Add the groundwork for loading VST plugins

meson.build

@@ -44,6 +44,6 @@ executable(
   ],
   native : false,
   include_directories : include_dir,
-  link_args : []
   dependencies : [msgpack_dep],
+  link_args : []
 )

src/wine-host/vst-host.cpp

@@ -1,24 +1,59 @@
-#include <vestige/aeffect.h>
-
 #include <iostream>
 
 #include "native-includes.h"
 
 // `native-includes.h` has to be included before any other files as otherwise we
 // might get the wrong version of certain libraries
+#define WIN32_LEAN_AND_MEAN
+#include <vestige/aeffect.h>
+#include <windows.h>
+
 #include "../common/communication.h"
 
+/**
+ * A function pointer to what should be the entry point of a VST plugin.
+ */
+using VstEntryPoint = AEffect*(VST_CALL_CONV*)(audioMasterCallback);
+
+intptr_t VST_CALL_CONV
+host_callback(AEffect*, int32_t, int32_t, intptr_t, void*, float);
+
 int main() {
+    // TODO: We're going to need to forward messages both from the host to the
+    //       plugin and from the plugin to the host. It might be useful to use
+    //       two sockets here so both channels can be handled independently.
+
+    // TODO: Load the right VST plugin
+    // I sadly could not get Boost.DLL to work here, so we'll just load the VST
+    // plugisn by hand
+    const auto vst_handle = LoadLibrary(
+        "/home/robbert/.wine/drive_c/Program "
+        "Files/Steinberg/VstPlugins/Serum_x64.dll");
+
+    // TODO: Fall back to the old entry points
+    const auto vst_entry_point = reinterpret_cast<VstEntryPoint>(
+        GetProcAddress(vst_handle, "VSTPluginMain"));
+
+    // TODO: Check whether this returned a null pointer
+    AEffect* plugin = vst_entry_point(host_callback);
+
+    // TODO: Check the spec, how large should this be?
+    std::vector<char> buffer(2048, 0);
+    plugin->dispatcher(plugin, effGetEffectName, 0, 0, buffer.data(), 0.0);
+
+    std::string plugin_title(buffer.data());
+
     // TODO: The program should terminate automatically when stdin gets closed
 
-    // TODO: Remove debug
+    // TODO: Remove debug, we're just reporting the plugin's name we retrieved
+    //       above
     while (true) {
         auto event = read_object<Event>(std::cin);
 
         EventResult response;
         if (event.opcode == effGetEffectName) {
+            response.result = plugin_title;
             response.return_value = 1;
-            response.result = "Hello, world!";
         } else {
             response.return_value = 0;
         }
@@ -26,3 +61,13 @@ int main() {
         write_object(std::cout, response);
     }
 }
+
+// TODO: Placeholder
+intptr_t VST_CALL_CONV host_callback(AEffect* plugin,
+                                     int32_t opcode,
+                                     int32_t parameter,
+                                     intptr_t value,
+                                     void* result,
+                                     float option) {
+    return 1;
+}