Hi! (I'm new to all this OSG stuff...)
I'm trying to implement some basic HDR tone mapping using FP
(GL_RGBA16F_ARB) textures in OSG. It is a multi-pass shader based
technique, I draw the scene, do a bunch of luminance calculations and
end up with a 1x1 texture that is the average scene luminance. As a
part of the tone mapping I am trying to do adaptive tone mapping so
changes gradually happen over a duration of time, this is done by
slowly adapting the average luminance between frames.
So at some point in each frame I have the scene luminance for the
current frame. I input that, plus the adapted scene luminance from
the last frame to a shader that calculates the proper adapted average
luminance for this frame...
Now what I am trying to do is copy that resulting texture over to the
'old' texture reference so that next frame it will be the old texture
that is passed in...but its not working! Regardless of how I'm doing
multi-pass stuff, building a simple quad and texturing it with either
the current/unadapted frame luminance or the adapted frame luminance
works, but the adapted frame luminance texture from last frame is
nowhere to be found suggesting that my texture copying isn't working...
All I am doing is something like this
(Global)
osg::ref_ptr<osg::Texture2D> oldTex;
osg::ref_ptr<osg::Texture2D> adaptTex;
...
[Tons happens, adaptTex is initialized, gets used as a render target
and works as it can be drawn to a quad and looks fine]
...
In while(!mViewer.done()):
oldTex = new osg::Texture2D(*(adaptTex.get()),
osg::CopyOp::SHALLOW_COPY);
adaptPassStateSet->setTextureAttributesAndModes(1, oldTex.get());
and as I said adaptTex looks fine when pasted on a quad, but oldTex
doesn't seem to be there. I've tried other CopyOps from
DEEP_COPY_IMAGES to DEEP_COPY_ALL. But this texture just never seems
to get copied...whats up?
I'm sure making a whole new texture each frame isn't the most
efficient way of doing this, but I'm just trying to get my proof of
concept working and I am stuck on simply cloning a texture in OSG.
Jon
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