package k8.buffer.vbo;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import k8.buffer.IndicesBuffer;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.ARBVertexBufferObject;
public final class VBOIndicesBuffer extends IndicesBuffer {
private int id;
/**
* Creates an instance of VBOIndicesBuffer.
*
* @param capacity
* Initial capacity (number of vertices)
*/
public VBOIndicesBuffer(int capacity) {
super(capacity);
IntBuffer int_buffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
ARBVertexBufferObject.glGenBuffersARB(int_buffer);
id = int_buffer.get(0);
}
@Override
public void destroy() {
IntBuffer int_buffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
int_buffer.put(id);
ARBVertexBufferObject.glDeleteBuffersARB(int_buffer);
}
@Override
public void glDrawElements() {
ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ELEMENT_ARRAY_BUFFER_ARB, id);
if ( flush ) {
buffer.rewind();
ARBVertexBufferObject.glBufferDataARB(ARBVertexBufferObject.GL_ELEMENT_ARRAY_BUFFER_ARB, buffer, ARBVertexBufferObject.GL_STATIC_DRAW_ARB);
flush = false;
}
GL11.glDrawElements(GL11.GL_TRIANGLES, elements, GL11.GL_UNSIGNED_INT, 0);
}
}