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Frist pass at view frustum culling now operational.

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This commit is contained in:
curt 1998-05-17 16:59:34 +00:00
parent fdc94bd13a
commit e57fd21bd3
1 changed files with 75 additions and 16 deletions
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89
Scenery/tilemgr.cxx
View file

@ -202,6 +202,7 @@ static int viewable( fgCartesianPoint3d *cp, double radius ) {
fgVIEW *v;
MAT3hvec world, eye;
int viewable = 1; // start by assuming it's viewable
double x0, x1, y1, slope;
v = &current_view;
@ -210,15 +211,68 @@ static int viewable( fgCartesianPoint3d *cp, double radius ) {
// printf( "\nworld -> eye = %.2f %.2f %.2f radius = %.2f\n",
// eye[0], eye[1], eye[2], radius);
// Check near clip plane
if ( eye[2] - radius > 0.0 ) {
// Check near clip plane
viewable = 0;
} else if ( eye[1] < -(v->slope_x) * (eye[0] + radius) ) {
// Check left edge
// y = m * (x - x0) = equation of a line intercepting X axis at x0
printf( "eye[1] = %.2f slope_x = %.2f radius = %.2f\n",
eye[1], v->slope_x, radius);
viewable = 0;
return(0);
}
// check right clip plane (from eye perspective)
// y = m * (x - x0) = equation of a line intercepting X axis at x0
x1 = v->cos_fov_x * radius;
y1 = v->sin_fov_x * radius;
slope = -1.0 / v->slope_x;
x0 = x1 - y1 / slope;
// printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
// printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
// printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
// x0, slope, radius);
if ( eye[2] > slope * (eye[0] - x0) ) {
return(0);
}
// check left clip plane (from eye perspective)
x1 = -x1;
slope = -slope;
x0 = x1 - y1 / slope;
// printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
// printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
// printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
// x0, slope, radius);
if ( eye[2] > slope * (eye[0] - x0) ) {
return(0);
}
// check bottom clip plane (from eye perspective)
x1 = -(v->cos_fov_y) * radius;
y1 = v->sin_fov_y * radius;
slope = 1.0 / v->slope_y;
x0 = x1 - y1 / slope;
// printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
// printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
// printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
// x0, slope, radius);
if ( eye[2] > slope * (eye[1] - x0) ) {
return(0);
}
// check top clip plane (from eye perspective)
x1 = -x1;
slope = -slope;
x0 = x1 - y1 / slope;
// printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
// printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
// printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
// x0, slope, radius);
if ( eye[2] > slope * (eye[1] - x0) ) {
return(0);
}
return(viewable);
@ -229,6 +283,7 @@ static int viewable( fgCartesianPoint3d *cp, double radius ) {
void fgTileMgrRender( void ) {
fgFLIGHT *f;
fgOPTIONS *o;
fgVIEW *v;
struct fgBUCKET p;
fgCartesianPoint3d local_ref, offset;
GLint display_list;
@ -240,6 +295,7 @@ void fgTileMgrRender( void ) {
f = current_aircraft.flight;
o = &current_options;
v = &current_view;
/* Find current translation offset */
fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
@ -274,18 +330,21 @@ void fgTileMgrRender( void ) {
}
}
printf("drawn = %d culled = %d saved = %.2f\n", drawn, culled,
(double)culled / (double)(drawn + culled));
v->vfc_ratio = (double)culled / (double)(drawn + culled);
// printf("drawn = %d culled = %d saved = %.2f\n", drawn, culled,
// v->vfc_ratio);
}
/* $Log$
/* Revision 1.9 1998/05/16 13:09:58 curt
/* Beginning to add support for view frustum culling.
/* Added some temporary code to calculate bouding radius, until the
/* scenery generation tools and scenery can be updated.
/* Revision 1.10 1998/05/17 16:59:34 curt
/* Frist pass at view frustum culling now operational.
/*
* Revision 1.9 1998/05/16 13:09:58 curt
* Beginning to add support for view frustum culling.
* Added some temporary code to calculate bouding radius, until the
* scenery generation tools and scenery can be updated.
*
* Revision 1.8 1998/05/07 23:15:21 curt
* Fixed a glTexImage2D() usage bug where width and height were mis-swapped.
* Added support for --tile-radius=n option.