com.cyphercove.doublehelix.PowerLUT.java Source code

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Here is the source code for com.cyphercove.doublehelix.PowerLUT.java

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/*******************************************************************************
 * Copyright 2015 Cypher Cove, LLC
 *
 * 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.cyphercove.doublehelix;

import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.Texture.TextureWrap;
import com.badlogic.gdx.graphics.glutils.PixmapTextureData;
import com.badlogic.gdx.utils.Disposable;

public class PowerLUT implements Disposable {
    private Texture texture;

    /** W power will be in luminance, and H power will be in alpha**/
    public PowerLUT(float powerW, float intensityW, float powerH, float intensityH, int width, int height) {

        Pixmap pixmap = new Pixmap(width, height, Format.RGBA8888);
        for (int i = 0; i < width; i++) {
            float valueW = (float) Math.pow((float) i / width, powerW) * intensityW;
            for (int j = 0; j < height; j++) {
                float valueH = (float) Math.pow((float) j / height, powerH) * intensityH;
                pixmap.setColor(valueW, valueH, 1.0f, 1.0f);
                pixmap.drawPixel(i, j);
            }
        }

        PixmapTextureData data = new PixmapTextureData(pixmap, Format.RGBA8888, false, false, true);

        texture = new Texture(data);
        texture.setWrap(TextureWrap.ClampToEdge, TextureWrap.ClampToEdge);
        texture.setFilter(TextureFilter.Linear, TextureFilter.Linear);
    }

    public Texture getTexture() {
        return texture;
    }

    @Override
    public void dispose() {
        texture.dispose();
        texture = null;
    }

}