1	{
54			}
55
56	root	1.17	view::~view ()
57	root	1.1	{
58			}
59
60	root	1.51	void view::begin_occ_query (recv_occ_query &recv, void *id)
61	root	1.37	{
62	root	1.51	occ_queries.push_back (oq_data (&recv, ::begin_occ_query (), id));
63	root	1.37	}
64
65			void view::end_occ_query ()
66			{
67			::end_occ_query ();
68			}
69
70	root	1.76	struct occ_query_material : material
71			{
72			void vsh (view &ctx);
73			void fsh (view &ctx);
74			};
75
76			static struct occ_query_material occ_query_material;
77
78			void occ_query_material::vsh (view &ctx)
79			{
80			std_vsh ();
81			}
82
83			void occ_query_material::fsh (view &ctx)
84			{
85			// nop
86			}
87
88	root	1.34	bool view::may_draw (const entity *e)
89	root	1.1	{
90			if (drawn.find (e) != drawn.end ())
91			return false;
92
93			drawn.insert (e);
94			return true;
95			}
96
97	root	1.51	visibility_base *visible::get_visibility (view &ctx)
98			{
99			view::visibility_map::iterator i = ctx.vismap.find (this);
100			visibility_base *vs;
101
102			if (i == ctx.vismap.end ())
103			{
104			vs = new_visibility ();
105			ctx.vismap.insert (view::visibility_map::value_type (this, vs));
106			}
107			else
108			{
109			vs = i->second;
110
111			if (vs->generation != ctx.generation)
112			{
113	root	1.80	if (ctx.generation - vs->generation > 2)
114	root	1.51	clear_visibility (vs);
115
116			vs->generation = ctx.generation;
117			}
118			}
119
120			return vs;
121			}
122
123	root	1.18	void view::reset_projection ()
124	root	1.1	{
125	root	1.42	renormalize (orig, p);
126	root	1.3
127	root	1.1	glViewport (0, 0, w, h);
128
129			GLdouble aspect = (GLdouble)w/h;
130	root	1.77	GLdouble ftan = tanf (fov * GLfloat (.5 * M_PI / 180.));
131			GLdouble ymax = ftan;
132	root	1.59	GLdouble xmax = ymax * aspect;
133	root	1.1
134	root	1.72	matrix perspective;
135			{
136			matrix &m = perspective;
137
138	root	1.75	m(0,0) = 1.F / xmax; m(0,1) = 0; m(0,2) = 0; m(0,3) = 0;
139			m(1,0) = 0; m(1,1) = 1.F / ymax; m(1,2) = 0; m(1,3) = 0;
140	root	1.84	m(2,0) = 0; m(2,1) = 0; m(2,2) = -1e30F / z_far; m(2,3) = 0;
141	root	1.81	m(3,0) = 0; m(3,1) = 0; m(3,2) = -1.F; m(3,3) = 0;
142	root	1.74
143			glLoadMatrixf (perspective);
144	root	1.72	}
145	root	1.77	//glFrustum (-xmax, xmax, -ymax, ymax, z_near, z_far);
146	root	1.72
147	root	1.85	//glGetFloatv (GL_PROJECTION_MATRIX, perspective);
148	root	1.1
149	root	1.59	perspfact = z_near / ymax * 0.5F * h;
150	root	1.48
151	root	1.85	matrix view;
152			{
153			matrix &m = view;
154
155			d = normalize (d);//D
156			u = normalize (u);//D
157	root	1.72
158	root	1.85	vec3 rz = -d;
159			vec3 rx = cross (u, rz);
160			vec3 ry = cross (rz, rx);
161
162			m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = 0;
163			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = 0;
164			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = 0;
165			m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1.F;
166	root	1.41
167	root	1.85	//diagfact = abs (rz.x) + abs (rz.y) + abs (rz.z);
168			diagfact = sqrtf (3.F);
169			}
170	root	1.37
171	root	1.48	//printf ("diagfact = %f\n", diagfact);
172	root	1.81	//diagfact = sqrtf (3.);//D WHY???
