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The shader-based gradient (linear/radial) fragment shader now adds a
mean-zero triangular-PDF dither (~1 LSB of 8-bit) from a spatial pixel-position
hash before writing finalColor, so smooth ramps (e.g. an alpha fade) no longer
show quantization banding when written to the 8-bit surface buffer. Spatial,
non-temporal — no shimmer on static panels. Applies to every shader gradient.
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The keystone for the stage dock. Proves Fork B on the real target (Mesa crocus,
HD 4400): a toplevel's pixels, rendered by the wlr GLES2 renderer into a LINEAR
ARGB8888 dmabuf, import as an EGLImage -> sampled GL texture in the sibling RMLUi
GLES 3.2 context (the slice-3 bridge run in reverse) and composite into an
<img src="unbox-preview://N"> inside a ui surface — upright, color-correct.
Public surface (ui.hpp): class Preview (source_uri/source_width/source_height/
refresh) + UiSubstrate::create_preview(wlr_scene_tree*) -> unique_ptr<Preview>
(nullptr if no GL path; never throws). Kernel-suite probes: ui_preview_import_is_dmabuf,
ui_pixel(x,y). Clean four-resource teardown (URI reg, GL texture, EGLImage, dmabuf);
refresh-after-source-destruction is UB (consumer drops Preview on unmap).
kernel 42 cases/150 assertions green on build + build-asan (asan clean, no new
suppressions). Edits confined to packages/kernel/.
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Plan A verified on hardware (HD 4400/crocus): RMLUi renders into a GLES
3.2 sibling-context FBO backed by a dmabuf wlr_buffer (wlr_allocator +
EGLImage import), composited as a wlr_scene_buffer with per-frame damage.
Plan B (glReadPixels→shm) implemented and verified as runtime fallback;
auto-engages when any Plan-A precondition fails. Plan C not needed.
- Hello-world RML doc: text, data-bound frame counter, pointer input
proof (hover/:active) — verified upright on screen via screenshot after
fixing the classic FBO Y-flip (buffer-level V-flip keeps display ==
document coords for input); position-aware orientation guard added.
- Temporary spike surface: Options::ui_spike + frame-count/orientation
probes, host-bin --ui-spike flag; replaced by the real ui substrate
contract in slice 4+.
- kernel suite 6 cases / 416 assertions green; ASan/UBSan clean in our
code (Mesa leak noise + 2 benign UBSan downcast reports inside vendored
RMLUi are known); idle RSS ≈83 MiB.
- Deferred (notes/plan.md §7): glFinish→EGL fence + swapchain; dmabuf
render-format negotiation (private API in wlroots 0.20).
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