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feat(hero): instanced ribbon trail renderer #30

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patman wants to merge 1 commit from patman/hero-renderer into patman/hero-shaders AGit
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patman commented 2026-06-12 19:46:13 +00:00
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PR 5/7 in the hero-toolpaths stack (prev: hero-shaders, next: hero-lifecycle). One shader pair; trail segments are instanced ribbon quads (never gl.LINE_STRIP) over a fixed 2048-slot ring VBO per racer; one small bufferSubData per racer per frame is the only GPU upload. Fragment alpha fades with segment age so paths dissolve before the ring wraps — infinite trail, fixed memory. WebGL2 with WebGL1+ANGLE fallback; the cutting head is the newest segment redrawn 3.5x wide (age near 0 makes it white-hot), no second shader. Review focus: ring indexing incl. the head-redraw offset at wrap; instance attribute setup/divisors; constant draw cost.

PR 5/7 in the hero-toolpaths stack (prev: hero-shaders, next: hero-lifecycle). One shader pair; trail segments are instanced ribbon quads (never gl.LINE_STRIP) over a fixed 2048-slot ring VBO per racer; one small bufferSubData per racer per frame is the only GPU upload. Fragment alpha fades with segment age so paths dissolve before the ring wraps — infinite trail, fixed memory. WebGL2 with WebGL1+ANGLE fallback; the cutting head is the newest segment redrawn 3.5x wide (age near 0 makes it white-hot), no second shader. Review focus: ring indexing incl. the head-redraw offset at wrap; instance attribute setup/divisors; constant draw cost.
feat(hero): instanced ribbon trail renderer
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58e8fd8a0d 
One shader pair. Trail segments are instanced screen-space ribbon quads
(constant pixel width — never gl.LINE_STRIP) over a fixed 2048-slot ring
VBO per racer; one small bufferSubData per racer per frame is the only
GPU upload. Fragment alpha fades with segment age so paths dissolve
before the ring wraps: infinite trail, fixed memory. Additive blending
for glow, no postprocessing. WebGL2 with WebGL1+ANGLE fallback; the head
is the newest segment redrawn wider, no second shader.
patman force-pushed patman/hero-renderer from 58e8fd8a0d
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2026-06-12 21:12:32 +00:00 Compare
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