@babylonjs/viewer/dist/chunks/shadow-only-fragment-D5wIoMG3.esm.js

The Babylon Viewer aims to simplify a specific but common Babylon.js use case: loading, viewing, and interacting with a 3D model.

import { Q as PBR_HAS_ALPHA_BLEND, M as MAX_LIGHTS } from './index-By0tcgYN.esm.js';

const PBR2_HAS_SHADOW_ONLY = 1 << 30;
function createShadowOnlyFragment() {
  const unrolled = [];
  for (let i = 0; i < MAX_LIGHTS; i++) {
    unrolled.push(`so_shadowMin = min(so_shadowMin, shadowFactors[${i}]);`);
  }
  const bc = `
{
var so_shadowMin = 1.0;
${unrolled.join("\n")}
color = material.shadowOnlyColor;
alpha = saturate((1.0 - so_shadowMin) * material.shadowOnlyFalloff) * material.shadowOnlyOpacity;
}
`;
  return {
    _id: "shadow-only",
    _uboFields: [
      { _name: "shadowOnlyColor", _type: "vec3<f32>" },
      { _name: "shadowOnlyOpacity", _type: "f32" },
      { _name: "shadowOnlyFalloff", _type: "f32" }
    ],
    _fragmentSlots: {
      BC: bc,
      // Overwrite finalAlpha after the alpha block's luminanceOverAlpha fold so
      // environment/direct specular can't make the shadow catcher opaque. `alpha`
      // holds the shadow term set in BC.
      FA: `finalAlpha = alpha * material.materialAlpha;`
    }
  };
}
function writeShadowOnlyUBO(data, material, offsets) {
  if (!material.shadowOnly) {
    return;
  }
  if (offsets.has("shadowOnlyColor")) {
    const off = offsets.get("shadowOnlyColor") / 4;
    const tint = material.shadowOnlyColor ?? [0, 0, 0];
    data[off] = tint[0];
    data[off + 1] = tint[1];
    data[off + 2] = tint[2];
  }
  if (offsets.has("shadowOnlyOpacity")) {
    data[offsets.get("shadowOnlyOpacity") / 4] = material.shadowOnlyOpacity ?? 1;
  }
  if (offsets.has("shadowOnlyFalloff")) {
    data[offsets.get("shadowOnlyFalloff") / 4] = material.shadowOnlyFalloff ?? 1;
  }
}
const pbrExt = {
  id: "shadow-only",
  phase: "fragment",
  detect(mat) {
    return mat.shadowOnly ? { f: PBR_HAS_ALPHA_BLEND, f2: PBR2_HAS_SHADOW_ONLY } : { f: 0, f2: 0 };
  },
  frag(ctx) {
    if (!(ctx._features2 & PBR2_HAS_SHADOW_ONLY)) {
      return null;
    }
    return createShadowOnlyFragment();
  },
  writeUbo: writeShadowOnlyUBO
};

export { createShadowOnlyFragment, pbrExt, writeShadowOnlyUBO };
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