173	root	1.85	//
174			view = view * matrix::translation (-p);
175	root	1.3
176	root	1.85	matrix projection = perspective * view;
177	root	1.81
178	root	1.85	{
179			matrix &m = projection;
180	root	1.72
181	root	1.85	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) );
182			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) );
183			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) );
184			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) );
185			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) );
186			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) );
187			}
188	root	1.1
189	root	1.77	#if 0
190	root	1.59	{
191			GLdouble frustlen = z_far - z_near;
192			GLdouble fheight = frustlen * ftan;
193			GLdouble fwidth = fheight * w / h;
194			point half (0, 0, z_near + frustlen * .5);
195			point corner (fwidth, fheight, frustlen);
196
197			frustum.s = sphere (p + d * (.5 * frustlen), length (corner - half));
198			}
199	root	1.77	#endif
200	root	1.59
201	root	1.85	GLdouble depth = h / ftan;
202			frustum.c = cone (p, d, atan (sqrt (GLdouble (w * w + h * h)) * ftan));
203
204			glMatrixMode (GL_PROJECTION);
205			glLoadMatrixf (projection);
206	root	1.59
207	root	1.85	glMatrixMode (GL_MODELVIEW);
208			glLoadIdentity ();
209	root	1.18	}
210
211			void view::begin ()
212			{
213	root	1.53	generation++;
214
215	root	1.88	stat1 = stat2 = 0; //D
216
217	root	1.19	vislist.clear ();
218	root	1.80	postdepthlist.clear ();
219	root	1.18
220	root	1.60	z_near = max (nz_near, 1.F);
221	root	1.83	z_far = max (nz_far, 1E10F);//D
222	root	1.43	c_far = nc_far;
223	root	1.48
224	root	1.43	reset_projection ();
225
226	root	1.65	nz_near = 100.;
227	root	1.60	nc_far = nz_far = 1.F;
228	root	1.77
229			first_lighted = false;
230	root	1.18	}
231
232			void view::end ()
233			{
234	root	1.88	printf ("fps %f NF %f:%f vis %d,%d (%d,%d) CAM (%ld,%ld,%ld)\n",
235			timer.fps, z_near, z_far, vislist.size (), drawn.size (), stat1, stat2, orig.x, orig.y, orig.z);//D
236
237	root	1.40	vislist.clear ();
238	root	1.18	}
239
240	root	1.50	#define DEPTH_OFFSET (1. / (GLdouble)(1L << 16))
241
242	root	1.76	void view::render (pass_data &pass)
243	root	1.18	{
244	root	1.76	this->pass = &pass;
245	root	1.18
246	root	1.76	switch (pass.type)
247	root	1.18	{
248	root	1.52	case DEPTH:
249	root	1.89	glEnable (GL_CULL_FACE);
250			glDisable (GL_MINMAX);
251			glDepthRange (DEPTH_OFFSET, 1.);
252			glDepthFunc (GL_LESS);
253	root	1.63	glColorMask (1, 1, 1, 1);
254	root	1.89	glDisable (GL_BLEND);
255	root	1.63	glDepthMask (1);
256
257	root	1.89	glClear (GL_DEPTH_BUFFER_BIT \| (world_skybox ? 0 : GL_COLOR_BUFFER_BIT));
258	root	1.63
259			//glEnable (GL_STENCIL_TEST); // for depth-passes
260			//glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
261			//glStencilFunc (GL_LESS, 1, 255);
262
263	root	1.52	//glEnable (GL_POLYGON_OFFSET_FILL);
264			//glPolygonOffset (0, 5);
265			glEnable (GL_DEPTH_TEST);
266			glColorMask (0, 0, 0, 0);
267	root	1.54
268	root	1.61	world.detect_visibility (*this);
269	root	1.54
