On 09/30/2014 03:38 PM, Rob Clark wrote:
From: Rob Clark <[email protected]>
TGSI->TGSI pass, extracted from freedreno. Currently provides the
following lower support, to help drivers emulate unsupported opcodes
or features:
Individual opcodes:
DST, XPD, SCS, LRP, FRC, POW, LIT, EXP, LOG, DP4, DP3, DPH,
DP2, DP2A
Also supported, although it is up to the driver to manage it's own
shader variants:
+ two-sided-color
+ texture coord saturate (ie. to emulate GL_CLAMP)
All of the lowering operations are opt-in so a driver can pick and
choose what it wants.
Signed-off-by: Rob Clark <[email protected]>
Hi Rob, a few thoughts:
How about moving this into the src/gallium/auxiliary/tgsi/ directory
since this is a very TGSI-specific thing?
I think some of my recent changes to the tgsi_transform code would be
helpful, like emit_epilog/prolog() and the various
tgsi_transform_opX_inst() helpers.
There's a lot of tricky code trying to determine the exact size of the
new shader token buffer. Why not just use a 2x buffer and then realloc
to the exact size at the end?
I think the big if/switch statements could be replaced by some kind of
table-driven system.
FWIW, I have a two-sided lighting transformation function too that I
haven't pushed to master yet.
-Brian
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