I am trying to display objects in transparent windows (similar to the
BoingX sample) but using Carbon's
CreateNewWindow (kOverlayWindowClass, ...)
I show the window, create a Context {AGL_RGBA, AGL_DOUBLEBUFFER,
AGL_DEPTH_SIZE 32, AGL_NONE} and set it's drawable to be the overlay
window. Finally, I paint some polygon and swap buffers.
At first this seems to work, yay. My polygon shows up on the screen
without any visible trace of a window. Now the problem begins. I need
this polygon-in-overlay-window as drag and drop feedback. In other
words I have to move this window. Done similar things before with
QuickDraw and QuickTime painting into overlay windows. That worked. But
with with OpenGL-based painting the desktop background behind my
overlay seems be copied into the overlay. As I move the window the
desktop region originally covered by the window moves with the window.
I am guessing this has something to do with double buffering but then
again this problem manifests itself even before I ever do an
aglSwapbuffers. Is there some other property I need to set with the
overlay window or the OpenGL content?
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