marfrit
a4e7d8ab90
panvk-bifrost campaigns (r1..r4 Vulkan compositor + r5.video1 Vulkan
video decode) shipped before this repo existed; the deliverable
patches live in marfrit-packages, but the reasoning chain, phase docs,
and source-state evidence lived only in local working trees on the
development host.
This retrofit imports:
- mesa-panvk-bifrost/ — r1..r4 era phase docs (iter1..iter18)
(libmali stub blobs at iter18/blob/ excluded
— 109MB of RE artifacts replaced with a README
pointer)
- mesa-panvk-bifrost-video/ — sibling campaign phase docs + probe
- evidence/ — frozen .tgz source snapshots at each milestone
(basis for the 0005 patch diff generation)
Future iterations should branch off here from day one, so each iter is
a commit rather than a snapshot. See [[feedback-session-local-process-pins]]
for the process drift this retrofit closes.
Total: 1.9 MB across 124 files.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
58 lines
2.3 KiB
Plaintext
58 lines
2.3 KiB
Plaintext
iter6 depth-tested multi-draw probe — captured 2026-05-19 on ohm
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(PineTab2 v2.0, RK3566, Mali-G52 r1 MC1, Mesa 26.0.6, kernel 7.0.0-danctnix1-6)
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Source: panvk-bifrost/iter6/{probe_depth.c, .vert, .frag, Makefile}
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Deployed to: /tmp/panvk-iter6/
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===== RUN #1 (baseline) =====
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[step] vkCreateInstance
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WARNING: panvk is not a conformant Vulkan implementation, testing use only.
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[info] gpu='Mali-G52 r1 MC1'
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[info] D32_SFLOAT optimalTilingFeatures=0xd601
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[step] vkCreateDevice
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[step] vkCreateBuffer vertex buffer
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[step] vkCreateImage color attachment
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[info] color image memReq size=69632 align=4096
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[step] vkCreateImage depth attachment (D32_SFLOAT)
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[info] depth image memReq size=69632 align=4096
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[step] vkCreatePipelineLayout + shaders
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[step] vkCreateGraphicsPipelines
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[step] record cmd buffer (2 draws with depth)
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[step] submit + wait
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[step] verify
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[chk] ( 0, 0) TL expect=clear got=0x00000000 clear-ok
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[chk] (127,127) BR expect=clear got=0x00000000 clear-ok
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[chk] ( 64, 64) center expect=green got=0xff00ff00 green-ok
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[chk] ( 64, 30) above-B expect=red got=0xff0000ff red-ok
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[chk] ( 64,100) below-B expect=red got=0xff0000ff red-ok
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[info] coverage: red=3850 green=1352 clear=11182 other=0 (total 16384)
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[PASS] depth-tested multi-draw works.
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===== KEY OBSERVATIONS =====
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1. D32_SFLOAT optimalTilingFeatures = 0xd601:
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bit 0 (0x0001) SAMPLED_IMAGE
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bit 9 (0x0200) DEPTH_STENCIL_ATTACHMENT ✓
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bit 10 (0x0400) BLIT_SRC
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bit 12 (0x1000) SAMPLED_IMAGE_FILTER_LINEAR
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bit 14 (0x4000) TRANSFER_SRC
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bit 15 (0x8000) TRANSFER_DST
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2. Memory:
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color image memReq = 69632 (17 pages) — 16 raw + 1 aux
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depth image memReq = 69632 (17 pages) — same overhead for D32
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128*128*4 = 65536 = 16 pages raw pixel data
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3. Coverage accounting:
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Triangle A (red, large): NDC area 1.28 / 4 = 32% = ~5243 pixels expected
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Triangle B (green, small, inside A): NDC area 0.32 / 4 = 8% = ~1310 pixels expected
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Got: red=3850, green=1352
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Sum non-clear: 5202 ≈ A's total area (B occludes part of A in depth)
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other=0 — no banding, no z-fighting, no interpolation artifacts.
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4. Depth test correct:
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Pixel (64, 64) is inside both triangles. B's z=0.3 < A's z=0.7,
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LESS comparison selects B → green wins. Confirmed at (64, 64).
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5. No GPU faults, no validation warnings, deterministic across reruns.
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