Change material sharing for CMeshSceneNode

irr/include/IMeshSceneNode.h

@@ -34,16 +34,16 @@ public:
 	/** \return Pointer to mesh which is displayed by this node. */
 	virtual IMesh *getMesh(void) = 0;
 
-	//! Sets if the scene node should not copy the materials of the mesh but use them in a read only style.
+	//! Sets if the scene node should not copy the materials of the mesh but use them directly.
 	/** In this way it is possible to change the materials of a mesh
 	causing all mesh scene nodes referencing this mesh to change, too.
-	\param readonly Flag if the materials shall be read-only. */
-	virtual void setReadOnlyMaterials(bool readonly) = 0;
+	\param shared Flag if the materials shall be shared. */
+	virtual void setSharedMaterials(bool shared) = 0;
 
-	//! Check if the scene node should not copy the materials of the mesh but use them in a read only style
-	/** This flag can be set by setReadOnlyMaterials().
-	\return Whether the materials are read-only. */
-	virtual bool isReadOnlyMaterials() const = 0;
+	//! Check if the scene node does not copy the materials of the mesh but uses them directly.
+	/** This flag can be set by setSharedMaterials().
+	\return Whether the materials are shared. */
+	virtual bool isSharedMaterials() const = 0;
 };
 
 } // end namespace scene

irr/src/CMeshSceneNode.cpp

@@ -21,7 +21,7 @@ CMeshSceneNode::CMeshSceneNode(IMesh *mesh, ISceneNode *parent, ISceneManager *m
 		const core::vector3df &scale) :
 		IMeshSceneNode(parent, mgr, id, position, rotation, scale),
 		Mesh(0),
-		PassCount(0), ReadOnlyMaterials(false)
+		PassCount(0), SharedMaterials(false)
 {
 	setMesh(mesh);
 }
@@ -49,9 +49,9 @@ void CMeshSceneNode::OnRegisterSceneNode()
 		int solidCount = 0;
 
 		// count transparent and solid materials in this scene node
-		const u32 numMaterials = ReadOnlyMaterials ? Mesh->getMeshBufferCount() : Materials.size();
+		const u32 numMaterials = SharedMaterials ? Mesh->getMeshBufferCount() : Materials.size();
 		for (u32 i = 0; i < numMaterials; ++i) {
-			const video::SMaterial &material = ReadOnlyMaterials ? Mesh->getMeshBuffer(i)->getMaterial() : Materials[i];
+			const auto &material = SharedMaterials ? Mesh->getMeshBuffer(i)->getMaterial() : Materials[i];
 
 			if (driver->needsTransparentRenderPass(material))
 				++transparentCount;
@@ -93,7 +93,7 @@ void CMeshSceneNode::render()
 	for (u32 i = 0; i < Mesh->getMeshBufferCount(); ++i) {
 		scene::IMeshBuffer *mb = Mesh->getMeshBuffer(i);
 		if (mb) {
-			const video::SMaterial &material = ReadOnlyMaterials ? mb->getMaterial() : Materials[i];
+			const auto &material = SharedMaterials ? mb->getMaterial() : Materials[i];
 
 			const bool transparent = driver->needsTransparentRenderPass(material);
 
@@ -164,14 +164,10 @@ const core::aabbox3d<f32> &CMeshSceneNode::getBoundingBox() const
 
 //! returns the material based on the zero based index i. To get the amount
 //! of materials used by this scene node, use getMaterialCount().
-//! This function is needed for inserting the node into the scene hierarchy on a
-//! optimal position for minimizing renderstate changes, but can also be used
-//! to directly modify the material of a scene node.
 video::SMaterial &CMeshSceneNode::getMaterial(u32 i)
 {
-	if (Mesh && ReadOnlyMaterials && i < Mesh->getMeshBufferCount()) {
-		ReadOnlyMaterial = Mesh->getMeshBuffer(i)->getMaterial();
-		return ReadOnlyMaterial;
+	if (Mesh && SharedMaterials && i < Mesh->getMeshBufferCount()) {
+		return Mesh->getMeshBuffer(i)->getMaterial();
 	}
 
 	if (i >= Materials.size())
@@ -183,7 +179,7 @@ video::SMaterial &CMeshSceneNode::getMaterial(u32 i)
 //! returns amount of materials used by this scene node.
 u32 CMeshSceneNode::getMaterialCount() const
 {
-	if (Mesh && ReadOnlyMaterials)
+	if (Mesh && SharedMaterials)
 		return Mesh->getMeshBufferCount();
 
 	return Materials.size();
@@ -206,9 +202,10 @@ void CMeshSceneNode::copyMaterials()
 {
 	Materials.clear();
 
