From bb9b7d23a1ca8e2afa8c8636d7312adc700d9a34 Mon Sep 17 00:00:00 2001
From: Andreas Grois <andi@grois.info>
Date: Thu, 15 Mar 2018 22:34:52 +0100
Subject: Fix endless loop in shader and make framerate adaptive

It seems forcing points outside the cardioid and bulb with a bad random
generator can take really long...
Also, now framerate adjusts based on time it takes to render frames.
---
 BuddhaTest/include/Helpers.h | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'BuddhaTest/include')

diff --git a/BuddhaTest/include/Helpers.h b/BuddhaTest/include/Helpers.h
index fc63103..76f790b 100644
--- a/BuddhaTest/include/Helpers.h
+++ b/BuddhaTest/include/Helpers.h
@@ -46,7 +46,7 @@ namespace Helpers
         unsigned int globalWorkGroupSizeY = 1;
         unsigned int globalWorkGroupSizeZ = 1;
 
-        unsigned int iterationsPerFrame = 10;
+        unsigned int targetFrameRate = 60;
 
         std::string pngFilename = "";
         double pngGamma = 1.0;
@@ -57,4 +57,28 @@ namespace Helpers
         bool CheckValidity();
         bool ParseCommandLine(int argc, char * argv[]);
     };
+
+    template<typename ValueType, typename TimeType>
+    class PIDController
+    {
+    public:
+        PIDController(ValueType prop, ValueType diff, ValueType integral) : propFactor(prop), diffFactor(diff), intFactor(integral) {}
+
+        ValueType Update(TimeType dT, ValueType Error)
+        {
+            errorSum += Error * dT;
+            const auto differential{(Error - lastError)/dT};
+            lastError = Error;
+            return Error * propFactor + errorSum * intFactor + differential * diffFactor;
+        }
+
+    protected:
+        ValueType propFactor{};
+        ValueType diffFactor{};
+        ValueType intFactor{};
+
+    private:
+        ValueType errorSum{};
+        ValueType lastError{};
+    };
 }
-- 
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