[Mesa-dev] [PATCH 1/6] tgsi: add TXQ support.

[Ian Romanick]

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On 08/25/2011 06:28 AM, Brian Paul wrote:
> How would the TXQ instruction be implemented for a hardware driver?
> 
> Is there really a HW GPU instruction that returns the size of a texture?
> 
> Otherwise, this seems like something we could implement in the state
> tracker by putting the texture size into a constant buffer slot.  Then
> we'd have it for all drivers.

I've thought about this too, but TXQ is a required feature of GL3 / DX10
hardware.  I think the right way to handle it on hardware that doesn't
do it natively would be a lowering pass at the GLSL IR level.
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