fixed a "bug" that assumed the framerates are normally distributed

src/net/torvald/terrarum/App.java

@@ -1078,6 +1078,10 @@ public class App implements ApplicationListener {
         screenshotRequested = true;
     }
 
+    public static boolean isScreenshotRequested() {
+        return screenshotRequested;
+    }
+
     // DEFAULT DIRECTORIES //
 
     public static String OSName = System.getProperty("os.name");

src/net/torvald/terrarum/DefaultConfig.kt

@@ -112,7 +112,8 @@ object DefaultConfig {
 
             "fx_newlight" to false,
 
-            "debug_key_deltat_benchmark" to Input.Keys.SLASH
+            "debug_key_deltat_benchmark" to Input.Keys.SLASH,
+            "debug_deltat_benchmark_sample_sizes" to 2048,
 
 
 

src/net/torvald/terrarum/IngameInstance.kt

@@ -79,7 +79,7 @@ open class IngameInstance(val batch: FlippingSpriteBatch, val isMultiplayer: Boo
     open var uiTooltip: UITooltip = UITooltip()
     open var notifier: Notification = Notification()
 
-    val deltaTeeBenchmarks = CircularArray<Float>(1024, true)
+    val deltaTeeBenchmarks = CircularArray<Float>(App.getConfigInt("debug_deltat_benchmark_sample_sizes"), true)
 
     init {
         consoleHandler.setPosition(0, 0)

src/net/torvald/terrarum/TerrarumPostProcessor.kt

@@ -7,6 +7,7 @@ import com.badlogic.gdx.graphics.glutils.FrameBuffer
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer
 import com.badlogic.gdx.math.Matrix4
 import com.badlogic.gdx.utils.Disposable
+import com.jme3.math.FastMath
 import net.torvald.random.HQRNG
 import net.torvald.terrarum.gamecontroller.KeyToggler
 import net.torvald.terrarum.ui.BasicDebugInfoWindow
@@ -162,12 +163,20 @@ object TerrarumPostProcessor : Disposable {
                             "ΔF: Gathering data (${INGAME.deltaTeeBenchmarks.elemCount}/${INGAME.deltaTeeBenchmarks.size})"
                         }
                         else {
-                            val tallies = INGAME.deltaTeeBenchmarks.toList()
+                            val tallies = INGAME.deltaTeeBenchmarks.toList().sorted()
                             val average = tallies.average()
-                            val stdev = (tallies.sumOf { (it - average).sqr() } / tallies.size).sqrt()
-                            val low5 = average + stdev * -1.64
-                            val low1 = average + stdev * -2.33
-                            "ΔF: Avr ${average.format(1)}; 95% ${low5.format(1)}; 99% ${low1.format(1)}; σ ${stdev.format(1)}"
+
+                            val halfPos = 0.5f * INGAME.deltaTeeBenchmarks.size
+                            val halfInd = halfPos.floorInt()
+                            val low5pos = 0.05f * INGAME.deltaTeeBenchmarks.size
+                            val low5ind = low5pos.floorInt()
+                            val low1pos = 0.01f * INGAME.deltaTeeBenchmarks.size
+                            val low1ind = low1pos.floorInt()
+
+                            val median = FastMath.interpolateLinear(halfPos - halfInd, tallies[halfInd], tallies[halfInd + 1])
+                            val low5 = FastMath.interpolateLinear(low5pos - low5ind, tallies[low5ind], tallies[low5ind + 1])
+                            val low1 = FastMath.interpolateLinear(low1pos - low1ind, tallies[low1ind], tallies[low1ind + 1])
+                            "ΔF: Avr ${average.format(1)}; Med ${median.format(1)}; 5% ${low5.format(1)}; 1% ${low1.format(1)}"
                         }
                         val tw = App.fontGame.getWidth(benchstr)
                         App.fontGame.draw(it, benchstr, Toolkit.drawWidth - tw - 5f, App.scr.height - 24f)
@@ -181,6 +190,7 @@ object TerrarumPostProcessor : Disposable {
     private val rng = HQRNG()
 
     private fun Double.format(digits: Int) = "%.${digits}f".format(this)
+    private fun Float.format(digits: Int) = "%.${digits}f".format(this)
 
     private val swizzler = intArrayOf(
             1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1,

src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt

@@ -11,8 +11,7 @@ import com.badlogic.gdx.utils.Disposable
 import com.badlogic.gdx.utils.GdxRuntimeException
 import net.torvald.random.HQRNG
 import net.torvald.terrarum.*
-import net.torvald.terrarum.App.*
-import net.torvald.terrarum.Terrarum.ingame
+import net.torvald.terrarum.App.measureDebugTime
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZEF
 import net.torvald.terrarum.gameactors.ActorWithBody
@@ -222,7 +221,7 @@ object IngameRenderer : Disposable {
         this.player = player
 
 
-        if (!gamePaused || newWorldLoadedLatch) {
+        if ((!gamePaused && !App.isScreenshotRequested()) || newWorldLoadedLatch) {
             measureDebugTime("Renderer.LightRun*") {
                 // recalculate for even frames, or if the sign of the cam-x changed
                 if (App.GLOBAL_RENDER_TIMER % 3 == 0 || Math.abs(WorldCamera.x - oldCamX) >= world.width * 0.85f * TILE_SIZEF || newWorldLoadedLatch) {

src/net/torvald/terrarum/modulebasegame/TerrarumIngame.kt

@@ -742,6 +742,8 @@ open class TerrarumIngame(batch: FlippingSpriteBatch) : IngameInstance(batch) {
     private var oldCamX = 0
     private var oldPlayerX = 0.0
 
+    private var deltaTeeCleared = false
+
     /**
      * Ingame (world) related updates; UI update must go to renderGame()
      */
@@ -756,7 +758,7 @@ open class TerrarumIngame(batch: FlippingSpriteBatch) : IngameInstance(batch) {
         // will also queue up the block/wall/wire placed events
         ingameController.update()
 
-        if (!paused || newWorldLoadedLatch) {
+        if ((!paused && !App.isScreenshotRequested()) || newWorldLoadedLatch) {
 
             //hypothetical_input_capturing_function_if_you_finally_decided_to_forgo_gdx_input_processor_and_implement_your_own_to_synchronise_everything()
 
@@ -822,11 +824,17 @@ open class TerrarumIngame(batch: FlippingSpriteBatch) : IngameInstance(batch) {
 
             if (KeyToggler.isOn(App.getConfigInt("debug_key_deltat_benchmark"))) {
                 deltaTeeBenchmarks.appendHead(1f / Gdx.graphics.deltaTime)
+
+                if (deltaTeeCleared) deltaTeeCleared = false
+            }
+            else if (!deltaTeeCleared) {
+                deltaTeeCleared = true
+                deltaTeeBenchmarks.clear()
             }
         }
 
 
-        if (!paused || newWorldLoadedLatch) {
+        if ((!paused && !App.isScreenshotRequested()) || newWorldLoadedLatch) {
             // completely consume block change queues because why not
             terrainChangeQueue.clear()
             wallChangeQueue.clear()
@@ -858,7 +866,7 @@ open class TerrarumIngame(batch: FlippingSpriteBatch) : IngameInstance(batch) {
 
         //println("paused = $paused")
 
-        if (!paused && newWorldLoadedLatch) newWorldLoadedLatch = false
+        if ((!paused && !App.isScreenshotRequested()) && newWorldLoadedLatch) newWorldLoadedLatch = false
     }