[Input] Dynamically link to XInput.

4 files changed, 76 insertions, 19 deletions

diff --git a/src/xenia/app/xenia_main.cc b/src/xenia/app/xenia_main.cc
index ee474485b..827584af0 100644
--- a/src/xenia/app/xenia_main.cc
+++ b/src/xenia/app/xenia_main.cc
@@ -119,11 +119,18 @@ std::vector<std::unique_ptr<hid::InputDriver>> CreateInputDrivers(
       drivers.emplace_back(std::move(winkey_driver));
     }
 #endif  // XE_PLATFORM_WIN32
-    if (drivers.empty()) {
-      // Fallback to nop if none created.
-      drivers.emplace_back(xe::hid::nop::Create(window));
+  }
+  for (auto it = drivers.begin(); it != drivers.end();) {
+    if (XFAILED((*it)->Setup())) {
+      it = drivers.erase(it);
+    } else {
+      ++it;
     }
   }
+  if (drivers.empty()) {
+    // Fallback to nop if none created.
+    drivers.emplace_back(xe::hid::nop::Create(window));
+  }
   return drivers;
 }
 
diff --git a/src/xenia/hid/xinput/xinput_input_driver.cc b/src/xenia/hid/xinput/xinput_input_driver.cc
index 937b66801..9e6d2f90c 100644
--- a/src/xenia/hid/xinput/xinput_input_driver.cc
+++ b/src/xenia/hid/xinput/xinput_input_driver.cc
@@ -21,26 +21,64 @@ namespace hid {
 namespace xinput {
 
 XInputInputDriver::XInputInputDriver(xe::ui::Window* window)
-    : InputDriver(window) {
-#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8 && _WIN32_WINNT < _WIN32_WINNT_WIN10)
-  // TODO(gibbed): Is this necessary?
-  XInputEnable(TRUE);
-#endif
-}
+    : InputDriver(window),
+      module_(nullptr),
+      XInputGetCapabilities_(nullptr),
+      XInputGetState_(nullptr),
+      XInputGetKeystroke_(nullptr),
+      XInputSetState_(nullptr),
+      XInputEnable_(nullptr) {}
 
 XInputInputDriver::~XInputInputDriver() {
-#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8 && _WIN32_WINNT < _WIN32_WINNT_WIN10)
-  // TODO(gibbed): Is this necessary?
-  XInputEnable(FALSE);
-#endif
+  if (module_) {
+    FreeLibrary((HMODULE)module_);
+    module_ = nullptr;
+    XInputGetCapabilities_ = nullptr;
+    XInputGetState_ = nullptr;
+    XInputGetKeystroke_ = nullptr;
+    XInputSetState_ = nullptr;
+    XInputEnable_ = nullptr;
+  }
 }
 
-X_STATUS XInputInputDriver::Setup() { return X_STATUS_SUCCESS; }
+X_STATUS XInputInputDriver::Setup() {
+  HMODULE module = LoadLibraryW(L"xinput1_4.dll");
+  if (!module) {
+    module = LoadLibraryW(L"xinput1_3.dll");
+  }
+  if (!module) {
+    return X_STATUS_DLL_NOT_FOUND;
+  }
+
+  // Required.
+  auto xigc = GetProcAddress(module, "XInputGetCapabilities");
+  auto xigs = GetProcAddress(module, "XInputGetState");
+  auto xigk = GetProcAddress(module, "XInputGetKeystroke");
+  auto xiss = GetProcAddress(module, "XInputSetState");
+
+  // Not required.
+  auto xie = GetProcAddress(module, "XInputEnable");
+
+  // Only fail when we don't have the bare essentials;
+  if (!xigc || !xigs || !xigk || !xiss) {
+    FreeLibrary(module);
+    return X_STATUS_PROCEDURE_NOT_FOUND;
+  }
+
+  module_ = module;
+  XInputGetCapabilities_ = xigc;
+  XInputGetState_ = xigs;
+  XInputGetKeystroke_ = xigk;
+  XInputSetState_ = xiss;
+  XInputEnable_ = xie;
+  return X_STATUS_SUCCESS;
+}
 
