package Filters;

import android.opengl.GLES20;

import com.owner.glitchee.CameraActivity;

import cn.ezandroid.ezfilter.core.FilterRender;

public class gba1 extends FilterRender {

    private static final String UNIFORM_WIDTH = "width";
    private int mWidthHandler;
    private static final String UNIFORM_HEIGHT = "height";
    private int mHeightHandler;
    private String UNIFORM_AMOUNT = "amount";
    private int mAmountHandler;
    private static float mAmount;
    private static float mUpdatedAmount = (float) 30.0;

    public gba1() {
        setFragmentShader(
                "precision mediump float;\n"+
                        "varying lowp vec2 textureCoordinate;\n"+
                        "uniform sampler2D inputImageTexture;\n"+
                        "uniform float amount;\n"+
                        "uniform float width;\n"+
                        "uniform float height;\n"+

                        "#define iResolution vec2(width,height)\n"+
                        "#define GB_RESOLUTION amount\n"+
                        "#define GB_SOURCE_ADD -0.267\n"+
                        "#define GB_SOURCE_POWER 0.5\n"+
                        "void main(){\n"+
                        "vec2 uv = textureCoordinate.xy * GB_RESOLUTION;\n"+
                        "if (uv.x <= 1. && uv.y <= 1.) {\n"+
                        "vec4 color = texture2D(inputImageTexture, uv);\n"+
                        "float gray = (color.r * 0.8 + color.g * 1.0 + color.b * 0.9) / 2.7;\n"+
                        "gray = pow(clamp(gray + GB_SOURCE_ADD, 0., 1.), GB_SOURCE_POWER);\n"+
                        "//gray = uv.x; // to test the dithering more easily\n"+
                        "gl_FragColor = vec4(gray, gray, gray, 1.);\n"+
                        "} else {\n"+
                        "gl_FragColor = vec4(0,0,0,1);\n"+
                        "}\n"+
                        "}"

        );
    }

    @Override
    protected void initShaderHandles() {
        super.initShaderHandles();
        mAmountHandler = GLES20.glGetUniformLocation(mProgramHandle, UNIFORM_AMOUNT);
        mWidthHandler = GLES20.glGetUniformLocation(mProgramHandle, UNIFORM_WIDTH);
        mHeightHandler = GLES20.glGetUniformLocation(mProgramHandle, UNIFORM_HEIGHT);
    }

    @Override
    protected void bindShaderValues() {
        super.bindShaderValues();
        GLES20.glUniform1f(mAmountHandler, mAmount);
        GLES20.glUniform1f(mWidthHandler, CameraActivity.mRenderPipeline.getWidth());
        GLES20.glUniform1f(mHeightHandler, CameraActivity.mRenderPipeline.getHeight());
    }

    @Override
    protected void onDraw() {
        super.onDraw();
        mAmount = mUpdatedAmount;
    }

    public static void setAmount(float amount){
        mUpdatedAmount = (amount);
    }

}