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Change the extra culling to do only a quarter of the scene every 200

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frames rather than the whole thing, to avoid tiny stutters.
This commit is contained in:
david 2002-07-25 17:47:42 +00:00
parent e7e576055f
commit 9bf3c10743
1 changed files with 24 additions and 10 deletions
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34
src/Main/main.cxx
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@ -647,20 +647,34 @@ void fgRenderFrame() {
ssgSetNearFar( scene_nearplane, scene_farplane );
ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
// This is a bit kludgy. Every 200 frames, do an extra traversal
// of the scene graph without drawing anything and with frustum
// culling disabled. This ensures that out-of-range random
// objects that are not in the current view frustum will still be
// freed properly.
// This is a bit kludgy. Every 200 frames, do an extra
// traversal of the scene graph without drawing anything and
// the frustum set to a different 25% of the full range of
// view. This ensures that out-of-range random objects that
// are not in the current view frustum will still be freed
// properly.
static int counter = 0;
if (++counter == 200) {
// We disable frustrum testing, so
// the default is fine.
counter++;
if (counter % 200 == 0) {
sgFrustum f;
switch (counter) {
case 200:
f.setFrustum(SG_180, SG_ZERO, SG_90, SG_ZERO, 0, 500000000);
break;
case 400:
f.setFrustum(SG_ZERO, SG_180, SG_90, SG_ZERO, 0, 500000000);
break;
case 600:
f.setFrustum(SG_180, SG_ZERO, SG_ZERO, SG_90, 0, 500000000);
break;
case 800:
f.setFrustum(SG_ZERO, SG_180, SG_ZERO, SG_90, 0, 500000000);
counter = 0;
break;
}
sgMat4 m;
ssgGetModelviewMatrix(m);
globals->get_scenery()->get_scene_graph()->cull(&f, m, false);
counter = 0;
globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
}
// change state for lighting here