itowns
Version:
A JS/WebGL framework for 3D geospatial data visualization
205 lines (161 loc) • 6.89 kB
JavaScript
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.DDSLoader = void 0;
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _inherits2 = _interopRequireDefault(require("@babel/runtime/helpers/inherits"));
var _possibleConstructorReturn2 = _interopRequireDefault(require("@babel/runtime/helpers/possibleConstructorReturn"));
var _getPrototypeOf2 = _interopRequireDefault(require("@babel/runtime/helpers/getPrototypeOf"));
var _three = require("three");
function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = (0, _getPrototypeOf2["default"])(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = (0, _getPrototypeOf2["default"])(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return (0, _possibleConstructorReturn2["default"])(this, result); }; }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
var DDSLoader = /*#__PURE__*/function (_CompressedTextureLoa) {
(0, _inherits2["default"])(DDSLoader, _CompressedTextureLoa);
var _super = _createSuper(DDSLoader);
function DDSLoader(manager) {
(0, _classCallCheck2["default"])(this, DDSLoader);
return _super.call(this, manager);
}
(0, _createClass2["default"])(DDSLoader, [{
key: "parse",
value: function parse(buffer, loadMipmaps) {
var dds = {
mipmaps: [],
width: 0,
height: 0,
format: null,
mipmapCount: 1
}; // Adapted from @toji's DDS utils
// https://github.com/toji/webgl-texture-utils/blob/master/texture-util/dds.js
// All values and structures referenced from:
// http://msdn.microsoft.com/en-us/library/bb943991.aspx/
// let DDPF_RGB = 0x40;
// let DDPF_YUV = 0x200;
// let DDPF_LUMINANCE = 0x20000;
function fourCCToInt32(value) {
return value.charCodeAt(0) + (value.charCodeAt(1) << 8) + (value.charCodeAt(2) << 16) + (value.charCodeAt(3) << 24);
}
function int32ToFourCC(value) {
return String.fromCharCode(value & 0xff, value >> 8 & 0xff, value >> 16 & 0xff, value >> 24 & 0xff);
}
function loadARGBMip(buffer, dataOffset, width, height) {
var dataLength = width * height * 4;
var srcBuffer = new Uint8Array(buffer, dataOffset, dataLength);
var byteArray = new Uint8Array(dataLength);
var dst = 0;
var src = 0;
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
var b = srcBuffer[src];
src++;
var g = srcBuffer[src];
src++;
var r = srcBuffer[src];
src++;
var a = srcBuffer[src];
src++;
byteArray[dst] = r;
dst++; //r
byteArray[dst] = g;
dst++; //g
byteArray[dst] = b;
dst++; //b
byteArray[dst] = a;
dst++; //a
}
}
return byteArray;
}
var FOURCC_DXT1 = fourCCToInt32('DXT1');
var FOURCC_DXT3 = fourCCToInt32('DXT3');
var FOURCC_DXT5 = fourCCToInt32('DXT5');
var FOURCC_ETC1 = fourCCToInt32('ETC1');
// let off_caps3 = 29;
// let off_caps4 = 30;
// Parse header
var header = new Int32Array(buffer, 0, 31);
if (header[0] !== 0x20534444) {
console.error('THREE.DDSLoader.parse: Invalid magic number in DDS header.');
return dds;
}
if (!header[20] & 0x4) {
console.error('THREE.DDSLoader.parse: Unsupported format, must contain a FourCC code.');
return dds;
}
var blockBytes;
var fourCC = header[21];
var isRGBAUncompressed = false;
switch (fourCC) {
case FOURCC_DXT1:
blockBytes = 8;
dds.format = _three.RGB_S3TC_DXT1_Format;
break;
case FOURCC_DXT3:
blockBytes = 16;
dds.format = _three.RGBA_S3TC_DXT3_Format;
break;
case FOURCC_DXT5:
blockBytes = 16;
dds.format = _three.RGBA_S3TC_DXT5_Format;
break;
case FOURCC_ETC1:
blockBytes = 8;
dds.format = _three.RGB_ETC1_Format;
break;
default:
if (header[22] === 32 && header[23] & 0xff0000 && header[24] & 0xff00 && header[25] & 0xff && header[26] & 0xff000000) {
isRGBAUncompressed = true;
blockBytes = 64;
dds.format = _three.RGBAFormat;
} else {
console.error('THREE.DDSLoader.parse: Unsupported FourCC code ', int32ToFourCC(fourCC));
return dds;
}
}
dds.mipmapCount = 1;
if (header[2] & 0x20000 && loadMipmaps !== false) {
dds.mipmapCount = Math.max(1, header[7]);
}
var caps2 = header[28];
dds.isCubemap = caps2 & 0x200 ? true : false;
if (dds.isCubemap && (!(caps2 & 0x400) || !(caps2 & 0x800) || !(caps2 & 0x1000) || !(caps2 & 0x2000) || !(caps2 & 0x4000) || !(caps2 & 0x8000))) {
console.error('THREE.DDSLoader.parse: Incomplete cubemap faces');
return dds;
}
dds.width = header[4];
dds.height = header[3];
var dataOffset = header[1] + 4; // Extract mipmaps buffers
var faces = dds.isCubemap ? 6 : 1;
for (var face = 0; face < faces; face++) {
var width = dds.width;
var height = dds.height;
for (var i = 0; i < dds.mipmapCount; i++) {
var byteArray = void 0,
dataLength = void 0;
if (isRGBAUncompressed) {
byteArray = loadARGBMip(buffer, dataOffset, width, height);
dataLength = byteArray.length;
} else {
dataLength = Math.max(4, width) / 4 * Math.max(4, height) / 4 * blockBytes;
byteArray = new Uint8Array(buffer, dataOffset, dataLength);
}
var mipmap = {
'data': byteArray,
'width': width,
'height': height
};
dds.mipmaps.push(mipmap);
dataOffset += dataLength;
width = Math.max(width >> 1, 1);
height = Math.max(height >> 1, 1);
}
}
return dds;
}
}]);
return DDSLoader;
}(_three.CompressedTextureLoader);
exports.DDSLoader = DDSLoader;