ARB_transform_feedback_overflow_query Patches For RadeonSI

[phoronix]

Phoronix: ARB_transform_feedback_overflow_query Patches For RadeonSI

Nicolai Hähnle of AMD has sent out a set of 13 patches to wire-up the ARB_transform_feedback_overflow_query OpenGL extension for RadeonSI Gallium3D...

http://www.phoronix.com/scan.php?page=news_item&px=RadeonSI-Overflow-Query

[FireBurn]

So that's all well and good but what does it do? Why would you check transform feedback overflows, are they good or bad etc?

[droste]

(1) Why is this extension necessary?
RESOLVED: An application can query the number of vertices written to a transform feedback buffer and compare that to the size of the buffer (or number of vertices drawn) to try to detect overflow but that is ineffective if subsequent rendering is to be predicated on that condition. Basically, the whole point is to have a queries which can be used by BeginConditionalRender. Note that this feature is present in another, competing graphics API. This extension will allow one to better implement that API's features on top of OpenGL.

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