#include <windows.h>
#include <scrnsave.h>
#include <commctrl.h>
#include "resource.h"

// Include these libraries

#pragma comment(lib, "ScrnSave.lib")
#pragma comment(lib, "comctl32.lib")

// Screen saver library contains the main function and other
// Startup code required for a scrnsaver user defined vars

#define TIMER 1

// Global variables

int Width, Height;                               // Size of screen variables

// Screensaver procedure...first when window is created:
// 1) get users window resolution
// 2) call a function that sets up OpenGL
// 3) Setup a TIMER that will be used to drive animations

LRESULT WINAPI ScreenSaverProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
      static HDC   hDC;      // Handle to device context
      static HGLRC hRC;      // Handle to OpenGL rendering context
      static RECT  rect;     // Instance of structure RECT which defines the
                             // coords of the upper-left and lower-right
                             // corners of a rectangle

      switch(message)
      {
        // Set timer and any other initializations
        case WM_CREATE:
            GetClientRect(hWnd, &rect);   // Get window dimensions
            Width = rect.right;           // Store width
            Height = rect.bottom;         // Store height
            SetTimer(hWnd, TIMER, 10, NULL);
            return 0;

        case WM_DESTROY:                  // Destroy timer and perform cleanup
            KillTimer(hWnd, TIMER);       // Destroy timer
            return 0;

        case WM_TIMER:                    // Perform drawing operations
            return 0;
      }

      // Unprocessed messages are handled by the screen saver
      // library by calling the following:
      return DefScreenSaverProc(hWnd, message, wParam, lParam);
}


// The system will call the following function when the user is
// in the control panel setting up the screensaver and they
// press the setting button...

BOOL WINAPI ScreenSaverConfigureDialog(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
      // Dialog message handling
      switch(message)
      {
      case WM_COMMAND:
            switch(LOWORD(wParam))
            {
                  case IDOK:
                        EndDialog(hDlg, LOWORD(wParam) == IDOK);
                        return true;

                  case IDCANCEL:
                        EndDialog(hDlg, LOWORD(wParam) == IDOK);
                        return true;
            }
      }
      return false;
}


// The following function registers any nonstandard window
// classes required by the screen saver if the screen saver
// does not require this functionality simply return true

BOOL WINAPI RegisterDialogClasses(HANDLE hInst)
{
      return true;
}