From 779af6bdaba1a3d0af578c742437a284b20f4adc Mon Sep 17 00:00:00 2001
From: zetaPRIME <qmanxt@gmail.com>
Date: Thu, 24 Mar 2022 02:27:04 -0400
Subject: [PATCH] automatable param stuff

---
 xybrid/nodelib/param.cpp  | 22 +++++++++
 xybrid/nodelib/param.h    | 96 +++++++++++++++++++++++++++++++++++++++
 xybrid/nodelib/svfilter.h |  4 ++
 3 files changed, 122 insertions(+)
 create mode 100644 xybrid/nodelib/param.cpp
 create mode 100644 xybrid/nodelib/param.h

diff --git a/xybrid/nodelib/param.cpp b/xybrid/nodelib/param.cpp
new file mode 100644
index 0000000..6c805ca
--- /dev/null
+++ b/xybrid/nodelib/param.cpp
@@ -0,0 +1,22 @@
+#include "param.h"
+
+using Xybrid::NodeLib::Param;
+using namespace Xybrid::Data;
+
+ParameterPort* Param::makePort(Data::Node* node, const QString& name) {
+    if (port) return port;
+
+    node->inputs.try_emplace(Port::Parameter);
+    auto& inp = node->inputs.find(Port::Parameter)->second;
+
+    uint8_t id = 0;
+    auto it = inp.begin();
+    while (it != inp.end() && it->first == id) { ++id; ++it; } // scan for first unused id
+
+    auto n = name;
+    if (n.isEmpty()) n = this->name.toLower();
+
+    port = static_cast<ParameterPort*>(node->addPort(Port::Input, Port::Parameter, id).get());
+    port->name = n;
+    return port;
+}
diff --git a/xybrid/nodelib/param.h b/xybrid/nodelib/param.h
new file mode 100644
index 0000000..b0205ce
--- /dev/null
+++ b/xybrid/nodelib/param.h
@@ -0,0 +1,96 @@
+#pragma once
+
+#include <cmath>
+#include <limits>
+#include <QCborMap>
+
+#include "data/node.h"
+#include "data/porttypes.h"
+
+//namespace Xybrid::Data { class ParameterPort; }
+namespace Xybrid::NodeLib {
+    /// Plugin parameter with associated metadata and automation faculties
+    class Param {
+        //
+        Param() = default;
+    public:
+        class Reader {
+            friend class Param;
+            Param* p;
+            size_t pos = 0;
+            bool r;
+            Reader(Param* p, bool r) : p(p), r(r) { }
+        public:
+            double next() {
+                if (r) {
+                    auto v = p->port->data[pos++];
+                    if (!std::isnan(v)) {
+                        if (p->min == -p->max) // "signed" logic if symmetrical around zero
+                            v = std::clamp(v, -1.0, 1.0) * p->max;
+                        else // extents 0.0 .. 1.0 scaled across parameter range
+                            v = std::clamp(p->min + v * (p->max - p->min), p->min, p->max);
+
+                        p->vt = v;
+                    }
+                }
+                if (!std::isnan(p->vt)) return p->vt;
+                return p->value;
+            }
+        };
+
+        enum Flags : uint8_t {
+            ResetOnTick = 0b00000001,
+        };
+
+        QString name;
+        double min, max, def;
+
+        double value;
+        double vt = std::numeric_limits<double>::quiet_NaN();
+
+        Flags flags;
+
+        Data::ParameterPort* port = nullptr;
+
+        Param(const QString& name, double min, double max, double def, Flags flags = {}) : Param() {
+            this->name = name;
+            this->min = min;
+            this->max = max;
+            this->def = def;
+            this->value = def;
+            this->flags = flags;
+        }
+
+        Data::ParameterPort* makePort(Data::Node*, const QString& name = { });
+
+        Reader start() {
+            bool r = port && port->isConnected();
+            if (r) port->pull();
+            if (flags & ResetOnTick) vt = std::numeric_limits<double>::quiet_NaN();
+            return Reader(this, r);
+        }
+
+        inline QString saveName() {
+            return name.toLower().remove(' ');
+        }
+
+        inline void save(QCborMap& m, QString id = { }) {
+            if (id.isEmpty()) id = saveName();
+            m[id] = value;
+        }
+
+        inline void load(QCborMap& m, QString id = { }) {
+            if (id.isEmpty()) id = saveName();
+            value = m.value(id).toDouble(value);
+            vt = std::numeric_limits<double>::quiet_NaN();
+        }
+
+        // - give it a Reader abstraction (grab from a "startTick" thing, call its next() function for tracking and values)
+        // - functions to automatically save/load from QCborMap
+        // binding a knobgadget automatically populates range+defaults(+label)
+        // - figure out how to do range stuff
+        // - "signed" extents only if min == -max
+
+        // meta info for parameter ports?
+    };
+}
diff --git a/xybrid/nodelib/svfilter.h b/xybrid/nodelib/svfilter.h
index b283cc2..695646e 100644
--- a/xybrid/nodelib/svfilter.h
+++ b/xybrid/nodelib/svfilter.h
@@ -43,6 +43,10 @@ namespace Xybrid::NodeLib {
 
     };
 
+    // explicit instantiation declarations to eliminate warnings
+    //template<> void Xybrid::NodeLib::GenericSVFilter<Data::AudioFrame>::process(Data::AudioFrame, double, double, int);
+    //template<> void Xybrid::NodeLib::GenericSVFilter<double>::process(double, double, double, int);
+
     /// 12db Chamberlin State Variable Filter
     typedef GenericSVFilter<Data::AudioFrame> SVFilter;
     /// 12db Chamberlin State Variable Filter (mono version)