Re: Draw OpenGLScene without WM_PAINT

Albe wrote:

> Hi all,
> I'm writing a software that receive data to USB ****t and draw
> same graphics in same Windows TAB ( I'm using Visual Studio
> 2003 with MFC ).
> I have to draw the new scene only when the new data on USB ****t
> is available and this data changing is not very fast (400 Hz -
> 400 sample per second), on this I have an issue with the extra
> work to CPU, is always upper than 90% probably because the
> WM_PAINT is so fast and the software draws continuosly the same
> scene between two sample to USB ****t.
> 
> To solve this issue I tried to eliminate the WM_PAINT in OpenGL
> and call the OpenGL::OnPaint only when the new data occours but
> the window's device context is 0 and I don't understand why.
> 
> Cau yuo help me?

I don't know (anymore) why the DC in a manually issuied WM_PAINT
may be 0, however rest assured, that it doesn't matter to you:

Once created, the OpenGL context is independent of any DC, you
just have to make sure it's been made current (wglMakeCurrent).
Then you may use the context (i.e. render stuff) whenever you
see fit.

Wolfgang Draxinger
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