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>
78 lines
3.0 KiB
Plaintext
78 lines
3.0 KiB
Plaintext
iter3 fullscreen triangle 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/iter3/{probe_triangle.c, probe_triangle.vert, probe_triangle.frag, Makefile}
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Deployed to: /tmp/panvk-iter3/
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Build: clean
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===== RUN #1 (no validation layer) =====
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$ PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1 ./probe_triangle
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[step] vkCreateInstance (+VK_KHR_get_physical_device_properties2)
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[step] vkEnumeratePhysicalDevices
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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' apiVersion=1.0.335
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[step] vkCreateDevice (+dynamic_rendering chain)
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[step] vkCreateImage (64x64 R8G8B8A8_UNORM, COLOR_ATTACHMENT|TRANSFER_SRC)
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[info] image memReq size=20480 alignment=4096
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[step] vkCreateImageView
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[step] vkCreatePipelineLayout + shaders
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[step] vkCreateGraphicsPipelines
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[step] record (dynamic rendering + draw + copy)
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[step] submit + wait (10s)
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[step] invalidate + verify
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[info] mismatches=0/4096 sentinel=0 cleared_black=0
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[PASS] PanVk-Bifrost triangle: all 4096 pixels match.
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===== RC=0 =====
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===== RUN #2 (VK_LAYER_KHRONOS_validation) =====
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[same step trace; no validation warnings/errors]
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[info] mismatches=0/4096 sentinel=0 cleared_black=0
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[PASS]
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===== RC=0 =====
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===== STABILITY: 5 consecutive reruns =====
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[info] mismatches=0/4096 sentinel=0 cleared_black=0 [PASS]
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[info] mismatches=0/4096 sentinel=0 cleared_black=0 [PASS]
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[info] mismatches=0/4096 sentinel=0 cleared_black=0 [PASS]
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[info] mismatches=0/4096 sentinel=0 cleared_black=0 [PASS]
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[info] mismatches=0/4096 sentinel=0 cleared_black=0 [PASS]
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7/7 runs PASS, all 4096 pixels per run match the expected gl_FragCoord encoding.
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===== KEY OBSERVATIONS =====
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1. Device-extension chain enables cleanly with all 5 KHRs:
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VK_KHR_multiview
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VK_KHR_maintenance2
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VK_KHR_create_renderpass2
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VK_KHR_depth_stencil_resolve
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VK_KHR_dynamic_rendering
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plus instance VK_KHR_get_physical_device_properties2 and
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VkPhysicalDeviceDynamicRenderingFeaturesKHR.dynamicRendering = VK_TRUE.
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2. Image memReq for 64×64 RGBA8 COLOR_ATTACHMENT|TRANSFER_SRC:
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size = 20480 (5 pages)
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alignment = 4096
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Raw pixel data: 64*64*4 = 16384 bytes (4 pages).
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The extra page is Mali tile state / AFBC metadata / aux tiling structures
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that PanVk allocates alongside the color attachment.
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3. Pixel-position encoding round-trips exactly:
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(0,0) -> 0xff800000 ✓
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(63,0) -> 0xff80003f ✓
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(0,63) -> 0xff803f00 ✓
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(63,63) -> 0xff803f3f ✓
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(32,32) -> 0xff802020 ✓
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(all 4096) -> exact match
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gl_FragCoord.xy in pixel-center coords (+0.5) → uvec2 floor gives exact
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pixel index. Vulkan's top-left origin honored. No off-by-half, no Y-flip.
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4. Bifrost tile binning works:
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16×16 tile size × 64×64 image = 16 tiles (4×4 grid)
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Each tile flushed cleanly; no missing tile, no swapped tiles, no
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tile-coverage gap at boundaries.
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5. No GPU faults, no MMU faults, no kernel-side panfrost messages
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across all 7 runs.
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