[osg-users] New glTexStorage code is disrupting FBO initialization

[Glenn Waldron]

Several OSG examples also bind to COLOR_BUFFER0 for RTT and they fail in a
similar fashion: osgoit, osgblenddrawbuffers, osgSSBO, osgdeferred.

Glenn Waldron


On Fri, Aug 10, 2018 at 1:48 PM Glenn Waldron <gwaldron at gmail.com> wrote:

> Julian,
> New information: In osgEarth we use Camera::attach like so:
>
>    rttCamera->attach(osg::Camera::COLOR_BUFFER0, texture);
>
> If I replace COLOR_BUFFER0 with COLOR_BUFFER, it works. Been using the
> former since forever but maybe it was wrong.
>
> Glenn Waldron
>
>
> On Fri, Aug 10, 2018 at 12:39 PM Julien Valentin <
> julienvalentin51 at gmail.com> wrote:
>
>> Hi
>> It's weird that immutable texture interact with fbo render to texture.
>> I've done a lot of FBORTT since this commit and haven't seen any problem
>> Are you sure your problem come from here?
>> Try to replicate the behavior in a simple example code please
>>
>> Cheers
>>
>>
>> gwaldron wrote:
>> > Robert,
>> >
>> >
>> > We recently pulled the latest master branch of OpenSceneGraph, and
>> found that FBOs in osgEarth no longer initialize properly. We narrowed the
>> problem down to this commit which appears to introduce the usage of
>> glTexStorage:
>> >
>> >
>> >
>> https://github.com/openscenegraph/OpenSceneGraph/commit/7be09e8dcd1ed63eb501c12bb7c8df6f6902783b
>> (
>> https://github.com/openscenegraph/OpenSceneGraph/commit/7be09e8dcd1ed63eb501c12bb7c8df6f6902783b
>> )
>> >
>> >
>> > We are seeing output like the following.
>> >
>> >
>> > RenderStage::runCameraSetUp(), FBO setup failed, FBO status= 0x8cd6
>> >
>> > Warning: RenderStage::runCameraSetUp(State&) Pbuffer does not support
>> multiple color outputs.
>> > ContextData::incrementContextIDUsageCount(0) to 2
>> > Warning: detected OpenGL error 'invalid enumerant' after applying
>> attribute Viewport 000002517C076560
>> > RenderStage::runCameraSetUp(), FBO setup failed, FBO status= 0x8cd6
>> > Warning: RenderStage::runCameraSetUp(State&) Pbuffer does not support
>> multiple color outputs.
>> > ContextData::incrementContextIDUsageCount(0) to 3
>> >
>> >
>> > The "osgprerender" example still seems to work but generates FBO
>> warnings as well.  I have not had a chance for a deep-dive yet ... but
>> wanted to make you aware.
>> >
>> >
>> > Glenn Waldron / osgEarth
>> >
>> >  ------------------
>> > Post generated by Mail2Forum
>>
>>
>> ------------------------
>> Twirling twirling twirling toward freedom
>>
>> ------------------
>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=74485#74485
>>
>>
>>
>>
>>
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