@babylonjs/viewer/dist/chunks/gltf-feature-primitive-_T6tuILC.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 { au as mat4Determinant3 } from './index-DMbDahsc.esm.js';

function buildPrimitiveState(topo, indexU32) {
  const prim = {
    topology: topo === 1 ? "point-list" : topo === 2 ? "line-list" : topo === 3 ? "line-strip" : "triangle-strip"
  };
  if (topo < 4) {
    prim.cullMode = "none";
  }
  if (topo > 2) {
    prim.stripIndexFormat = indexU32 ? "uint32" : "uint16";
  }
  return prim;
}

const MSH_REVERSE_WINDING = 1 << 11;
const MSH_TOPOLOGY_SHIFT = 12;
const MSH_INDEX_U32 = 1 << 15;
const feature = {
  id: "_primitive",
  async applyMesh(meshData, mesh) {
    const mode = meshData._primitive?.mode;
    const topo = mode === 0 ? 1 : mode & 1 ? mode + 3 >> 1 : void 0;
    const mirrored = mat4Determinant3(meshData._worldMatrix) > 0;
    let features = topo ? topo << MSH_TOPOLOGY_SHIFT | (topo > 2 && mesh._gpu.indexFormat === "uint32" ? MSH_INDEX_U32 : 0) : 0;
    if (mirrored) {
      features |= MSH_REVERSE_WINDING;
    }
    if (topo || mirrored) {
      const prim = topo ? buildPrimitiveState(topo, mesh._gpu.indexFormat === "uint32") : {};
      if (mirrored) {
        prim.frontFace = "cw";
      }
      mesh._primitive = prim;
    }
    if (features) {
      mesh._primitiveFeatures = features;
    }
  }
};

export { feature as default };
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