2017-08-08 14:23:30 -04:00
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// pathfinder/demo/src/index.ts
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2017-08-10 21:38:54 -04:00
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const base64js = require('base64-js');
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2017-08-08 14:23:30 -04:00
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const opentype = require('opentype.js');
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2017-08-14 19:08:45 -04:00
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const TEXT: string = "G";
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2017-08-10 21:38:54 -04:00
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const FONT_SIZE: number = 16.0;
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const PARTITION_FONT_ENDPOINT_URL: string = "/partition-font";
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2017-08-13 16:39:51 -04:00
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const COMMON_SHADER_URL: string = '/glsl/gles2/common.inc.glsl';
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2017-08-14 19:08:45 -04:00
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const UINT32_SIZE: number = 4;
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const B_POSITION_SIZE: number = 8;
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const B_VERTEX_QUAD_SIZE: number = 8;
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const B_VERTEX_QUAD_PATH_ID_OFFSET: number = 0;
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const B_VERTEX_QUAD_TEX_COORD_OFFSET: number = 4;
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const B_VERTEX_QUAD_SIGN_OFFSET: number = 6;
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const IDENTITY: Matrix4D = [
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1.0, 0.0, 0.0, 0.0,
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0.0, 1.0, 0.0, 0.0,
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0.0, 0.0, 1.0, 0.0,
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0.0, 0.0, 0.0, 1.0,
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];
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const SHADER_URLS: ShaderMap<ShaderProgramURLs> = {
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directCurve: {
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vertex: "/glsl/gles2/direct-curve.vs.glsl",
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fragment: "/glsl/gles2/direct-curve.fs.glsl",
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},
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directInterior: {
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vertex: "/glsl/gles2/direct-interior.vs.glsl",
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fragment: "/glsl/gles2/direct-interior.fs.glsl",
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},
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};
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2017-08-14 19:08:45 -04:00
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interface UnlinkedShaderProgram {
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vertex: WebGLShader;
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fragment: WebGLShader;
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}
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type Matrix4D = number[];
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interface ShaderProgramSource {
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vertex: string;
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fragment: string;
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}
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interface ShaderProgramURLs {
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vertex: string;
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fragment: string;
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}
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2017-08-14 19:08:45 -04:00
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interface ShaderMap<T> {
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directCurve: T;
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directInterior: T;
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}
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interface UniformMap {
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[uniformName: string]: WebGLUniformLocation;
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}
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interface AttributeMap {
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[attributeName: string]: number;
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}
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type ShaderType = number;
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type ShaderTypeName = 'vertex' | 'fragment';
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function expect<T>(value: T | null, message: string): T {
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if (value == null)
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throw new PathfinderError(message);
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return value;
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}
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2017-08-14 19:08:45 -04:00
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function unwrap<T>(value: T | null): T {
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return expect(value, "Unexpected null!");
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}
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2017-08-13 16:39:51 -04:00
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class PathfinderError extends Error {
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constructor(message?: string | undefined) {
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super(message);
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}
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}
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2017-08-14 19:08:45 -04:00
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interface Meshes<T> {
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readonly bQuads: T;
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readonly bVertexPositions: T;
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readonly bVertexInfo: T;
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readonly coverInteriorIndices: T;
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readonly coverCurveIndices: T;
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readonly edgeUpperLineIndices: T;
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readonly edgeUpperCurveIndices: T;
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readonly edgeLowerLineIndices: T;
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readonly edgeLowerCurveIndices: T;
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}
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type BufferType = number;
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const BUFFER_TYPES: Meshes<BufferType> = {
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bQuads: WebGLRenderingContext.ARRAY_BUFFER,
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bVertexPositions: WebGLRenderingContext.ARRAY_BUFFER,
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bVertexInfo: WebGLRenderingContext.ARRAY_BUFFER,
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coverInteriorIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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coverCurveIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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edgeUpperLineIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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edgeUpperCurveIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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edgeLowerLineIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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edgeLowerCurveIndices: WebGLRenderingContext.ELEMENT_ARRAY_BUFFER,
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};
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class PathfinderMeshData implements Meshes<ArrayBuffer> {
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constructor(encodedResponse: string) {
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const response = JSON.parse(encodedResponse);
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if (!('Ok' in response))
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throw new PathfinderError("Failed to partition the font!");
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const meshes = response.Ok;
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for (const bufferName of Object.keys(BUFFER_TYPES) as Array<keyof PathfinderMeshData>)
