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- Unmapped GPU addresses get a stand-in CPU address fixed by the GPU
address. A fresh one per lookup meant FindImage never found an image
there again: title 1's bloom chain at 0xf0000-0x15b600 was re-created
on every use (~5,400 images per 600 frames), filling VRAM.
- ASTC whose blocks carry no alpha (exact endpoint-mode scan reusing the
decoder's block parsing) is re-compressed to BC1 instead of BC3, half
the size; about 70% of title 1's ASTC qualifies. Copies between BC1
and BC3 hosts are skipped (their guest data is uploaded instead).
EDEN_NX2_ASTC_BC1=0 turns it off.
- Deleting an image cancels every decode still queued for it. An image
re-decoded mid-decode has two; the first to finish cleared IsDecoding,
the second was not cancelled and was uploaded into the next image to
take the slot: garbage textures (the title logo, road patches) and a
staging overrun when that image was smaller.
- Diagnostics: images created and deleted per 600 frames by shape,
collector deletions, async decodes, BC1/BC3 split; collector
thresholds overridable (EDEN_NX2_TC_EXPECTED_MIB/CRITICAL_MIB); GPU
ASTC decode wait timing (EDEN_NX2_ASTC_FLUSH=1 submits without it).
Title 1 attract loop: device memory 4.8-5.1 GB instead of 5.9-6.1 GB, no
decoded textures evicted, ~17 -> 22-23 fps.
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From changes.patch: the TU104/GA10x MME interpreter (shared macro context for
the process's channels, also on the compute class), native compute with QMD
3.0 dependency scheduling, the Ampere-to-Maxwell shader lowering, native
vertex stream sizes, and the console's GOB swizzle for textures, DMA copies
and the host unswizzle shaders. Switch 2 channels turn all of it on at init.
The lowering is widened for title 4 (all 32 of its programs lower): general
TEX (any dimension/LOD/mask, operand split 1+1/2+1/2+2/4+n, any but consistent
descriptor buffer), cube/array, SULD channel masks, 128-bit STG, indexed IPA,
VOTE, SHFL with any immediate or predicate output, R2P/P2R byte select,
uniform ULOP3/ULEA/UBREV/UFLO.SH/UISETP signed/UMOV URZ, IMNMX cbuf, IADD3
and FFMA uniform operands, FMUL /4 /8 x8, and BSSY/BSYNC/BREAK/WARPSYNC as
no-ops. The capture stops at unmapped memory. EDEN_NX2_SHADER_DUMP dumps every
native program; tools in C:\dev\nx2work test the lowering offline.
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