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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283/** * Parsing for 3D color cubes in the `.cube` format (the vendored G'MIC * film LUTs). The engine stays pure: `parseCube` turns text into a * `LutCube`; fetching bytes and uploading the GPU texture are the * frontend's concern. * * The vendored LUTs are 13³ cubes with `DOMAIN_MIN/MAX 0..1`; the parser * reads the size and the data points and ignores everything else. It is * tolerant of the minor format variations seen in the wild (blank lines, * comments, extra columns) but strict about the one thing that matters: * exactly `size³` data points. */
import { Schema } from "effect"
/** A parsed 3D color cube. `data` holds `size³ × 3` floats in the file's * point order — for the vendored G'MIC cubes that is index * `(b * size + g) * size + r`: the red channel varies fastest, blue slowest * (verified against the upstream data, where point index 1 is the red-axis * step). The GPU backend strides this same order into the 3D texture, so * the texture's X/Y/Z axes are the file's red/green/blue channels and the * shader can sample `color.rgb` as the texture coordinate directly. */export interface LutCube { readonly size: number /** `size³ × 3` floats, file point order (red fastest for the vendored cubes). */ readonly data: Float32Array}
export class LutParseError extends Schema.TaggedErrorClass<LutParseError>()( "LutParseError", { message: Schema.String, },) {}
const SIZE_RE = /^LUT_3D_SIZE\s+(\d+)/
/** * Parse `.cube` text into a `LutCube`. Throws `LutParseError` on malformed * input (missing or invalid size, wrong data point count, non-numeric * values). Lines other than the size header and data points — `TITLE`, * `DOMAIN_MIN/MAX`, comments, blanks — are ignored. */export function parseCube(text: string): LutCube { let size = 0 const values: number[] = []
const lines = text.split(/\r?\n/) for (const raw of lines) { const line = raw.trim() if (line === "" || line.startsWith("#")) continue
const sizeMatch = SIZE_RE.exec(line) if (sizeMatch) { size = Number(sizeMatch[1]) if (!Number.isInteger(size) || size < 2) { throw new LutParseError({ message: `Invalid LUT_3D_SIZE: ${line}` }) } continue }
if (line.startsWith("TITLE") || line.startsWith("DOMAIN")) continue
// Data line: at least three floats (extra columns are tolerated and // ignored, e.g. an alpha column in some exporters' output). const parts = line.split(/\s+/).map(Number) if (parts.length < 3 || parts.slice(0, 3).some((n) => Number.isNaN(n))) { throw new LutParseError({ message: `Malformed data line: ${line}` }) } values.push(parts[0]!, parts[1]!, parts[2]!) }
if (size === 0) throw new LutParseError({ message: "Missing LUT_3D_SIZE header" }) const expected = size * size * size if (values.length !== expected * 3) { throw new LutParseError({ message: `Expected ${expected} data points for a ${size}³ cube, got ${values.length / 3}`, }) }
return { size, data: new Float32Array(values) }}