From 1a5ed92c14311c22e0758485e77c1acb75498edb Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Wed, 7 Nov 2018 17:05:28 -0500
Subject: [PATCH] Regeneration on ever 'n' now, but it gets scheduled on every
 frame in that semaphore group

---
 Terrain2/Renderer.swift | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Terrain2/Renderer.swift b/Terrain2/Renderer.swift
index 5cbcd72..8f9796c 100644
--- a/Terrain2/Renderer.swift
+++ b/Terrain2/Renderer.swift
@@ -170,10 +170,13 @@ class Renderer: NSObject, MTKViewDelegate {
         _ = inFlightSemaphore.wait(timeout: DispatchTime.distantFuture)
         
         if let commandBuffer = commandQueue.makeCommandBuffer() {
-            let semaphore = inFlightSemaphore
+            var didScheduleAlgorithmIteration = false
+            let inFlightSem = self.inFlightSemaphore
             commandBuffer.addCompletedHandler { (_ commandBuffer)-> Swift.Void in
-                self.iterateTerrainAlgorithm = false
-                semaphore.signal()
+                if didScheduleAlgorithmIteration && self.iterateTerrainAlgorithm {
+                    self.iterateTerrainAlgorithm = false
+                }
+                inFlightSem.signal()
             }
             
             self.updateDynamicBufferState()
@@ -187,6 +190,7 @@ class Renderer: NSObject, MTKViewDelegate {
                 terrain.algorithm.encode(in: computeEncoder)
                 computeEncoder.popDebugGroup()
                 computeEncoder.endEncoding()
+                didScheduleAlgorithmIteration = true
             }
             
             /// Delay getting the currentRenderPassDescriptor until we absolutely need it to avoid