buffer_store_format_* and tbuffer_store_format_* wrote the register
bits as they were: an 8_UNORM store of 1.0f wrote 0x00 (the low byte of
0x3f800000), packed formats such as 2_10_10_10 overwrote the whole word
with each component, and the components the instruction does not
provide were left untouched. Each component is now encoded as the
hardware does: unorm/snorm (and uscaled/sscaled, which store the same
way) round x*M exactly to nearest even after clamping, with NaN as 0;
uint/sint saturate; f16 and the 11/10-bit floats truncate toward zero
and saturate. The whole element is written, with the missing components
as 0, and packed formats are composed into one word.
Co-Authored-By: Claude <noreply@anthropic.com>
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