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this[bufferName] = base64js.toByteArray(meshes[bufferName]).buffer;
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2017-08-08 14:23:30 -04:00
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}
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2017-08-14 19:08:45 -04:00
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readonly bQuads: ArrayBuffer;
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readonly bVertexPositions: ArrayBuffer;
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readonly bVertexInfo: ArrayBuffer;
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readonly coverInteriorIndices: ArrayBuffer;
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readonly coverCurveIndices: ArrayBuffer;
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readonly edgeUpperLineIndices: ArrayBuffer;
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readonly edgeUpperCurveIndices: ArrayBuffer;
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readonly edgeLowerLineIndices: ArrayBuffer;
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readonly edgeLowerCurveIndices: ArrayBuffer;
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}
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class PathfinderMeshBuffers implements Meshes<WebGLBuffer> {
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constructor(gl: WebGLRenderingContext, meshData: PathfinderMeshData) {
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for (const bufferName of Object.keys(BUFFER_TYPES) as Array<keyof PathfinderMeshBuffers>) {
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const bufferType = BUFFER_TYPES[bufferName];
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const buffer = expect(gl.createBuffer(), "Failed to create buffer!");
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gl.bindBuffer(bufferType, buffer);
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gl.bufferData(bufferType, meshData[bufferName], gl.STATIC_DRAW);
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console.log(`${bufferName} has size ${meshData[bufferName].byteLength}`);
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if (bufferName == 'coverInteriorIndices') {
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const typedArray = new Uint32Array(meshData[bufferName]);
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let array = [];
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for (let i = 0; i < typedArray.length; i++)
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array[i] = typedArray[i];
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console.log(array.toString());
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}
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this[bufferName] = buffer;
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}
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}
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readonly bQuads: WebGLBuffer;
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readonly bVertexPositions: WebGLBuffer;
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readonly bVertexInfo: WebGLBuffer;
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readonly coverInteriorIndices: WebGLBuffer;
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readonly coverCurveIndices: WebGLBuffer;
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readonly edgeUpperLineIndices: WebGLBuffer;
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readonly edgeUpperCurveIndices: WebGLBuffer;
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readonly edgeLowerLineIndices: WebGLBuffer;
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readonly edgeLowerCurveIndices: WebGLBuffer;
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}
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class AppController {
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constructor() {}
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start() {
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this.view = new PathfinderView(document.getElementById('pf-canvas') as HTMLCanvasElement);
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this.loadFontButton = document.getElementById('pf-load-font-button') as HTMLInputElement;
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this.loadFontButton.addEventListener('change', () => this.loadFont(), false);
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}
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loadFont() {
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const file = expect(this.loadFontButton.files, "No file selected!")[0];
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const reader = new FileReader;
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reader.addEventListener('loadend', () => {
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this.fontData = reader.result;
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this.fontLoaded();
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}, false);
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reader.readAsArrayBuffer(file);
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}
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fontLoaded() {
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this.font = opentype.parse(this.fontData);
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if (!this.font.supported)
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throw new PathfinderError("The font type is unsupported.");
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const glyphIDs = this.font.stringToGlyphs(TEXT).map((glyph: any) => glyph.index);
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const request = {
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otf: base64js.fromByteArray(new Uint8Array(this.fontData)),
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fontIndex: 0,
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glyphIDs: glyphIDs,
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pointSize: FONT_SIZE,
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};
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2017-08-12 13:08:35 -04:00
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window.fetch(PARTITION_FONT_ENDPOINT_URL, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify(request),
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}).then((response) => {
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response.text().then((encodedMeshes) => {
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this.meshes = new PathfinderMeshData(encodedMeshes);
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this.meshesReceived();
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});
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});
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2017-08-08 14:23:30 -04:00
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}
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meshesReceived() {
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this.view.attachMeshes(this.meshes);
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}
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view: PathfinderView;
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loadFontButton: HTMLInputElement;
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fontData: ArrayBuffer;
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font: any;
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meshes: PathfinderMeshData;
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}
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class PathfinderView {
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constructor(canvas: HTMLCanvasElement) {
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this.canvas = canvas;
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this.initContext();
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this.shaderProgramsPromise = this.loadShaders().then(shaders => this.linkShaders(shaders));
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window.addEventListener('resize', () => this.resizeToFit(), false);
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this.resizeToFit();
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}
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initContext() {
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this.gl = expect(this.canvas.getContext('webgl', { antialias: false, depth: true }),
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"Failed to initialize WebGL! Check that your browser supports it.");
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this.gl.getExtension('OES_element_index_uint');
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}
