ColorAttribute.java

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * 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.badlogic.gdx.graphics.g3d.materials;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
import com.badlogic.gdx.utils.Pool;

public class ColorAttribute extends MaterialAttribute {

	static final public String diffuse = "diffuseColor";
	static final public String specular = "specularColor";
	static final public String emissive = "emissiveColor";
	static final public String rim = "rimColor";
	static final public String fog = "fogColor";

	public final Color color = new Color();

	protected ColorAttribute() {
	}

	/**
	 * Creates a {@link MaterialAttribute} that is a pure {@link Color}.
	 * 
	 * @param color
	 *            The {@link Color} that you wish the attribute to represent.
	 * @param name
	 *            The name of the uniform in the {@link ShaderProgram} that will have its value set to this color. (A
	 *            'name' does not matter for a game that uses {@link GL10}).
	 */
	public ColorAttribute(Color color, String name) {
		super(name);
		this.color.set(color);
	}

	@Override
	public void bind() {
		if (Gdx.gl10 == null)
			throw new RuntimeException("Can't call ColorAttribute.bind() in a GL20 context");

		// todo how about emissive or specular?
		// TODO replace string equals with something more performant
		if (diffuse.equals(diffuse))
			Gdx.gl10.glColor4f(color.r, color.g, color.b, color.a);
	}

	@Override
	public void bind(ShaderProgram program) {
		program.setUniformf(name, color.r, color.g, color.b, color.a);
	}

	@Override
	public MaterialAttribute copy() {
		return new ColorAttribute(color, name);
	}

	@Override
	public void set(MaterialAttribute attr) {
		ColorAttribute colAttr = (ColorAttribute) attr;
		name = colAttr.name;
		final Color c = colAttr.color;
		color.r = c.r;
		color.g = c.g;
		color.b = c.b;
		color.a = c.a;
	}

	private final static Pool<ColorAttribute> pool = new Pool<ColorAttribute>() {
		@Override
		protected ColorAttribute newObject() {
			return new ColorAttribute();
		}
	};

	@Override
	public MaterialAttribute pooledCopy() {
		ColorAttribute attr = pool.obtain();
		attr.set(this);
		return attr;
	}

	@Override
	public void free() {
		if (isPooled)
			pool.free(this);
	}
}