Избавиться от статических переменных

#include <Windows.h>
#include "resource.h"
 
LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);
 
HINSTANCE hInst;
 
HMENU hPopUpMenu;
 
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    hInst=hInstance;
    WNDCLASS wc = {0};
    wc.lpfnWndProc   = WindowProc;
    wc.hInstance     = hInst;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "ahuasauhgaodaoaafafaagafagalakjafagafafaafajafagaaflkafgaafagagafagajhafagjhgafagjhga";
    
    if (RegisterClass(&wc) == 0 )
    return -1;
 
    HWND hwndWindow = CreateWindow(wc.lpszClassName,"Smile",
                WS_OVERLAPPEDWINDOW,      
                10,10,500,500,NULL,NULL,hInstance,NULL);
 
    hPopUpMenu=CreatePopupMenu();
    
    char string [20];
    
    for(int i=1;LoadString(hInstance, i, string, sizeof(string));i++)
        {
            AppendMenu(hPopUpMenu,MF_STRING,i,string);
        }
 
    AppendMenu(hPopUpMenu,MF_SEPARATOR,NULL,0);
    AppendMenu(hPopUpMenu,MF_STRING,IDB_BITMAP1,"one");
    AppendMenu(hPopUpMenu,MF_STRING,IDB_BITMAP2,"two");
 
    ShowWindow(hwndWindow, nCmdShow);
    UpdateWindow(hwndWindow);
 
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
            DispatchMessage(&msg);
 
    
 
 
    return 0;
}
 
LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    static int xPos =0;
    static int yPos=0;
    HBITMAP hBitmap;
    HBRUSH hBrush;
    switch (uMsg) {
    case WM_CREATE:
        {
            hBitmap = LoadBitmap (hInst,MAKEINTRESOURCE(IDB_BITMAP1));
            hBrush  = CreatePatternBrush (hBitmap);
            SetClassLong (hwnd, GCL_HBRBACKGROUND,(LONG) hBrush);
            break;
        }
    case WM_COMMAND:
        {
    
        int ID = LOWORD (wParam);
        char string [20];
 
        
        switch (ID)
            {
            case IDB_BITMAP1:
                DeleteObject (hBrush);
                hBitmap = LoadBitmap (hInst,MAKEINTRESOURCE(IDB_BITMAP1));
                hBrush  = CreatePatternBrush (hBitmap);
                SetClassLong (hwnd, GCL_HBRBACKGROUND,(LONG) hBrush) ;
                break;
 
            case IDB_BITMAP2:
                DeleteObject (hBrush);
                hBitmap = LoadBitmap (hInst,MAKEINTRESOURCE(IDB_BITMAP2));
                hBrush  = CreatePatternBrush (hBitmap);
                SetClassLong (hwnd, GCL_HBRBACKGROUND,(LONG) hBrush) ;
                break;      
            default:
            {
                LoadString(hInst, ID, string, sizeof(string));
                SetWindowText(hwnd,string);
                SetClassLong (hwnd, GCL_HBRBACKGROUND,(LONG) hBrush) ;      
            }
            }
        InvalidateRect(hwnd,NULL,TRUE);
        UpdateWindow(hwnd);
 
 
    break;
        }
    case WM_MOVE:
        xPos = (int)(short) LOWORD(lParam);  
        yPos = (int)(short) HIWORD(lParam);  
        break;
    
    case WM_RBUTTONDOWN:
        {   
        RECT rect;
        GetClientRect(hwnd, &rect);
        POINT pt;
        pt.x = LOWORD(lParam);
        pt.y = HIWORD(lParam);
        ClientToScreen(hwnd, &pt);
        TrackPopupMenu (hPopUpMenu,TPM_CENTERALIGN,pt.x,pt.y, 0,hwnd, &rect) ;
        break;
        }
    case WM_DESTROY:
        DeleteObject (hBrush);
        PostQuitMessage(0);
        return 0;
    default: return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
 
    DeleteObject (hBitmap);
    return 0;
}