KinematicBody performance and quality improvements

With this change finally one can use compound collisions (like those created
by Gridmaps) without serious performance issues. The previous KinematicBody
code for Bullet was practically doing a whole bunch of unnecessary
calculations. Gridmaps with fairly large octant sizes (in my case 32) can get
up to 10000x speedup with this change (literally!). I expect the FPS demo to
get a fair speedup as well.

List of fixes and improvements:

- Fixed a general bug in move_and_slide that affects both GodotPhysics and
  Bullet, where ray shapes would be ignored unless the stop_on_slope parameter
  is disabled. Not sure where that came from, but looking at the 2D physics
  code it was obvious there's a difference.
- Enabled the dynamic AABB tree that Bullet uses to allow broadphase collision
  tests against individual shapes of compound shapes. This is crucial to get
  good performance with Gridmaps and in general improves the performance
  whenever a KinematicBody collides with compound collision shapes.
- Added code to the broadphase collision detection code used by the Bullet
  module for KinematicBodies to also do broadphase on the sub-shapes of
  compound collision shapes. This is possible thanks to the dynamic AABB
  tree that was previously disabled and it's the change that provides the
  biggest performance boost.
- Now broadphase test is only done once per KinematicBody in Bullet instead of
  once per each of its shapes which was completely unnecessary.
- Fixed the way how the ray separation results are populated in Bullet which
  was completely broken previously, overwriting previous results and similar
  non-sense.
- Fixed ray shapes for good now. Previously the margin set in the editor was
  not respected at all, and the KinematicBody code for ray separation was
  complete bogus, thus all previous attempts to fix it were mislead.
- Fixed an obvious bug also in GodotPhysics where an out-of-bounds index was
  used in the ray result array.

There are a whole set of other problems with the KinematicBody code of Bullet
which cost performance and may cause unexpected behavior, but those are not
addressed in this change (need to keep it "simple").

Not sure whether this fixes any outstanding Github issues but I wouldn't be
surprised.

2 files changed, 9 insertions, 15 deletions

diff --git a/scene/3d/physics_body.cpp b/scene/3d/physics_body.cpp
index 05214ed669..90cc415942 100644
--- a/scene/3d/physics_body.cpp
+++ b/scene/3d/physics_body.cpp
@@ -1181,19 +1181,16 @@ Vector3 KinematicBody::move_and_slide(const Vector3 &p_linear_velocity, const Ve
 	while (p_max_slides) {
 
 		Collision collision;
-
 		bool found_collision = false;
 
-		int test_type = 0;
-
-		do {
+		for (int i = 0; i < 2; ++i) {
 			bool collided;
-			if (test_type == 0) { //collide
+			if (i == 0) { //collide
 				collided = move_and_collide(motion, p_infinite_inertia, collision);
 				if (!collided) {
 					motion = Vector3(); //clear because no collision happened and motion completed
 				}
-			} else {
+			} else { //separate raycasts (if any)
 				collided = separate_raycast_shapes(p_infinite_inertia, collision);
 				if (collided) {
 					collision.remainder = motion; //keep
@@ -1222,7 +1219,7 @@ Vector3 KinematicBody::move_and_slide(const Vector3 &p_linear_velocity, const Ve
 						floor_velocity = collision.collider_vel;
 
 						if (p_stop_on_slope) {
-							if ((lv_n + p_floor_direction).length() < 0.01) {
+							if ((lv_n + p_floor_direction).length() < 0.01 && collision.travel.length() < 1) {
 								Transform gt = get_global_transform();
 								gt.origin -= collision.travel;
 								set_global_transform(gt);
@@ -1243,21 +1240,18 @@ Vector3 KinematicBody::move_and_slide(const Vector3 &p_linear_velocity, const Ve
 					motion = motion.slide(p_floor_direction);
 					lv = lv.slide(p_floor_direction);
 				} else {
-
 					Vector3 n = collision.normal;
 					motion = motion.slide(n);
 					lv = lv.slide(n);
 				}
 
-				for (int i = 0; i < 3; i++) {
-					if (locked_axis & (1 << i)) {
-						lv[i] = 0;
+				for (int j = 0; j < 3; j++) {
+					if (locked_axis & (1 << j)) {
+						lv[j] = 0;
 					}
 				}
 			}
-
-			++test_type;
-		} while (!p_stop_on_slope && test_type < 2);
+		}
 
 		if (!found_collision || motion == Vector3())
 			break;
diff --git a/scene/3d/physics_body.h b/scene/3d/physics_body.h
index 589af98062..aa6030d44e 100644
--- a/scene/3d/physics_body.h
+++ b/scene/3d/physics_body.h
@@ -317,7 +317,7 @@ protected:
 	static void _bind_methods();
 
 public:
-	bool move_and_collide(const Vector3 &p_motion, bool p_infinite_inertia, Collision &r_collisionz, bool p_exclude_raycast_shapes = true, bool p_test_only = false);
+	bool move_and_collide(const Vector3 &p_motion, bool p_infinite_inertia, Collision &r_collision, bool p_exclude_raycast_shapes = true, bool p_test_only = false);
 	bool test_move(const Transform &p_from, const Vector3 &p_motion, bool p_infinite_inertia);
 
 	bool separate_raycast_shapes(bool p_infinite_inertia, Collision &r_collision);