gui: initialize a ImGui application irritator-gui

The gui uses DirectX12 or GLFW for Windows or Unix/Linux.

.gitlab-ci.yml

@@ -6,7 +6,7 @@ variables:
 build:
   stage: build
   before_script:
-    - apt update && apt -y install cmake g++ ninja-build
+    - apt update && apt -y install cmake g++ ninja-build libglew-dev libglfw3-dev
   script:
     - mkdir build && cd build
     - cmake -G Ninja ..

.travis.yml

@@ -12,6 +12,8 @@ branches:
 addons:
   apt:
     packages: &common_packages
+      - libglew-dev
+      - libglfw3-dev
       - lcov
       - cmake
       - make

CMakeLists.txt

@@ -5,6 +5,8 @@ project(irritator VERSION 0.1.0 LANGUAGES CXX)
 # https://cmake.org/cmake/help/v3.0/module/GNUInstallDirs.html
 include(GNUInstallDirs)
 
+option(WITH_GUI "Build the graphical user interface [default: ON]" ON)
+
 find_package(Threads REQUIRED)
 add_library(threads INTERFACE IMPORTED)
 set_property(TARGET threads PROPERTY

app/CMakeLists.txt

@@ -29,3 +29,7 @@ install(TARGETS app
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+if (WITH_GUI)
+    add_subdirectory(gui)
+endif ()

app/gui/CMakeLists.txt

+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+project(irritator-gui VERSION 0.1.0 LANGUAGES CXX)
+
+set(gui_sources
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui.cpp
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui.h
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui_demo.cpp
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui_draw.cpp
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui_widgets.cpp
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui_internal.h
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imconfig.h
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imstb_rectpack.h
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imstb_textedit.h
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/imstb_truetype.h)
+
+if (WIN32)
+    list(APPEND gui_sources
+        main-windows.cpp
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_win32.cpp
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_win32.h
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_dx12.h
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_dx12.cpp)
+else ()
+    find_package(glfw3 REQUIRED)
+    find_package(GLEW REQUIRED)
+    list(APPEND gui_sources
+        main-unix.cpp
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_glfw.cpp
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_glfw.h
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_opengl3.cpp
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/imgui_impl_opengl3.h
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/libs/gl3w/GL/gl3w.c
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/libs/gl3w/GL/gl3w.h
+        ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/libs/gl3w/GL/glcorearb.h)
+endif ()
+
+add_executable(irritator-gui ${gui_sources})
+
+target_include_directories(irritator-gui
+    PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/lib/include>
+    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/lib/include>
+    $<INSTALL_INTERFACE:include>
+    PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${PROJECT_SOURCE_DIR}/../../external/imgui
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/examples
+    ${PROJECT_SOURCE_DIR}/../../external/imgui/examples/libs/gl3w)
+
+target_link_libraries(irritator-gui
+    PRIVATE
+    $<$<PLATFORM_ID:Linux>:GLEW::GLEW>
+    $<$<CXX_COMPILER_ID:GNU>:stdc++fs>
+    $<$<CXX_COMPILER_ID:Clang>:c++fs>
+    threads
+    $<$<PLATFORM_ID:Linux>:dl>
+    $<$<PLATFORM_ID:Linux>:GL>
+    $<$<PLATFORM_ID:Linux>:glfw>
+    $<$<PLATFORM_ID:Windows>:d3d12>
+    $<$<PLATFORM_ID:Windows>:dxguid>
+    $<$<PLATFORM_ID:Windows>:dxgi>
+    $<$<PLATFORM_ID:Windows>:d3dcompiler>
+    libirritator)
+
+target_compile_definitions(irritator-gui
+    PRIVATE
+    $<$<CXX_COMPILER_ID:MSVC>:_CRT_SECURE_NO_WARNINGS>
+    $<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>
+    VERSION_MAJOR=${PROJECT_VERSION_MAJOR}
+    VERSION_MINOR=${PROJECT_VERSION_MINOR}
+    VERSION_PATCH=${PROJECT_VERSION_PATCH})
+
+set_target_properties(irritator-gui PROPERTIES
+    OUTPUT_NAME "irritator-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
+    CXX_STANDARD 20)
+
+install(TARGETS irritator-gui
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})

