s_getpc_b64 produced the next instruction's offset from the start of the
shader, so code that addresses data stored behind itself built V#s at a
tiny address. Astro Bot's video-frame NV12->RGB pass draws its quad with
an NGG shader that fetches the four vertices from after its own code
(s_getpc_b64; s_add_u32 0x98; s_addc_u32) - the buffer resolved to 0xf0,
every vertex read as zero, the quad never rasterized and the PlayStation
Studios logo video stayed black.
The result is now GetShaderBase + offset. The resource walk already
evaluates GetShaderBase per request from the code address, so the V#
names the real data and the same code at another address still shares
its compiled variant.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ButHENCbXXt8h4EZuWUabJ
d9ac21c6c9