Fix Drawlist::Clear / Add HashID / FNV Type traits

include/pd/core/hashid.hpp

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <pd/core/fnv.hpp>
+#include <pd/core/strings.hpp>
+
+namespace PD {
+template <typename T>
+class HashID {
+ public:
+  using __Type = T;
+
+  constexpr HashID() {};
+  constexpr HashID(T id) { pID = id; }
+  HashID(const std::string& name) {
+    pID = Detail::FNV1A<T>::Hash(name);
+#ifdef PD_HASHID_KEEP_STR
+    pName = name;
+#endif
+  }
+  constexpr HashID(const char* name) {
+    pID = Detail::FNV1A<T>::Hash(std::string_view(name));
+#ifdef PD_HASHID_KEEP_STR
+    pName = name;
+#endif
+  }
+  ~HashID() {}
+
+  constexpr T Get() { return pID; }
+
+  std::string GetName() const {
+#ifdef PD_HASHID_KEEP_STR
+    return pName;
+#else
+    return std::format("hash({:#08x})", pID);
+#endif
+  }
+
+  operator T() const { return pID; }
+  // operator std::string() const { return GetName(); }
+
+ private:
+  T pID;
+#ifdef PD_HASHID_KEEP_STR
+  str pName;
+#endif
+};
+
+using HashID32 = HashID<u32>;
+using HashID64 = HashID<u64>;
+}  // namespace PD