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AnyPS5/docs/dev/debt
thuanquangandClaude Opus 5.5 e3e91de963 docs(agc): record that the host sampler replaces TRUNC_COORD's rounding
On RDNA 2, an S# with TRUNC_COORD 0 rounds the scaled coordinate to 8
fractional bits, ties to even, and one with TRUNC_COORD 1 truncates it,
for point and bilinear filters. The S# decoder ignores the bit, and
AMD's Windows driver truncates for nearest samplers and rounds for
linear ones, so a TRUNC_COORD 0 point sample just below a texel edge
reads the texel below it. The code comment said the bit moves texel
selection by half a texel at most; the debt entry records the measured
rule instead.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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