app/gui/main-unix.cpp

+// Copyright (c) 2020 INRA Distributed under the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+
+#include <cstdio>
+#include <cstring>
+
+// About OpenGL function loaders: modern OpenGL doesn't have a standard header
+// file and requires individual function pointers to be loaded manually. Helper
+// libraries are often used for this purpose! Here we are supporting a few
+// common ones: gl3w, glew, glad. You may use another loader/header of your
+// choice (glext, glLoadGen, etc.), or chose to manually implement your own.
+#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
+#include <GL/gl3w.h> // Initialize with gl3wInit()
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
+#include <GL/glew.h> // Initialize with glewInit()
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
+#include <glad/glad.h> // Initialize with gladLoadGL()
+#else
+#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
+#endif
+
+// Include glfw3.h after our OpenGL definitions
+#include <GLFW/glfw3.h>
+
+// [Win32] Our example includes a copy of glfw3.lib pre-compiled with VS2010 to
+// maximize ease of testing and compatibility with old VS compilers. To link
+// with VS2010-era libraries, VS2015+ requires linking with
+// legacy_stdio_definitions.lib, which we do using this pragma. Your own
+// project should not be affected, as you are likely to link with a newer
+// binary of GLFW that is adequate for your version of Visual Studio.
+#if defined(_MSC_VER) && (_MSC_VER >= 1900) &&                                \
+  !defined(IMGUI_DISABLE_WIN32_FUNCTIONS)
+#pragma comment(lib, "legacy_stdio_definitions")
+#endif
+
+static void
+glfw_error_callback(int error, const char* description)
+{
+    fprintf(
+      stderr,
+      "Glfw Error %d: %s\nTry to use declare environment variables before "
+      "running irritator. For example:\n$ MESA_GLSL_VERSION_OVERRIDE=450 env "
+      "MESA_GL_VERSION_OVERRIDE=4.5COMPAT ./irritator\n",
+      error,
+      description);
+}
+
+int
+main(int argc, char* argv[])
+{
+    // Setup window
+    glfwSetErrorCallback(glfw_error_callback);
+    if (!glfwInit())
+        return 1;
+
+        // Decide GL+GLSL versions
+#if __APPLE__
+    // GL 3.2 + GLSL 150
+    const char* glsl_version = "#version 150";
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // 3.2+ only
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Required on Mac
+#else
+    // GL 3.0 + GLSL 130
+    const char* glsl_version = "#version 130";
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    // glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+
+    // only glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // 3.0+ only
+#endif
+
+    // Create window with graphics context
+    GLFWwindow* window = glfwCreateWindow(
+      1280, 720, "Dear ImGui GLFW+OpenGL3 example", NULL, NULL);
+    if (window == NULL)
+        return 1;
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1); // Enable vsync
+
+    // Initialize OpenGL loader
+#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
+    bool err = gl3wInit() != 0;
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
+    bool err = glewInit() != GLEW_OK;
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
+    bool err = gladLoadGL() == 0;
+#else
+    bool err =
+      false; // If you use IMGUI_IMPL_OPENGL_LOADER_CUSTOM, your loader
+             // is likely to requires some form of initialization.
+#endif
+    if (err) {
+        fprintf(stderr, "Failed to initialize OpenGL loader!\n");
+        return 1;
+    }
+
+    // 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
+
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    // ImGui::StyleColorsClassic();
+
+    // Setup Platform/Renderer bindings
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
+    ImGui_ImplOpenGL3_Init(glsl_version);
+
+    // Load Fonts
+    // - If no fonts are loaded, dear imgui will use the default font. You can
+    // also load multiple fonts and use ImGui::PushFont()/PopFont() to select
+    // them.
+    // - AddFontFromFileTTF() will return the ImFont* so you can store it if
+    // you need to select the font among multiple.
+    // - If the file cannot be loaded, the function will return NULL. Please
+    // handle those errors in your application (e.g. use an assertion, or
+    // display an error and quit).
+    // - The fonts will be rasterized at a given size (w/ oversampling) and
+    // stored into a texture when calling
+    // ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame
+    // below will call.
+    // - Read 'misc/fonts/README.txt' for more instructions and details.
+    // - Remember that in C/C++ if you want to include a backslash \ in a
+    // string literal you need to write a double backslash \\ !
+    // io.Fonts->AddFontDefault();
+    // io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+    // io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+    // io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+    // io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    // ImFont* font =
+    // io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f,
+    // NULL, io.Fonts->GetGlyphRangesJapanese()); IM_ASSERT(font != NULL);
+
+    bool show_demo_window = true;
+    bool show_another_window = false;
+    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+
+    // Main loop
+    while (!glfwWindowShouldClose(window)) {
+        // 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.
+        // - When io.WantCaptureKeyboard is true, do not dispatch keyboard
+        // input data to your main application. Generally you may always pass
+        // all inputs to dear imgui, and hide them from your application based
+        // on those two flags.
+        glfwPollEvents();
+
+        // Start the Dear ImGui frame
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_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 created 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 / ImGui::GetIO().Framerate,
+                        ImGui::GetIO().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();
+        int display_w, display_h;
+        glfwMakeContextCurrent(window);
+        glfwGetFramebufferSize(window, &display_w, &display_h);
+        glViewport(0, 0, display_w, display_h);
+        glClearColor(
+          clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        glfwMakeContextCurrent(window);
+        glfwSwapBuffers(window);
+    }
+
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
+
+    glfwDestroyWindow(window);
+    glfwTerminate();
+
+    return 0;
+}
+

