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asahi: Note some magic bits used with memoryless RTs

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Obviously there can't *actually* be memoryless render targets, because
how would partial renders work? The control stream with memoryless looks
like everything would if it went to memory (e.g. full 2D MSAA
attachments for the partial loads/stores even if only a resolved
2D image for the final store). Except the memoryless attachments all
load from the same address 0xeeee0000. Clearly that's not actually what
happens, so what gives? Unclear... but I see the magic bits mentioned
here set, and I assume there are some firmware (or kernel) shenanigans
used to JIT allocate the backing storage for partial renders.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19811>
This commit is contained in:
Alyssa Rosenzweig
2022-11-09 20:17:42 -05:00
committed by Marge Bot
parent 3fa87e47d5
commit 8be506039d
1 changed files with 2 additions and 0 deletions
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src/asahi/lib/cmdbuf.xml
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@@ -830,6 +830,7 @@
<field name="Deflake 3" start="94:0" size="64" type="address"/>
<field name="Unk 112" start="96:0" size="32" default="0x1" type="hex"/>
<field name="Unk 114" start="98:0" size="32" default="0x1c" type="hex"/>
<field name="Memoryless render targets used" start="100:0" size="1" type="bool"/>
<field name="OpenGL depth clipping" start="100:24" size="1" type="bool"/>
<field name="Unk 118" start="102:0" size="32" default="0xffffffff" type="hex"/>
<field name="Unk 119" start="103:0" size="32" default="0xffffffff" type="hex"/>
@@ -890,6 +891,7 @@
<field name="Stencil buffer 3" start="344:0" size="64" type="address"/>
<field name="Stencil acceleration buffer 3" start="346:0" size="64" type="address"/>
<!-- maybe only set when doing a depth clear? -->
<!-- 0x1000000 bit set with memoryless render targets? -->
<field name="Unk 352" start="352:0" size="32" default="0x1" type="hex"/>
<field name="Unk 360" start="360:0" size="32" default="0x1c" type="hex"/>
<field name="Encoder ID" start="362:0" size="32" type="hex"/>