Hello all-
I have an OpenGL canvas that I am drawing to, and I want to use a
wx.GraphicsContext to draw an overlay on top of it (particularly,
because drawing text in OpenGL is always a bit of a chore). I was able
to get it to work, however, there is some pretty unacceptable flicker
caused when I update the underlying OpenGL canvas.
I have disabled the screen erasing (by binding a trivial method to
wx.EVT_ERASE_BACKGROUND), but of course, the canvas is erased during
OpenGL drawing. Does anyone have any idea how to eliminate this
flicker? Or have a nice, cross-platform method to draw decent looking
text (i.e. in system fonts) on top of an OpenGL canvas?
Or have a nice, cross-platform method to draw decent looking
text (i.e. in system fonts) on top of an OpenGL canvas?
Can you draw the text to a transparent bitmap with DC or Graphicscontext, then put that bitmap onto OpenGL as a texture?
This is working for us in a limited case, but we hope to do more with it.
For instance, you can use wxHTML to render to an off-screen bitmap, then put that in OPenGL as a texture, giving you a way to render formated text.
I'm hoping something similar can be done with wxRichTextCtrl, but I'm not sure it can be used with only an off-screen bitmap.
-Chris
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Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
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