Strip VoxelGIData and LightmapGIData using placeholders for dedicated server exports

doc/classes/LightmapGIData.xml

@@ -25,6 +25,12 @@
 				Clear all objects that are considered baked within this [LightmapGIData].
 			</description>
 		</method>
+		<method name="create_placeholder" qualifiers="const">
+			<return type="Resource" />
+			<description>
+				Creates a placeholder version of this resource ([PlaceholderLightmapGIData]).
+			</description>
+		</method>
 		<method name="get_user_count" qualifiers="const">
 			<return type="int" />
 			<description>

doc/classes/PlaceholderLightmapGIData.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="PlaceholderLightmapGIData" inherits="LightmapGIData" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		Placeholder class for [LightmapGIData].
+	</brief_description>
+	<description>
+		This class is used when loading a project that uses a [LightmapGIData] subclass, if the project was exported in dedicated server mode. In this mode, only the resource reference is kept, with no actual light probe data. This allows reducing the exported PCK's size significantly.
+		[b]Note:[/b] This is not intended to be used as an actual resource for rendering.
+	</description>
+	<tutorials>
+	</tutorials>
+</class>

doc/classes/PlaceholderVoxelGIData.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="PlaceholderVoxelGIData" inherits="VoxelGIData" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		Placeholder class for [VoxelGIData].
+	</brief_description>
+	<description>
+		This class is used when loading a project that uses a [VoxelGIData] subclass, if the project was exported in dedicated server mode. In this mode, only the resource reference is kept, with no actual voxel data. This allows reducing the exported PCK's size significantly.
+		[b]Note:[/b] This is not intended to be used as an actual resource for rendering.
+	</description>
+	<tutorials>
+	</tutorials>
+</class>

doc/classes/VoxelGIData.xml

@@ -23,6 +23,12 @@
 			<description>
 			</description>
 		</method>
+		<method name="create_placeholder" qualifiers="const">
+			<return type="Resource" />
+			<description>
+				Creates a placeholder version of this resource ([PlaceholderVoxelGIData]).
+			</description>
+		</method>
 		<method name="get_bounds" qualifiers="const">
 			<return type="AABB" />
 			<description>

scene/3d/lightmap_gi.cpp

@@ -323,6 +323,12 @@ Array LightmapGIData::_get_light_textures_data() const {
 }
 #endif
 
+Ref<Resource> LightmapGIData::create_placeholder() const {
+	Ref<PlaceholderLightmapGIData> data;
+	data.instantiate();
+	return data;
+}
+
 void LightmapGIData::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_set_user_data", "data"), &LightmapGIData::_set_user_data);
 	ClassDB::bind_method(D_METHOD("_get_user_data"), &LightmapGIData::_get_user_data);
@@ -347,6 +353,8 @@ void LightmapGIData::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_set_probe_data", "data"), &LightmapGIData::_set_probe_data);
 	ClassDB::bind_method(D_METHOD("_get_probe_data"), &LightmapGIData::_get_probe_data);
 
+	ClassDB::bind_method(D_METHOD("create_placeholder"), &LightmapGIData::create_placeholder);
+
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "lightmap_textures", PROPERTY_HINT_ARRAY_TYPE, "TextureLayered", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY), "set_lightmap_textures", "get_lightmap_textures");
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "shadowmask_textures", PROPERTY_HINT_ARRAY_TYPE, "TextureLayered", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY), "set_shadowmask_textures", "get_shadowmask_textures");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "uses_spherical_harmonics", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_uses_spherical_harmonics", "is_using_spherical_harmonics");
@@ -381,6 +389,21 @@ LightmapGIData::~LightmapGIData() {
 
 ///////////////////////////
 
+RID PlaceholderLightmapGIData::get_rid() const {
+	return lightmap;
+}
+
+PlaceholderLightmapGIData::PlaceholderLightmapGIData() {
+	lightmap = RS::get_singleton()->lightmap_create();
+}
+
+PlaceholderLightmapGIData::~PlaceholderLightmapGIData() {
+	ERR_FAIL_NULL(RenderingServer::get_singleton());
+	RS::get_singleton()->free_rid(lightmap);
+}
+
+///////////////////////////
+
 void LightmapGI::_find_meshes_and_lights(Node *p_at_node, Vector<MeshesFound> &meshes, Vector<LightsFound> &lights, Vector<Vector3> &probes) {
 	MeshInstance3D *mi = Object::cast_to<MeshInstance3D>(p_at_node);
 	if (mi && mi->get_gi_mode() == GeometryInstance3D::GI_MODE_STATIC && mi->is_visible_in_tree()) {

scene/3d/lightmap_gi.h

@@ -37,6 +37,7 @@
 
 class Sky;
 class CameraAttributes;
+class PlaceholderLightmapGIData;
 
 class LightmapGIData : public Resource {
 	GDCLASS(LightmapGIData, Resource);
@@ -138,11 +139,24 @@ class LightmapGIData : public Resource {
 	void clear_shadowmask_textures();
 	bool has_shadowmask_textures();
 
