package java3d;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ShortBuffer;

public abstract class IndexedGeometryArray extends GeometryArray {

	protected int indexCount;
	protected ShortBuffer indexBuffer = null;

	// コンストラクタ
	public IndexedGeometryArray(int vertexCount, int vertexFormat, int indexCount) {
		super(vertexCount, vertexFormat);
		this.indexCount = indexCount;
		ByteBuffer vbb = ByteBuffer.allocateDirect(indexCount * 2);
		vbb.order(ByteOrder.nativeOrder());
		indexBuffer = vbb.asShortBuffer();
	}

	/** オブジェクトのインデックス数を取得する */
	public int getIndexCount() {
		return indexCount;
	}

	public int getCoordinateIndex(int index) {
		return indexBuffer.get(index);
	}

	public void setCoordinateIndex(int index, int coordinateIndex) {
		indexBuffer.put(index, (short)coordinateIndex);
	}

	public void setCoordinateIndices(int index, int[] coordinateIndicies) {
		indexBuffer.position(index);
		for (int i = 0; i < coordinateIndicies.length; i++) {
			indexBuffer.put((short)coordinateIndicies[i]);
		}
		indexBuffer.position(0);
	}
	
	public ShortBuffer getIndexBuffer() {
		return indexBuffer;
	}
}