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loadShaders(): Promise<ShaderMap<UnlinkedShaderProgram>> {
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let shaders: Partial<ShaderMap<Partial<UnlinkedShaderProgram>>> = {};
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return window.fetch(COMMON_SHADER_URL)
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.then((response) => response.text())
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.then((commonSource) => {
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const shaderKeys = Object.keys(SHADER_URLS) as Array<keyof ShaderMap<string>>;
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let promises = [];
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for (const shaderKey of shaderKeys) {
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for (const typeName of ['vertex', 'fragment'] as Array<ShaderTypeName>) {
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const type = {
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vertex: this.gl.VERTEX_SHADER,
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fragment: this.gl.FRAGMENT_SHADER,
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}[typeName];
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const url = SHADER_URLS[shaderKey][typeName];
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promises.push(window.fetch(url)
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.then(response => response.text())
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.then(source => {
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const shader = this.gl.createShader(type);
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if (shader == null)
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throw new PathfinderError("Failed to create shader!");
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this.gl.shaderSource(shader, commonSource + "\n#line 1\n" + source);
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this.gl.compileShader(shader);
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if (this.gl.getShaderParameter(shader, this.gl.COMPILE_STATUS) == 0) {
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const infoLog = this.gl.getShaderInfoLog(shader);
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throw new PathfinderError(`Failed to compile ${typeName} shader ` +
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`"${shaderKey}":\n${infoLog}`);
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}
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if (shaders[shaderKey] == null)
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shaders[shaderKey] = {};
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shaders[shaderKey]![typeName] = shader;
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}));
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}
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}
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return Promise.all(promises);
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}).then(() => shaders as ShaderMap<UnlinkedShaderProgram>);
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}
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linkShaders(shaders: ShaderMap<UnlinkedShaderProgram>):
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Promise<ShaderMap<PathfinderShaderProgram>> {
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return new Promise((resolve, reject) => {
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let shaderProgramMap: Partial<ShaderMap<PathfinderShaderProgram>> = {};
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for (const shaderName of Object.keys(shaders) as
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Array<keyof ShaderMap<UnlinkedShaderProgram>>) {
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shaderProgramMap[shaderName] = new PathfinderShaderProgram(this.gl,
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shaderName,
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shaders[shaderName]);
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}
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resolve(shaderProgramMap as ShaderMap<PathfinderShaderProgram>);
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});
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}
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attachMeshes(meshes: PathfinderMeshData) {
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this.meshes = new PathfinderMeshBuffers(this.gl, meshes);
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this.setDirty();
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}
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setDirty() {
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if (this.dirty)
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return;
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this.dirty = true;
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window.requestAnimationFrame(() => this.redraw());
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}
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resizeToFit() {
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const width = window.innerWidth, height = window.innerHeight - this.canvas.scrollTop;
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const devicePixelRatio = window.devicePixelRatio;
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this.canvas.style.width = width + 'px';
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this.canvas.style.height = height + 'px';
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this.canvas.width = width * devicePixelRatio;
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this.canvas.height = height * devicePixelRatio;
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this.setDirty();
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}
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redraw() {
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this.shaderProgramsPromise.then((shaderPrograms: ShaderMap<PathfinderShaderProgram>) => {
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if (this.meshes == null) {
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this.dirty = false;
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return;
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}
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// Clear.
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this.gl.clearColor(1.0, 1.0, 1.0, 1.0);
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this.gl.clearDepth(0.0);
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this.gl.clear(this.gl.COLOR_BUFFER_BIT | this.gl.DEPTH_BUFFER_BIT);
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// Set up the depth buffer.
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this.gl.depthFunc(this.gl.GREATER);
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this.gl.enable(this.gl.DEPTH_TEST);
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// Set up the implicit cover interior VAO.
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const directInteriorProgram = shaderPrograms.directInterior;
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this.gl.useProgram(directInteriorProgram.program);
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this.gl.bindBuffer(this.gl.ARRAY_BUFFER, this.meshes.bVertexPositions);
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this.gl.vertexAttribPointer(directInteriorProgram.attributes.aPosition,
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2,
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this.gl.FLOAT,
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false,
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0,
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0);
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this.gl.bindBuffer(this.gl.ARRAY_BUFFER, this.meshes.bVertexInfo);
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this.gl.vertexAttribPointer(directInteriorProgram.attributes.aPathDepth,
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1,
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this.gl.UNSIGNED_SHORT, // FIXME(pcwalton)
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true,
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B_VERTEX_QUAD_SIZE,
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B_VERTEX_QUAD_PATH_ID_OFFSET);
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this.gl.enableVertexAttribArray(directInteriorProgram.attributes.aPosition);
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this.gl.enableVertexAttribArray(directInteriorProgram.attributes.aPathDepth);
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this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER, this.meshes.coverInteriorIndices);
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// Draw direct interior parts.
