Add basic multimesh data needed for headless export to the Dummy rendering server

servers/rendering/dummy/storage/mesh_storage.cpp

@@ -63,3 +63,33 @@ void MeshStorage::mesh_clear(RID p_mesh) {
 
 	m->surfaces.clear();
 }
+
+RID MeshStorage::multimesh_allocate() {
+	return multimesh_owner.allocate_rid();
+}
+
+void MeshStorage::multimesh_initialize(RID p_rid) {
+	multimesh_owner.initialize_rid(p_rid, DummyMultiMesh());
+}
+
+void MeshStorage::multimesh_free(RID p_rid) {
+	DummyMultiMesh *multimesh = multimesh_owner.get_or_null(p_rid);
+	ERR_FAIL_NULL(multimesh);
+
+	multimesh_owner.free(p_rid);
+}
+
+void MeshStorage::multimesh_set_buffer(RID p_multimesh, const Vector<float> &p_buffer) {
+	DummyMultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+	ERR_FAIL_NULL(multimesh);
+	multimesh->buffer.resize(p_buffer.size());
+	float *cache_data = multimesh->buffer.ptrw();
+	memcpy(cache_data, p_buffer.ptr(), p_buffer.size() * sizeof(float));
+}
+
+Vector<float> MeshStorage::multimesh_get_buffer(RID p_multimesh) const {
+	DummyMultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+	ERR_FAIL_NULL_V(multimesh, Vector<float>());
+
+	return multimesh->buffer;
+}

servers/rendering/dummy/storage/mesh_storage.h

@@ -50,6 +50,12 @@ private:
 
 	mutable RID_Owner<DummyMesh> mesh_owner;
 
+	struct DummyMultiMesh {
+		PackedFloat32Array buffer;
+	};
+
+	mutable RID_Owner<DummyMultiMesh> multimesh_owner;
+
 public:
 	static MeshStorage *get_singleton() {
 		return singleton;
@@ -131,9 +137,9 @@ public:
 
 	/* MULTIMESH API */
 
-	virtual RID multimesh_allocate() override { return RID(); }
-	virtual void multimesh_initialize(RID p_rid) override {}
-	virtual void multimesh_free(RID p_rid) override {}
+	virtual RID multimesh_allocate() override;
+	virtual void multimesh_initialize(RID p_rid) override;
+	virtual void multimesh_free(RID p_rid) override;
 
 	virtual void multimesh_allocate_data(RID p_multimesh, int p_instances, RS::MultimeshTransformFormat p_transform_format, bool p_use_colors = false, bool p_use_custom_data = false) override {}
 	virtual int multimesh_get_instance_count(RID p_multimesh) const override { return 0; }
@@ -151,8 +157,8 @@ public:
 	virtual Transform2D multimesh_instance_get_transform_2d(RID p_multimesh, int p_index) const override { return Transform2D(); }
 	virtual Color multimesh_instance_get_color(RID p_multimesh, int p_index) const override { return Color(); }
 	virtual Color multimesh_instance_get_custom_data(RID p_multimesh, int p_index) const override { return Color(); }
-	virtual void multimesh_set_buffer(RID p_multimesh, const Vector<float> &p_buffer) override {}
-	virtual Vector<float> multimesh_get_buffer(RID p_multimesh) const override { return Vector<float>(); }
+	virtual void multimesh_set_buffer(RID p_multimesh, const Vector<float> &p_buffer) override;
+	virtual Vector<float> multimesh_get_buffer(RID p_multimesh) const override;
 
 	virtual void multimesh_set_visible_instances(RID p_multimesh, int p_visible) override {}
 	virtual int multimesh_get_visible_instances(RID p_multimesh) const override { return 0; }