Add Features to PMD and have SupportsMultiplicativeMod being first (#136

)

As part of the pursuit of param local short circuit multi mode mod

include/sst/basic-blocks/params/ParamMetadata.h

@@ -192,6 +192,34 @@ struct ParamMetaData
  return res;
  }
 
+ /*
+ * Parameters have an extensible optional set of features stored in a single
+ * uint64_t which you can flag on and off. This allows us to add things we want
+ * as binaries on params without adding a squillion little bools for lesser importance
+ * information only toggles. These features are not stream-at-rest stable just
+ * stream-in-session stable by integer.
+ */
+ enum struct Features : uint64_t
+ {
+ SUPPORTS_MULTIPLICATIVE_MODULATION = 1 << 0
+ };
+ uint64_t features{0};
+ ParamMetaData withFeature(Features f) const
+ {
+ auto res = *this;
+ res.features |= (uint64_t)f;
+ return res;
+ }
+ bool hasFeature(Features f) const { return features & (uint64_t)f; }
+ ParamMetaData withSupportsMultiplicativeModulation() const
+ {
+ return withFeature(Features::SUPPORTS_MULTIPLICATIVE_MODULATION);
+ }
+ bool hasSupportsMultiplicativeModulation() const
+ {
+ return hasFeature(Features::SUPPORTS_MULTIPLICATIVE_MODULATION);
+ }
+
  /*
  * To String and From String conversion functions require information about the
  * parameter to execute. The primary driver is the value so the API takes the form
@@ -753,6 +781,8 @@ struct ParamMetaData
  // v * v * v * svA = 1
  // v = cbrt(1/svA)
  res = res.withDefault(std::cbrt(1.f / res.svA)).withQuantizedInterval(3.f);
+
+ res = res.withSupportsMultiplicativeModulation();
  return res;
  }
  ParamMetaData asLinearDecibel(float lower = -96, float upper = 12)