Передача hdc в функцию

case WM_PAINT:
        {
            // Get dc here
            hdc = GetDC(hWnd);
 
            // Create a backbuffer here 
            bdc = CreateCompatibleDC(hdc);
 
            // Get the screen dimensions
            RECT client;
            GetClientRect(hWnd, &client);
 
            // Create bitmap
            HBITMAP backBuffer = CreateCompatibleBitmap(hdc, client.right - client.left, client.bottom - client.top);
 
            // Release it, because we no longer need it
            hdc = NULL;
            ReleaseDC(hWnd, hdc);           
 
            // Select the back dc as a current one and specify the screen dimensions
            HPEN hPen = CreatePen(PS_SOLID, 1, RGB(0, 25, 205));
            HBRUSH hBrush = CreateSolidBrush(RGB(0, 0, 55));
 
            SelectObject(bdc, hPen);
            SelectObject(bdc, hBrush);
            SelectObject(bdc, backBuffer);
 
            Rectangle(bdc, client.left, client.top, client.right, client.bottom);
 
            POINT points[3];
            Face vertexFace;
            clock_t t1, t2;
            t1 = clock();
            
            for (unsigned i = 0; i < model->vertexFaces.size(); i++)
            {
                // Here we convert our points to Clip and Windowed Coordinates
                // and only then fetch the results
                if (Algorithms::FetchPolygons(&model->finalizedVertices[0], model->vertexFaces[i], points))
                {
                    //Polygon(bdc, points, 3);
                    func_threads.at(0) = thread(anyFunc2, bdc);
                }
            }
 
            t2 = clock();
            long elapsed = timediff(t1, t2);
 
 
            for (unsigned i = 0; i < func_threads.size(); i++)
            {
                //if (func_threads[i].joinable()) func_threads[i].join();
            }
            
            // Swap buffers     
            hdc = BeginPaint(hWnd, &ps);
            BitBlt(hdc, client.left, client.top, client.right, client.bottom, bdc, 0, 0, SRCCOPY);
            EndPaint(hWnd, &ps);
 
            // Delete all created objects from memory
            DeleteObject(backBuffer);
            DeleteObject(hBrush);
            DeleteObject(hPen);
            DeleteDC(bdc);
            break;
        }

case WM_PAINT:
{
    // Get dc here
    hdc = GetDC(hWnd);
 
    // Create a backbuffer here 
    bdc = CreateCompatibleDC(hdc);
 
    // Get the screen dimensions
    RECT client;
    GetClientRect(hWnd, &client);
 
    // Create bitmap
    HBITMAP backBuffer = CreateCompatibleBitmap(hdc, client.right - client.left, client.bottom - client.top);
 
    // Release it, because we no longer need it
    hdc = NULL;
    ReleaseDC(hWnd, hdc);           
 
    // Select the back dc as a current one and specify the screen dimensions
    HPEN hPen = CreatePen(PS_SOLID, 1, RGB(0, 25, 205));
    HBRUSH hBrush = CreateSolidBrush(RGB(0, 0, 55));
 
    SelectObject(bdc, hPen);
    SelectObject(bdc, hBrush);
    SelectObject(bdc, backBuffer);
 
    Rectangle(bdc, client.left, client.top, client.right, client.bottom);
    
    // Call some threads to draw polygons on our BDC
    for (unsigned i = 0; i < func_threads.size(); i++)
    {
        func_threads.at(i) = thread(anyFunс2, bdc, i);
    }
    
    // Wait until all threads finish their job
    for (unsigned i = 0; i < func_threads.size(); i++)
    {
        if (func_threads[i].joinable()) func_threads[i].join();
    }
 
    // Swap buffers     
    hdc = BeginPaint(hWnd, &ps);
    BitBlt(hdc, client.left, client.top, client.right, client.bottom, bdc, 0, 0, SRCCOPY);
    EndPaint(hWnd, &ps);
 
    // Delete all created objects from memory
    DeleteObject(backBuffer);
    DeleteObject(hBrush);
    DeleteObject(hPen);
    DeleteDC(bdc);
    break;
}

void anyFunс2(HDC dc, int index)
{
    POINT points[3];
 
    for (unsigned i = index; i < model->vertexFaces.size(); i += fs)
    {
        // Here we convert our points to Clip and Windowed Coordinates
        // and only then fetch the results
        if (Algorithms::FetchPolygons(&model->finalizedVertices[0], model->vertexFaces[i], points))
        {
            Polygon(dc, points, 3);
        }
    }
}