package com.sherazkhilji.videffects;

import android.opengl.GLSurfaceView;

import com.sherazkhilji.videffects.interfaces.ShaderInterface;


/**
 * Adjusts the brightness of the video.
 *
 * @author sheraz.khilji
 */
public class BrightnessEffect implements ShaderInterface {

    private float brightnessValue;

    /**
     * Initialize Effect
     *
     * @param brightnessvalue Range should be between 0.1- 2.0 with 1.0 being normal.
     */
    public BrightnessEffect(float brightnessvalue) {
        if (brightnessvalue < 0.1f)
            brightnessvalue = 0.1f;
        if (brightnessvalue > 2.0f)
            brightnessvalue = 2.0f;

        this.brightnessValue = brightnessvalue;
    }

    @Override
    public String getShader(GLSurfaceView mGlSurfaceView) {
        return "#extension GL_OES_EGL_image_external : require\n"
                + "precision mediump float;\n"
                + "uniform samplerExternalOES sTexture;\n"
                + "float brightness ;\n" + "varying vec2 vTextureCoord;\n"
                + "void main() {\n" + "  brightness =" + brightnessValue
                + ";\n"
                + "  vec4 color = texture2D(sTexture, vTextureCoord);\n"
                + "  gl_FragColor = brightness * color;\n" + "}\n";

    }
}