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C-/C++-Quelltext

//Spielteil:

void CEngine::MainGame()
{
     
  // check of user is trying to exit

 if (KEY_DOWN(VK_ESCAPE) || KEY_DOWN(VK_SPACE))
    {
     MessageBox(main_window_handle, "Spiel wurde unterbrochen!", "Spiel wird beendet!", MB_OK);
     PostMessage(main_window_handle, WM_DESTROY,0,0);
    }
     
 // this is the workhorse of your game it will be called

 // continuously in real-time this is like main() in C

 // all the calls for you game go here!


 USHORT *back_buffer = NULL, // used to draw

        *dest_ptr    = NULL, // used in line by line copy

        *src_ptr     = NULL; // " "


 // erase secondary back buffer

 memset(&ddsd,0,sizeof(ddsd));
 ddsd.dwSize = sizeof(ddsd);

 // lock the secondary surface

 lpddsback->Lock(NULL,&ddsd,
                 DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT,NULL);

 // get video pointer to secondary surface

 back_buffer = (USHORT *)ddsd.lpSurface;     

 // clear back buffer out, remember in 16bit mode there are

 // 2 bytes per pixel, so watch out for addressing and multiplying

 // issues in this code


 // linear memory

 if (ddsd.lPitch == SCREEN_WIDTH*2)
     memset(back_buffer,0,SCREEN_WIDTH*SCREEN_HEIGHT*(SCREEN_BPP/8));
 else
    {
    // non-linear memory

   
    // make copy of video pointer

    dest_ptr = back_buffer;

    // clear out memory one line at a time

    for (int y=0; y < SCREEN_HEIGHT; y++)
        {
        // clear next line

        memset(dest_ptr,0,SCREEN_WIDTH*(SCREEN_BPP/8));
       
        // advance pointer to next line

        dest_ptr+=(ddsd.lPitch/2);

        } // end for y


    } // end else


 // perform game logic...

       
 // draw the next frame into the secondary back buffer

 // plot 5000 random pixels

 for (unsigned int index = 0; index < 5000; index++)
     {
     int   x     = rand()%SCREEN_WIDTH;
     int   y     = rand()%SCREEN_HEIGHT;

     UCHAR red   = rand()%256;
     UCHAR green = rand()%256;
     UCHAR blue  = rand()%256;
   
     // back_buffer is a short pointer, BUT lpitch is in bytes

     // so divide by 2, to get number of "pixels" or words

     back_buffer[x+y*(ddsd.lPitch/2)] = _RGB16BIT565(red, green, blue);
     } // end for index


 // unlock secondary buffer

 lpddsback->Unlock(NULL);

 // flip pages

 if(lpddsprimary->Flip(NULL, DDFLIP_WAIT)!=DD_OK)
 {
  MessageBox(main_window_handle,"Es gab einen Fehler beim flippen!", "Flipping Fehler!",MB_OK);
  PostMessage(main_window_handle, WM_DESTROY,0,0);
 }
}