/**
* Returns the buffer for the attribute at the provided index, or null if none can be found. The
* buffer is returned filled and ready for reading.
*
* @param index The index to lookup
* @return The attribute buffer, filled and flipped
*/
public ByteBuffer getAttributeBuffer(int index) {
final VertexAttribute attribute = getAttribute(index);
if (attribute == null) {
return null;
}
return attribute.getData();
}
/**
* Returns the name of the attribute at the provided index, or null if none can be found.
*
* @param index The index to lookup
* @return The name of the attribute, or null if none can be found
*/
public String getAttributeName(int index) {
final VertexAttribute attribute = getAttribute(index);
if (attribute == null) {
return null;
}
return attribute.getName();
}
/**
* Returns the type of the attribute at the provided index, or null if none can be found.
*
* @param index The index to lookup
* @return The type of the attribute, or null if none can be found
*/
public DataType getAttributeType(int index) {
final VertexAttribute attribute = getAttribute(index);
if (attribute == null) {
return null;
}
return attribute.getType();
}
/**
* Returns the size of the attribute at the provided index, or -1 if none can be found.
*
* @param index The index to lookup
* @return The size of the attribute, or -1 if none can be found
*/
public int getAttributeSize(int index) {
final VertexAttribute attribute = getAttribute(index);
if (attribute == null) {
return -1;
}
return attribute.getSize();
}
/**
* Erweitert die Geometrie um ein Vertexattribut vom Typ GL_FLOAT.
*
* @param index Index / Location des Attributs
* @param size Anzahl der Komponenten des Attributs
* @param offset Offset im Vertex gemessen in Byte
*/
public void addVertexAttribute(int index, int size, int offset) {
VertexAttribute attr = new VertexAttribute();
attr.index = index;
attr.size = size;
attr.offset = offset;
attributes.add(attr);
}
private int calculateOffsets() {
int count = 0;
for (int i = 0; i < attributes.length; i++) {
VertexAttribute attribute = attributes[i];
attribute.offset = count;
if (attribute.usage == VertexAttributes.Usage.ColorPacked) count += 4;
else count += 4 * attribute.numComponents;
}
return count;
}
/**
* Adds an attribute.
*
* @param attribute The attribute to add
*/
public void addAttribute(int index, VertexAttribute attribute) {
attributes.put(index, attribute);
nameToIndex.put(attribute.getName(), index);
}
