cvsroot/libgender/view.C

#include <cmath>

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

draw_context::draw_context (view &v)
: v(v), l(0), mode(LIGHTED)
{
}

draw_context::~draw_context ()
{
}

void draw_context::transform (const matrix &m)
{
  modelview = modelview * m;
  mvp = projection * modelview;
}

bool draw_context::may_draw (entity_base *e)
{
  if (drawn.find (e) != drawn.end ())
    return false;

  drawn.insert (e);
  return true;
}

void view::draw (draw_context &ctx)
{
  // check occlusion queries here

  ctx.generation++;

  renormalize (orig, p);

  if (ctx.mode == draw_context::DEPTH)
    {
      glEnable (GL_POLYGON_OFFSET_FILL);
      glPolygonOffset (0, 1);
      glDepthFunc (GL_LESS);
      glDisable (GL_LIGHTING);
      glColorMask (0, 0, 0, 0);
    }
  else
    {
      glDisable (GL_POLYGON_OFFSET_FILL);
      glDrawBuffer (GL_BACK);
      glDepthFunc (GL_LEQUAL);
      glEnable (GL_LIGHTING);
      glDepthMask (0);
    }
  
  glViewport (0, 0, w, h);

  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();

  GLdouble aspect = (GLdouble)w/h;
  GLdouble zNear = 0.1;
  GLdouble zFar = 50.;

  GLdouble ymax = zNear * tan (fov * (M_PI / 360.0));
  glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, zNear, zFar);

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

  matrix &m = ctx.projection;
  m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = -p.x;
  m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = -p.y;
  m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = -p.z;
  m(3,0) =    0; m(3,1) =    0; m(3,2) =    0; m(3,3) = 1;

  glMultMatrixf ((GLfloat *)m.data);

  glGetFloatv (GL_PROJECTION_MATRIX, (GLfloat *)&m);

  ctx.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) );
  ctx.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) );
  ctx.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) );
  ctx.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) );
  ctx.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) );
  ctx.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) );

  for (int i = 0; i < 4; i++)
    for (int j = 0; j < 4 ; j++)
      mvp[i][j] = m(i,j);

  ctx.modelview.identity ();

  world.draw (ctx);

  ctx.drawn.clear ();

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


Revision:	1.10
Committed:	Tue Oct 5 03:52:13 2004 UTC (22 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+6 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cmath>
2
3			#include "oct.h"
4			#include "view.h"
5
6	root	1.2	draw_context::draw_context (view &v)
7			: v(v), l(0), mode(LIGHTED)
8	root	1.1	{
9			}
10
11			draw_context::~draw_context ()
12			{
13			}
14
15	root	1.10	void draw_context::transform (const matrix &m)
16			{
17			modelview = modelview * m;
18			mvp = projection * modelview;
19			}
20
21	root	1.1	bool draw_context::may_draw (entity_base *e)
22			{
23			if (drawn.find (e) != drawn.end ())
24			return false;
25
26			drawn.insert (e);
27			return true;
28			}
29
30			void view::draw (draw_context &ctx)
31			{
32	root	1.4	// check occlusion queries here
33
34			ctx.generation++;
35
36	root	1.5	renormalize (orig, p);
37	root	1.3
38			if (ctx.mode == draw_context::DEPTH)
39			{
40			glEnable (GL_POLYGON_OFFSET_FILL);
41			glPolygonOffset (0, 1);
42			glDepthFunc (GL_LESS);
43			glDisable (GL_LIGHTING);
44	root	1.4	glColorMask (0, 0, 0, 0);
45	root	1.3	}
46			else
47			{
48			glDisable (GL_POLYGON_OFFSET_FILL);
49			glDrawBuffer (GL_BACK);
50			glDepthFunc (GL_LEQUAL);
51			glEnable (GL_LIGHTING);
52	root	1.4	glDepthMask (0);
53	root	1.3	}
54
55	root	1.1	glViewport (0, 0, w, h);
56
57			glMatrixMode (GL_PROJECTION);
58			glLoadIdentity ();
59
60			GLdouble aspect = (GLdouble)w/h;
61	root	1.6	GLdouble zNear = 0.1;
62			GLdouble zFar = 50.;
63	root	1.1
64			GLdouble ymax = zNear * tan (fov * (M_PI / 360.0));
65			glFrustum (-ymax * aspect, ymax * aspect, -ymax, ymax, zNear, zFar);
66
67	root	1.6	d = normalize (d);//D
68			u = normalize (u);//D
69	root	1.1	vec3 rz = -d;
70			vec3 rx = cross (u, rz);
71			vec3 ry = cross (rz, rx);
72
73	root	1.9	matrix &m = ctx.projection;
74	root	1.6	m(0,0) = rx.x; m(0,1) = rx.y; m(0,2) = rx.z; m(0,3) = -p.x;
75			m(1,0) = ry.x; m(1,1) = ry.y; m(1,2) = ry.z; m(1,3) = -p.y;
76			m(2,0) = rz.x; m(2,1) = rz.y; m(2,2) = rz.z; m(2,3) = -p.z;
77	root	1.3	m(3,0) = 0; m(3,1) = 0; m(3,2) = 0; m(3,3) = 1;
78
79			glMultMatrixf ((GLfloat *)m.data);
80	root	1.6
81	root	1.5	glGetFloatv (GL_PROJECTION_MATRIX, (GLfloat *)&m);
82
83	root	1.6	ctx.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) );
84			ctx.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) );
85			ctx.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) );
86			ctx.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) );
87			ctx.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) );
88			ctx.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) );
89	root	1.1
90	root	1.8	for (int i = 0; i < 4; i++)
91			for (int j = 0; j < 4 ; j++)
92			mvp[i][j] = m(i,j);
93
94	root	1.9	ctx.modelview.identity ();
95
96	root	1.1	world.draw (ctx);
97	root	1.4
98			ctx.drawn.clear ();
99
100			glColorMask (1, 1, 1, 0);
101			glDepthMask (1);
102	root	1.1	}
103	root	1.6
104	root	1.1