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milescovielloandClaude Opus 5.5
12b20e17f6
A multisampled color target with a CMASK fast clear seeds its state from
the CMASK when it is first used, and later fills of the CMASK update it.
Both read the bytes as DCC keys: 0x00 is a clear, 0xff uncompressed, and
anything else refuses ("reads as mixed"). But an MSAA CMASK nibble is
FMASK code | color code << 2 (Mesa ac_descriptors.h CMASK_MSAA_CODE), so
0xcc (FMASK cleared to fragment 0, color expanded), and the 2x and 4x
"FMASK uncompressed, color expanded" codes 0xdd and 0xee, are states with
no pending fast clear that were refused. Ruffle (PPSA68091) clears its
target's CMASK to 0xcc every frame and stopped on the refusal whenever
that clear landed before the target's first use.
The seed now reads the uniform CMASK byte (after pending writes, like the
key read) and both paths classify it by those codes: 0x00 (register color
clear, FMASK cleared) is the fast clear as before, any color-expanded code
(0xc to 0xf in both nibbles) is "no fast clear", and other codes, or bytes
that differ, are still refused.
Co-Authored-By: Claude Opus 5.5 <[email protected]>