#include
     
       #define WINDOW_CLASS "UGPDX" #define WINDOW_NAME  "Drawing a Quad" // Function Prototypes... bool InitializeD3D(HWND hWnd, bool fullscreen); bool InitializeObjects(); void RenderScene(); void Shutdown(); // Direct3D object and device. LPDIRECT3D9 g_D3D = NULL; LPDIRECT3DDEVICE9 g_D3DDevice = NULL; // Vertex buffer to hold the geometry. LPDIRECT3DVERTEXBUFFER9 g_VertexBuffer = NULL; // A structure for our custom vertex type struct stD3DVertex {
    float x, y, z, rhw;     unsigned long color; }; // Our custom FVF, which describes our custom vertex structure #define D3DFVF_VERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE) LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch(msg)       {
    case WM_DESTROY:             PostQuitMessage(0); return 0; break; case WM_KEYUP: if(wParam == VK_ESCAPE) PostQuitMessage(0); break;       } return DefWindowProc(hWnd, msg, wParam, lParam); } int WINAPI WinMain(HINSTANCE hInst, HINSTANCE prevhInst, LPSTR cmdLine, int show) {
    // Register the window class    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,                      WINDOW_CLASS, NULL };    RegisterClassEx(&wc); // Create the application's window    HWND hWnd = CreateWindow(WINDOW_CLASS, WINDOW_NAME, WS_OVERLAPPEDWINDOW, 100, 100, 640, 480, GetDesktopWindow(), NULL,                             wc.hInstance, NULL); // Initialize Direct3D    if(InitializeD3D(hWnd, false))       {
    // Show the window          ShowWindow(hWnd, SW_SHOWDEFAULT);          UpdateWindow(hWnd); // Enter the message loop          MSG msg;          ZeroMemory(&msg, sizeof(msg)); while(msg.message != WM_QUIT)             {
    if(PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))                   {
                         TranslateMessage(&msg);                      DispatchMessage(&msg);                   } else                   RenderScene();             }       } // Release any and all resources.    Shutdown(); // Unregister our window.    UnregisterClass(WINDOW_CLASS, wc.hInstance); return 0; } bool InitializeD3D(HWND hWnd, bool fullscreen) {
       D3DDISPLAYMODE displayMode; // Create the D3D object.    g_D3D = Direct3DCreate9(D3D_SDK_VERSION); if(g_D3D == NULL) return false; // Get the desktop display mode.    if(FAILED(g_D3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &displayMode))) return false; // Set up the structure used to create the D3DDevice    D3DPRESENT_PARAMETERS d3dpp;    ZeroMemory(&d3dpp, sizeof(d3dpp)); if(fullscreen)       {
             d3dpp.Windowed = FALSE;          d3dpp.BackBufferWidth = 640;          d3dpp.BackBufferHeight = 480;       } else       d3dpp.Windowed = TRUE;    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;    d3dpp.BackBufferFormat = displayMode.Format; // Create the D3DDevice    if(FAILED(g_D3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,              D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &g_D3DDevice)))       {
    return false;       } // Initialize any objects we will be displaying.    if(!InitializeObjects()) return false; return true; } bool InitializeObjects() {
    // Fill in our structure to draw an object. // x, y, z, rhw, color.    stD3DVertex objData[] =       {
             { 420, 150, 0.5f, 1, D3DCOLOR_XRGB(255, 255, 255), },          { 420, 350, 0.5f, 1, D3DCOLOR_XRGB(255, 255, 255), },          { 220, 150, 0.5f, 1, D3DCOLOR_XRGB(255, 255, 255), },          { 220, 350, 0.5f, 1, D3DCOLOR_XRGB(255, 255, 255), },       }; // Create the vertex buffer.    if(FAILED(g_D3DDevice->CreateVertexBuffer(sizeof(objData), 0, D3DFVF_VERTEX, D3DPOOL_DEFAULT, &g_VertexBuffer,       NULL))) return false; // Fill the vertex buffer.    void *ptr; if(FAILED(g_VertexBuffer->Lock(0, sizeof(objData),       (void**)&ptr, 0))) return false;    memcpy(ptr, objData, sizeof(objData));    g_VertexBuffer->Unlock(); return true; } void RenderScene() {
    // Clear the backbuffer.    g_D3DDevice->Clear(0, NULL, D3DCLEAR_TARGET,                       D3DCOLOR_XRGB(0,0,255), 1.0f, 0); // Begin the scene.  Start rendering.    g_D3DDevice->BeginScene(); // Render quad.       g_D3DDevice->SetStreamSource(0, g_VertexBuffer, 0, sizeof(stD3DVertex));       g_D3DDevice->SetFVF(D3DFVF_VERTEX);       g_D3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2); // End the scene.  Stop rendering.    g_D3DDevice->EndScene(); // Display the scene.    g_D3DDevice->Present(NULL, NULL, NULL, NULL); } void Shutdown() {
    if(g_D3DDevice != NULL) g_D3DDevice->Release(); if(g_D3D != NULL) g_D3D->Release(); if(g_VertexBuffer != NULL) g_VertexBuffer->Release();    g_D3DDevice = NULL;    g_D3D = NULL;    g_VertexBuffer = NULL; }