Hi Stephan So a little testing has reveled that when using a framebuffer object a call to glFrameBufferRenderBuffer is made in FrameBufferAttachment::attach in FrameBufferObject.cpp (starts line 541). But this is also done in createFrameBuffer in GraphicsWindowIPhone.mm with the created _viewFrameBuffer. So I have a feeling we are ending up with two RenderFrameBuffers the one that GraphicsWindowIPhone is trying to display isn't actually drawn to. I'm gonna dig for calls to glGenFrameBuffers to see if a separate renderbufferframebuffer is being created.
Does anybody reading this have a better understanding of what is happening with the renderbufferframebuffer when using a framebufferobject? Cheers Tom On 3 November 2010 16:45, Thomas Hogarth <[email protected]>wrote: > Hi Stephan, Robert > > >> >> With the svn/trunk version of the OSG GLU has been directly integrated >> and should be fully supported under OpenGLES code paths. The IPhone >> git branch may well not have these changes yet. >> >> > Sounds great will defo check that out > > >> >> Updating ShaderGen to work with GLES2 would be very useful. >> >> > i'll get onto this today. I've already made a version in my own code that > also adds texture matrices etc. So i'll put back into the shader gen and see > what I can do about the fixed function features being used. > > >> >> @Tom: does FBOs work on your end now? If yes, please send me your >> sources, so I can integrate them with the git branch. >> >> > I tried this again last night with no luck. I did get a little further by > making sure the rtt texture had it's internal format set and making sure the > mipmap moe was linear. With these i got as far as a texture object is > created and the rtt framebuffer object does seem to be created but now the > whole scene stops rendering properly. i just get the last frame that worked > (from when using frame_buffer). > > I'm leaning toward the fact that a render buffer is also created by the > framebuffer object class. I need to find out if this always happens or > whether it only happens when using another framebuffer object. > > I'll let you know how I get on, but looks like it may take a while as I'll > have to dig into how RenderStage::runCameraSetUp is working. In the rtt > and non rtt situations > > Cheers > Tom >
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