270	root	1.77	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
271			(i)->draw_depth (this);
272
273	root	1.52	break;
274
275			case POSTDEPTH:
276	root	1.59	glDepthRange (0., 1. - DEPTH_OFFSET);
277	root	1.57	glDepthFunc (GL_LESS);
278	root	1.52	glColorMask (0, 0, 0, 0);
279			glDepthMask (0);
280	root	1.63	glDisable (GL_STENCIL_TEST);
281	root	1.75	glDisable (GL_CULL_FACE);
282	root	1.81
283			glEnable (GL_DEPTH_CLAMP_NV);
284	root	1.53
285	root	1.76	occ_query_material.enable (*this);
286
287	root	1.53	// check occlusion queries
288			for (vector<oq_data>::iterator i = occ_queries.begin (); i != occ_queries.end (); ++i)
289			{
290	root	1.90	//occ_query oq(*this, i->data, ::occ_query_result (i->id));
291			//i->recv->event (oq);
292	root	1.53	}
293
294	root	1.76	occ_query_material.disable (*this);
295
296	root	1.53	occ_queries.clear ();
297
298	root	1.80	for (vector<octant *>::iterator i = postdepthlist.begin (); i != postdepthlist.end (); ++i)
299	root	1.77	(i)->draw_postdepth (this);
300	root	1.81
301			glDisable (GL_DEPTH_CLAMP_NV);
302	root	1.77
303			first_lighted = true;
304
305	root	1.52	break;
306
307			case LIGHTED:
308	root	1.77	if (first_lighted)
309			glDisable (GL_BLEND);
310			else
311			{
312			glBlendFunc (GL_ONE, GL_ONE);
313			glEnable (GL_BLEND);
314			}
315
316	root	1.75	//glClear (GL_STENCIL_BUFFER_BIT);
317	root	1.63	//glEnable (GL_STENCIL_TEST);
318	root	1.77	glEnable (GL_CULL_FACE);
319	root	1.52	glEnable (GL_MINMAX);
320			glDepthRange (0., 1. - DEPTH_OFFSET);
321			glDepthFunc (GL_LESS);
322	root	1.53	glColorMask (1, 1, 1, 1);
323	root	1.52	glDepthMask (0);
324	root	1.54
325	root	1.89	if (world_skybox)
326			{
327			glDisable (GL_DEPTH_TEST);
328			world_skybox->draw (*this);//
329			glEnable (GL_DEPTH_TEST);
330			}
331
332	root	1.77	for (vector<octant *>::iterator i = vislist.begin (); i != vislist.end (); ++i)
333			(i)->draw_lighted (this);
334
335			first_lighted = false;
336
337	root	1.52	break;
338	root	1.18	}
339
340	root	1.56	drawn.clear ();
341	root	1.1	}
342	root	1.6
343	root	1.85	void light::enable (view &ctx)
344	root	1.69	{
345	root	1.86	lightpos->set (p + (orig - ctx.orig));
346	root	1.69	}
347
348	root	1.85	void light::disable (view &ctx)
349	root	1.69	{
350			}
351
352	root	1.87	void linear_light::enable (view &ctx)
353			{
354			light::enable (ctx);
355			}
356
357			void linear_light::disable (view &ctx)
358			{
359			light::disable (ctx);
360			}
361
362	root	1.69	void linear_light::vsh ()
363			{
364			using namespace shader::compile;
365	root	1.85	temp_1f camdist;
366	root	1.69
367			lightvec = xyz (lightpos - model_view_matrix * vin.vertex);
368			camdist = max (1 - length (lightvec) / radius, 0);
369	root	1.73
370			fsh ();
371	root	1.69	}
372
373	root	1.73	void linear_light::fsh ()
374	root	1.69	{
375			using namespace shader::compile;
376
377	root	1.73	sh_lightvec = lightvec;
378	root	1.87	sh_colour = float3 (c.r / 255.F, c.g / 255.F, c.b / 255.F) * (min (camdist * (intensity * 100.F) + 0.9F, 1.F));
379	root	1.69	}
380
381	root	1.1