examples/example_sdl3_directx11/main.cpp - third_party/imgui - Git at Google

 // Dear ImGui: standalone example application for SDL3 + DirectX 11
 // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)

 // Learn about Dear ImGui:
 // - FAQ                  https://dearimgui.com/faq
 // - Getting Started      https://dearimgui.com/getting-started
 // - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
 // - Introduction, links and more at the top of imgui.cpp

 #include "imgui.h"
 #include "imgui_impl_sdl3.h"
 #include "imgui_impl_dx11.h"
 #include <d3d11.h>
 #include <stdio.h>              // printf
 #include <SDL3/SDL.h>

 // Data
 static ID3D11Device*            g_pd3dDevice = nullptr;
 static ID3D11DeviceContext*     g_pd3dDeviceContext = nullptr;
 static IDXGISwapChain*          g_pSwapChain = nullptr;
 static ID3D11RenderTargetView*  g_mainRenderTargetView = nullptr;

 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
 void CleanupDeviceD3D();
 void CreateRenderTarget();
 void CleanupRenderTarget();

 // Main code
 int main(int, char**)
 {
     // Setup SDL
     // [If using SDL_MAIN_USE_CALLBACKS: all code below until the main loop starts would likely be your SDL_AppInit() function]
     if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD))
     {
         printf("Error: SDL_Init(): %s\n", SDL_GetError());
         return 1;
     }

     // Setup window
     float main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
     SDL_WindowFlags window_flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN | SDL_WINDOW_HIGH_PIXEL_DENSITY;
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+DirectX11 example", (int)(1280 * main_scale), (int)(800 * main_scale), window_flags);
     if (window == nullptr)
     {
         printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
         return 1;
     }

     SDL_PropertiesID props = SDL_GetWindowProperties(window);
     HWND hwnd = (HWND)SDL_GetPointerProperty(props, SDL_PROP_WINDOW_WIN32_HWND_POINTER, nullptr);

     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))
     {
         CleanupDeviceD3D();
         return 1;
     }

     SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
     SDL_ShowWindow(window);

     // Setup Dear ImGui context
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
     io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
     io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
     //io.ConfigViewportsNoAutoMerge = true;
     //io.ConfigViewportsNoTaskBarIcon = true;

     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsLight();

     // Setup scaling
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (using io.ConfigDpiScaleFonts=true makes this unnecessary. We leave both here for documentation purpose)
     io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
     io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.

     // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
     if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
     {
         style.WindowRounding = 0.0f;
         style.Colors[ImGuiCol_WindowBg].w = 1.0f;
     }

     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForD3D(window);
     ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext);

     // Load Fonts
     // - If fonts are not explicitly loaded, Dear ImGui will call AddFontDefault() to select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
     //   This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
     // - You can load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - If a file cannot be loaded, AddFont functions will return a nullptr. Please handle those errors in your code (e.g. use an assertion, display an error and quit).
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use FreeType for higher quality font rendering.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
     //style.FontSizeBase = 20.0f;
     //io.Fonts->AddFontDefaultVector();
     //io.Fonts->AddFontDefaultBitmap();
     //io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf");
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf");
     //IM_ASSERT(font != nullptr);

     // Our state
     bool show_demo_window = true;
     bool show_another_window = false;
     ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

     // Main loop
     bool done = false;
     while (!done)
     {
         // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
         // [If using SDL_MAIN_USE_CALLBACKS: call ImGui_ImplSDL3_ProcessEvent() from your SDL_AppEvent() function]
         SDL_Event event;
         while (SDL_PollEvent(&event))
         {
             ImGui_ImplSDL3_ProcessEvent(&event);
             if (event.type == SDL_EVENT_QUIT)
                 done = true;
             if (event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event.window.windowID == SDL_GetWindowID(window))
                 done = true;
             if (event.type == SDL_EVENT_WINDOW_RESIZED && event.window.windowID == SDL_GetWindowID(window))
             {
                 // Release all outstanding references to the swap chain's buffers before resizing.
                 CleanupRenderTarget();
                 g_pSwapChain->ResizeBuffers(0, 0, 0, DXGI_FORMAT_UNKNOWN, 0);
                 CreateRenderTarget();
             }
         }

         // [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppIterate() function]
         if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
         {
             SDL_Delay(10);
             continue;
         }

         // Start the Dear ImGui frame
         ImGui_ImplDX11_NewFrame();
         ImGui_ImplSDL3_NewFrame();
         ImGui::NewFrame();

         // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
         if (show_demo_window)
             ImGui::ShowDemoWindow(&show_demo_window);

         // 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
         {
             static float f = 0.0f;
             static int counter = 0;

             ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.

             ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
             ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
             ImGui::Checkbox("Another Window", &show_another_window);

             ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
             ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color

             if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
                 counter++;
             ImGui::SameLine();
             ImGui::Text("counter = %d", counter);

             ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
             ImGui::End();
         }

         // 3. Show another simple window.
         if (show_another_window)
         {
             ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
             ImGui::Text("Hello from another window!");
             if (ImGui::Button("Close Me"))
                 show_another_window = false;
             ImGui::End();
         }

         // Rendering
         ImGui::Render();
         const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
         g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());

         // Update and Render additional Platform Windows
         if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
         {
             ImGui::UpdatePlatformWindows();
             ImGui::RenderPlatformWindowsDefault();
         }

         g_pSwapChain->Present(1, 0); // Present with vsync
         //g_pSwapChain->Present(0, 0); // Present without vsync
     }

     // Cleanup
     // [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppQuit() function]
     ImGui_ImplDX11_Shutdown();
     ImGui_ImplSDL3_Shutdown();
     ImGui::DestroyContext();

     CleanupDeviceD3D();
     SDL_DestroyWindow(window);
     SDL_Quit();

     return 0;
 }

 // Helper functions to use DirectX11
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
     // This is a basic setup. Optimally could use e.g. DXGI_SWAP_EFFECT_FLIP_DISCARD and handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC sd;
     ZeroMemory(&sd, sizeof(sd));
     sd.BufferCount = 2;
     sd.BufferDesc.Width = 0;
     sd.BufferDesc.Height = 0;
     sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
     sd.BufferDesc.RefreshRate.Numerator = 60;
     sd.BufferDesc.RefreshRate.Denominator = 1;
     sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
     sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
     sd.OutputWindow = hWnd;
     sd.SampleDesc.Count = 1;
     sd.SampleDesc.Quality = 0;
     sd.Windowed = TRUE;
     sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

     UINT createDeviceFlags = 0;
     //createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;
     D3D_FEATURE_LEVEL featureLevel;
     const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0, };
     HRESULT res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
     if (res == DXGI_ERROR_UNSUPPORTED) // Try high-performance WARP software driver if hardware is not available.
         res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_WARP, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
     if (res != S_OK)
         return false;

     // Disable DXGI's default Alt+Enter fullscreen behavior.
     // - You are free to leave this enabled, but it will not work properly with multiple viewports.
     // - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
     IDXGIFactory* pSwapChainFactory;
     if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
     {
         pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
         pSwapChainFactory->Release();
     }

     CreateRenderTarget();
     return true;
 }

 void CleanupDeviceD3D()
 {
     CleanupRenderTarget();
     if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
     if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
     if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
 }

 void CreateRenderTarget()
 {
     ID3D11Texture2D* pBackBuffer;
     g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
     g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
     pBackBuffer->Release();
 }

 void CleanupRenderTarget()
 {
     if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; }
 }
	// Dear ImGui: standalone example application for SDL3 + DirectX 11
	// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)

	// Learn about Dear ImGui:
	// - FAQ https://dearimgui.com/faq
	// - Getting Started https://dearimgui.com/getting-started
	// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
	// - Introduction, links and more at the top of imgui.cpp

	#include "imgui.h"
	#include "imgui_impl_sdl3.h"
	#include "imgui_impl_dx11.h"
	#include <d3d11.h>
	#include <stdio.h> // printf
	#include <SDL3/SDL.h>

