logic/dinput: only ever use a single handle to DIRECTINPUT8 COM object

1 files changed, 48 insertions, 0 deletions

diff --git a/opentrack-logic/dinput.cpp b/opentrack-logic/dinput.cpp
new file mode 100644
index 00000000..4958e862
--- /dev/null
+++ b/opentrack-logic/dinput.cpp
@@ -0,0 +1,48 @@
+#ifdef _WIN32
+
+#include "dinput.hpp"
+#include <QDebug>
+
+dinput_handle dinput_handle::self;
+
+dinput_handle::dinput_handle() : handle(init_di())
+{
+}
+
+dinput_handle::~dinput_handle()
+{
+    if (handle)
+    {
+        handle->Release();
+        handle = nullptr;
+    }
+}
+
+dinput_handle::di_t dinput_handle::init_di()
+{
+    HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
+    if (FAILED(hr))
+        qDebug() << "dinput: failed CoInitializeEx" << hr << GetLastError();
+
+    static LPDIRECTINPUT8 di_ = nullptr;
+    if (di_ == nullptr)
+    {
+        if (SUCCEEDED(DirectInput8Create(GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (void**)&di_, NULL)))
+        {
+            qDebug() << "made dinput8 handle";
+            return di_;
+        }
+        else
+        {
+            return di_ = nullptr;
+        }
+    }
+    return di_;
+}
+
+dinput_handle::di_t dinput_handle::make_di()
+{
+    return self.handle;
+}
+
+#endif