feat: add initial implementation of squidgeTemplate plugin with basic gain parameter

plugins/SquidgeTemplate/SquidgeTemplate.cpp

@@ -0,0 +1,79 @@
+#include "DistrhoDetails.hpp"
+#include "DistrhoPlugin.hpp"
+#include "DistrhoPluginInfo.h"
+
+#include "../../core/Gain.hpp"
+
+START_NAMESPACE_DISTRHO
+
+class squidgeTemplate : public Plugin
+{
+public:
+    enum Parameters
+    {
+        kParamGain,
+        kParameterCount
+    };
+
+    squidgeTemplate()
+        : Plugin(kParameterCount, 0, 0), gain_(1.0f)
+    {
+    }
+
+protected:
+    const char *getLabel() const override { return "squidgeTemplate"; }
+    const char *getDescription() const override { return "Generic squidge plugin template."; }
+    const char *getMaker() const override { return "SquidgeSoft"; }
+    const char *getLicense() const override { return "GPL3"; }
+    uint32_t getVersion() const override { return d_version(0, 1, 0); }
+    int64_t getUniqueId() const override { return d_cconst('S', 'Q', 'T', 'P'); }
+
+    void initParameter(uint32_t index, Parameter &parameter) override
+    {
+        switch (index)
+        {
+        case kParamGain:
+            parameter.name = "Gain";
+            parameter.symbol = "gain";
+            parameter.ranges.min = 0.0f;
+            parameter.ranges.def = 1.0f;
+            parameter.ranges.max = 2.0f;
+            parameter.hints = kParameterIsAutomatable;
+            break;
+        }
+    }
+
+    float getParameterValue(uint32_t index) const override
+    {
+        if (index == kParamGain)
+            return gain_.getGain();
+        return 0.0f;
+    }
+
+    void setParameterValue(uint32_t index, float value) override
+    {
+        if (index == kParamGain)
+            gain_.setGain(value);
+    }
+
+    void run(const float **inputs, float **outputs, uint32_t frames) override
+    {
+        gain_.processStereo(inputs[0], inputs[1], outputs[0], outputs[1], frames);
+    }
+
+    void sampleRateChanged(double /*newSr*/) override
+    {
+    }
+
+private:
+    Gain gain_;
+
+    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(squidgeTemplate)
+};
+
+Plugin *createPlugin()
+{
+    return new squidgeTemplate();
+}
+
+END_NAMESPACE_DISTRHO