Terrarum/src/net/torvald/terrarum/UIFakeGradOverlay.kt

package net.torvald.terrarum

import com.badlogic.gdx.Gdx
import com.badlogic.gdx.graphics.Camera
import com.badlogic.gdx.graphics.Color
import com.badlogic.gdx.graphics.GL20
import com.badlogic.gdx.graphics.OrthographicCamera
import com.badlogic.gdx.graphics.g2d.SpriteBatch
import com.jme3.math.FastMath
import net.torvald.random.HQRNG
import net.torvald.terrarum.ui.Toolkit
import net.torvald.terrarum.ui.UICanvas

/**
 * Created by minjaesong on 2021-09-09.
 */
class UIFakeGradOverlay : UICanvas() {

    override var width: Int
        get() = App.scr.width
        set(value) {}

    override var height: Int
        get() = App.scr.height
        set(value) {}

    override var openCloseTime: Second = 0f

    private val tex = CommonResourcePool.getAsTexture("title_halfgrad")

    private val renderng = HQRNG()

    init {
        setAsAlwaysVisible()
    }

    override fun updateUI(delta: Float) {}
    override fun renderUI(batch: SpriteBatch, camera: Camera) {
        batch.end()
        val dither = App.getConfigBoolean("fx_dither")

        if (dither) {
            App.getCurrentDitherTex().bind(1)
            Gdx.gl.glActiveTexture(GL20.GL_TEXTURE0) // so that batch that comes next will bind any tex to it
        }


        batch.begin()

        batch.shader = null
        if (dither) {
            batch.shader.setUniformi("u_pattern", 1)
            batch.shader.setUniformi("rnd", renderng.nextInt(8192), renderng.nextInt(8192))
        }

        blendMul(batch)
        batch.draw(tex, 0f, 0f, App.scr.wf, App.scr.hf)

        blendNormalStraightAlpha(batch)
    }

    override fun doOpening(delta: Float) {}
    override fun doClosing(delta: Float) {}
    override fun endOpening(delta: Float) {}
    override fun endClosing(delta: Float) {}
    override fun dispose() {}
}

class UIFakeBlurOverlay(val blurRadius: Float, val nodarken: Boolean) : UICanvas() {

    override var width: Int
        get() = App.scr.width
        set(value) {}

    override var height: Int
        get() = App.scr.height
        set(value) {}

    override var openCloseTime: Second = OPENCLOSE_GENERIC

    private val darken = Color(0.5f, 0.5f, 0.5f, 1f)

    private val darkeningVarCol = Color(255)
    private val batchDrawCol = Color(-1)

    override fun updateUI(delta: Float) {}
    override fun renderUI(batch: SpriteBatch, camera: Camera) {
        batchDrawCol.a = openness
        batch.color = batchDrawCol
        if (App.getConfigBoolean("fx_backgroundblur")) {
            Toolkit.blurEntireScreen(batch, camera as OrthographicCamera, blurRadius * openness, 0, 0, width, height)
        }

        if (!nodarken) {
            blendMul(batch)
            darkeningVarCol.r = FastMath.interpolateLinear(openness, 1f, 0.5f)
            darkeningVarCol.g = FastMath.interpolateLinear(openness, 1f, 0.5f)
            darkeningVarCol.b = FastMath.interpolateLinear(openness, 1f, 0.5f)
            batch.color = darkeningVarCol
            Toolkit.fillArea(batch, 0, 0, width, height)

            blendNormalStraightAlpha(batch)
        }
    }

    private var openness = 0f // 0-closed, 1-opened

    override fun doOpening(delta: Float) {
        openness = handler.openCloseCounter / openCloseTime
    }

    override fun doClosing(delta: Float) {
        openness = (openCloseTime - handler.openCloseCounter) / openCloseTime
    }

    override fun endOpening(delta: Float) {
        openness = 1f
    }

    override fun endClosing(delta: Float) {
        openness = 0f
    }

    override fun dispose() {
    }
}