fly/flightgear
1
0
Fork 0
Code Activity

Add support for drawing only a portion of the configured view frustum. This

Browse source 
is one way to get an asymmetric view frustum without needing to compute the
sgFrustum parameters directly.
This commit is contained in:
curt 2005-02-25 22:27:15 +00:00
parent 5accfdeb90
commit c6c094034c
2 changed files with 60 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

75
src/Main/renderer.cxx
View file

@ -818,25 +818,64 @@ FGRenderer::resize( int width, int height ) {
static void fgHackFrustum() {
#if 0
/* experiment in assymetric view frustums */
sgFrustum *f = ssgGetFrustum();
cout << " l = " << f->getLeft()
<< " r = " << f->getRight()
<< " b = " << f->getBot()
<< " t = " << f->getTop()
<< " n = " << f->getNear()
<< " f = " << f->getFar()
<< endl;
static double incr = 0.0;
double factor = (sin(incr) + 1.0) / 2.0; // map to [0-1]
double w = (f->getRight() - f->getLeft()) / 2.0;
double l = f->getLeft() + w * factor;
double r = l + w;
ssgSetFrustum(l, r, f->getBot(), f->getTop(), f->getNear(), f->getFar());
incr += 0.001;
#endif
// specify a percent of the configured view frustum to actually
// display. This is a bit of a hack to achieve asymmetric view
// frustums. For instance, if you want to display two monitors
// side by side, you could specify each with a double fov, a 0.5
// aspect ratio multiplier, and then the left side monitor would
// have a left_pct = 0.0, a right_pct = 0.5, a bottom_pct = 0.0,
// and a top_pct = 1.0. The right side monitor would have a
// left_pct = 0.5 and a right_pct = 1.0.
static SGPropertyNode *left_pct
= fgGetNode("/sim/current-view/frustum-left-pct");
static SGPropertyNode *right_pct
= fgGetNode("/sim/current-view/frustum-right-pct");
static SGPropertyNode *bottom_pct
= fgGetNode("/sim/current-view/frustum-bottom-pct");
static SGPropertyNode *top_pct
= fgGetNode("/sim/current-view/frustum-top-pct");
sgFrustum *f = ssgGetFrustum();
// cout << " l = " << f->getLeft()
// << " r = " << f->getRight()
// << " b = " << f->getBot()
// << " t = " << f->getTop()
// << " n = " << f->getNear()
// << " f = " << f->getFar()
// << endl;
double width = f->getRight() - f->getLeft();
double height = f->getTop() - f->getBot();
double l, r, t, b;
if ( left_pct != NULL ) {
l = f->getLeft() + width * left_pct->getDoubleValue();
} else {
l = f->getLeft();
}
if ( right_pct != NULL ) {
r = f->getLeft() + width * right_pct->getDoubleValue();
} else {
r = f->getRight();
}
if ( bottom_pct != NULL ) {
b = f->getBot() + height * bottom_pct->getDoubleValue();
} else {
b = f->getBot();
}
if ( top_pct != NULL ) {
t = f->getBot() + height * top_pct->getDoubleValue();
} else {
t = f->getTop();
}
ssgSetFrustum(l, r, b, t, f->getNear(), f->getFar());
}

4
src/Main/viewmgr.cxx
View file

@ -54,12 +54,14 @@ FGViewMgr::init ()
// double damp_alt;
double damp_roll = 0.0, damp_pitch = 0.0, damp_heading = 0.0;
double x_offset_m, y_offset_m, z_offset_m, fov_deg;
double aspect_ratio_multiplier = 1.0;
double heading_offset_deg, pitch_offset_deg, roll_offset_deg;
double target_x_offset_m, target_y_offset_m, target_z_offset_m;
double near_m;
bool internal;
double aspect_ratio_multiplier
= fgGetDouble("/sim/current-view/aspect-ratio-multiplier");
for (int i = 0; i < fgGetInt("/sim/number-views"); i++) {
viewpath = "/sim/view";
sprintf(stridx, "[%d]", i);