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this.gl.uniformMatrix4fv(directInteriorProgram.uniforms.uTransform, false, IDENTITY);
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|
|
this.gl.uniform2i(directInteriorProgram.uniforms.uFramebufferSize,
|
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|
|
this.canvas.width,
|
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|
|
this.canvas.height);
|
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|
|
const triangleCount =
|
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|
|
this.gl.getBufferParameter(this.gl.ELEMENT_ARRAY_BUFFER, this.gl.BUFFER_SIZE) /
|
|
|
|
UINT32_SIZE;
|
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|
|
this.gl.drawElements(this.gl.TRIANGLES, triangleCount, this.gl.UNSIGNED_INT, 0);
|
|
|
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|
|
// Clear dirty bit and finish.
|
|
|
|
this.dirty = false;
|
|
|
|
});
|
2017-08-08 14:23:30 -04:00
|
|
|
}
|
|
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|
|
|
canvas: HTMLCanvasElement;
|
2017-08-12 00:26:25 -04:00
|
|
|
gl: WebGLRenderingContext;
|
2017-08-14 19:08:45 -04:00
|
|
|
shaderProgramsPromise: Promise<ShaderMap<PathfinderShaderProgram>>;
|
|
|
|
meshes: PathfinderMeshBuffers;
|
|
|
|
dirty: boolean;
|
2017-08-12 00:26:25 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
class PathfinderShaderProgram {
|
2017-08-14 19:08:45 -04:00
|
|
|
constructor(gl: WebGLRenderingContext,
|
|
|
|
programName: string,
|
|
|
|
unlinkedShaderProgram: UnlinkedShaderProgram) {
|
|
|
|
this.program = expect(gl.createProgram(), "Failed to create shader program!");
|
|
|
|
for (const compiledShader of Object.values(unlinkedShaderProgram))
|
|
|
|
gl.attachShader(this.program, compiledShader);
|
|
|
|
gl.linkProgram(this.program);
|
|
|
|
|
|
|
|
if (gl.getProgramParameter(this.program, gl.LINK_STATUS) == 0) {
|
|
|
|
const infoLog = gl.getProgramInfoLog(this.program);
|
|
|
|
throw new PathfinderError(`Failed to link program "${programName}":\n${infoLog}`);
|
|
|
|
}
|
|
|
|
|
|
|
|
const uniformCount = gl.getProgramParameter(this.program, gl.ACTIVE_UNIFORMS);
|
|
|
|
const attributeCount = gl.getProgramParameter(this.program, gl.ACTIVE_ATTRIBUTES);
|
|
|
|
|
|
|
|
let uniforms: UniformMap = {};
|
|
|
|
let attributes: AttributeMap = {};
|
|
|
|
|
|
|
|
for (let uniformIndex = 0; uniformIndex < uniformCount; uniformIndex++) {
|
|
|
|
const uniformName = unwrap(gl.getActiveUniform(this.program, uniformIndex)).name;
|
|
|
|
uniforms[uniformName] = expect(gl.getUniformLocation(this.program, uniformName),
|
|
|
|
`Didn't find uniform "${uniformName}"!`);
|
|
|
|
}
|
|
|
|
for (let attributeIndex = 0; attributeIndex < attributeCount; attributeIndex++) {
|
|
|
|
const attributeName = unwrap(gl.getActiveAttrib(this.program, attributeIndex)).name;
|
|
|
|
attributes[attributeName] = attributeIndex;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.uniforms = uniforms;
|
|
|
|
this.attributes = attributes;
|
2017-08-12 00:26:25 -04:00
|
|
|
}
|
2017-08-14 19:08:45 -04:00
|
|
|
|
|
|
|
readonly uniforms: UniformMap;
|
|
|
|
readonly attributes: AttributeMap;
|
|
|
|
readonly program: WebGLProgram;
|
2017-08-08 14:23:30 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
function main() {
|
|
|
|
const controller = new AppController;
|
|
|
|
window.addEventListener('load', () => controller.start(), false);
|
|
|
|
}
|
|
|
|
|
|
|
|
main();
|