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Add support for GLB Draco Mesh Compression #97

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kovacsv 2021-07-15 23:37:07 +02:00
parent 265da7548d
commit ab0d0172e7
8 changed files with 520 additions and 49 deletions
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1
.eslintrc.json
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@ -8,6 +8,7 @@
"OV": "writable",
"$": "readonly",
"THREE": "readonly",
"DracoDecoderModule": "readonly",
"rhino3dm": "readonly",
"IfcAPI": "readonly"
},

252
libs/draco.license.md Normal file
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@ -0,0 +1,252 @@
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52
libs/draco_decoder.js Normal file
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libs/draco_decoder.wasm Normal file
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238
source/import/importergltf.js
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@ -257,9 +257,34 @@ OV.GltfExtensions = class
constructor ()
{
this.supportedExtensions = [
'KHR_draco_mesh_compression',
'KHR_materials_pbrSpecularGlossiness',
'KHR_texture_transform',
];
this.draco = null;
}
LoadLibraries (extensionsRequired, onReady)
{
if (extensionsRequired === undefined) {
onReady ();
return;
}
if (this.draco === null && extensionsRequired.indexOf ('KHR_draco_mesh_compression') !== -1) {
OV.LoadExternalLibrary ('draco_decoder.js', {
success : () => {
DracoDecoderModule ().then ((draco) => {
this.draco = draco;
onReady ();
});
},
error : () => {
onReady ();
}
});
} else {
onReady ();
}
}
GetUnsupportedExtensions (extensionsRequired)
@ -341,6 +366,110 @@ OV.GltfExtensions = class
}
}
}
ProcessPrimitive (importer, gltf, primitive, mesh)
{
function EnumerateComponents (draco, decoder, dracoMesh, attributeId, processor)
{
let attribute = decoder.GetAttributeByUniqueId (dracoMesh, attributeId);
let numComponents = attribute.num_components ();
let numPoints = dracoMesh.num_points ();
let numValues = numPoints * numComponents;
let dataSize = numValues * 4;
let attributePtr = draco._malloc (dataSize);
decoder.GetAttributeDataArrayForAllPoints (dracoMesh, attribute, draco.DT_FLOAT32, dataSize, attributePtr);
let attributeArray = new Float32Array (draco.HEAPF32.buffer, attributePtr, numValues).slice ();
if (numComponents === 2) {
for (let i = 0; i < attributeArray.length; i += 2) {
processor (new OV.Coord2D (
attributeArray[i + 0],
attributeArray[i + 1]
));
}
} else if (numComponents === 3) {
for (let i = 0; i < attributeArray.length; i += 3) {
processor (new OV.Coord3D (
attributeArray[i + 0],
attributeArray[i + 1],
attributeArray[i + 2]
));
}
}
draco._free (attributePtr);
}
if (this.draco === null) {
return false;
}
if (primitive.extensions === undefined || primitive.extensions.KHR_draco_mesh_compression === undefined) {
return false;
}
let decoder = new this.draco.Decoder ();
let decoderBuffer = new this.draco.DecoderBuffer ();
let extensionParams = primitive.extensions.KHR_draco_mesh_compression;
let compressedBufferView = gltf.bufferViews[extensionParams.bufferView];
let compressedReader = importer.GetReaderFromBufferView (compressedBufferView);
let compressedArrayBuffer = compressedReader.ReadArrayBuffer (compressedBufferView.byteLength);
decoderBuffer.Init (new Int8Array (compressedArrayBuffer), compressedArrayBuffer.byteLength);
let geometryType = decoder.GetEncodedGeometryType (decoderBuffer);
if (geometryType !== this.draco.TRIANGULAR_MESH) {
return true;
}
let dracoMesh = new this.draco.Mesh ();
let decodingStatus = decoder.DecodeBufferToMesh (decoderBuffer, dracoMesh);
if (!decodingStatus.ok ()) {
return true;
}
let hasVertices = (extensionParams.attributes.POSITION !== undefined);
let hasNormals = (extensionParams.attributes.NORMAL !== undefined);
let hasUVs = (extensionParams.attributes.TEXCOORD_0 !== undefined);
if (!hasVertices) {
return true;
}
let vertexOffset = mesh.VertexCount ();
let normalOffset = mesh.NormalCount ();
let uvOffset = mesh.TextureUVCount ();
