[kolkov]

gg v0.52.7. Patch release: five contributor PRs merged, plus the wgpu v0.34.10 and naga v0.21.5 bump.

Added

• Font fallback stays on the GPU text path (feat(text): keep MultiFace font fallback on GPU #513, No supported way to render text with font fallback on the GPU path #521, thanks @besmpl) — text drawn with a MultiFace or
  FilteredFace that mixes fonts used to fall back to CPU rendering, because the GPU paths need glyph IDs from one
  font. Text is now split into runs by source font before shaping (MultiFace.FontRuns, FilteredFace.FontRuns,
  text.ShapeRuns), each glyph keeps the face it came from (ShapedGlyph.Face), and single-font runs go to the
  glyph-mask and MSDF pipelines.
• SetAcceleratorMaxSampleCount (feat(gpu): SetAcceleratorMaxSampleCount caps MSAA, 1 turns it off #547, thanks @sogonov): caps the MSAA sample count of the GPU
  accelerator. 1 turns multi-sampling off (strategyNoMSAA, the path
  software adapters already take), and 0 restores the default. The optional
  SampleCountAware interface carries it, and SDFAccelerator implements it
  by forwarding to GPUShared. An application that draws only glyph-mask text
  and pixel-aligned rectangles, such as a terminal UI, looks the same without
  MSAA. Turning it off frees the 4x color and depth/stencil targets: about
  120 MB of GPU memory for a 2060x1638 window, with screenshots identical
  byte for byte.

Fixed

• Translucent fills and strokes on the GPU stencil path render at full strength again (fix(gpu): premultiply stencil colors only once #540, thanks @timzifer) —
  the renderer stores premultiplied colour for the stencil-then-cover pass and the cover uniform multiplied by alpha
  a second time, so translucent geometry came out as alpha²·colour over the background: darker and grayer than
  the CPU output. Opaque colours were unaffected, which is why it depended on what was drawn.
• FontSource keeps one copy of its data (fix(text): FontSource parses its own copy of the data, and keeps one #546, thanks @sogonov) — NewFontSource documented that the caller's
  slice may be reused, but it parsed the caller's slice and stored a copy that nothing read: reusing the buffer broke
  the font, and every source held its file twice. It now parses the copy, and NewFontSourceFromFile hands over the
  buffer it just read instead of copying it.
• Arbitrary-path clips draw their content in gogpu windows — with a circle, star or any other non-rectangular
  clip, nothing inside the clip was drawn when gg rendered into a window (examples/clip_path). On that path the
  frame is recorded into gogpu's command encoder, and gg dropped the pass that marks the clip region in the depth
  buffer while the clipped content still tested against it. Offscreen rendering with readback was not affected. A
  GPU readback test now renders through a shared encoder as well.
• ggcanvas.New reuses the canvas instead of allocating one per frame (fix(ggcanvas): idempotent New() + auto-resize Draw() — prevent per-frame allocation #484, fix(ggcanvas): reuse canvases and track window size #496, thanks @besmpl) —
  applications that take a fresh GPUContextProvider wrapper every frame and call ggcanvas.New with it got a new
  canvas, context and texture pipeline each time. New and NewWithScale now return the existing canvas for the
  same GPU device, size and scale, keyed by the provider's stable device/queue/adapter handles. A different size or
  scale keeps its own canvas, and Draw follows the window's size from WindowProvider. Render now reads the
  window provider under the canvas's lifecycle lock, since a concurrent New replaces it.

Changed

• Dependencies: wgpu v0.34.10, naga v0.21.5, gpucontext v0.31.3, gputypes v0.8.2, go-webgpu/goffi v0.6.8,
  go-webgpu/webgpu v0.5.5. wgpu v0.34.10 releases resources before they are submitted, refcounts samplers and holds
  them from bind groups, keeps a texture alive from its view, and holds the Vulkan dynamic buffer types in the
  descriptor pool; naga v0.21.5 carries the security fixes of the v0.21 line. The go line stays 1.25.0.

go get github.com/gogpu/gg@v0.52.7

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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