游戏入门引擎代码

头文件 GameEngine.h

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#pragma once
#include 

int WINAPI              WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow);
LRESULT CALLBACK        WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

bool GameInitialize(HINSTANCE hInstance);
void GameStart(HWND hWnd);
void GameEnd();
void GameActive(HWND hWnd);
void GameDeactive(HWND hWnd);
void GamePaint(HDC hdc);
void GameCycle();

class GameEngine
{
public:
    GameEngine(HINSTANCE hInstance, LPTSTR szWindowClass, LPTSTR szTitle, WORD wIcon, WORD wSmallIcon, int iWidth = 640, int iHeight = 480);
    virtual             ~GameEngine();
    //////////////////////////////////////////////////////////////////////////
    static GameEngine*  GetEngine(){ return m_pGameEngine; }
    static void         SetEngine(GameEngine* pGameEngine){ m_pGameEngine = pGameEngine; }
    BOOL                Initialize(int iCmdShow);
    LRESULT             HandleEvent(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
    //////////////////////////////////////////////////////////////////////////
    HINSTANCE           GetInstance(){ return m_hInstance; }
    HWND                GetWnd(){ return m_hWnd; }
    void                SetWnd(HWND hWnd){ m_hWnd = hWnd; }
    LPTSTR              GetTitle(){ return m_szTitle; }
    WORD                GetIcon(){ return m_wIcon; }
    WORD                GetSmallIcon(){ return m_wSmallIcon; }
    int                 GetWidth(){ return m_iWidth; }
    int                 GetHeight(){ return m_iHeight; }
    int                 GetFrameDelay(){ return m_iFrameDelay; }
    void                SetFrameRate(int iFrameRate){ m_iFrameDelay = 1000 / iFrameRate; }
    BOOL                GetSleep(){ return m_bSleep; }
    void                SetSleep(BOOL bSleep){ m_bSleep = bSleep; }
private:

protected:
    static GameEngine*  m_pGameEngine;
    HINSTANCE           m_hInstance;            //应用程序句柄
    HWND                m_hWnd;                 //主窗口句柄
    TCHAR               m_szWindowClass[32];    //窗口类名称
    TCHAR               m_szTitle[32];          //主窗口名称
    WORD                m_wIcon, m_wSmallIcon;  //程序图标
    int                 m_iWidth, m_iHeight;    //宽 高
    int                 m_iFrameDelay;          //周期
    BOOL                m_bSleep;               //是否休眠
};

源文件GameEngine.cpp

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#include "stdafx.h"
#include "GameEngine.h"

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    MSG         msg;
    static int  iTickTrigger = 0;
    int         iTickCount;

    if (GameInitialize(hInstance))
    {
        if (!GameEngine::GetEngine()->Initialize(iCmdShow))
        {
            return FALSE;
        }

        while (true)
        {
            if (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE))
            {
                if (msg.message == WM_QUIT)
                    break;
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
            else
            {
                if (!GameEngine::GetEngine()->GetSleep())
                {
                    iTickCount = GetTickCount();
                    if (iTickCount > iTickTrigger)
                    {
                        iTickTrigger = iTickCount + GameEngine::GetEngine()->GetFrameDelay();
                        GameCycle();
                    }
                }
            }
        }
        return (int)msg.wParam;
    }
    GameEnd();
    return TRUE;
}


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    return GameEngine::GetEngine()->HandleEvent(hWnd, message, wParam, lParam);
}



GameEngine::GameEngine(HINSTANCE hInstance, LPTSTR szWindowClass, LPTSTR szTitle, WORD wIcon, WORD wSmallIcon, int iWidth, int iHeight) :
m_hInstance(hInstance),
m_wIcon(wIcon),
m_wSmallIcon(wSmallIcon),
m_iWidth(iWidth),
m_iHeight(iHeight),
m_iFrameDelay(50),
m_bSleep(TRUE),
m_hWnd(nullptr)
{
    memcpy(m_szWindowClass, szWindowClass, strlen(szWindowClass));
    memcpy(m_szTitle, szTitle, strlen(szTitle));
}

GameEngine::~GameEngine()
{
}

BOOL GameEngine::Initialize(int iCmdShow)
{
    WNDCLASSEX wndclass;
    wndclass.cbSize         = sizeof(wndclass);
    wndclass.style          = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc    = WndProc;
    wndclass.cbClsExtra     = 0;
    wndclass.cbWndExtra     = 0;
    wndclass.hInstance      = m_hInstance;
    wndclass.hIcon          = LoadIcon(m_hInstance, MAKEINTRESOURCE(GetIcon()));
    wndclass.hIconSm        = LoadIcon(m_hInstance, MAKEINTRESOURCE(GetSmallIcon()));
    wndclass.hCursor        = LoadCursor(nullptr, IDC_ARROW);
    wndclass.hbrBackground  = (HBRUSH)(COLOR_WINDOW + 1);
    wndclass.lpszMenuName   = nullptr;
    wndclass.lpszClassName  = m_szWindowClass;

    if (!RegisterClassEx(&wndclass))
    {
        return FALSE;
    }

    //根据game大小计算窗口大小和位置
    int iWindowWidth    = m_iWidth + GetSystemMetrics(SM_CXFIXEDFRAME) * 2;
    int iWindowHeight   = m_iHeight + GetSystemMetrics(SM_CYFIXEDFRAME) * 2 + GetSystemMetrics(SM_CYCAPTION);
    if (wndclass.lpszMenuName != nullptr)
    {
        iWindowHeight   += GetSystemMetrics(SM_CYMENU);
    }
    int iXWindowPos     = (GetSystemMetrics(SM_CXSCREEN) - iWindowWidth) / 2;
    int iYWindowPos     = (GetSystemMetrics(SM_CYSCREEN) - iWindowHeight) / 2;

    m_hWnd  = CreateWindow(m_szWindowClass, m_szTitle, WS_POPUPWINDOW | WS_CAPTION | WS_MINIMIZEBOX, iXWindowPos, iYWindowPos, iWindowWidth, iWindowHeight, nullptr, nullptr, m_hInstance, nullptr);
    if (!m_hWnd)
    {
        return FALSE;
    }

    ShowWindow(m_hWnd, iCmdShow);
    UpdateWindow(m_hWnd);
    return TRUE;
}

LRESULT GameEngine::HandleEvent(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_CREATE:
        SetWnd(hWnd);
        GameStart(hWnd);
        return 0;
    case WM_SETFOCUS:
        GameActive(hWnd);
        SetSleep(FALSE);
        return 0;
    case WM_KILLFOCUS:
        GameDeactive(hWnd);
        SetSleep(TRUE);
        return 0;
    case WM_PAINT:
        HDC         hdc;
        PAINTSTRUCT ps;
        hdc = BeginPaint(hWnd, &ps);
        GamePaint(hdc);
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        GameEnd();
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hWnd, msg, wParam, lParam);
}

__declspec(selectany) GameEngine* GameEngine::m_pGameEngine = nullptr;

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