EnumerateComponents (this.draco, decoder, dracoMesh, extensionParams.attributes.POSITION, (vertex) => {
mesh.AddVertex (vertex);
});
if (hasNormals) {
EnumerateComponents (this.draco, decoder, dracoMesh, extensionParams.attributes.NORMAL, (normal) => {
mesh.AddNormal (normal);
});
}
if (hasUVs) {
EnumerateComponents (this.draco, decoder, dracoMesh, extensionParams.attributes.TEXCOORD_0, (uv) => {
uv.y = -uv.y;
mesh.AddTextureUV (uv);
});
}
let faceCount = dracoMesh.num_faces ();
let indexCount = faceCount * 3;
let indexDataSize = indexCount * 4;
let indexDataPtr = this.draco._malloc (indexDataSize);
decoder.GetTrianglesUInt32Array (dracoMesh, indexDataSize, indexDataPtr);
let indexArray = new Uint32Array (this.draco.HEAPU32.buffer, indexDataPtr, indexCount).slice ();
for (let i = 0; i < indexArray.length; i += 3) {
let v0 = indexArray[i];
let v1 = indexArray[i + 1];
let v2 = indexArray[i + 2];
importer.AddTriangle (primitive, mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
}
this.draco._free (indexDataPtr);
return true;
}
};
OV.ImporterGltf = class extends OV.ImporterBase
@ -348,6 +477,7 @@ OV.ImporterGltf = class extends OV.ImporterBase
constructor ()
{
super ();
this.gltfExtensions = new OV.GltfExtensions ();
}
CanImportExtension (extension)
@ -372,33 +502,31 @@ OV.ImporterGltf = class extends OV.ImporterBase
ClearContent ()
{
this.bufferContents = null;
this.gltfExtensions = null;
this.imageIndexToTextureParams = null;
}
ResetContent ()
{
this.bufferContents = [];
this.gltfExtensions = new OV.GltfExtensions ();
this.imageIndexToTextureParams = {};
}
ImportContent (fileContent, onFinish)
{
if (this.extension === 'gltf') {
this.ProcessGltf (fileContent);
this.ProcessGltf (fileContent, onFinish);
} else if (this.extension === 'glb') {
this.ProcessBinaryGltf (fileContent);
this.ProcessBinaryGltf (fileContent, onFinish);
}
onFinish ();
}
ProcessGltf (fileContent)
ProcessGltf (fileContent, onFinish)
{
let gltf = JSON.parse (fileContent);
if (gltf.asset.version !== '2.0') {
this.SetError ();
this.SetMessage ('Invalid glTF version.');
onFinish ();
return;
}
@ -417,15 +545,16 @@ OV.ImporterGltf = class extends OV.ImporterBase
if (buffer === null) {
this.SetError ();
this.SetMessage ('One of the requested buffers is missing.');
onFinish ();
return;
}
this.bufferContents.push (buffer);
}
this.ProcessMainFile (gltf);
this.ProcessMainFile (gltf, onFinish);
}
ProcessBinaryGltf (fileContent)
ProcessBinaryGltf (fileContent, onFinish)
{
function ReadChunk (reader)
{
@ -443,18 +572,21 @@ OV.ImporterGltf = class extends OV.ImporterBase
if (magic !== OV.GltfConstants.GLTF_STRING) {
this.SetError ();
this.SetMessage ('Invalid glTF file.');
onFinish ();
return;
}
let version = reader.ReadUnsignedInteger32 ();
if (version !== 2) {
this.SetError ();
this.SetMessage ('Invalid glTF version.');
onFinish ();
return;
}
let length = reader.ReadUnsignedInteger32 ();
if (length !== reader.GetByteLength ()) {
this.SetError ();
this.SetMessage ('Invalid glTF file.');
onFinish ();
return;
}
@ -470,40 +602,46 @@ OV.ImporterGltf = class extends OV.ImporterBase
if (gltfTextContent !== null) {
let gltf = JSON.parse (gltfTextContent);
this.ProcessMainFile (gltf);
this.ProcessMainFile (gltf, onFinish);
}
}
ProcessMainFile (gltf)
ProcessMainFile (gltf, onFinish)
{
this.ImportModelProperties (gltf);
let unsupportedExtensions = this.gltfExtensions.GetUnsupportedExtensions (gltf.extensionsRequired);
if (unsupportedExtensions.length > 0) {
this.SetError ();
this.SetMessage ('Unsupported extension: ' + unsupportedExtensions.join (', ') + '.');
return;
onFinish ();
return;
}
let defaultScene = this.GetDefaultScene (gltf);
if (defaultScene === null) {
this.SetError ();
this.SetMessage ('No default scene found.');
onFinish ();
return;
}
let materials = gltf.materials;
if (materials !== undefined) {
for (let i = 0; i < materials.length; i++) {
this.ImportMaterial (gltf, i);
}
}
this.gltfExtensions.LoadLibraries (gltf.extensionsRequired, () => {
this.ImportModelProperties (gltf);
