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Task switching doesn't change window resolution

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I've used the Windows OpenGL tutorial on Nehe to create my OpenGL window. The problem is that whenever I task switch (ALT + TAB) while my window is in fullscreen mode, the screen resolution does not change. Right now my application is in 640x480 mode and whenever I alt tab out, the resolution stays the same. Any ideas?

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You have to change back to desktop resolution yourself in your program.
That's not so easy I think, (I don't know which NEHE you are talking about, win32/glut?)
In win32 I think you have to do it in WM_ACTIVATE message somehow.

I use this code:
{ int _active,_minimized;

_active = LOWORD(wParam);
_minimized = (BOOL) HIWORD(wParam);

if (_active && !_minimized)
{ win_state.Active = true;
SetForegroundWindow( hWnd );
ShowWindow(hWnd, SW_RESTORE );

changeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN);//just like in your window creation
{ win_state.Active = false;

ChangeDisplaySettings(NULL,0);//I'm not sure about this one

return DefWindowProc(hWnd,uMsg,wParam,lParam);
I'm not sure it is the proper way.

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this is very slow.
Faster if you set the resolution with changeDisplaySettings(&dmDesktopSettings,CDS_FULLSCREEN);
in the else state too. You have to query the setting at startup of course.But how to do that?

EDIT: for example:
GetWindowRect(GetDesktopWindow(), &WindowRect);//RECT WindowRect

[Edited by - szecs on November 2, 2009 8:51:05 AM]

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