/**
 * Spherical-harmonics degree-1 evaluation (3 coefficients per channel).
 *
 * Reads:   dirX, dirY, dirZ, base, splats, COEFFS_PER_CHANNEL,
 *          SH_C1
 * Defines: (mutates) cR, cG, cB
 *
 * Appends the band-1 contribution to the accumulating per-channel color
 * radiance. Channel-major SH layout: `f_rest_0..N-1` red, then green,
 * then blue.
 */
declare const shBand1 = "\n    {\n        let n = COEFFS_PER_CHANNEL;\n        let shBase = base + 14u;\n        let b0 = -SH_C1 * dirY;\n        let b1 = SH_C1 * dirZ;\n        let b2 = -SH_C1 * dirX;\n        cR = cR + b0 * splats[shBase + 0u] + b1 * splats[shBase + 1u] + b2 * splats[shBase + 2u];\n        cG = cG + b0 * splats[shBase + n + 0u] + b1 * splats[shBase + n + 1u] + b2 * splats[shBase + n + 2u];\n        cB = cB + b0 * splats[shBase + 2u * n + 0u] + b1 * splats[shBase + 2u * n + 1u] + b2 * splats[shBase + 2u * n + 2u];\n    }\n";
export { shBand1 };