From e9df863e462c2b3fee1501e8f31416ad259de6c9 Mon Sep 17 00:00:00 2001
From: jd-13 <jackd8989@gmail.com>
Date: Sun, 28 Jan 2024 15:36:52 +0000
Subject: [PATCH] Make TPTSVFilter cloneable

---
 WECore/WEFilters/TPTSVFilter.h              | 19 +++++++-
 WECore/WEFilters/Tests/TPTSVFilterTests.cpp | 48 +++++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/WECore/WEFilters/TPTSVFilter.h b/WECore/WEFilters/TPTSVFilter.h
index 84abb6b9..6c2d8abc 100644
--- a/WECore/WEFilters/TPTSVFilter.h
+++ b/WECore/WEFilters/TPTSVFilter.h
@@ -53,7 +53,6 @@ namespace WECore::TPTSVF {
             _calculateCoefficients();
         }
 
-        TPTSVFilter(const TPTSVFilter& other) = default;
         virtual ~TPTSVFilter() = default;
 
         /**
@@ -95,6 +94,10 @@ namespace WECore::TPTSVF {
 
         /** @} */
 
+        TPTSVFilter clone() const {
+            return TPTSVFilter(*this);
+        }
+
     private:
         double  _sampleRate,
                 _cutoffHz,
@@ -109,6 +112,20 @@ namespace WECore::TPTSVF {
         int _mode;
 
         void _calculateCoefficients();
+
+        TPTSVFilter(const TPTSVFilter& other) {
+            _sampleRate = other._sampleRate;
+            _cutoffHz = other._cutoffHz;
+            _q = other._q;
+            _gain = other._gain;
+
+            _s1 = other._s1;
+            _s2 = other._s2;
+            _g = other._g;
+            _h = other._h;
+
+            _mode = other._mode;
+        }
     };
 
     template <typename T>
diff --git a/WECore/WEFilters/Tests/TPTSVFilterTests.cpp b/WECore/WEFilters/Tests/TPTSVFilterTests.cpp
index 5f1ae14f..b12bc9b2 100644
--- a/WECore/WEFilters/Tests/TPTSVFilterTests.cpp
+++ b/WECore/WEFilters/Tests/TPTSVFilterTests.cpp
@@ -105,3 +105,51 @@ SCENARIO("TPTSVFilter: Silence in = silence out") {
         }
     }
 }
+
+SCENARIO("TPTSVFilter: Clone works correctly") {
+    GIVEN("A TPTSVFilter and a buffer of samples") {
+        auto generateBuffer = []() {
+            std::vector<double> buffer(1024);
+            std::fill(buffer.begin(), buffer.end(), 0);
+            std::fill(buffer.begin() + 300, buffer.end(), 0.5);
+            std::fill(buffer.begin() + 600, buffer.end(), 0.7);
+            return buffer;
+        };
+
+        std::vector<double> initialBuffer = generateBuffer();
+        WECore::TPTSVF::TPTSVFilter<double> filter;
+
+        // Set some unique values so we can test for them later
+        filter.setMode(WECore::TPTSVF::Parameters::FILTER_MODE.HIGHPASS);
+        filter.setCutoff(1001);
+        filter.setQ(1.1);
+        filter.setGain(0.8);
+        filter.setSampleRate(48000);
+
+        // Set up some internal state
+        filter.processBlock(&initialBuffer[0], initialBuffer.size());
+
+        WHEN("It is cloned") {
+            WECore::TPTSVF::TPTSVFilter<double> clonedFilter = filter.clone();
+
+            THEN("The cloned filter is equal to the original") {
+                CHECK(clonedFilter.getMode() == filter.getMode());
+                CHECK(clonedFilter.getCutoff() == Approx(filter.getCutoff()));
+                CHECK(clonedFilter.getQ() == Approx(filter.getQ()));
+                CHECK(clonedFilter.getGain() == Approx(filter.getGain()));
+                // CHECK(clonedFilter.getSampleRate() == Approx(filter.getSampleRate()));
+
+                // Check internal state
+                std::vector<double> buffer1 = generateBuffer();
+                filter.processBlock(&buffer1[0], buffer1.size());
+
+                std::vector<double> buffer2 = generateBuffer();
+                clonedFilter.processBlock(&buffer2[0], buffer2.size());
+
+                for (int index {0}; index < buffer.size(); index++) {
+                    CHECK(buffer1[index] == Approx(buffer2[index]));
+                }
+            }
+        }
+    }
+}