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package com.github.dabasan.joglf.gl.tool;

import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import com.github.dabasan.basis.coloru8.ColorU8;
import com.github.dabasan.basis.matrix.Matrix;
import com.github.dabasan.basis.vector.Vector;
import com.jogamp.common.nio.Buffers;

/**
 * Provides methods to handle buffers.
 * 
 * @author Daba
 *
 */
public class BufferFunctions {
	public static String GetStringFromByteBuffer(ByteBuffer b) {
		final byte[] byte_array = new byte[b.remaining()];
		b.get(byte_array);

		b.flip();

		return new String(byte_array, 0, byte_array.length - 1);
	}

	public static IntBuffer CopyIntBuffer(IntBuffer b) {
		final IntBuffer copied = Buffers.newDirectIntBuffer(b.capacity());

		final int cap = b.capacity();
		for (int i = 0; i < cap; i++) {
			copied.put(b.get(i));
		}
		copied.flip();

		return copied;
	}
	public static FloatBuffer CopyFloatBuffer(FloatBuffer b) {
		final FloatBuffer copied = Buffers.newDirectFloatBuffer(b.capacity());

		final int cap = b.capacity();
		for (int i = 0; i < cap; i++) {
			copied.put(b.get(i));
		}
		copied.flip();

		return copied;
	}

	public static FloatBuffer MakeFloatBufferFromColorU8(ColorU8 c) {
		final FloatBuffer buffer = Buffers.newDirectFloatBuffer(4);

		buffer.put(c.GetR());
		buffer.put(c.GetG());
		buffer.put(c.GetB());
		buffer.put(c.GetA());

		buffer.flip();

		return buffer;
	}
	public static FloatBuffer MakeFloatBufferFromVector(Vector v) {
		final FloatBuffer buffer = Buffers.newDirectFloatBuffer(3);

		buffer.put(v.GetX());
		buffer.put(v.GetY());
		buffer.put(v.GetZ());

		buffer.flip();

		return buffer;
	}
	public static FloatBuffer MakeFloatBufferFromMatrix(Matrix m) {
		final FloatBuffer buffer = Buffers.newDirectFloatBuffer(16);

		for (int i = 0; i < 4; i++) {
			for (int j = 0; j < 4; j++) {
				buffer.put(m.GetValue(i, j));
			}
		}

		buffer.flip();

		return buffer;
	}
}