Hello Michael,
On Thu, Apr 2, 2015 at 8:28 AM, Michael Raab <michael-r...@gmx.de> wrote:
> for deferred shading purposes I would like to separate opaque from
> translucent objects as I would like to render translucent objects in a
> separate forward pass after the deferred shading phase for opaque objects.
> If I investigated that correctly, after the call to recurseFromThis() in
> DeferredShadingStage::scheduleGBufferPass() the active partition should hold
> two filled lists of functors, an opaque and a translucent one.
> I thought of the following sequence:
> 1.) Copy the current partition (including the mentioned lists)
> 2.) Clear translucent list from active partion
> 3.) Clear opaque list in cloned partition
> 4.) Schedule shading pass
> 5.) Push cloned partition
> 6.) Draw the 3 partitions in sequence
>
> The things that need to be implemented from my point of view should be:
> - a clone function for partitions
> - a push-method using partion pointers
> - clear functions for opaque and translucent functor list
>
> Do you see any problems I'm not aware of? Did I miss something?
hmm, IIRC RenderPartitions are allocated off of pools to avoid having
to hit the system memory allocated too often and to allow for reuse of
the storage allocated by their members (e.g. allow reuse of any
std::vectors they contain) and in general requesting a new partition
also sets it up to be rendered.
The lists of opaque and translucent objects are subtrees of the
DrawTree that the partitions build up when traversing the scene. The
nodes of the DrawTree are also allocated from pools (usually quite a
few DrawTreeNodes are needed each frame) and probably don't have
existing API to duplicate them (especially duplicate them on a
different pool).
I guess it's possible to do what you are describing, there are some
details (like the pool allocation) that may need some working around.
Cheers,
Carsten
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