A shader could only say what colour a pixel has. Where the picture
is drawn was fixed to the four corners of its rectangle, so nothing
could wave, bend or wobble.
- The new node Vertex output takes x and y, in pixels of the
picture, and moves every corner of the wearer's grid by them. The
UVs stay with the corners, so the picture bends along.
- Subdivisions on that node says how fine the grid is: cells per
axis, 1 to 64, 8 by default. 1 is the plain quad. A shader without
the node keeps the quad every sprite shares.
- A graph holds one Vertex output at most. UV, Time, Property,
Number and the math nodes may feed it, and one node may feed both
outputs.
- Texture color, Texture alpha, Sample texture, Texture size and
Color cannot feed it. The node says "Not available per corner"
and the shader does not compile.
- Sprites, texts and the preview in the shader tab wear the grid.
A nine-slice sprite and particles draw as if the node were not
there.
- Picking, the selection frame, the size and colliders stay with
the rectangle. A wearer with a Vertex output is never culled, as
with Padding, and with Padding the grid covers the room around
the picture too.
- tools/perf-shaders.mjs takes GM_PERF_SUBDIVISIONS to measure a
grid against the plain quad.
Measured on stein2 (Intel HD 630), frames per second, one run per
row: at 800 sprites 58 with a shader on the quad, 46 with 8 cells,
41 with 32. Up to 400 sprites a grid hardly shows. Every sprite
holds its own grid.
Tests:
- Gate on melektaus-atx: 220 files, 3416 tests, CHECK EXIT 0.
- 15 new unit tests for the compiler and the grid.
- Four new e2e checks in modules 28 and 30: a fixed offset moves
the picture, 8 cells bend only the lower half where 1 cell shears
it all, Texture alpha is refused at the node, a text moves.
- e2e 28,30 on melektaus-atx: 110 checks, all pass.
- The e2e total of 1699 is counted (1695 + 4), the full suite did
not run.
- No counter-probe, no screenshot. Not looked at: the preview, Time
in the browser, flipped sprites, Padding together with the grid.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
adminandClaude Opus 5.5
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