static gpointer grits_opengl_add(GritsViewer *_opengl, GritsObject *object,
gint key, gboolean sort)
{
g_assert(GRITS_IS_OPENGL(_opengl));
GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
g_mutex_lock(opengl->objects_lock);
struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)(gintptr)key);
if (!level) {
level = g_new0(struct RenderLevel, 1);
g_tree_insert(opengl->objects, (gpointer)(gintptr)key, level);
}
void grits_object_pickdraw(GritsObject *object, GritsOpenGL *opengl, gboolean pick)
{
GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
if (!klass->draw) {
g_warning("GritsObject: draw - Unimplemented");
return;
}
/* Skip hidden objects */
if (object->hidden)
return;
/* Skip object with no signals when picking */
for (int i = 0; pick; i++) {
if (i == NUM_SIGNALS)
return;
if (g_signal_has_handler_pending(object, signals[i], 0, FALSE))
break;
}
/* Support GritsTester */
if (!GRITS_IS_OPENGL(opengl)) {
g_debug("GritsObject: draw - drawing raw object");
klass->draw(object, opengl);
return;
}
/* Calculate distance for LOD and horizon tests */
GritsPoint *center = &object->center;
if ((!(object->skip & GRITS_SKIP_LOD) ||
!(object->skip & GRITS_SKIP_HORIZON)) &&
(center->elev != -EARTH_R)) {
/* LOD test */
gdouble eye[3], obj[3];
grits_viewer_get_location(GRITS_VIEWER(opengl),
&eye[0], &eye[1], &eye[2]);
gdouble elev = eye[2];
lle2xyz(eye[0], eye[1], eye[2],
&eye[0], &eye[1], &eye[2]);
lle2xyz(center->lat, center->lon, center->elev,
&obj[0], &obj[1], &obj[2]);
gdouble dist = distd(obj, eye);
/* Level of detail test */
if (!(object->skip & GRITS_SKIP_LOD)
&& object->lod > 0) {
if (object->lod < dist)
return;
}
/* Horizon test */
if (!(object->skip & GRITS_SKIP_HORIZON)) {
gdouble c = EARTH_R+elev;
gdouble a = EARTH_R;
gdouble horizon = sqrt(c*c - a*a);
if (dist > horizon)
return;
}
}
/* Save state, draw, restore state */
g_mutex_lock(&opengl->sphere_lock);
if (!(object->skip & GRITS_SKIP_STATE)) {
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION); glPushMatrix();
glMatrixMode(GL_MODELVIEW); glPushMatrix();
}
if (!(object->skip & GRITS_SKIP_CENTER))
grits_viewer_center_position(GRITS_VIEWER(opengl),
object->center.lat,
object->center.lon,
object->center.elev);
if (pick && klass->pick)
klass->pick(object, opengl);
else
klass->draw(object, opengl);
if (!(object->skip & GRITS_SKIP_STATE)) {
glPopAttrib();
glMatrixMode(GL_PROJECTION); glPopMatrix();
glMatrixMode(GL_MODELVIEW); glPopMatrix();
}
g_mutex_unlock(&opengl->sphere_lock);
}
