hi to all.
i heavily use fake FBOs ( setFBOOn( false ) ).
the problem is that i expect that fake FBOs, as they inherit from
Viewport, behaves like Viewports when i resize them ( setSize() ).
Instead, i discovered that FBOs do this:
Window *win = action->getWindow();
// Let the window handle resizes, to avoid interfering with the
// FBOViewports settings
win->resizeGL();
before each render. this basically does glViewport() using full window
size... but if i did setSize to render on a sub-portion of screen, it is
ignored and the content are rendered on the full window.
there are two possible solutions to this problem:
1 - don't use fake fbo, use true ones.
2 - let setFBOOn(false) interfere with FBOViewports settings
+ solution 1 has the drawback that i have to replicate a lot of code to
support video cards on which FBOs don't work, using big IFs
+ solution 2 has the drawback that it is not semantically consistent
with FBOs (that doesn't support offsets), but is semantically consistent
with the Viewport concept, from which OpenSG derives FBOs...
so, maybe for lazyness, i prefer solution 2. What do you think?
thanks for your time
Francesco
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