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Diffstat (limited to 'lib/imgui-1.90.7/examples/example_win32_directx11/main.cpp')
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1 files changed, 274 insertions, 0 deletions
diff --git a/lib/imgui-1.90.7/examples/example_win32_directx11/main.cpp b/lib/imgui-1.90.7/examples/example_win32_directx11/main.cpp new file mode 100644 index 0000000..5285df1 --- /dev/null +++ b/lib/imgui-1.90.7/examples/example_win32_directx11/main.cpp @@ -0,0 +1,274 @@ +// Dear ImGui: standalone example application for DirectX 11 + +// 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_win32.h" +#include "imgui_impl_dx11.h" +#include <d3d11.h> +#include <tchar.h> + +// Data +static ID3D11Device* g_pd3dDevice = nullptr; +static ID3D11DeviceContext* g_pd3dDeviceContext = nullptr; +static IDXGISwapChain* g_pSwapChain = nullptr; +static bool g_SwapChainOccluded = false; +static UINT g_ResizeWidth = 0, g_ResizeHeight = 0; +static ID3D11RenderTargetView* g_mainRenderTargetView = nullptr; + +// 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**) +{ + // Create application window + //ImGui_ImplWin32_EnableDpiAwareness(); + WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr }; + ::RegisterClassExW(&wc); + HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX11 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr); + + // Initialize Direct3D + if (!CreateDeviceD3D(hwnd)) + { + CleanupDeviceD3D(); + ::UnregisterClassW(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::StyleColorsLight(); + + // Setup Platform/Renderer backends + ImGui_ImplWin32_Init(hwnd); + ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext); + + // 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 a nullptr. 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. + // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering. + // - 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("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f); + //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese()); + //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 messages (inputs, window resize, etc.) + // See the WndProc() function below for our to dispatch events to the Win32 backend. + MSG msg; + while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE)) + { + ::TranslateMessage(&msg); + ::DispatchMessage(&msg); + if (msg.message == WM_QUIT) + done = true; + } + if (done) + break; + + // Handle window being minimized or screen locked + if (g_SwapChainOccluded && g_pSwapChain->Present(0, DXGI_PRESENT_TEST) == DXGI_STATUS_OCCLUDED) + { + ::Sleep(10); + continue; + } + g_SwapChainOccluded = false; + + // Handle window resize (we don't resize directly in the WM_SIZE handler) + if (g_ResizeWidth != 0 && g_ResizeHeight != 0) + { + CleanupRenderTarget(); + g_pSwapChain->ResizeBuffers(0, g_ResizeWidth, g_ResizeHeight, DXGI_FORMAT_UNKNOWN, 0); + g_ResizeWidth = g_ResizeHeight = 0; + CreateRenderTarget(); + } + + // Start the Dear ImGui frame + ImGui_ImplDX11_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 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()); + + // Present + HRESULT hr = g_pSwapChain->Present(1, 0); // Present with vsync + //HRESULT hr = g_pSwapChain->Present(0, 0); // Present without vsync + g_SwapChainOccluded = (hr == DXGI_STATUS_OCCLUDED); + } + + // Cleanup + ImGui_ImplDX11_Shutdown(); + ImGui_ImplWin32_Shutdown(); + ImGui::DestroyContext(); + + CleanupDeviceD3D(); + ::DestroyWindow(hwnd); + ::UnregisterClassW(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 |= 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; + + 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; } +} + +// 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 +// 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. +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 (wParam == SIZE_MINIMIZED) + return 0; + g_ResizeWidth = (UINT)LOWORD(lParam); // Queue resize + g_ResizeHeight = (UINT)HIWORD(lParam); + 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 ::DefWindowProcW(hWnd, msg, wParam, lParam); +} |