Sepia.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016-2021 Spooky Games
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package games.spooky.gdx.gfx.demo.fx;

import games.spooky.gdx.gfx.CommonShaders;
import games.spooky.gdx.gfx.shader.OwnedSinglePassShaderEffect;

public class Sepia extends OwnedSinglePassShaderEffect {

	static final String Sepia = "\n" +
			"#ifdef GL_ES\n" +
			"precision lowp float;\n" +
			"#define MED mediump\n" +
			"#else\n" +
			"#define MED\n" +
			"#endif\n" +
			"\n" +
			"varying MED vec2 v_texCoords;\n" +
			"uniform sampler2D u_texture0;\n" +
			"\n" +
			"void main()\n" +
			"{\n" +
			"vec4 c = texture2D(u_texture0, v_texCoords);\n" +
			"gl_FragColor.r = (c.r * 0.393) + (c.g * 0.769) + (c.b * 0.189);\n" +
			"gl_FragColor.g = (c.r * 0.349) + (c.g * 0.686) + (c.b * 0.168);\n" +
			"gl_FragColor.b = (c.r * 0.272) + (c.g * 0.534) + (c.b * 0.131);\n" +
			"gl_FragColor.a = c.a;\n" +
			"}";
	
	public Sepia() {
		super(CommonShaders.Screenspace, Sepia);
	}
}