examples/example_win32_directx10/main.cpp - external/github.com/ocornut/imgui - Git at Google

 // Dear ImGui: standalone example application for DirectX 10
 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 // Read online: https://github.com/ocornut/imgui/tree/master/docs

 #include "imgui.h"
 #include "imgui_impl_win32.h"
 #include "imgui_impl_dx10.h"
 #include <d3d10_1.h>
 #include <d3d10.h>
 #define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>
 #include <tchar.h>

 // Data
 static ID3D10Device*            g_pd3dDevice = NULL;
 static IDXGISwapChain*          g_pSwapChain = NULL;
 static ID3D10RenderTargetView*  g_mainRenderTargetView = NULL;

 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
 void CleanupDeviceD3D();
 void CreateRenderTarget();
 void CleanupRenderTarget();
 LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

 // Main code
 int main(int, char**)
 {
     ImGui_ImplWin32_EnableDpiAwareness();

     // Create application window
     //ImGui_ImplWin32_EnableDpiAwareness();
     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 DirectX10 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
     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::StyleColorsClassic();

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

     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
     ImGui_ImplDX10_Init(g_pd3dDevice);

     // 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.md' 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_ImplDX10_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
         ImGui::Render();
         g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
         g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
         ImGui_ImplDX10_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
     }

     ImGui_ImplDX10_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_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 |= D3D10_CREATE_DEVICE_DEBUG;
     if (D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice) != S_OK)
         return false;

     CreateRenderTarget();
     return true;
 }

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

 void CreateRenderTarget()
 {
     ID3D10Texture2D* pBackBuffer;
     g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
     g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView);
     pBackBuffer->Release();
 }

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

 // Forward declare message handler from imgui_impl_win32.cpp
 extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

 // Win32 message handler
 LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
         return true;

     switch (msg)
     {
     case WM_SIZE:
         if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
         {
             CleanupRenderTarget();
             g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
             CreateRenderTarget();
         }
         return 0;
     case WM_SYSCOMMAND:
         if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
             return 0;
         break;
     case WM_DESTROY:
         ::PostQuitMessage(0);
         return 0;
     }
     return ::DefWindowProc(hWnd, msg, wParam, lParam);
 }
	// Dear ImGui: standalone example application for DirectX 10
	// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
	// Read online: https://github.com/ocornut/imgui/tree/master/docs

	#include "imgui.h"
	#include "imgui_impl_win32.h"
	#include "imgui_impl_dx10.h"
	#include <d3d10_1.h>
	#include <d3d10.h>
	#define DIRECTINPUT_VERSION 0x0800
	#include <dinput.h>
	#include <tchar.h>

	// Data
	static ID3D10Device* g_pd3dDevice = NULL;
	static IDXGISwapChain* g_pSwapChain = NULL;
	static ID3D10RenderTargetView* g_mainRenderTargetView = NULL;

	// Forward declarations of helper functions
	bool CreateDeviceD3D(HWND hWnd);
	void CleanupDeviceD3D();
	void CreateRenderTarget();
	void CleanupRenderTarget();
	LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

	// Main code
	int main(int, char**)
	{
	ImGui_ImplWin32_EnableDpiAwareness();

	// Create application window
	//ImGui_ImplWin32_EnableDpiAwareness();
	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 DirectX10 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
	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::StyleColorsClassic();

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

	// Setup Platform/Renderer backends
	ImGui_ImplWin32_Init(hwnd);
	ImGui_ImplDX10_Init(g_pd3dDevice);

	// 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.md' 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_ImplDX10_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
	ImGui::Render();
	g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
	g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
	ImGui_ImplDX10_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
	}

	ImGui_ImplDX10_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_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 \|= D3D10_CREATE_DEVICE_DEBUG;
	if (D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice) != S_OK)
	return false;

	CreateRenderTarget();
	return true;
	}

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

	void CreateRenderTarget()
	{
	ID3D10Texture2D* pBackBuffer;
	g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
	g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView);
	pBackBuffer->Release();
	}

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

	// Forward declare message handler from imgui_impl_win32.cpp
	extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

	// Win32 message handler
	LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
	{
	if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
	return true;

	switch (msg)
	{
	case WM_SIZE:
	if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
	{
	CleanupRenderTarget();
	g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
	CreateRenderTarget();
	}
	return 0;
	case WM_SYSCOMMAND:
	if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
	return 0;
	break;
	case WM_DESTROY:
	::PostQuitMessage(0);
	return 0;
	}
	return ::DefWindowProc(hWnd, msg, wParam, lParam);
	}