-	if (Mesh) {
+	if (Mesh && !SharedMaterials) {
 		video::SMaterial mat;
 
+		Materials.reserve(Mesh->getMeshBufferCount());
 		for (u32 i = 0; i < Mesh->getMeshBufferCount(); ++i) {
 			IMeshBuffer *mb = Mesh->getMeshBuffer(i);
 			if (mb)
@@ -222,15 +219,18 @@ void CMeshSceneNode::copyMaterials()
 //! Sets if the scene node should not copy the materials of the mesh but use them in a read only style.
 /* In this way it is possible to change the materials a mesh causing all mesh scene nodes
 referencing this mesh to change too. */
-void CMeshSceneNode::setReadOnlyMaterials(bool readonly)
+void CMeshSceneNode::setSharedMaterials(bool shared)
 {
-	ReadOnlyMaterials = readonly;
+	if (SharedMaterials != shared) {
+		SharedMaterials = shared;
+		copyMaterials();
+	}
 }
 
 //! Returns if the scene node should not copy the materials of the mesh but use them in a read only style
-bool CMeshSceneNode::isReadOnlyMaterials() const
+bool CMeshSceneNode::isSharedMaterials() const
 {
-	return ReadOnlyMaterials;
+	return SharedMaterials;
 }
 
 //! Creates a clone of this scene node and its children.
@@ -245,7 +245,7 @@ ISceneNode *CMeshSceneNode::clone(ISceneNode *newParent, ISceneManager *newManag
 			newManager, ID, RelativeTranslation, RelativeRotation, RelativeScale);
 
 	nb->cloneMembers(this, newManager);
-	nb->ReadOnlyMaterials = ReadOnlyMaterials;
+	nb->SharedMaterials = SharedMaterials;
 	nb->Materials = Materials;
 
 	if (newParent)

irr/src/CMeshSceneNode.h

@@ -52,13 +52,16 @@ public:
 	//! Returns the current mesh
 	IMesh *getMesh(void) override { return Mesh; }
 
-	//! Sets if the scene node should not copy the materials of the mesh but use them in a read only style.
-	/* In this way it is possible to change the materials a mesh causing all mesh scene nodes
-	referencing this mesh to change too. */
-	void setReadOnlyMaterials(bool readonly) override;
+	//! Sets if the scene node should not copy the materials of the mesh but use them directly.
+	/** In this way it is possible to change the materials of a mesh
+	causing all mesh scene nodes referencing this mesh to change, too.
+	\param shared Flag if the materials shall be shared. */
+	void setSharedMaterials(bool shared) override;
 
-	//! Returns if the scene node should not copy the materials of the mesh but use them in a read only style
-	bool isReadOnlyMaterials() const override;
+	//! Check if the scene node does not copy the materials of the mesh but uses them directly.
+	/** This flag can be set by setSharedMaterials().
+	\return Whether the materials are shared. */
+	bool isSharedMaterials() const override;
 
 	//! Creates a clone of this scene node and its children.
 	ISceneNode *clone(ISceneNode *newParent = 0, ISceneManager *newManager = 0) override;
@@ -71,14 +74,13 @@ public:
 protected:
 	void copyMaterials();
 
-	core::array<video::SMaterial> Materials;
+	std::vector<video::SMaterial> Materials;
 	core::aabbox3d<f32> Box{{0, 0, 0}};
-	video::SMaterial ReadOnlyMaterial;
 
 	IMesh *Mesh;
 
 	s32 PassCount;
-	bool ReadOnlyMaterials;
+	bool SharedMaterials;
 };
 
 } // end namespace scene

src/client/wieldmesh.cpp

@@ -204,7 +204,6 @@ WieldMeshSceneNode::WieldMeshSceneNode(scene::ISceneManager *mgr, s32 id):
 	// Create the child scene node
 	scene::IMesh *dummymesh = g_extrusion_mesh_cache->createCube();
 	m_meshnode = SceneManager->addMeshSceneNode(dummymesh, this, -1);
-	m_meshnode->setReadOnlyMaterials(false);
 	m_meshnode->setVisible(false);
 	dummymesh->drop(); // m_meshnode grabbed it