Bias.java

/*******************************************************************************
 * Copyright 2012 tsagrista
 *
 * 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.bitfire.postprocessing.filters;

import com.bitfire.utils.ShaderLoader;

/** Bias filter. Adapted for lensflare2 effect.
 * @see <a
 *      href="http://john-chapman-graphics.blogspot.co.uk/2013/02/pseudo-lens-flare.html">http://john-chapman-graphics.blogspot.co.uk/2013/02/pseudo-lens-flare.html</a>
 * @author Toni Sagrista */
public final class Bias extends Filter<Bias> {
	private float bias;

	public enum Param implements Parameter {
		// @formatter:off
		Texture("u_texture0", 0), Bias("u_bias", 0);
		// @formatter:on

		private String mnemonic;
		private int elementSize;

		private Param (String mnemonic, int elementSize) {
			this.mnemonic = mnemonic;
			this.elementSize = elementSize;
		}

		@Override
		public String mnemonic () {
			return this.mnemonic;
		}

		@Override
		public int arrayElementSize () {
			return this.elementSize;
		}
	}

	public Bias () {
		super(ShaderLoader.fromFile("screenspace", "bias"));
		rebind();
	}

	public void setBias (float bias) {
		this.bias = bias;
		setParam(Param.Bias, this.bias);
	}

	public float getBias () {
		return bias;
	}

	@Override
	protected void onBeforeRender () {
		inputTexture.bind(u_texture0);
	}

	@Override
	public void rebind () {
		setParams(Param.Texture, u_texture0);
		setBias(this.bias);
	}
}