Doni/ModelHandle
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Write all textures in the same buffer during gltf binary export.

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This commit is contained in:
Viktor Kovacs 2021-03-28 15:01:54 +02:00
parent 4a3649e8f1
commit e86486e314
1 changed files with 23 additions and 20 deletions
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43
source/export/exportergltf.js
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@ -78,12 +78,9 @@ OV.ExporterGltf = class extends OV.ExporterBase
let meshDataArr = this.GetMeshData (model);
let mainBuffer = this.GetMainBuffer (meshDataArr);
let mainJson = this.GetMainJson (meshDataArr);
mainJson.buffers.push ({
byteLength : mainBuffer.byteLength
});
let textureBuffers = [];
let obj = this;
let mainBufferSize = mainBuffer.byteLength;
let fileNameToIndex = [];
this.ExportMaterials (model, mainJson, function (texture) {
@ -91,20 +88,17 @@ OV.ExporterGltf = class extends OV.ExporterBase
let extension = OV.GetFileExtension (texture.name);
let textureIndex = fileNameToIndex[fileName];
if (textureIndex === undefined) {
let bufferIndex = mainJson.buffers.length;
let bufferViewIndex = mainJson.bufferViews.length;
textureIndex = mainJson.textures.length;
fileNameToIndex[fileName] = textureIndex;
let textureBuffer = texture.buffer;
textureBuffers.push (textureBuffer);
mainJson.buffers.push ({
byteLength : textureBuffer.byteLength
});
mainJson.bufferViews.push ({
buffer : bufferIndex,
byteOffset : 0,
buffer : 0,
byteOffset : mainBufferSize,
byteLength : textureBuffer.byteLength
});
mainBufferSize += textureBuffer.byteLength;
mainJson.images.push ({
bufferView : bufferViewIndex,
mimeType : 'image/' + extension
@ -116,10 +110,15 @@ OV.ExporterGltf = class extends OV.ExporterBase
return textureIndex;
});
mainJson.buffers.push ({
byteLength : mainBufferSize
});
let mainJsonString = JSON.stringify (mainJson, null, 4);
let glbSize = 12 + 8 + mainJsonString.length;
for (let i = 0; i < mainJson.buffers.length; i++) {
glbSize += 8 + mainJson.buffers[i].byteLength;
let glbSize = 12 + 8 + mainJsonString.length + 8 + mainBuffer.byteLength;
for (let i = 0; i < textureBuffers.length; i++) {
let textureBuffer = textureBuffers[i];
glbSize += textureBuffer.byteLength;
}
let glbWriter = new OV.BinaryWriter (glbSize, true);
@ -134,14 +133,12 @@ OV.ExporterGltf = class extends OV.ExporterBase
glbWriter.WriteUnsignedCharacter8 (mainJsonString.charCodeAt (i));
}
glbWriter.WriteUnsignedInteger32 (mainBuffer.byteLength);
glbWriter.WriteUnsignedInteger32 (mainBufferSize);
glbWriter.WriteUnsignedInteger32 (0x004E4942);
glbWriter.WriteArrayBuffer (mainBuffer);
for (let i = 0; i < textureBuffers.length; i++) {
let textureBuffer = textureBuffers[i];
glbWriter.WriteUnsignedInteger32 (textureBuffer.byteLength);
glbWriter.WriteUnsignedInteger32 (0x004E4942);
glbWriter.WriteArrayBuffer (textureBuffer);
}
@ -343,11 +340,18 @@ OV.ExporterGltf = class extends OV.ExporterBase
}
let textureIndex = addTexture (texture);
let textureParams = {
let textureParams = {
index : textureIndex
};
if (texture.HasTransformation ()) {
let extensionName = 'KHR_texture_transform';
if (mainJson.extensionsUsed === undefined) {
mainJson.extensionsUsed = [];
}
if (mainJson.extensionsUsed.indexOf (extensionName) === -1) {
mainJson.extensionsUsed.push (extensionName);
}
textureParams.extensions = {
KHR_texture_transform : {
offset : [texture.offset.x, -texture.offset.y],
@ -368,12 +372,11 @@ OV.ExporterGltf = class extends OV.ExporterBase
roughnessFactor : 1.0
},
emissiveFactor : ColorToRGB (material.emissive),
alphaMode : 'OPAQUE',
alphaCutoff : material.alphaTest
alphaMode : 'OPAQUE'
};
if (material.transparent) {
// TODO: mask?
// TODO: mask, alphaCutoff?
jsonMaterial.alphaMode = 'BLEND';
}