package boilerplate.core;

import java.nio.FloatBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL15;

public class VertexBuffer {

	public Vertex[] vertices;
	public int buffer;

	public VertexBuffer(Vertex[] vertices) {
		this.vertices = vertices;

		buffer = GL15.glGenBuffers();

		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, buffer);
		GL15.glBufferData(GL15.GL_ARRAY_BUFFER, asFlippedFloatBuffer(vertices), GL15.GL_STREAM_DRAW);
	}

	private static FloatBuffer asFlippedFloatBuffer(Vertex[] verts) {
		FloatBuffer buffer = BufferUtils.createFloatBuffer(verts.length * Vertex.ELEMENT_COUNT);

		for (int i = 0; i < verts.length; i++) {
			buffer.put(verts[i].getXYZ());
			buffer.put(verts[i].getRGBA());
			buffer.put(verts[i].getUV());
		}

		buffer.flip();

		return buffer;
	}
}