let nodeTree = this.CollectMeshNodesForScene (gltf, defaultScene);
for (let i = 0; i < nodeTree.nodes.length; i++) {
let nodeIndex = nodeTree.nodes[i];
this.ImportMeshNode (gltf, nodeIndex, nodeTree);
}
let materials = gltf.materials;
if (materials !== undefined) {
for (let i = 0; i < materials.length; i++) {
this.ImportMaterial (gltf, i);
}
}
let nodeTree = this.CollectMeshNodesForScene (gltf, defaultScene);
for (let i = 0; i < nodeTree.nodes.length; i++) {
let nodeIndex = nodeTree.nodes[i];
this.ImportMeshNode (gltf, nodeIndex, nodeTree);
}
onFinish ();
});
}
ImportModelProperties (gltf)
@ -759,27 +897,8 @@ OV.ImporterGltf = class extends OV.ImporterBase
ImportPrimitive (gltf, primitive, mesh)
{
function AddTriangle (mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset)
{
let triangle = new OV.Triangle (vertexOffset + v0, vertexOffset + v1, vertexOffset + v2);
if (hasNormals) {
triangle.SetNormals (
normalOffset + v0,
normalOffset + v1,
normalOffset + v2
);
}
if (hasUVs) {
triangle.SetTextureUVs (
uvOffset + v0,
uvOffset + v1,
uvOffset + v2
);
}
if (primitive.material !== undefined) {
triangle.mat = primitive.material;
}
mesh.AddTriangle (triangle);
if (this.gltfExtensions.ProcessPrimitive (this, gltf, primitive, mesh)) {
return;
}
if (primitive.attributes === undefined) {
@ -860,7 +979,7 @@ OV.ImporterGltf = class extends OV.ImporterBase
let v0 = vertexIndices[i];
let v1 = vertexIndices[i + 1];
let v2 = vertexIndices[i + 2];
AddTriangle (mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
this.AddTriangle (primitive, mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
}
} else if (mode === OV.GltfRenderMode.TRIANGLE_STRIP) {
for (let i = 0; i < vertexIndices.length - 2; i++) {
@ -872,18 +991,41 @@ OV.ImporterGltf = class extends OV.ImporterBase
v1 = v2;
v2 = tmp;
}
AddTriangle (mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
this.AddTriangle (primitive, mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
}
} else if (mode === OV.GltfRenderMode.TRIANGLE_FAN) {
for (let i = 1; i < vertexIndices.length - 1; i++) {
let v0 = vertexIndices[0];
let v1 = vertexIndices[i];
let v2 = vertexIndices[i + 1];
AddTriangle (mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
this.AddTriangle (primitive, mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset);
}
}
}
AddTriangle (primitive, mesh, v0, v1, v2, hasNormals, hasUVs, vertexOffset, normalOffset, uvOffset)
{
let triangle = new OV.Triangle (vertexOffset + v0, vertexOffset + v1, vertexOffset + v2);
if (hasNormals) {
triangle.SetNormals (
normalOffset + v0,
normalOffset + v1,
normalOffset + v2
);
}
if (hasUVs) {
triangle.SetTextureUVs (
uvOffset + v0,
uvOffset + v1,
uvOffset + v2
);
}
if (primitive.material !== undefined) {
triangle.mat = primitive.material;
}
mesh.AddTriangle (triangle);
}
GetReaderFromBufferView (bufferView)
{
let bufferIndex = bufferView.buffer || 0;

3
test/test.js
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@ -3,6 +3,9 @@ process.chdir (__dirname);
require ('./utils/globals.js');
require ('./utils/importall.js');
OV.ExternalLibLocation = '../../libs';
var testDirName = './tests/';
var files = fs.readdirSync (testDirName, { withFileTypes: true });
var i, file;

3
test/tests/importergltf_test.js
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@ -49,7 +49,8 @@ describe ('Gltf Importer', function () {
let testFileList = [
['Box/glTF', 'Box.gltf'],
['Box/glTF-Embedded', 'Box.gltf'],
['Box/glTF-Binary', 'Box.glb']
['Box/glTF-Binary', 'Box.glb'],
['Box/glTF-Draco', 'Box.gltf']
];
let processed = 0;
for (let i = 0; i < testFileList.length; i++) {

20
test/utils/globals.js
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@ -61,3 +61,23 @@ global.FileReader = class
}
}
};
global.document = {
head : {
appendChild : function (element) {
if (element.type === 'text/javascript') {
if (element.src.indexOf ('draco') !== -1) {
global.DracoDecoderModule = require (element.src);
element.onload ();
} else {
element.onerror ();
}
}
}
},
createElement : function (type) {
return {
type : type
};
}
};