185 lines
5.6 KiB
HTML
185 lines
5.6 KiB
HTML
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<body>
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<input type="file">
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<script>
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const isLittleEndian = () => {
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const arrayBuffer = new ArrayBuffer(2);
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const uint8Array = new Uint8Array(arrayBuffer);
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const uint16array = new Uint16Array(arrayBuffer);
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uint8Array[0] = 0xAA;
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uint8Array[1] = 0xBB;
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return uint16array[0] === 0xBBAA;
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}
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const swapToBigEndian = (buffer) => {
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if (!isLittleEndian()) return buffer
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const view = new DataView(buffer);
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for (let i = 0; i < buffer.byteLength; i += 4) {
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const value = view.getUint32(i, false)
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view.setUint32(i, value, true)
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}
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return buffer;
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}
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const readBINOBJ = async file => {
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const buffer = swapToBigEndian(await file.arrayBuffer())
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const intArray = new Int32Array(buffer)
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const floatArray = new Float32Array(buffer)
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let position = 0
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const readInt = () => intArray[position++]
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const readFloat = () => floatArray[position++]
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let n
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n = readInt()
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const vertices = []
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for (let i = 0; i < n; ++i) {
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vertices.push(readFloat())
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}
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n = readInt()
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const textures = []
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for (let i = 0; i < n; ++i) {
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textures.push(readFloat())
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}
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n = readInt()
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const normals = []
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for (let i = 0; i < n; ++i) {
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normals.push(readFloat())
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}
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n = readInt()
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const faceIndexes = []
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for (let i = 0; i < n; ++i) {
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faceIndexes.push([
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readInt(), // vertex index
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readInt(), // texture index
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readInt() // normal index
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])
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}
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console.log(position, intArray.length)
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return {
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vertices,
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textures,
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normals,
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faceIndexes
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}
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}
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const writeBINOBJ = ({ vertices, textures, normals, faceIndexes }) => {
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const datasize = 4 + 4 * vertices.length + 4 + 4 * textures.length + 4 + 4 * normals.length + 4 + 4 * 3 * faceIndexes.length
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const buffer = new ArrayBuffer(datasize)
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const view = new DataView(buffer)
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let position = 0
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view.setInt32(4 * (position++), vertices.length, false)
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for (const v of vertices)
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view.setFloat32(4 * (position++), v, false)
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view.setInt32(4 * (position++), textures.length, false)
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for (const vt of textures)
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view.setFloat32(4 * (position++), vt, false)
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view.setInt32(4 * (position++), normals.length, false)
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for (const vn of normals)
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view.setFloat32(4 * (position++), vn, false)
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view.setInt32(4 * (position++), faceIndexes.length, false)
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for (const [vi, vti, vni] of faceIndexes) {
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view.setInt32(4 * (position++), vi, false)
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view.setInt32(4 * (position++), vti, false)
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view.setInt32(4 * (position++), vni, false)
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}
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return buffer
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}
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const readOBJ = async file => {
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const text = await file.text()
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const vertices = []
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const textures = []
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const normals = []
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const faceIndexes = []
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const lines = text.split('\n')
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for (const line of lines) {
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const args = line.split(' ')
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if (args[0] == 'v') {
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vertices.push(parseFloat(args[1]), parseFloat(args[2]), parseFloat(args[3]))
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} else if (args[0] == 'vt') {
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textures.push(parseFloat(args[1]), parseFloat(args[2]))
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} else if (args[0] == 'vn') {
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normals.push(parseFloat(args[1]), parseFloat(args[2]), parseFloat(args[3]))
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} else if (args[0] == 'f') {
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const i1 = args[1].split('/')
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const i2 = args[2].split('/')
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const i3 = args[3].split('/')
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faceIndexes.push([
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i1[0] - 1,
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i1[1] - 1,
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i1[2] - 1,
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], [
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i2[0] - 1,
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i2[1] - 1,
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i2[2] - 1
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], [
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i3[0] - 1,
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i3[1] - 1,
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i3[2] - 1
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])
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}
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}
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return {
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vertices,
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textures,
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normals,
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faceIndexes
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}
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}
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const writeOBJ = ({ vertices, textures, normals, faceIndexes }) => {
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let text = ""
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for (let i = 0; i < vertices.length / 3; ++i) {
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text += "v " + vertices[3 * i] + " " + vertices[3 * i + 1] + " " + vertices[3 * i + 2] + "\n"
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}
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for (let i = 0; i < textures.length / 2; ++i) {
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text += "vt " + textures[2 * i] + " " + textures[2 * i + 1] + "\n"
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}
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for (let i = 0; i < normals.length / 3; ++i) {
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text += "vn " + normals[3 * i] + " " + normals[3 * i + 1] + " " + normals[3 * i + 2] + "\n"
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}
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for (let i = 0; i < faceIndexes.length / 3; ++i) {
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text += "f " +
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(1 + faceIndexes[3 * i][0]) + "/" + (1 + faceIndexes[3 * i][1]) + "/" + (1 + faceIndexes[3 * i][2]) + " " +
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(1 + faceIndexes[3 * i + 1][0]) + "/" + (2 + faceIndexes[3 * i + 1][1]) + "/" + (1 + faceIndexes[3 * i + 1][2])+ " " +
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(1 + faceIndexes[3 * i + 2][0]) + "/" + (3 + faceIndexes[3 * i + 2][1]) + "/" + (1 + faceIndexes[3 * i + 2][2])+
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"\n"
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}
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return text
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}
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const save = (blob, filename) => {
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const a = document.createElement('a')
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a.download = filename
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a.href = window.URL.createObjectURL(blob);
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document.body.appendChild(a)
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a.click()
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document.body.removeChild(a)
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}
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const input = document.querySelector("input")
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input.addEventListener('change', async () => {
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const file = input.files[0]
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if (file.name.endsWith('.binobj')) {
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save(new Blob([ writeOBJ(await readBINOBJ(file)) ], { type: 'text/plain' }), file.name.substring(0, file.name.length - 7) + '.obj')
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} else if (file.name.endsWith('.obj')) {
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console.log(await readOBJ(file))
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save(new Blob([ writeBINOBJ(await readOBJ(file)) ], { type: 'text/plain' }), file.name.substring(0, file.name.length - 4) + '.binobj')
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}
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})
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</script>
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</body>
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