	// Data
	static ID3D11Device* g_pd3dDevice = nullptr;
	static ID3D11DeviceContext* g_pd3dDeviceContext = nullptr;
	static IDXGISwapChain* g_pSwapChain = nullptr;
	static ID3D11RenderTargetView* g_mainRenderTargetView = nullptr;

	// Forward declarations of helper functions
	bool CreateDeviceD3D(HWND hWnd);
	void CleanupDeviceD3D();
	void CreateRenderTarget();
	void CleanupRenderTarget();

	// Main code
	int main(int, char**)
	{
	// Setup SDL
	// [If using SDL_MAIN_USE_CALLBACKS: all code below until the main loop starts would likely be your SDL_AppInit() function]
	if (!SDL_Init(SDL_INIT_VIDEO \| SDL_INIT_GAMEPAD))
	{
	printf("Error: SDL_Init(): %s\n", SDL_GetError());
	return 1;
	}

	// Setup window
	float main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
	SDL_WindowFlags window_flags = SDL_WINDOW_RESIZABLE \| SDL_WINDOW_HIDDEN \| SDL_WINDOW_HIGH_PIXEL_DENSITY;
	SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+DirectX11 example", (int)(1280 * main_scale), (int)(800 * main_scale), window_flags);
	if (window == nullptr)
	{
	printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
	return 1;
	}

	SDL_PropertiesID props = SDL_GetWindowProperties(window);
	HWND hwnd = (HWND)SDL_GetPointerProperty(props, SDL_PROP_WINDOW_WIN32_HWND_POINTER, nullptr);

	// Initialize Direct3D
	if (!CreateDeviceD3D(hwnd))
	{
	CleanupDeviceD3D();
	return 1;
	}

	SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
	SDL_ShowWindow(window);

	// Setup Dear ImGui context
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void)io;
	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
	io.ConfigFlags \|= ImGuiConfigFlags_DockingEnable; // Enable Docking
	io.ConfigFlags \|= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows
	//io.ConfigViewportsNoAutoMerge = true;
	//io.ConfigViewportsNoTaskBarIcon = true;

	// Setup Dear ImGui style
	ImGui::StyleColorsDark();
	//ImGui::StyleColorsLight();

	// Setup scaling
	ImGuiStyle& style = ImGui::GetStyle();
	style.ScaleAllSizes(main_scale); // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
	style.FontScaleDpi = main_scale; // Set initial font scale. (using io.ConfigDpiScaleFonts=true makes this unnecessary. We leave both here for documentation purpose)
	io.ConfigDpiScaleFonts = true; // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
	io.ConfigDpiScaleViewports = true; // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.

	// When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
	{
	style.WindowRounding = 0.0f;
	style.Colors[ImGuiCol_WindowBg].w = 1.0f;
	}

	// Setup Platform/Renderer backends
	ImGui_ImplSDL3_InitForD3D(window);
	ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext);

	// Load Fonts
	// - If fonts are not explicitly loaded, Dear ImGui will call AddFontDefault() to select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
	// This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
	// - You can load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
	// - If a file cannot be loaded, AddFont functions will return a nullptr. Please handle those errors in your code (e.g. use an assertion, display an error and quit).
	// - Read 'docs/FONTS.md' for more instructions and details.
	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use FreeType for higher quality font rendering.
	// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
	//style.FontSizeBase = 20.0f;
	//io.Fonts->AddFontDefaultVector();
	//io.Fonts->AddFontDefaultBitmap();
	//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf");
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
	//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf");
	//IM_ASSERT(font != nullptr);

	// Our state
	bool show_demo_window = true;
	bool show_another_window = false;
	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

	// Main loop
	bool done = false;
	while (!done)
	{
	// Poll and handle events (inputs, window resize, etc.)
	// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
	// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
	// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
	// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
	// [If using SDL_MAIN_USE_CALLBACKS: call ImGui_ImplSDL3_ProcessEvent() from your SDL_AppEvent() function]
	SDL_Event event;
	while (SDL_PollEvent(&event))
	{
	ImGui_ImplSDL3_ProcessEvent(&event);
	if (event.type == SDL_EVENT_QUIT)
	done = true;
	if (event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event.window.windowID == SDL_GetWindowID(window))
	done = true;
	if (event.type == SDL_EVENT_WINDOW_RESIZED && event.window.windowID == SDL_GetWindowID(window))
	{
	// Release all outstanding references to the swap chain's buffers before resizing.
	CleanupRenderTarget();
	g_pSwapChain->ResizeBuffers(0, 0, 0, DXGI_FORMAT_UNKNOWN, 0);
	CreateRenderTarget();
	}
	}

