PipelineState.java

package com.bitfire.postprocessing;

import java.nio.ByteBuffer;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.utils.BufferUtils;
import com.badlogic.gdx.utils.Disposable;

/** Provides a simple mechanism to query OpenGL pipeline states. Note: state queries are costly and stall the pipeline, especially
 * on mobile devices!
 * 
 * @author bmanuel */
public final class PipelineState implements Disposable {

	private ByteBuffer byteBuffer;

	protected PipelineState () {
		byteBuffer = BufferUtils.newByteBuffer(32);
	}

	public boolean isEnabled (int pname) {
		boolean ret = false;

		switch (pname) {
		case GL20.GL_BLEND:
			Gdx.gl20.glGetBooleanv(GL20.GL_BLEND, byteBuffer);
			ret = (byteBuffer.get() == 1);
			byteBuffer.clear();
			break;
		default:
			ret = false;
		}

		return ret;
	}

	@Override
	public void dispose () {
	}
}