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Physics Interpolation - Move 3D FTI to SceneTree

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Moves 3D interpolation from server to the client code (`SceneTree`).
Complete rework of 3D physics interpolation, but using the same user API.
This commit is contained in:
lawnjelly
2025-03-14 10:02:43 +00:00
parent 8954125990
commit ae04a3a5dd
30 changed files with 1030 additions and 432 deletions
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19
scene/main/scene_tree.cpp
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@@ -588,6 +588,8 @@ void SceneTree::set_physics_interpolation_enabled(bool p_enabled) {
_physics_interpolation_enabled = p_enabled;
RenderingServer::get_singleton()->set_physics_interpolation_enabled(p_enabled);
get_scene_tree_fti().set_enabled(get_root(), p_enabled);
// Perform an auto reset on the root node for convenience for the user.
if (root) {
root->reset_physics_interpolation();
@@ -615,6 +617,7 @@ void SceneTree::iteration_prepare() {
// Make sure any pending transforms from the last tick / frame
// are flushed before pumping the interpolation prev and currents.
flush_transform_notifications();
get_scene_tree_fti().tick_update();
RenderingServer::get_singleton()->tick();
}
}
@@ -669,6 +672,17 @@ void SceneTree::iteration_end() {
}
bool SceneTree::process(double p_time) {
// First pass of scene tree fixed timestep interpolation.
if (get_scene_tree_fti().is_enabled()) {
// Special, we need to ensure RenderingServer is up to date
// with *all* the pending xforms *before* updating it during
// the FTI update.
// If this is not done, we can end up with a deferred `set_transform()`
// overwriting the interpolated xform in the server.
flush_transform_notifications();
get_scene_tree_fti().frame_update(get_root(), true);
}
if (MainLoop::process(p_time)) {
_quit = true;
}
@@ -750,6 +764,11 @@ bool SceneTree::process(double p_time) {
#endif // _3D_DISABLED
#endif // TOOLS_ENABLED
// Second pass of scene tree fixed timestep interpolation.
// ToDo: Possibly needs another flush_transform_notifications here
// depending on whether there are side effects to _call_idle_callbacks().
get_scene_tree_fti().frame_update(get_root(), false);
if (_physics_interpolation_enabled) {
RenderingServer::get_singleton()->pre_draw(true);
}