Add imgui golf mode overlay

Source/Core/VideoCommon/NetPlayGolfUI.cpp

@@ -0,0 +1,66 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "Common/StringUtil.h"
+
+#include "Core/NetPlayClient.h"
+
+#include "VideoCommon/NetPlayGolfUI.h"
+
+#include <imgui.h>
+
+constexpr float DEFAULT_WINDOW_WIDTH = 220.0f;
+constexpr float DEFAULT_WINDOW_HEIGHT = 45.0f;
+
+std::unique_ptr<NetPlayGolfUI> g_netplay_golf_ui;
+
+NetPlayGolfUI::NetPlayGolfUI(std::shared_ptr<NetPlay::NetPlayClient> netplay_client)
+{
+  m_netplay_client = netplay_client;
+}
+
+void NetPlayGolfUI::Display()
+{
+  auto client = m_netplay_client.lock();
+  if (!client)
+    return;
+
+  const float scale = ImGui::GetIO().DisplayFramebufferScale.x;
+
+  ImGui::SetNextWindowPos(ImVec2((20.0f + DEFAULT_WINDOW_WIDTH) * scale, 10.0f * scale),
+                          ImGuiCond_FirstUseEver);
+  ImGui::SetNextWindowSizeConstraints(
+      ImVec2(DEFAULT_WINDOW_WIDTH * scale, DEFAULT_WINDOW_HEIGHT * scale),
+      ImGui::GetIO().DisplaySize);
+
+  // TODO: Translate these strings once imgui has multilingual fonts
+  if (!ImGui::Begin("Golf Mode", nullptr, ImGuiWindowFlags_None))
+  {
+    ImGui::End();
+    return;
+  }
+
+  ImGui::Text("Current Golfer: %s", client->GetCurrentGolfer().c_str());
+
+  if (client->LocalPlayerHasControllerMapped())
+  {
+    if (ImGui::Button("Take Control"))
+    {
+      client->RequestGolfControl();
+    }
+
+    for (auto player : client->GetPlayers())
+    {
+      if (client->IsLocalPlayer(player->pid) || !client->PlayerHasControllerMapped(player->pid))
+        continue;
+
+      if (ImGui::Button(StringFromFormat("Give Control to %s", player->name.c_str()).c_str()))
+      {
+        client->RequestGolfControl(player->pid);
+      }
+    }
+  }
+
+  ImGui::End();
+}