Hi everyone!
Is it possible to draw an overlay using opengl?
what I wan’t to do is draw over a window where graphics is already drawed, so I don’t want to use opengl in that actual window. you get it?
I’m an opengl newbie myself, first post and all, but I did something like this awhile back.
Only way I could find at the time was :
1.) grab a handle to the window you need to draw on
2.) either use setpixel (slow)
3.) getpixel works (slow)
4.) BitBlt works as well, to and from a memDC
so as to printing out a window inside an already open , OpenGL window… I guess you could either ‘create’ a window lookalike on the current hdc, or memDC, and bitblt it over… it’s not that slow…
well, hope I helped a little…
D
oops!!
I forgot to mention the flicker. If you decide to try that, the screen where you are drawing on the OpenGL window, will flicker… Due to buffering. Wish I knew how to fix that, but it’s been awhile since I messed with it.
Maybe some sort of buffer, have no idea how to access the opengl buffer. If anyone else knows that , I myself would be happy to see it work 
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