/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
******************************************************************************/
package com.badlogic.gdx.graphics.glutils;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import com.badlogic.gdx.utils.BufferUtils;
public class IndexArray implements IndexData {
final static IntBuffer tmpHandle = BufferUtils.newIntBuffer(1);
ShortBuffer buffer;
ByteBuffer byteBuffer;
/**
* Creates a new IndexArray to be used with vertex arrays.
*
* @param maxIndices
* the maximum number of indices this buffer can hold
*/
public IndexArray(int maxIndices) {
byteBuffer = BufferUtils.newUnsafeByteBuffer(maxIndices * 2);
buffer = byteBuffer.asShortBuffer();
buffer.flip();
byteBuffer.flip();
}
/** @return the number of indices currently stored in this buffer */
public int getNumIndices() {
return buffer.limit();
}
/** @return the maximum number of indices this IndexArray can store. */
public int getNumMaxIndices() {
return buffer.capacity();
}
/**
* <p>
* Sets the indices of this IndexArray, discarding the old indices. The count must equal the number of indices to be
* copied to this IndexArray.
* </p>
*
* <p>
* This can be called in between calls to {@link #bind()} and {@link #unbind()}. The index data will be updated
* instantly.
* </p>
*
* @param indices
* the vertex data
* @param offset
* the offset to start copying the data from
* @param count
* the number of shorts to copy
*/
public void setIndices(short[] indices, int offset, int count) {
buffer.clear();
buffer.put(indices, offset, count);
buffer.flip();
byteBuffer.position(0);
byteBuffer.limit(count << 1);
}
/**
* <p>
* Returns the underlying ShortBuffer. If you modify the buffer contents they wil be uploaded on the call to
* {@link #bind()}. If you need immediate uploading use {@link #setIndices(short[], int, int)}.
* </p>
*
* @return the underlying short buffer.
*/
public ShortBuffer getBuffer() {
return buffer;
}
/** Binds this IndexArray for rendering with glDrawElements. */
public void bind() {
}
/** Unbinds this IndexArray. */
public void unbind() {
}
/** Invalidates the IndexArray so a new OpenGL buffer handle is created. Use this in case of a context loss. */
public void invalidate() {
}
/** Disposes this IndexArray and all its associated OpenGL resources. */
public void dispose() {
BufferUtils.disposeUnsafeByteBuffer(byteBuffer);
}
}