Improve resource load cache

-Added a new method in Resource: reset_state , used for reloading the same resource from disk
-Added a new cache mode "replace" in ResourceLoader, which reuses existing loaded sub-resources but resets their data from disk (or replaces them if they chaged type)
-Because the correct sub-resource paths are always loaded now, this fixes bugs with subresource folding or subresource ordering when saving.

1 files changed, 6 insertions, 0 deletions

diff --git a/scene/resources/visual_shader.cpp b/scene/resources/visual_shader.cpp
index 73fd01fb00..219cd84aa0 100644
--- a/scene/resources/visual_shader.cpp
+++ b/scene/resources/visual_shader.cpp
@@ -1095,6 +1095,12 @@ bool VisualShader::_get(const StringName &p_name, Variant &r_ret) const {
 	return false;
 }
 
+void VisualShader::reset_state() {
+#ifndef _MSC_VER
+#warning everything needs to be cleared here
+#endif
+	emit_changed();
+}
 void VisualShader::_get_property_list(List<PropertyInfo> *p_list) const {
 	//mode
 	p_list->push_back(PropertyInfo(Variant::INT, "mode", PROPERTY_HINT_ENUM, "Node3D,CanvasItem,Particles,Sky"));