A use of the packed ancillary VGPR other than a constant field extract (the word passed through a
select before its sample number is extracted) reads the word rebuilt from the sample number (bit 8)
and the render target index (bit 16). Extracts of other bits straight from the word stay refused, and
the refusal now names the uses.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Any other live use of the packed register keeps throwing, as on main, instead of
reading SampleId << 8 | Layer << 16 with the other bits zero. The field range
check no longer underflows for an extract that starts past a field's end.
Adds the pixel_ancillary recompiler test.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Bit-field extracts of the packed ancillary VGPR become gl_SampleID and gl_Layer reads. A pixel
shader reading gl_Layer needs the Geometry capability instead of ShaderLayer and SPIR-V 1.5, and
the Geometry capability is available whenever the geometryShader feature is. 32-bit
SPI_SHADER_Z_FORMATs and 32_ABGR are accepted with the depth and sample-mask export enables.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Michon
boykopovar