	// [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppIterate() function]
	if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
	{
	SDL_Delay(10);
	continue;
	}

	// Start the Dear ImGui frame
	ImGui_ImplDX11_NewFrame();
	ImGui_ImplSDL3_NewFrame();
	ImGui::NewFrame();

	// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
	if (show_demo_window)
	ImGui::ShowDemoWindow(&show_demo_window);

	// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
	{
	static float f = 0.0f;
	static int counter = 0;

	ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.

	ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
	ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
	ImGui::Checkbox("Another Window", &show_another_window);

	ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
	ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color

	if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
	counter++;
	ImGui::SameLine();
	ImGui::Text("counter = %d", counter);

	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
	ImGui::End();
	}

	// 3. Show another simple window.
	if (show_another_window)
	{
	ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
	ImGui::Text("Hello from another window!");
	if (ImGui::Button("Close Me"))
	show_another_window = false;
	ImGui::End();
	}

	// Rendering
	ImGui::Render();
	const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
	g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
	g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
	ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());

	// Update and Render additional Platform Windows
	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
	{
	ImGui::UpdatePlatformWindows();
	ImGui::RenderPlatformWindowsDefault();
	}

	g_pSwapChain->Present(1, 0); // Present with vsync
	//g_pSwapChain->Present(0, 0); // Present without vsync
	}

	// Cleanup
	// [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppQuit() function]
	ImGui_ImplDX11_Shutdown();
	ImGui_ImplSDL3_Shutdown();
	ImGui::DestroyContext();

	CleanupDeviceD3D();
	SDL_DestroyWindow(window);
	SDL_Quit();

	return 0;
	}

	// Helper functions to use DirectX11
	bool CreateDeviceD3D(HWND hWnd)
	{
	// Setup swap chain
	// This is a basic setup. Optimally could use e.g. DXGI_SWAP_EFFECT_FLIP_DISCARD and handle fullscreen mode differently. See #8979 for suggestions.
	DXGI_SWAP_CHAIN_DESC sd;
	ZeroMemory(&sd, sizeof(sd));
	sd.BufferCount = 2;
	sd.BufferDesc.Width = 0;
	sd.BufferDesc.Height = 0;
	sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
	sd.BufferDesc.RefreshRate.Numerator = 60;
	sd.BufferDesc.RefreshRate.Denominator = 1;
	sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
	sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
	sd.OutputWindow = hWnd;
	sd.SampleDesc.Count = 1;
	sd.SampleDesc.Quality = 0;
	sd.Windowed = TRUE;
	sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

	UINT createDeviceFlags = 0;
	//createDeviceFlags \|= D3D11_CREATE_DEVICE_DEBUG;
	D3D_FEATURE_LEVEL featureLevel;
	const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0, };
	HRESULT res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
	if (res == DXGI_ERROR_UNSUPPORTED) // Try high-performance WARP software driver if hardware is not available.
	res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_WARP, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
	if (res != S_OK)
	return false;

	// Disable DXGI's default Alt+Enter fullscreen behavior.
	// - You are free to leave this enabled, but it will not work properly with multiple viewports.
	// - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
	IDXGIFactory* pSwapChainFactory;
	if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
	{
	pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
	pSwapChainFactory->Release();
	}

	CreateRenderTarget();
	return true;
	}

	void CleanupDeviceD3D()
	{
	CleanupRenderTarget();
	if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
	if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
	if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
	}

	void CreateRenderTarget()
	{
	ID3D11Texture2D* pBackBuffer;
	g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
	g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
	pBackBuffer->Release();
	}

	void CleanupRenderTarget()
	{
	if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; }
	}