 X_RESULT XInputInputDriver::GetCapabilities(uint32_t user_index, uint32_t flags,
                                             X_INPUT_CAPABILITIES* out_caps) {
   XINPUT_CAPABILITIES native_caps;
-  DWORD result = XInputGetCapabilities(user_index, flags, &native_caps);
+  auto xigc = (decltype(&XInputGetCapabilities))XInputGetCapabilities_;
+  DWORD result = xigc(user_index, flags, &native_caps);
   if (result) {
     return result;
   }
@@ -65,7 +103,8 @@ X_RESULT XInputInputDriver::GetCapabilities(uint32_t user_index, uint32_t flags,
 X_RESULT XInputInputDriver::GetState(uint32_t user_index,
                                      X_INPUT_STATE* out_state) {
   XINPUT_STATE native_state;
-  DWORD result = XInputGetState(user_index, &native_state);
+  auto xigs = (decltype(&XInputGetState))XInputGetState_;
+  DWORD result = xigs(user_index, &native_state);
   if (result) {
     return result;
   }
@@ -87,7 +126,8 @@ X_RESULT XInputInputDriver::SetState(uint32_t user_index,
   XINPUT_VIBRATION native_vibration;
   native_vibration.wLeftMotorSpeed = vibration->left_motor_speed;
   native_vibration.wRightMotorSpeed = vibration->right_motor_speed;
-  DWORD result = XInputSetState(user_index, &native_vibration);
+  auto xiss = (decltype(&XInputSetState))XInputSetState_;
+  DWORD result = xiss(user_index, &native_vibration);
   return result;
 }
 
@@ -104,13 +144,15 @@ X_RESULT XInputInputDriver::GetKeystroke(uint32_t user_index, uint32_t flags,
   // So we first check if the device is connected via XInputGetCapabilities, so
   // we are not passing back an uninitialized X_INPUT_KEYSTROKE structure:
   XINPUT_CAPABILITIES caps;
-  result = XInputGetCapabilities(user_index, 0, &caps);
+  auto xigc = (decltype(&XInputGetCapabilities))XInputGetCapabilities_;
+  result = xigc(user_index, 0, &caps);
   if (result) {
     return result;
   }
 
   XINPUT_KEYSTROKE native_keystroke;
-  result = XInputGetKeystroke(user_index, 0, &native_keystroke);
+  auto xigk = (decltype(&XInputGetKeystroke))XInputGetKeystroke_;
+  result = xigk(user_index, 0, &native_keystroke);
   if (result) {
     return result;
   }
diff --git a/src/xenia/hid/xinput/xinput_input_driver.h b/src/xenia/hid/xinput/xinput_input_driver.h
index fbf75c422..dcde26197 100644
--- a/src/xenia/hid/xinput/xinput_input_driver.h
+++ b/src/xenia/hid/xinput/xinput_input_driver.h
@@ -31,6 +31,12 @@ class XInputInputDriver : public InputDriver {
                         X_INPUT_KEYSTROKE* out_keystroke) override;
 
  protected:
+  void* module_;
+  void* XInputGetCapabilities_;
+  void* XInputGetState_;
+  void* XInputGetKeystroke_;
+  void* XInputSetState_;
+  void* XInputEnable_;
 };
 
 }  // namespace xinput
diff --git a/src/xenia/xbox.h b/src/xenia/xbox.h
index a98edd24a..4884c260e 100644
--- a/src/xenia/xbox.h
+++ b/src/xenia/xbox.h
@@ -60,6 +60,7 @@ typedef uint32_t X_STATUS;
 #define X_STATUS_OBJECT_NAME_COLLISION                  ((X_STATUS)0xC0000035L)
 #define X_STATUS_INVALID_PAGE_PROTECTION                ((X_STATUS)0xC0000045L)
 #define X_STATUS_MUTANT_NOT_OWNED                       ((X_STATUS)0xC0000046L)
+#define X_STATUS_PROCEDURE_NOT_FOUND                    ((X_STATUS)0xC000007AL)
 #define X_STATUS_INSUFFICIENT_RESOURCES                 ((X_STATUS)0xC000009AL)
 #define X_STATUS_MEMORY_NOT_ALLOCATED                   ((X_STATUS)0xC00000A0L)
 #define X_STATUS_NOT_SUPPORTED                          ((X_STATUS)0xC00000BBL)
@@ -67,6 +68,7 @@ typedef uint32_t X_STATUS;
 #define X_STATUS_INVALID_PARAMETER_2                    ((X_STATUS)0xC00000F0L)
 #define X_STATUS_INVALID_PARAMETER_3                    ((X_STATUS)0xC00000F1L)
 #define X_STATUS_DLL_NOT_FOUND                          ((X_STATUS)0xC0000135L)
+#define X_STATUS_ENTRYPOINT_NOT_FOUND                   ((X_STATUS)0xC0000139L)
 #define X_STATUS_MAPPED_ALIGNMENT                       ((X_STATUS)0xC0000220L)
 #define X_STATUS_NOT_FOUND                              ((X_STATUS)0xC0000225L)
 #define X_STATUS_DRIVER_ORDINAL_NOT_FOUND               ((X_STATUS)0xC0000262L)