Move Presenting, Dumping and ImGui out of Renderer

Source/Core/VideoCommon/OnScreenUI.h

@@ -0,0 +1,78 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <mutex>
+#include <span>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+
+class NativeVertexFormat;
+class AbstractTexture;
+class AbstractPipeline;
+
+namespace VideoCommon
+{
+class OnScreenUI
+{
+public:
+  OnScreenUI() = default;
+  ~OnScreenUI();
+
+  // ImGui initialization depends on being able to create textures and pipelines, so do it last.
+  bool Initialize(u32 width, u32 height, float scale);
+
+  // Returns a lock for the ImGui mutex, enabling data structures to be modified from outside.
+  // Use with care, only non-drawing functions should be called from outside the video thread,
+  // as the drawing is tied to a "frame".
+  std::unique_lock<std::mutex> GetImGuiLock();
+
+  bool IsReady() { return m_ready; }
+
+  // Sets up ImGui state for the next frame.
+  // This function itself acquires the ImGui lock, so it should not be held.
+  void BeginImGuiFrame(u32 width, u32 height);
+
+  // Same as above but without locking the ImGui lock.
+  void BeginImGuiFrameUnlocked(u32 width, u32 height);
+
+  // Renders ImGui windows to the currently-bound framebuffer.
+  // Should be called with the ImGui lock held.
+  void DrawImGui();
+
+  // Recompiles ImGui pipeline - call when stereo mode changes.
+  bool RecompileImGuiPipeline();
+
+  void SetScale(float backbuffer_scale);
+
+  void Finalize();
+
+  // Receive keyboard and mouse from QT
+  void SetKeyMap(std::span<const std::array<int, 2>> key_map);
+  void SetKey(u32 key, bool is_down, const char* chars);
+  void SetMousePos(float x, float y);
+  void SetMousePress(u32 button_mask);
+
+private:
+  // Destroys all ImGui GPU resources, must do before shutdown.
+  void ShutdownImGui();
+
+  void DrawDebugText();
+
+  // ImGui resources.
+  std::unique_ptr<NativeVertexFormat> m_imgui_vertex_format;
+  std::vector<std::unique_ptr<AbstractTexture>> m_imgui_textures;
+  std::unique_ptr<AbstractPipeline> m_imgui_pipeline;
+  std::mutex m_imgui_mutex;
+  u64 m_imgui_last_frame_time;
+
+  u32 m_backbuffer_width = 1;
+  u32 m_backbuffer_height = 1;
+  float m_backbuffer_scale = 1.0;
+
+  bool m_ready = false;
+};
+}  // namespace VideoCommon