Fixed a severe performance penalty in .x loader.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@941 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CXMeshFileLoader.cpp

@@ -234,6 +234,14 @@ bool CXMeshFileLoader::load(io::IReadFile* file)
 			}
 
 			// store vertices in buffers and remember relation in verticesLink
+			u32* vCountArray = new u32[mesh->Buffers.size()];
+			memset(vCountArray, 0, mesh->Buffers.size()*sizeof(u32));
+			// count vertices in each buffer and reallocate
+			for (i=0;i<mesh->Vertices.size();++i)
+				++vCountArray[verticesLinkBuffer[i]];
+			for (i=0; i!=mesh->Buffers.size(); ++i)
+				mesh->Buffers[i]->Vertices_Standard.reallocate(vCountArray[i]);
+			// actually store vertices
 			for (i=0;i<mesh->Vertices.size();++i)
 			{
 				scene::SSkinMeshBuffer *buffer = mesh->Buffers[ verticesLinkBuffer[i] ];
@@ -242,16 +250,19 @@ bool CXMeshFileLoader::load(io::IReadFile* file)
 				buffer->Vertices_Standard.push_back( mesh->Vertices[i] );
 			}
 
+			// count indices per buffer and reallocate
+			memset(vCountArray, 0, mesh->Buffers.size()*sizeof(u32));
+			for (i=0;i<mesh->FaceMaterialIndices.size();++i)
+				++vCountArray[ mesh->FaceMaterialIndices[i] ];
+			for (i=0; i!=mesh->Buffers.size(); ++i)
+				mesh->Buffers[i]->Indices.reallocate(vCountArray[i]);
+			delete [] vCountArray;
 			// create indices per buffer
 			for (i=0;i<mesh->FaceMaterialIndices.size();++i)
 			{
 				scene::SSkinMeshBuffer *buffer = mesh->Buffers[ mesh->FaceMaterialIndices[i] ];
-				buffer->Indices.reallocate(buffer->Indices.size()+3);
-
 				for (u32 id=i*3+0;id!=i*3+3;++id)
-				{
 					buffer->Indices.push_back( verticesLink[ mesh->Indices[id] ] );
-				}
 			}
 
 			for (i=0; i<AnimatedMesh->getAllJoints().size(); ++i)