title screen panner to track the ground better

src/net/torvald/terrarum/UIFakeGradOverlay.kt

@@ -1,7 +1,9 @@
 package net.torvald.terrarum
 
 import com.badlogic.gdx.graphics.Camera
+import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import net.torvald.terrarum.modulebasegame.IngameRenderer
 import net.torvald.terrarum.ui.UICanvas
 
 /**
@@ -38,4 +40,54 @@ class UIFakeGradOverlay : UICanvas() {
     override fun endOpening(delta: Float) {}
     override fun endClosing(delta: Float) {}
     override fun dispose() {}
+}
+
+class UIFakeBlurOverlay : 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 shaderBlur = App.loadShaderFromFile("assets/blur.vert", "assets/blur.frag")
+
+    init { }
+
+    private val blurRadius = 32f
+    private val darken = Color(0.5f, 0.5f, 0.5f, 1f)
+
+    override fun updateUI(delta: Float) {}
+    override fun renderUI(batch: SpriteBatch, camera: Camera) {
+        /*for (i in 0 until 5) {
+            batch.shader = shaderBlur
+            shaderBlur.setUniformMatrix("u_projTrans", camera.combined)
+            shaderBlur.setUniformi("u_texture", 0)
+            shaderBlur.setUniformf("iResolution", width.toFloat(), height.toFloat())
+            IngameRenderer.shaderBlur.setUniformf("flip", 1f)
+            if (i % 2 == 0)
+                IngameRenderer.shaderBlur.setUniformf("direction", blurRadius, 0f)
+            else
+                IngameRenderer.shaderBlur.setUniformf("direction", 0f, blurRadius)
+
+            batch.fillRect(0f, 0f, width.toFloat(), height.toFloat())
+        }*/
+        blendMul(batch)
+        batch.color = darken
+        batch.fillRect(0f, 0f, width.toFloat(), height.toFloat())
+
+        blendNormal(batch)
+    }
+
+    override fun doOpening(delta: Float) {}
+    override fun doClosing(delta: Float) {}
+    override fun endOpening(delta: Float) {}
+    override fun endClosing(delta: Float) {}
+    override fun dispose() {
+        shaderBlur.dispose()
+    }
 }