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spec(t27f): reel host entry points for wasm hosts (Closes #9980) - #9982
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A wasm export carries scalars only and gen-js emits no bodies, so a host could not run reel.t27's camera and screen mapping without re-implementing them. Add scalar entry points that name the demo reel and compose camera with screen mapping: corner_dx/dy, demo_frames, demo_scene_at, demo_still, demo_sx/sy, demo_r, demo_corner_sx/sy. gHashTag/t27-mcp t27f_view draws stills from a wasm build of the Zig output. Tests: hexagon_corners_close_the_cell, demo_entry_points_match_the_reel, overview_still_fits_every_frame (every corner of every cell on every preset). Refs #9965 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Consumer: gHashTag/t27-mcp#3 (t27f_view) builds these entry points into wasm/reel.wasm and draws the demo stills from them. |
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October 17, 2026 15:10
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Summary
This PR adds scalar host entry points to
specs/t27f/reel.t27, so a wasm host can draw stills of the demo reel without re-implementing the spec's math. Closes #9980. Refs #9965.A wasm export carries scalars only, and
gen-jsemits constants but no bodies. So the new entry points take the demo reel by name rather than as arrays. They also compose the camera with the screen mapping inside the spec, so the host only draws what they return:corner_dx(i)andcorner_dy(i): corner i of a pointy-top hexagon, in world units;demo_frames(),demo_scene_at(f)anddemo_still(scene): the demo reel's frame clock;demo_sx,demo_syanddemo_r: world coordinates to screen pixels at frame f, for a given preset;demo_corner_sxanddemo_corner_sy: a cell's corner on screen.The consumer is gHashTag/t27-mcp
t27f_view, which runs the bodies from a wasm build of this file's Zig output and reads the constants from itsgen-jsoutput.Tests added
hexagon_corners_close_the_cell: opposite corners mirror, the top corner is at -HEX_R, and the side corners are at +/-HALF_W.demo_entry_points_match_the_reel:overview_still_fits_every_frame: every corner of every cell at the overview still lies inside the frame on all three presets (486 asserts).Evidence (Railway lab, compiler 0.5.2 built at 57474a4)
corner_dy(0)flipped fails 2 tests;>=changed to>indemo_stillfails 1 test;camera_cyreplaced byOVERVIEW_CYindemo_syfails 1 test. It survived until the lens-still assert was added, because cell 10's y equals OVERVIEW_CY.specs/t27f/reel.t27:1ec53e9f89801946c7c265049e20b775dbf4d71822bd4c00b262c827a3e76f87.The header no longer says that no host imports the file. It now names
t27f_viewas the only host. It still says that no video has been rendered.🤖 Generated with Claude Code