ImGuiManager: Read pointer state directly from InputManager

No need to queue to the video thread for movement.

src/util/imgui_manager.cpp

@@ -551,6 +551,8 @@ void ImGuiManager::NewFrame(u64 current_time)
 {
   ImGuiIO& io = ImGui::GetIO();
   io.DeltaTime = static_cast<float>(Timer::ConvertValueToSeconds(current_time - s_state.last_render_time));
+  std::tie(s_state.imgui_context->IO.MousePos.x, s_state.imgui_context->IO.MousePos.y) =
+    InputManager::GetPointerAbsolutePosition(0);
   s_state.last_render_time = current_time;
 
   if (s_state.scale_changed)
@@ -1589,20 +1591,6 @@ void ImGuiManager::AddTextInput(std::string str)
   });
 }
 
-void ImGuiManager::UpdateMousePosition(float x, float y)
-{
-  if (!s_state.imgui_context)
-    return;
-
-  VideoThread::RunOnThread([x, y]() {
-    if (!s_state.imgui_context) [[unlikely]]
-      return;
-
-    s_state.imgui_context->IO.MousePos.x = x;
-    s_state.imgui_context->IO.MousePos.y = y;
-  });
-}
-
 void ImGuiManager::SetCommonIOOptions(ImGuiIO& io, ImGuiPlatformIO& pio)
 {
   io.KeyRepeatDelay = 0.5f;

src/util/imgui_manager.h

@@ -179,9 +179,6 @@ bool WantsMouseInput();
 /// Called on the UI or CPU thread in response to a key press. String is UTF-8.
 void AddTextInput(std::string str);
 
-/// Called on the UI or CPU thread in response to mouse movement.
-void UpdateMousePosition(float x, float y);
-
 /// Called on the CPU thread in response to a mouse button press.
 /// Returns true if ImGui intercepted the event, and regular handlers should not execute.
 bool ProcessPointerButtonEvent(InputBindingKey key, float value);

src/util/input_manager.cpp

@@ -1530,9 +1530,6 @@ void InputManager::UpdatePointerAbsolutePosition(u32 index, float x, float y, bo
 
   s_state.pointer_state[index][static_cast<u8>(InputPointerAxis::X)].delta += dx;
   s_state.pointer_state[index][static_cast<u8>(InputPointerAxis::Y)].delta += dy;
-
-  if (index == 0)
-    ImGuiManager::UpdateMousePosition(x, y);
 }
 
 void InputManager::ResetPointerRelativeDelta(u32 index)
@@ -1562,13 +1559,6 @@ void InputManager::UpdatePointerPositionRelativeDelta(u32 index, InputPointerAxi
     std::clamp(s_state.host_pointer_positions[index][static_cast<u8>(axis)].load(std::memory_order_relaxed) + d, 0.0f,
                max_dim),
     std::memory_order_release);
-
-  // Imgui also needs to be updated, since the absolute position won't be set above.
-  if (index == 0)
-  {
-    ImGuiManager::UpdateMousePosition(s_state.host_pointer_positions[0][0].load(std::memory_order_relaxed),
-                                      s_state.host_pointer_positions[0][1].load(std::memory_order_relaxed));
-  }
 }
 
 void InputManager::UpdatePointerWheelRelativeDelta(u32 index, InputPointerAxis axis, float d)