Add scratch memory

free-audio · Jan 17, 2025 · 388d5a8 · 388d5a8
1 parent 8ec6d4e
commit 388d5a8
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Showing 2 changed files with 42 additions and 1 deletion.
diff --git a/include/clap/helpers/host-proxy.hh b/include/clap/helpers/host-proxy.hh
@@ -199,6 +199,14 @@ namespace clap { namespace helpers {
       void undoRequestRedo() const noexcept;
       void undoSetWantsContextUpdates(bool is_subscribed) const noexcept;
 
+      //////////////////////////////
+      // clap_host_scratch_memory //
+      //////////////////////////////
+      bool canUseScratchMemory() const noexcept;
+      bool scratchMemoryReserve(uint32_t scratch_size_bytes,
+                                uint32_t max_concurrency_hint) const noexcept;
+      void *scratchMemoryAccess() const noexcept;
+
    protected:
       void ensureMainThread(const char *method) const noexcept;
       void ensureAudioThread(const char *method) const noexcept;
@@ -226,5 +234,6 @@ namespace clap { namespace helpers {
       const clap_host_context_menu *_hostContextMenu = nullptr;
       const clap_host_preset_load *_hostPresetLoad = nullptr;
       const clap_host_undo *_hostUndo = nullptr;
+      const clap_host_scratch_memory *_hostScratchMemory = nullptr;
    };
 }} // namespace clap::helpers
diff --git a/include/clap/helpers/host-proxy.hxx b/include/clap/helpers/host-proxy.hxx
@@ -41,6 +41,7 @@ namespace clap { namespace helpers {
       if (!_hostPresetLoad)
          getExtension(_hostPresetLoad, CLAP_EXT_PRESET_LOAD);
       getExtension(_hostUndo, CLAP_EXT_UNDO);
+      getExtension(_hostScratchMemory, CLAP_EXT_SCRATCH_MEMORY);
    }
 
    template <MisbehaviourHandler h, CheckingLevel l>
@@ -693,7 +694,8 @@ namespace clap { namespace helpers {
          return false;
 
       if (_hostUndo->begin_change && _hostUndo->cancel_change && _hostUndo->change_made &&
-          _hostUndo->request_undo && _hostUndo->request_redo && _hostUndo->set_wants_context_updates)
+          _hostUndo->request_undo && _hostUndo->request_redo &&
+          _hostUndo->set_wants_context_updates)
          return true;
 
       return false;
@@ -744,4 +746,34 @@ namespace clap { namespace helpers {
       _hostUndo->set_wants_context_updates(_host, is_subscribed);
    }
 
+   //////////////////////////////
+   // clap_host_scratch_memory //
+   //////////////////////////////
+   template <MisbehaviourHandler h, CheckingLevel l>
+   bool HostProxy<h, l>::canUseScratchMemory() const noexcept {
+      if (!_hostScratchMemory)
+         return false;
+
+      if (_hostScratchMemory->reserve && _hostScratchMemory->access)
+         return true;
+
+      hostMisbehaving("clap_host_scratch_memory is partially implemented!");
+      return false;
+   }
+
+   template <MisbehaviourHandler h, CheckingLevel l>
+   bool HostProxy<h, l>::scratchMemoryReserve(uint32_t scratch_size_bytes,
+                                              uint32_t max_concurrency_hint) const noexcept {
+      assert(canUseScratchMemory());
+      ensureMainThread("scratch_memory.reserve");
+      return _hostScratchMemory->reserve(_host, scratch_size_bytes, max_concurrency_hint);
+   }
+
+   template <MisbehaviourHandler h, CheckingLevel l>
+   void *HostProxy<h, l>::scratchMemoryAccess() const noexcept {
+      assert(canUseScratchMemory());
+      ensureAudioThread("scratch_memory.access");
+      return _hostScratchMemory->access(_host);
+   }
+
 }} // namespace clap::helpers