Use Jolt Physics in all 3D demos that use physics, improve physics tests demos (#1195)

- Add options for physics ticks per second, time scale, max physics steps per frame
  and physics interpolation to the 2D and 3D physics tests demos.
  - Physics ticks per second are always multiplied by time scale so that
    time scale does not affect the physics simulation quality.
- Enable 4× MSAA for better debug shape display. Remove meshes/lights as
  the debug collision fill make these unnecessary.
  - Switch to the Mobile rendering method in the 2D physics tests demo
    to allow for 2D MSAA, as it's not implemented in Compatibility yet.
- Improve collision shapes color in the 2D and 3D physics tests demos
  for better visibility. Each PhysicsBody type now has its own collision
  shape color.

3d/physics_tests/utils/label_engine.gd

@@ -5,6 +5,8 @@ func _ready() -> void:
 	match System.get_physics_engine():
 		System.PhysicsEngine.GODOT_PHYSICS:
 			engine_name = "GodotPhysics 3D"
+		System.PhysicsEngine.JOLT_PHYSICS:
+			engine_name = "Jolt Physics"
 		System.PhysicsEngine.OTHER:
 			var engine_setting := str(ProjectSettings.get_setting("physics/3d/physics_engine"))
 			engine_name = "Other (%s)" % engine_setting

3d/physics_tests/utils/max_steps_per_frame.gd

@@ -0,0 +1,6 @@
+extends HBoxContainer
+
+
+func _on_h_slider_value_changed(value: float) -> void:
+	$Value.text = str(roundi(value))
+	Engine.max_physics_steps_per_frame = roundi(value)

3d/physics_tests/utils/max_steps_per_frame.gd.uid

@@ -0,0 +1 @@
+uid://cvoeuonqmsye1

3d/physics_tests/utils/physics_interpolation.gd

@@ -0,0 +1,5 @@
+extends CheckButton
+
+
+func _on_check_button_toggled(toggled_on: bool) -> void:
+	get_tree().physics_interpolation = toggled_on

3d/physics_tests/utils/physics_interpolation.gd.uid

@@ -0,0 +1 @@
+uid://ijebwwx4t8et

3d/physics_tests/utils/system.gd

@@ -2,6 +2,7 @@ extends Node
 
 enum PhysicsEngine {
 	GODOT_PHYSICS,
+	JOLT_PHYSICS,
 	OTHER,
 }
 
@@ -20,6 +21,8 @@ func _enter_tree() -> void:
 			_engine = PhysicsEngine.GODOT_PHYSICS
 		"GodotPhysics3D":
 			_engine = PhysicsEngine.GODOT_PHYSICS
+		"Jolt Physics":
+			_engine = PhysicsEngine.JOLT_PHYSICS
 		_:
 			_engine = PhysicsEngine.OTHER
 

3d/physics_tests/utils/ticks_per_second.gd

@@ -0,0 +1,6 @@
+extends HBoxContainer
+
+
+func _on_h_slider_value_changed(value: float) -> void:
+	$Value.text = str(roundi(value))
+	Engine.physics_ticks_per_second = roundi(value * Engine.time_scale)

3d/physics_tests/utils/ticks_per_second.gd.uid

@@ -0,0 +1 @@
+uid://7kql0xtuc7ny

3d/physics_tests/utils/time_scale.gd

@@ -0,0 +1,8 @@
+extends HBoxContainer
+
+
+func _on_h_slider_value_changed(value: float) -> void:
+	value = maxf(0.1, value)
+	$Value.text = "%.1f×" % value
+	Engine.time_scale = value
+	Engine.physics_ticks_per_second = $"../TicksPerSecond/HSlider".value * value

3d/physics_tests/utils/time_scale.gd.uid

@@ -0,0 +1 @@
+uid://beqnv31yip0bl