接下來我們寫一個主函數，調用系統來創建我們需要的demo展示。 main.cpp #include <windows.h> #include <windowsx.h> #include <memory> #include <string> #include <iostream> #include "BoxDemo.h" #include "MMath.h" #pragma comment(lib, "winmm.lib") using namespace std; HINSTANCE g_hInstance; //實例句柄 static HWND g_hWnd; //窗口句柄 string g_title = "Moe3D"; //窗口標題 int g_width = 800; //窗口大小 int g_height = 600; shared_ptr<BoxDemo> g_pBoxDemo = make_shared<BoxDemo>(); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); WNDCLASSEX wcex; wcex.cbClsExtra = 0; wcex.cbSize = sizeof(wcex); wcex.cbWndExtra = 0; wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); wcex.hCursor = LoadCursor(nullptr, IDC_ARROW); wcex.hIcon = LoadIcon(nullptr, IDI_WINLOGO); wcex.hIconSm = wcex.hIcon; wcex.hInstance = g_hInstance; wcex.lpfnWndProc = WndProc; wcex.lpszClassName = g_title.c_str(); wcex.lpszMenuName = nullptr; wcex.style = CS_HREDRAW | CS_VREDRAW; if (!RegisterClassEx(&wcex)) return 0; RECT rc = { 0, 0, 800, 600 }; AdjustWindowRect(&rc, WS_OVERLAPPEDWINDOW, false); HWND g_hWnd = CreateWindowEx(WS_EX_APPWINDOW,g_title.c_str(), g_title.c_str(), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, rc.right - rc.left, rc.bottom - rc.top, nullptr, nullptr, g_hInstance, nullptr); if (!g_hWnd) { MessageBox(nullptr, "create window failed!", "error", MB_OK); return 0; } ShowWindow(g_hWnd, nShowCmd); MSG msg; ZeroMemory(&msg, sizeof(msg)); while (msg.message != WM_QUIT) { if (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); } else { g_pBoxDemo->Update(0.f); g_pBoxDemo->Render(); InvalidateRect(g_hWnd, nullptr, true); UpdateWindow(g_hWnd); } } return static_cast<int>(msg.wParam); } LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; //雙緩沖繪圖 static BITMAPINFO s_bitmapInfo; static HDC s_hdcBackbuffer; //后緩沖設備句柄 static HBITMAP s_hBitmap; static HBITMAP s_hOldBitmap; static void* s_pData; switch (message) { case WM_CREATE: { g_pBoxDemo->Init(g_hInstance, hWnd); //初始化設備無關位圖header BITMAPINFOHEADER bmphdr = { 0 }; bmphdr.biSize = sizeof(BITMAPINFOHEADER); bmphdr.biWidth = g_width; bmphdr.biHeight = -g_height; bmphdr.biPlanes = 1; bmphdr.biBitCount = 32; bmphdr.biSizeImage = g_height * g_width * 4; //創建后緩沖區 //先創建一個內存dc s_hdcBackbuffer = CreateCompatibleDC(nullptr); //獲得前置緩沖區dc HDC hdc = GetDC(hWnd); if (!(s_hBitmap = CreateDIBSection(nullptr, (PBITMAPINFO)&bmphdr, DIB_RGB_COLORS, reinterpret_cast<void**>(&g_pBoxDemo->GetDevice()->GetFrameBuffer()), nullptr, 0))) { MessageBox(nullptr, "create dib section failed!", "error", MB_OK); return 0; } //將bitmap裝入內存dc s_hOldBitmap = (HBITMAP)SelectObject(s_hdcBackbuffer, s_hBitmap); //釋放dc ReleaseDC(hWnd, hdc); } break; case WM_PAINT: { hdc = BeginPaint(hWnd, &ps); //把backbuffer內容傳到frontbuffer BitBlt(ps.hdc, 0, 0, g_width, g_height, s_hdcBackbuffer, 0, 0, SRCCOPY); EndPaint(hWnd, &ps); } break; case WM_DESTROY: SelectObject(s_hdcBackbuffer, s_hOldBitmap); DeleteDC(s_hdcBackbuffer); DeleteObject(s_hOldBitmap); PostQuitMessage(0); break; //禁止背景擦除 防止閃爍 case WM_ERASEBKGND: return true; break; //鼠標事件 //鼠標被按下時 case WM_LBUTTONDOWN: case WM_MBUTTONDOWN: case WM_RBUTTONDOWN: g_pBoxDemo->OnMouseDown(wParam, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)); return 0; //鼠標釋放時 case WM_LBUTTONUP: case WM_MBUTTONUP: case WM_RBUTTONUP: g_pBoxDemo->OnMouseUp(wParam, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)); return 0; //鼠標移動時 case WM_MOUSEMOVE: g_pBoxDemo->OnMouseMove(wParam, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)); return 0; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } 至此，已經全部結束，我們可以運行，查看一下效果。 就渲染個阿童木吧，效果如下： 在轉動時，由于是CPU模擬GPU的軟渲染，沒使用相關硬件，因此可以感覺到卡頓，有時間我們繼續優化。