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meshoptimizer

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Mesh optimization library that makes meshes smaller and faster to render

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// This file is part of meshoptimizer library and is distributed under the terms of MIT License. // Copyright (C) 2016-2025, by Arseny Kapoulkine (arseny.kapoulkine@gmail.com) var MeshoptClusterizer = (function () { // Built with clang version 19.1.5-wasi-sdk // Built from meshoptimizer 0.25 var wasm = 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// embed! wasm var wasmpack = new Uint8Array([ 32, 0, 65, 2, 1, 106, 34, 33, 3, 128, 11, 4, 13, 64, 6, 253, 10, 7, 15, 116, 127, 5, 8, 12, 40, 16, 19, 54, 20, 9, 27, 255, 113, 17, 42, 67, 24, 23, 146, 148, 18, 14, 22, 45, 70, 69, 56, 114, 101, 21, 25, 63, 75, 136, 108, 28, 118, 29, 73, 115, ]); if (typeof WebAssembly !== 'object') { return { supported: false, }; } var instance; var ready = WebAssembly.instantiate(unpack(wasm), {}).then(function (result) { instance = result.instance; instance.exports.__wasm_call_ctors(); }); function unpack(data) { var result = new Uint8Array(data.length); for (var i = 0; i < data.length; ++i) { var ch = data.charCodeAt(i); result[i] = ch > 96 ? ch - 97 : ch > 64 ? ch - 39 : ch + 4; } var write = 0; for (var i = 0; i < data.length; ++i) { result[write++] = result[i] < 60 ? wasmpack[result[i]] : (result[i] - 60) * 64 + result[++i]; } return result.buffer.slice(0, write); } function assert(cond) { if (!cond) { throw new Error('Assertion failed'); } } function bytes(view) { return new Uint8Array(view.buffer, view.byteOffset, view.byteLength); } var BOUNDS_SIZE = 48; var MESHLET_SIZE = 16; function extractMeshlet(buffers, index) { var vertex_offset = buffers.meshlets[index * 4 + 0]; var triangle_offset = buffers.meshlets[index * 4 + 1]; var vertex_count = buffers.meshlets[index * 4 + 2]; var triangle_count = buffers.meshlets[index * 4 + 3]; return { vertices: buffers.vertices.subarray(vertex_offset, vertex_offset + vertex_count), triangles: buffers.triangles.subarray(triangle_offset, triangle_offset + triangle_count * 3), }; } function buildMeshlets(indices, vertex_positions, vertex_count, vertex_positions_stride, max_vertices, max_triangles, cone_weight) { var sbrk = instance.exports.sbrk; var max_meshlets = instance.exports.meshopt_buildMeshletsBound(indices.length, max_vertices, max_triangles); // allocate memory var meshletsp = sbrk(max_meshlets * MESHLET_SIZE); var meshlet_verticesp = sbrk(max_meshlets * max_vertices * 4); var meshlet_trianglesp = sbrk(max_meshlets * max_triangles * 3); var indicesp = sbrk(indices.byteLength); var verticesp = sbrk(vertex_positions.byteLength); // copy input data to wasm memory var heap = new Uint8Array(instance.exports.memory.buffer); heap.set(bytes(indices), indicesp); heap.set(bytes(vertex_positions), verticesp); var count = instance.exports.meshopt_buildMeshlets( meshletsp, meshlet_verticesp, meshlet_trianglesp, indicesp, indices.length, verticesp, vertex_count, vertex_positions_stride, max_vertices, max_triangles, cone_weight ); // heap might (will?) have grown -> re-acquire heap = new Uint8Array(instance.exports.memory.buffer); var meshletBytes = heap.subarray(meshletsp, meshletsp + count * MESHLET_SIZE); var meshlets = new Uint32Array(meshletBytes.buffer, meshletBytes.byteOffset, meshletBytes.byteLength / 4).slice(); for (var i = 0; i < count; ++i) { var vertex_offset = meshlets[i * 4 + 0]; var triangle_offset = meshlets[i * 4 + 1]; var vertex_count = meshlets[i * 4 + 2]; var triangle_count = meshlets[i * 4 + 3]; instance.exports.meshopt_optimizeMeshlet( meshlet_verticesp + vertex_offset * 4, meshlet_trianglesp + triangle_offset, triangle_count, vertex_count ); } var last_vertex_offset = meshlets[(count - 1) * 4 + 0]; var last_triangle_offset = meshlets[(count - 1) * 4 + 1]; var last_vertex_count = meshlets[(count - 1) * 4 + 2]; var last_triangle_count = meshlets[(count - 1) * 4 + 3]; var used_vertices = last_vertex_offset + last_vertex_count; var used_triangles = last_triangle_offset + ((last_triangle_count * 3 + 3) & ~3); var result = { meshlets: meshlets, vertices: new Uint32Array(heap.buffer, meshlet_verticesp, used_vertices).slice(), triangles: new Uint8Array(heap.buffer, meshlet_trianglesp, used_triangles * 3).slice(), meshletCount: count, }; // reset memory sbrk(meshletsp - sbrk(0)); return result; } function extractBounds(boundsp) { var bounds_floats = new Float32Array(instance.exports.memory.buffer, boundsp, BOUNDS_SIZE / 4); // see meshopt_Bounds in meshoptimizer.h for layout return { centerX: bounds_floats[0], centerY: bounds_floats[1], centerZ: bounds_floats[2], radius: bounds_floats[3], coneApexX: bounds_floats[4], coneApexY: bounds_floats[5], coneApexZ: bounds_floats[6], coneAxisX: bounds_floats[7], coneAxisY: bounds_floats[8], coneAxisZ: bounds_floats[9], coneCutoff: bounds_floats[10], }; } function