app/gui/main-windows.cpp

+// Copyright (c) 2020 INRA Distributed under the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// dear imgui: standalone example application for DirectX 12
+// If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp.
+// FIXME: 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*))
+
+#include "imgui.h"
+#include "imgui_impl_win32.h"
+#include "imgui_impl_dx12.h"
+#include <d3d12.h>
+#include <dxgi1_4.h>
+#include <tchar.h>
+
+//#define DX12_ENABLE_DEBUG_LAYER
+
+#ifdef DX12_ENABLE_DEBUG_LAYER
+#include <dxgidebug.h>
+#pragma comment(lib, "dxguid.lib")
+#endif
+
+struct FrameContext
+{
+    ID3D12CommandAllocator* CommandAllocator;
+    UINT64                  FenceValue;
+};
+
+// Data
+static int const                    NUM_FRAMES_IN_FLIGHT = 3;
+static FrameContext                 g_frameContext[NUM_FRAMES_IN_FLIGHT] = {};
+static UINT                         g_frameIndex = 0;
+
+static int const                    NUM_BACK_BUFFERS = 3;
+static ID3D12Device* g_pd3dDevice = NULL;
+static ID3D12DescriptorHeap* g_pd3dRtvDescHeap = NULL;
+static ID3D12DescriptorHeap* g_pd3dSrvDescHeap = NULL;
+static ID3D12CommandQueue* g_pd3dCommandQueue = NULL;
+static ID3D12GraphicsCommandList* g_pd3dCommandList = NULL;
+static ID3D12Fence* g_fence = NULL;
+static HANDLE                       g_fenceEvent = NULL;
+static UINT64                       g_fenceLastSignaledValue = 0;
+static IDXGISwapChain3* g_pSwapChain = NULL;
+static HANDLE                       g_hSwapChainWaitableObject = NULL;
+static ID3D12Resource* g_mainRenderTargetResource[NUM_BACK_BUFFERS] = {};
+static D3D12_CPU_DESCRIPTOR_HANDLE  g_mainRenderTargetDescriptor[NUM_BACK_BUFFERS] = {};
+
+// Forward declarations of helper functions
+bool CreateDeviceD3D(HWND hWnd);
+void CleanupDeviceD3D();
+void CreateRenderTarget();
+void CleanupRenderTarget();
+void WaitForLastSubmittedFrame();
+FrameContext* WaitForNextFrameResources();
+void ResizeSwapChain(HWND hWnd, int width, int height);
+LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+// Main code
+int main(int, char**)
+{
+    // Create application window
+    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, _T("ImGui Example"), NULL };
+    ::RegisterClassEx(&wc);
+    HWND hwnd = ::CreateWindow(wc.lpszClassName, _T("Dear ImGui DirectX12 Example"), WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
+
+    // Initialize Direct3D
+    if (!CreateDeviceD3D(hwnd))
+    {
+        CleanupDeviceD3D();
+        ::UnregisterClass(wc.lpszClassName, wc.hInstance);
+        return 1;
+    }
+
+    // Show the window
+    ::ShowWindow(hwnd, SW_SHOWDEFAULT);
+    ::UpdateWindow(hwnd);
+
+    // 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
+
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
+    // Setup Platform/Renderer bindings
+    ImGui_ImplWin32_Init(hwnd);
+    ImGui_ImplDX12_Init(g_pd3dDevice, NUM_FRAMES_IN_FLIGHT,
+        DXGI_FORMAT_R8G8B8A8_UNORM, g_pd3dSrvDescHeap,
+        g_pd3dSrvDescHeap->GetCPUDescriptorHandleForHeapStart(),
+        g_pd3dSrvDescHeap->GetGPUDescriptorHandleForHeapStart());
+
+    // Load Fonts
+    // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
+    // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
+    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
+    // - Read 'docs/FONTS.txt' for more instructions and details.
+    // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
+    //io.Fonts->AddFontDefault();
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //IM_ASSERT(font != NULL);
+
+    // 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
+    MSG msg;
+    ZeroMemory(&msg, sizeof(msg));
+    while (msg.message != WM_QUIT)
+    {
