[3.x] Physics Interpolation - refactor Camera and fix get_camera_transform()

core/error_macros.cpp

@@ -34,6 +34,10 @@
 #include "core/ustring.h"
 #include "os/os.h"
 
+#if defined(DEBUG_ENABLED) && defined(TOOLS_ENABLED)
+#include "scene/main/node.h"
+#endif
+
 static ErrorHandlerList *error_handler_list = nullptr;
 
 void add_error_handler(ErrorHandlerList *p_handler) {
@@ -117,3 +121,50 @@ void _err_print_index_error(const char *p_function, const char *p_file, int p_li
 void _err_flush_stdout() {
 	fflush(stdout);
 }
+
+// Prevent error spam by limiting the warnings to a certain frequency.
+void _physics_interpolation_warning(const char *p_function, const char *p_file, int p_line, ObjectID p_id, const char *p_warn_string) {
+#if defined(DEBUG_ENABLED) && defined(TOOLS_ENABLED)
+	const uint32_t warn_max = 2048;
+	const uint32_t warn_timeout_seconds = 15;
+
+	static uint32_t warn_count = warn_max;
+	static uint32_t warn_timeout = warn_timeout_seconds;
+
+	uint32_t time_now = UINT32_MAX;
+
+	if (warn_count) {
+		warn_count--;
+	}
+
+	if (!warn_count) {
+		time_now = OS::get_singleton()->get_ticks_msec() / 1000;
+	}
+
+	if ((warn_count == 0) && (time_now >= warn_timeout)) {
+		warn_count = warn_max;
+		warn_timeout = time_now + warn_timeout_seconds;
+
+		if (GLOBAL_GET("debug/settings/physics_interpolation/enable_warnings")) {
+			// UINT64_MAX means unused.
+			if (p_id == UINT64_MAX) {
+				_err_print_error(p_function, p_file, p_line, "[Physics interpolation] " + String(p_warn_string) + " (possibly benign).", ERR_HANDLER_WARNING);
+			} else {
+				String node_name;
+				if (p_id != 0) {
+					if (ObjectDB::get_instance(p_id)) {
+						Node *node = Object::cast_to<Node>(ObjectDB::get_instance(p_id));
+						if (node && node->is_inside_tree()) {
+							node_name = "\"" + String(node->get_path()) + "\"";
+						} else {
+							node_name = "\"unknown\"";
+						}
+					}
+				}
+
+				_err_print_error(p_function, p_file, p_line, "[Physics interpolation] " + String(p_warn_string) + ": " + node_name + " (possibly benign).", ERR_HANDLER_WARNING);
+			}
+		}
+	}
+#endif
+}

core/error_macros.h

@@ -31,6 +31,7 @@
 #ifndef ERROR_MACROS_H
 #define ERROR_MACROS_H
 
+#include "core/object_id.h"
 #include "core/safe_refcount.h"
 #include "core/typedefs.h"
 
@@ -86,6 +87,8 @@ void _err_print_index_error(const char *p_function, const char *p_file, int p_li
 void _err_print_index_error(const char *p_function, const char *p_file, int p_line, int64_t p_index, int64_t p_size, const char *p_index_str, const char *p_size_str, const String &p_message, bool fatal = false);
 void _err_flush_stdout();
 
+void _physics_interpolation_warning(const char *p_function, const char *p_file, int p_line, ObjectID p_id, const char *p_warn_string);
+
 #ifndef _STR
 #define _STR(m_x) #m_x
 #define _MKSTR(m_x) _STR(m_x)
@@ -558,4 +561,14 @@ void _err_flush_stdout();
 #define DEV_CHECK_ONCE(m_cond)
 #endif
 
+/**
+ * Physics Interpolation warnings.
+ * These are spam protection warnings.
+ */
+#define PHYSICS_INTERPOLATION_NODE_WARNING(m_object_id, m_string) \
+	_physics_interpolation_warning(FUNCTION_STR, __FILE__, __LINE__, m_object_id, m_string)
+
+#define PHYSICS_INTERPOLATION_WARNING(m_string) \
+	_physics_interpolation_warning(FUNCTION_STR, __FILE__, __LINE__, UINT64_MAX, m_string)
+
 #endif // ERROR_MACROS_H

doc/classes/VisualServer.xml

@@ -45,14 +45,6 @@
 				Once finished with your RID, you will want to free the RID using the VisualServer's [method free_rid] static method.
 			</description>
 		</method>
-		<method name="camera_reset_physics_interpolation">
-			<return type="void" />
-			<argument index="0" name="camera" type="RID" />
-			<description>
-				Prevents physics interpolation for the current physics tick.
-				This is useful when moving a [Camera] to a new location, to give an instantaneous change rather than interpolation from the previous location.
-			</description>
-		</method>
 		<method name="camera_set_cull_mask">
 			<return type="void" />
 			<argument index="0" name="camera" type="RID" />
@@ -80,14 +72,6 @@
 				Sets camera to use frustum projection. This mode allows adjusting the [code]offset[/code] argument to create "tilted frustum" effects.
 			</description>
 		</method>
-		<method name="camera_set_interpolated">
-			<return type="void" />
-			<argument index="0" name="camera" type="RID" />
-			<argument index="1" name="interpolated" type="bool" />
-			<description>
-				Turns on and off physics interpolation for the [Camera].
-			</description>
-		</method>
 		<method name="camera_set_orthogonal">
 			<return type="void" />
 			<argument index="0" name="camera" type="RID" />

scene/2d/cpu_particles_2d.cpp

@@ -1267,7 +1267,7 @@ void CPUParticles2D::_notification(int p_what) {
 			}
 		}
 	}
-	if (p_what == NOTIFICATION_RESET_PHYSICS_INTERPOLATION) {
+	if (p_what == NOTIFICATION_RESET_PHYSICS_INTERPOLATION && is_inside_tree()) {
 		// Make sure current is up to date with any pending global transform changes.
 		_interpolation_data.global_xform_curr = get_global_transform_const();
 		_interpolation_data.global_xform_prev = _interpolation_data.global_xform_curr;