#panfrost on 2022-03-19 — irc logs at oftc.irclog.whitequark.org

2021-07-26 22:56 ChanServ changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard & Bifrost - Logs https://oftc.irclog.whitequark.org/panfrost - <macc24> i have been here before it was popular

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01:12 <icecream95> alyssa: It looks like the blob uses a compute shader for XFB on Valhall.. I guess my processor definition for Ghidra will finally come in handy?

01:13 <icecream95> +003E60 19 00 00 00 60 00 00 00 80 A5 D0 FF DE FF 00 00 XREFS: ffdeffd0b060 [8] -> 003580 00 00 00 00 00 00 00 00 0C 00 00 00 00 00 00 00

01:14 <icecream95> That is.. the compute shader (I assume) gets a pointer to a buffer with the draw mode in it...

01:15 <icecream95> The compute shader runs seperately from the IDVS job; the IDVS draw does not write the TF varying

01:18 <icecream95> Hmm.. I should probably add a hack in panloader for shader replacements. Or I guess I could use a Piglit test..

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01:39 <alyssa> Delightful :v

01:41 <icecream95> Wait.. since when was the 0x77 opcode known?

01:42 <icecream95> Oh wait, that was one I found out.. I forgot about that already

01:43 <icecream95> I wonder if I maybe should have used the XML at least *somewhat* for Ghidra.. I have to write support for every opcode by hand

01:45 <icecream95> alyssa: I guess I should create a MR against Mesa for all the opcodes I reversed?

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01:46 * icecream95 tries to remember how to use sleigh

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01:50 <alyssa> .h0 .h0 .h0

01:59 <icecream95> DEST: D1^".h0" is D1 & DM=1 { export D1; }

02:00 <icecream95> For source swizzles I use Mako to generate the sleigh rather than writing it by hand

02:05 <icecream95> Oops.. backwards branches aren't working properly..

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07:30 <icecream95> Umm.. I decompiled just one of the three massive compute kernels used for XFB, and it came out at 2846 lines.. this will take a while to get through

07:35 <icecream95> alyssa: It seems that what the blob *actually* does is.. use a compute job for vertex shading, then use a passthrough position shader with IDVS

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12:59 <alyssa> icecream95: Ahhhh

12:59 <alyssa> I hate it, but sensible I guess

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