more interesting splash screen wip

src/net/torvald/terrarum/SplashScreen.kt

@@ -0,0 +1,63 @@
+package net.torvald.terrarum
+
+import com.badlogic.gdx.graphics.Color
+import com.badlogic.gdx.graphics.OrthographicCamera
+import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import net.torvald.terrarum.ui.Toolkit
+import net.torvald.terrarum.ui.UICanvas
+import net.torvald.terrarum.ui.UIItemHorzSlider
+
+/**
+ * Draws the loading bar and subtitle on the cold-boot splash screen.
+ * Called from App.drawSplash() (Java static context) on the GL thread.
+ *
+ * Created by minjaesong on 2026-04-06.
+ */
+object SplashScreen {
+
+    private val stubParent = object : UICanvas() {
+        override var width = 0
+        override var height = 0
+        override fun updateImpl(delta: Float) {}
+        override fun renderImpl(frameDelta: Float, batch: SpriteBatch, camera: OrthographicCamera) {}
+        override fun dispose() {}
+    }
+
+    private var loadingBar: UIItemHorzSlider? = null
+    private var lastBarWidth = 0
+
+    private val subtitleCol = Color(0.75f, 0.75f, 0.75f, 1f)
+
+    @JvmStatic
+    fun render(batch: SpriteBatch, camera: OrthographicCamera) {
+        val progress = CommonResourcePool.loadingProgress
+        val barWidth = (Toolkit.drawWidth * 0.4f).toInt().coerceAtLeast(200)
+        val barX = (Toolkit.drawWidth - barWidth) / 2
+        val barY = App.scr.height - 48
+
+        if (loadingBar == null || lastBarWidth != barWidth) {
+            lastBarWidth = barWidth
+            loadingBar = UIItemHorzSlider(stubParent, barX, barY, 0.0, 0.0, 1.0, barWidth).also {
+                it.suppressHaptic = true
+                it.isEnabled = false
+            }
+        }
+
+        val bar = loadingBar ?: return
+        bar.posX = barX
+        bar.posY = barY
+        bar.handleWidth = (progress * barWidth).toInt().coerceIn(12, barWidth)
+
+        val subtitle = "${App.GAME_NAME}  ${App.getVERSION_STRING()}"
+        val subtitleW = App.fontGame.getWidth(subtitle)
+        val subtitleX = (Toolkit.drawWidth - subtitleW) / 2f
+        val subtitleY = (barY - 20).toFloat() // leave gap above the bar
+
+        batch.begin()
+        batch.color = subtitleCol
+        App.fontGame.draw(batch, subtitle, subtitleX, subtitleY)
+        batch.color = Color.WHITE
+        bar.render(0f, batch, camera)
+        batch.end()
+    }
+}