+        // Poll and handle messages (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.
+        // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
+        // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+        if (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        {
+            ::TranslateMessage(&msg);
+            ::DispatchMessage(&msg);
+            continue;
+        }
+
+        // Start the Dear ImGui frame
+        ImGui_ImplDX12_NewFrame();
+        ImGui_ImplWin32_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 created 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 / ImGui::GetIO().Framerate, ImGui::GetIO().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
+        FrameContext* frameCtxt = WaitForNextFrameResources();
+        UINT backBufferIdx = g_pSwapChain->GetCurrentBackBufferIndex();
+        frameCtxt->CommandAllocator->Reset();
+
+        D3D12_RESOURCE_BARRIER barrier = {};
+        barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
+        barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
+        barrier.Transition.pResource = g_mainRenderTargetResource[backBufferIdx];
+        barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
+        barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
+        barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
+
+        g_pd3dCommandList->Reset(frameCtxt->CommandAllocator, NULL);
+        g_pd3dCommandList->ResourceBarrier(1, &barrier);
+        g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], (float*)&clear_color, 0, NULL);
+        g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
+        g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
+        ImGui::Render();
+        ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_pd3dCommandList);
+        barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
+        barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
+        g_pd3dCommandList->ResourceBarrier(1, &barrier);
+        g_pd3dCommandList->Close();
+
+        g_pd3dCommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&g_pd3dCommandList);
+
+        g_pSwapChain->Present(1, 0); // Present with vsync
+        //g_pSwapChain->Present(0, 0); // Present without vsync
+
+        UINT64 fenceValue = g_fenceLastSignaledValue + 1;
+        g_pd3dCommandQueue->Signal(g_fence, fenceValue);
+        g_fenceLastSignaledValue = fenceValue;
+        frameCtxt->FenceValue = fenceValue;
+    }
+
+    WaitForLastSubmittedFrame();
+    ImGui_ImplDX12_Shutdown();
+    ImGui_ImplWin32_Shutdown();
+    ImGui::DestroyContext();
+
+    CleanupDeviceD3D();
+    ::DestroyWindow(hwnd);
+    ::UnregisterClass(wc.lpszClassName, wc.hInstance);
+
+    return 0;
+}
+
+// Helper functions
+
+bool CreateDeviceD3D(HWND hWnd)
+{
+    // Setup swap chain
+    DXGI_SWAP_CHAIN_DESC1 sd;
+    {
+        ZeroMemory(&sd, sizeof(sd));
+        sd.BufferCount = NUM_BACK_BUFFERS;
+        sd.Width = 0;
+        sd.Height = 0;
+        sd.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+        sd.Flags = DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT;
+        sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+        sd.SampleDesc.Count = 1;
+        sd.SampleDesc.Quality = 0;
+        sd.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
+        sd.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
+        sd.Scaling = DXGI_SCALING_STRETCH;
+        sd.Stereo = FALSE;
+    }
+
+#ifdef DX12_ENABLE_DEBUG_LAYER
+    ID3D12Debug* pdx12Debug = NULL;
+    if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(&pdx12Debug))))
+    {
+        pdx12Debug->EnableDebugLayer();
+        pdx12Debug->Release();
+    }
+#endif
+
+    D3D_FEATURE_LEVEL featureLevel = D3D_FEATURE_LEVEL_11_0;