meshopt_decoder.module.js 24 KB

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  1. // This file is part of meshoptimizer library and is distributed under the terms of MIT License.
  2. // Copyright (C) 2016-2022, by Arseny Kapoulkine (arseny.kapoulkine@gmail.com)
  3. var MeshoptDecoder = (function() {
  4. "use strict";
  5. // Built with clang version 14.0.4
  6. // Built from meshoptimizer 0.18
  7. var wasm_base = 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  8. var wasm_simd = 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  9. var detector = new Uint8Array([0,97,115,109,1,0,0,0,1,4,1,96,0,0,3,3,2,0,0,5,3,1,0,1,12,1,0,10,22,2,12,0,65,0,65,0,65,0,252,10,0,0,11,7,0,65,0,253,15,26,11]);
  10. 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]);
  11. if (typeof WebAssembly !== 'object') {
  12. return {
  13. supported: false,
  14. };
  15. }
  16. var wasm = WebAssembly.validate(detector) ? wasm_simd : wasm_base;
  17. var instance;
  18. var ready =
  19. WebAssembly.instantiate(unpack(wasm), {})
  20. .then(function(result) {
  21. instance = result.instance;
  22. instance.exports.__wasm_call_ctors();
  23. });
  24. function unpack(data) {
  25. var result = new Uint8Array(data.length);
  26. for (var i = 0; i < data.length; ++i) {
  27. var ch = data.charCodeAt(i);
  28. result[i] = ch > 96 ? ch - 97 : ch > 64 ? ch - 39 : ch + 4;
  29. }
  30. var write = 0;
  31. for (var i = 0; i < data.length; ++i) {
  32. result[write++] = (result[i] < 60) ? wasmpack[result[i]] : (result[i] - 60) * 64 + result[++i];
  33. }
  34. return result.buffer.slice(0, write);
  35. }
  36. function decode(fun, target, count, size, source, filter) {
  37. var sbrk = instance.exports.sbrk;
  38. var count4 = (count + 3) & ~3;
  39. var tp = sbrk(count4 * size);
  40. var sp = sbrk(source.length);
  41. var heap = new Uint8Array(instance.exports.memory.buffer);
  42. heap.set(source, sp);
  43. var res = fun(tp, count, size, sp, source.length);
  44. if (res == 0 && filter) {
  45. filter(tp, count4, size);
  46. }
  47. target.set(heap.subarray(tp, tp + count * size));
  48. sbrk(tp - sbrk(0));
  49. if (res != 0) {
  50. throw new Error("Malformed buffer data: " + res);
  51. }
  52. }
  53. var filters = {
  54. NONE: "",
  55. OCTAHEDRAL: "meshopt_decodeFilterOct",
  56. QUATERNION: "meshopt_decodeFilterQuat",
  57. EXPONENTIAL: "meshopt_decodeFilterExp",
  58. };
  59. var decoders = {
  60. ATTRIBUTES: "meshopt_decodeVertexBuffer",
  61. TRIANGLES: "meshopt_decodeIndexBuffer",
  62. INDICES: "meshopt_decodeIndexSequence",
  63. };
  64. var workers = [];
  65. var requestId = 0;
  66. function createWorker(url) {
  67. var worker = {
  68. object: new Worker(url),
  69. pending: 0,
  70. requests: {}
  71. };
  72. worker.object.onmessage = function(event) {
  73. var data = event.data;
  74. worker.pending -= data.count;
  75. worker.requests[data.id][data.action](data.value);
  76. delete worker.requests[data.id];
  77. };
  78. return worker;
  79. }
  80. function initWorkers(count) {
  81. var source =
  82. "var instance; var ready = WebAssembly.instantiate(new Uint8Array([" + new Uint8Array(unpack(wasm)) + "]), {})" +
  83. ".then(function(result) { instance = result.instance; instance.exports.__wasm_call_ctors(); });" +
  84. "self.onmessage = workerProcess;" +
  85. decode.toString() + workerProcess.toString();
  86. var blob = new Blob([source], {type: 'text/javascript'});
  87. var url = URL.createObjectURL(blob);
  88. for (var i = 0; i < count; ++i) {
  89. workers[i] = createWorker(url);
  90. }
  91. URL.revokeObjectURL(url);
  92. }
  93. function decodeWorker(count, size, source, mode, filter) {
  94. var worker = workers[0];
  95. for (var i = 1; i < workers.length; ++i) {
  96. if (workers[i].pending < worker.pending) {
  97. worker = workers[i];
  98. }
  99. }
  100. return new Promise(function (resolve, reject) {
  101. var data = new Uint8Array(source);
  102. var id = requestId++;
  103. worker.pending += count;
  104. worker.requests[id] = { resolve: resolve, reject: reject };
  105. worker.object.postMessage({ id: id, count: count, size: size, source: data, mode: mode, filter: filter }, [ data.buffer ]);
  106. });
  107. }
  108. function workerProcess(event) {
  109. ready.then(function() {
  110. var data = event.data;
  111. try {
  112. var target = new Uint8Array(data.count * data.size);
  113. decode(instance.exports[data.mode], target, data.count, data.size, data.source, instance.exports[data.filter]);
  114. self.postMessage({ id: data.id, count: data.count, action: "resolve", value: target }, [ target.buffer ]);
  115. } catch (error) {
  116. self.postMessage({ id: data.id, count: data.count, action: "reject", value: error });
  117. }
  118. });
  119. }
  120. return {
  121. ready: ready,
  122. supported: true,
  123. useWorkers: function(count) {
  124. initWorkers(count);
  125. },
  126. decodeVertexBuffer: function(target, count, size, source, filter) {
  127. decode(instance.exports.meshopt_decodeVertexBuffer, target, count, size, source, instance.exports[filters[filter]]);
  128. },
  129. decodeIndexBuffer: function(target, count, size, source) {
  130. decode(instance.exports.meshopt_decodeIndexBuffer, target, count, size, source);
  131. },
  132. decodeIndexSequence: function(target, count, size, source) {
  133. decode(instance.exports.meshopt_decodeIndexSequence, target, count, size, source);
  134. },
  135. decodeGltfBuffer: function(target, count, size, source, mode, filter) {
  136. decode(instance.exports[decoders[mode]], target, count, size, source, instance.exports[filters[filter]]);
  137. },
  138. decodeGltfBufferAsync: function(count, size, source, mode, filter) {
  139. if (workers.length > 0) {
  140. return decodeWorker(count, size, source, decoders[mode], filters[filter]);
  141. }
  142. return ready.then(function() {
  143. var target = new Uint8Array(count * size);
  144. decode(instance.exports[decoders[mode]], target, count, size, source, instance.exports[filters[filter]]);
  145. return target;
  146. });
  147. }
  148. };
  149. })();
  150. export { MeshoptDecoder };