computeMeshletBounds(buffers, vertex_positions, vertex_count, vertex_positions_stride) { var sbrk = instance.exports.sbrk; var results = []; // allocate memory that's constant for all meshlets var verticesp = sbrk(vertex_positions.byteLength); var meshlet_verticesp = sbrk(buffers.vertices.byteLength); var meshlet_trianglesp = sbrk(buffers.triangles.byteLength); var resultp = sbrk(BOUNDS_SIZE); // copy vertices to wasm memory var heap = new Uint8Array(instance.exports.memory.buffer); heap.set(bytes(vertex_positions), verticesp); heap.set(bytes(buffers.vertices), meshlet_verticesp); heap.set(bytes(buffers.triangles), meshlet_trianglesp); for (var i = 0; i < buffers.meshletCount; ++i) { var vertex_offset = buffers.meshlets[i * 4 + 0]; var triangle_offset = buffers.meshlets[i * 4 + 0 + 1]; var triangle_count = buffers.meshlets[i * 4 + 0 + 3]; instance.exports.meshopt_computeMeshletBounds( resultp, meshlet_verticesp + vertex_offset * 4, meshlet_trianglesp + triangle_offset, triangle_count, verticesp, vertex_count, vertex_positions_stride ); results.push(extractBounds(resultp)); } // reset memory sbrk(verticesp - sbrk(0)); return results; } function computeClusterBounds(indices, vertex_positions, vertex_count, vertex_positions_stride) { var sbrk = instance.exports.sbrk; // allocate memory var resultp = sbrk(BOUNDS_SIZE); var indicesp = sbrk(indices.byteLength); var verticesp = sbrk(vertex_positions.byteLength); // copy input data to wasm memory var heap = new Uint8Array(instance.exports.memory.buffer); heap.set(bytes(indices), indicesp); heap.set(bytes(vertex_positions), verticesp); instance.exports.meshopt_computeClusterBounds(resultp, indicesp, indices.length, verticesp, vertex_count, vertex_positions_stride); var result = extractBounds(resultp); // reset memory sbrk(resultp - sbrk(0)); return result; } function computeSphereBounds(positions, count, positions_stride, radii, radii_stride) { var sbrk = instance.exports.sbrk; // allocate memory var resultp = sbrk(BOUNDS_SIZE); var positionsp = sbrk(positions.byteLength); var radiip = radii ? sbrk(radii.byteLength) : 0; // copy input data to wasm memory var heap = new Uint8Array(instance.exports.memory.buffer); heap.set(bytes(positions), positionsp); if (radii) { heap.set(bytes(radii), radiip); } instance.exports.meshopt_computeSphereBounds(resultp, positionsp, count, positions_stride, radiip, radii ? radii_stride : 0); var result = extractBounds(resultp); // reset memory sbrk(resultp - sbrk(0)); return result; } return { ready: ready, supported: true, buildMeshlets: function (indices, vertex_positions, vertex_positions_stride, max_vertices, max_triangles, cone_weight) { assert(indices.length % 3 == 0); assert(vertex_positions instanceof Float32Array); assert(vertex_positions.length % vertex_positions_stride == 0); assert(vertex_positions_stride >= 3); assert(max_vertices <= 256 || max_vertices > 0); assert(max_triangles <= 512); assert(max_triangles % 4 == 0); cone_weight = cone_weight || 0.0; var indices32 = indices.BYTES_PER_ELEMENT == 4 ? indices : new Uint32Array(indices); return buildMeshlets( indices32, vertex_positions, vertex_positions.length / vertex_positions_stride, vertex_positions_stride * 4, max_vertices, max_triangles, cone_weight ); }, extractMeshlet: function (buffers, index) { assert(index >= 0 && index < buffers.meshletCount); return extractMeshlet(buffers, index); }, computeClusterBounds: function (indices, vertex_positions, vertex_positions_stride) { assert(indices.length % 3 == 0); assert(indices.length / 3 <= 512); assert(vertex_positions instanceof Float32Array); assert(vertex_positions.length % vertex_positions_stride == 0); assert(vertex_positions_stride >= 3); var indices32 = indices.BYTES_PER_ELEMENT == 4 ? indices : new Uint32Array(indices); return computeClusterBounds(indices32, vertex_positions, vertex_positions.length / vertex_positions_stride, vertex_positions_stride * 4); }, computeMeshletBounds: function (buffers, vertex_positions, vertex_positions_stride) { assert(buffers.meshletCount != 0); assert(vertex_positions instanceof Float32Array); assert(vertex_positions.length % vertex_positions_stride == 0); assert(vertex_positions_stride >= 3); return computeMeshletBounds(buffers, vertex_positions, vertex_positions.length / vertex_positions_stride, vertex_positions_stride * 4); }, computeSphereBounds: function (positions, positions_stride, radii, radii_stride) { assert(positions instanceof Float32Array); assert(positions.length % positions_stride == 0); assert(positions_stride >= 3); assert(!radii || radii instanceof Float32Array); assert(!radii || radii.length % radii_stride == 0); assert(!radii || radii_stride >= 1); assert(!radii || positions.length / positions_stride == radii.length / radii_stride); radii_stride = radii_stride || 0; return computeSphereBounds(positions, positions.length / positions_stride, positions_stride * 4, radii, radii_stride * 4); }, }; })(); export { MeshoptClusterizer };