HostInterface: Move OSD messages to base class

src/core/host_interface.cpp

@@ -7,6 +7,7 @@
 #include "host_display.h"
 #include "system.h"
 #include <filesystem>
+#include <imgui.h>
 Log_SetChannel(HostInterface);
 
 #ifdef _WIN32
@@ -82,7 +83,6 @@ void HostInterface::ResetSystem()
   AddOSDMessage("System reset.");
 }
 
-
 void HostInterface::DestroySystem()
 {
   m_system.reset();
@@ -100,6 +100,63 @@ void HostInterface::ReportMessage(const char* message)
   Log_InfoPrintf(message);
 }
 
+void HostInterface::AddOSDMessage(const char* message, float duration /*= 2.0f*/)
+{
+  OSDMessage msg;
+  msg.text = message;
+  msg.duration = duration;
+
+  std::unique_lock<std::mutex> lock(m_osd_messages_lock);
+  m_osd_messages.push_back(std::move(msg));
+}
+
+void HostInterface::DrawOSDMessages()
+{
+  constexpr ImGuiWindowFlags window_flags = ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoInputs |
+                                            ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoSavedSettings |
+                                            ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoNav |
+                                            ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoFocusOnAppearing;
+
+  std::unique_lock<std::mutex> lock(m_osd_messages_lock);
+  const float scale = ImGui::GetIO().DisplayFramebufferScale.x;
+
+  auto iter = m_osd_messages.begin();
+  float position_x = 10.0f * scale;
+  float position_y = (10.0f + (m_settings.display_fullscreen ? 0.0f : 20.0f)) * scale;
+  u32 index = 0;
+  while (iter != m_osd_messages.end())
+  {
+    const OSDMessage& msg = *iter;
+    const double time = msg.time.GetTimeSeconds();
+    const float time_remaining = static_cast<float>(msg.duration - time);
+    if (time_remaining <= 0.0f)
+    {
+      iter = m_osd_messages.erase(iter);
+      continue;
+    }
+
+    const float opacity = std::min(time_remaining, 1.0f);
+    ImGui::SetNextWindowPos(ImVec2(position_x, position_y));
+    ImGui::SetNextWindowSize(ImVec2(0.0f, 0.0f));
+    ImGui::PushStyleVar(ImGuiStyleVar_Alpha, opacity);
+
+    if (ImGui::Begin(SmallString::FromFormat("osd_%u", index++), nullptr, window_flags))
+    {
+      ImGui::TextUnformatted(msg.text.c_str());
+      position_y += ImGui::GetWindowSize().y + (4.0f * scale);
+    }
+
+    ImGui::End();
+    ImGui::PopStyleVar();
+    ++iter;
+  }
+}
+
+void HostInterface::ClearImGuiFocus()
+{
+  ImGui::SetWindowFocus(nullptr);
+}
+
 std::optional<std::vector<u8>> HostInterface::GetBIOSImage(ConsoleRegion region)
 {
   // Try the other default filenames in the directory of the configured BIOS.