Hi,
Looking att the FrameBufferObjectBase constructor, the _mfDrawBuffers is
actually initialized as empty (size 0), although it looks as if the
constructor tries to add a zero element (which would make sense, use the
window system provided frame buffer to draw to).
Inherited(),
_sfGLId (GLenum(0)),
_mfColorAttachments (),
_mfDrawBuffers (GLenum(0)), <---
_sfDepthAttachment (NULL),
_sfStencilAttachment (NULL),
_sfWidth (UInt16(0)),
_sfHeight (UInt16(0)),
_sfPostProcessOnDeactivate(bool(false))
{ }
The main confusing part here is that _mfColorAttachments is default
initialized, and _mfDrawbuffers is not, but both ctors give the same
effect (empty MField).
I'd expect the _mfDrawBuffers element to contain a zero element, but
that's not what happens. (It's easily fixed by adding a push_back(0) in
FrameBufferObject's ctor)
(Also, the attachment fields are not copied by the copy ctor of FBOBase,
but that's maybe as it should be.)
BTW, I really like the Stage/FBO/FBA/TB/RB classes in 2.x. They beat the
hell out of FBOViewport. :)
Cheers,
/Marcus
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