Added a method to VertexIndex to determine the size in bytes of an element in the index array

src/modules/graphics/opengl/VertexBuffer.cpp

@@ -253,6 +253,7 @@ VertexBuffer *VertexIndex::element_array = NULL;
 
 VertexIndex::VertexIndex(size_t size)
 	: size(size)
+	, elementSize(0)
 {
 	// The upper limit is the maximum of GLuint divided by six (the number
 	// of indices per size) and divided by the size of GLuint. This guarantees
@@ -287,6 +288,11 @@ GLenum VertexIndex::getType(size_t s) const
 	// if buffer-size > max(GLushort) then GL_UNSIGNED_INT else GL_UNSIGNED_SHORT
 }
 
+size_t VertexIndex::getElementSize()
+{
+	return elementSize;
+}
+
 VertexBuffer *VertexIndex::getVertexBuffer() const
 {
 	return element_array;
@@ -342,9 +348,12 @@ void VertexIndex::resize(size_t size)
 	}
 
 	VertexBuffer *new_element_array;
+	
 	// Depending on the size, a switch to int and more memory is needed.
 	GLenum target_type = getType(size);
-	size_t array_size = (target_type == GL_UNSIGNED_SHORT ? sizeof(GLushort) : sizeof(GLuint)) * 6 * size;
+	size_t elem_size = (target_type == GL_UNSIGNED_SHORT) ? sizeof(GLushort) : sizeof(GLuint);
+
+	size_t array_size = elem_size * 6 * size;
 
 	// Create may throw out-of-memory exceptions.
 	// VertexIndex will propagate the exception and keep the old VertexBuffer.
@@ -362,6 +371,7 @@ void VertexIndex::resize(size_t size)
 	delete element_array;
 	element_array = new_element_array;
 	maxSize = size;
+	elementSize = elem_size;
 
 	switch (target_type)
 	{