imgui Ref-counted textures

- has a background thread to decode textures

CMakeLists.txt

@@ -601,6 +601,7 @@ set(VIDEO_CORE src/video_core/amdgpu/liverpool.cpp
 set(IMGUI src/imgui/imgui_config.h
           src/imgui/imgui_layer.h
           src/imgui/imgui_std.h
+          src/imgui/imgui_texture.h
           src/imgui/layer/video_info.cpp
           src/imgui/layer/video_info.h
           src/imgui/renderer/imgui_core.cpp
@@ -609,6 +610,8 @@ set(IMGUI src/imgui/imgui_config.h
           src/imgui/renderer/imgui_impl_sdl3.h
           src/imgui/renderer/imgui_impl_vulkan.cpp
           src/imgui/renderer/imgui_impl_vulkan.h
+          src/imgui/renderer/texture_manager.cpp
+          src/imgui/renderer/texture_manager.h
 )
 
 set(INPUT src/input/controller.cpp

src/imgui/imgui_config.h

@@ -26,4 +26,7 @@ extern void assert_fail_debug_msg(const char* msg);
 #define IMGUI_DEFINE_MATH_OPERATORS
 
 #define IM_VEC2_CLASS_EXTRA                                                                        \
-    constexpr ImVec2(float _v) : x(_v), y(_v) {}
+    constexpr ImVec2(float _v) : x(_v), y(_v) {}
+
+#define IM_VEC4_CLASS_EXTRA                                                                        \
+    constexpr ImVec4(float _v) : x(_v), y(_v), z(_v), w(_v) {}

src/imgui/imgui_texture.h

@@ -0,0 +1,45 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <filesystem>
+#include <imgui.h>
+
+namespace ImGui {
+
+namespace Core::TextureManager {
+struct Inner;
+} // namespace Core::TextureManager
+
+class RefCountedTexture {
+    Core::TextureManager::Inner* inner;
+
+    explicit RefCountedTexture(Core::TextureManager::Inner* inner);
+
+public:
+    struct Image {
+        ImTextureID im_id;
+        u32 width;
+        u32 height;
+    };
+
+    static RefCountedTexture DecodePngTexture(std::vector<u8> data);
+
+    static RefCountedTexture DecodePngFile(std::filesystem::path path);
+
+    RefCountedTexture();
+
+    RefCountedTexture(const RefCountedTexture& other);
+    RefCountedTexture(RefCountedTexture&& other) noexcept;
+    RefCountedTexture& operator=(const RefCountedTexture& other);
+    RefCountedTexture& operator=(RefCountedTexture&& other) noexcept;
+
+    virtual ~RefCountedTexture();
+
+    [[nodiscard]] Image GetTexture() const;
+
+    explicit(false) operator bool() const;
+};
+
+}; // namespace ImGui

src/imgui/renderer/imgui_core.cpp

@@ -10,6 +10,7 @@
 #include "imgui_impl_sdl3.h"
 #include "imgui_impl_vulkan.h"
 #include "sdl_window.h"
+#include "texture_manager.h"
 #include "video_core/renderer_vulkan/renderer_vulkan.h"
 
 static void CheckVkResult(const vk::Result err) {
@@ -63,6 +64,8 @@ void Initialize(const ::Vulkan::Instance& instance, const Frontend::WindowSDL& w
         .check_vk_result_fn = &CheckVkResult,
     };
     Vulkan::Init(vk_info);
+
+    TextureManager::StartWorker();
 }
 
 void OnResize() {
@@ -72,6 +75,8 @@ void OnResize() {
 void Shutdown(const vk::Device& device) {
     device.waitIdle();
 
+    TextureManager::StopWorker();
+
     const ImGuiIO& io = GetIO();
     const auto ini_filename = (void*)io.IniFilename;
     const auto log_filename = (void*)io.LogFilename;
@@ -125,7 +130,6 @@ void NewFrame() {
         }
     }
 
-    Vulkan::NewFrame();
     Sdl::NewFrame();
     ImGui::NewFrame();
 
@@ -144,6 +148,8 @@ void NewFrame() {
 }
 
 void Render(const vk::CommandBuffer& cmdbuf, ::Vulkan::Frame* frame) {
+    TextureManager::Tick();
+
     ImGui::Render();
     ImDrawData* draw_data = GetDrawData();
     if (draw_data->CmdListsCount == 0) {