+	Ref<Resource> create_placeholder() const;
+
 	virtual RID get_rid() const override;
 	LightmapGIData();
 	~LightmapGIData();
 };
 
+class PlaceholderLightmapGIData : public LightmapGIData {
+	GDCLASS(PlaceholderLightmapGIData, LightmapGIData);
+
+	RID lightmap;
+
+public:
+	virtual RID get_rid() const override;
+	PlaceholderLightmapGIData();
+	~PlaceholderLightmapGIData();
+};
+
 class LightmapGI : public VisualInstance3D {
 	GDCLASS(LightmapGI, VisualInstance3D);
 

scene/3d/voxel_gi.cpp

@@ -225,6 +225,8 @@ void VoxelGIData::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_set_data", "data"), &VoxelGIData::_set_data);
 	ClassDB::bind_method(D_METHOD("_get_data"), &VoxelGIData::_get_data);
 
+	ClassDB::bind_method(D_METHOD("create_placeholder"), &VoxelGIData::create_placeholder);
+
 	ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "_data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_data", "_get_data");
 
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "dynamic_range", PROPERTY_HINT_RANGE, "1,8,0.01"), "set_dynamic_range", "get_dynamic_range");
@@ -264,6 +266,16 @@ VoxelGIData::~VoxelGIData() {
 }
 
 //////////////////////
+
+PlaceholderVoxelGIData::PlaceholderVoxelGIData() {
+	probe = RS::get_singleton()->voxel_gi_create();
+}
+
+PlaceholderVoxelGIData::~PlaceholderVoxelGIData() {
+	ERR_FAIL_NULL(RenderingServer::get_singleton());
+	RS::get_singleton()->free_rid(probe);
+}
+
 //////////////////////
 
 void VoxelGI::set_probe_data(const Ref<VoxelGIData> &p_data) {
@@ -537,6 +549,12 @@ AABB VoxelGI::get_aabb() const {
 	return AABB(-size / 2, size);
 }
 
+Ref<Resource> VoxelGIData::create_placeholder() const {
+	Ref<PlaceholderVoxelGIData> data;
+	data.instantiate();
+	return data;
+}
+
 PackedStringArray VoxelGI::get_configuration_warnings() const {
 	PackedStringArray warnings = VisualInstance3D::get_configuration_warnings();
 

scene/3d/voxel_gi.h

@@ -33,6 +33,7 @@
 #include "scene/3d/visual_instance_3d.h"
 
 class CameraAttributes;
+class PlaceholderVoxelGIData;
 
 class VoxelGIData : public Resource {
 	GDCLASS(VoxelGIData, Resource);
@@ -88,12 +89,24 @@ class VoxelGIData : public Resource {
 	void set_use_two_bounces(bool p_enable);
 	bool is_using_two_bounces() const;
 
+	Ref<Resource> create_placeholder() const;
+
 	virtual RID get_rid() const override;
 
 	VoxelGIData();
 	~VoxelGIData();
 };
 
+class PlaceholderVoxelGIData : public VoxelGIData {
+	GDCLASS(PlaceholderVoxelGIData, VoxelGIData);
+
+	RID probe;
+
+public:
+	PlaceholderVoxelGIData();
+	~PlaceholderVoxelGIData();
+};
+
 class VoxelGI : public VisualInstance3D {
 	GDCLASS(VoxelGI, VisualInstance3D);
 

scene/register_scene_types.cpp

@@ -644,8 +644,10 @@ void register_scene_types() {
 	GDREGISTER_CLASS(Decal);
 	GDREGISTER_CLASS(VoxelGI);
 	GDREGISTER_CLASS(VoxelGIData);
+	GDREGISTER_CLASS(PlaceholderVoxelGIData);
 	GDREGISTER_CLASS(LightmapGI);
 	GDREGISTER_CLASS(LightmapGIData);
+	GDREGISTER_CLASS(PlaceholderLightmapGIData);
 	GDREGISTER_CLASS(LightmapProbe);
 	GDREGISTER_ABSTRACT_CLASS(Lightmapper);
 	GDREGISTER_CLASS(GPUParticles3D);