| 1 | {"version":3,"file":"ContextSystem.mjs","sources":["../../src/context/ContextSystem.ts"],"sourcesContent":["import { ENV } from '@pixi/constants';\nimport { extensions, ExtensionType } from '@pixi/extensions';\nimport { settings } from '@pixi/settings';\n\nimport type { ExtensionMetadata } from '@pixi/extensions';\nimport type { ICanvas } from '@pixi/settings';\nimport type { IRenderingContext } from '../IRenderer';\nimport type { Renderer } from '../Renderer';\nimport type { ISystem } from '../system/ISystem';\nimport type { WebGLExtensions } from './WebGLExtensions';\n\nlet CONTEXT_UID_COUNTER = 0;\n\nexport interface ContextSystemOptions\n{\n /**\n * **Deprecated since 7.0.0, use `premultipliedAlpha` and `backgroundAlpha` instead.**\n *\n * Pass-through value for canvas' context attribute `alpha`. This option is for cases where the\n * canvas needs to be opaque, possibly for performance reasons on some older devices.\n * If you want to set transparency, please use `backgroundAlpha`.\n *\n * **WebGL Only:** When set to `'notMultiplied'`, the canvas' context attribute `alpha` will be\n * set to `true` and `premultipliedAlpha` will be to `false`.\n * @deprecated since 7.0.0\n * @memberof PIXI.IRendererOptions\n */\n useContextAlpha?: boolean | 'notMultiplied';\n /**\n * **WebGL Only.** User-provided WebGL rendering context object.\n * @memberof PIXI.IRendererOptions\n */\n context: IRenderingContext | null;\n /**\n * **WebGL Only.** Whether to enable anti-aliasing. 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Enable this if you need to call `toDataUrl` on the WebGL context.\n * @memberof PIXI.IRendererOptions\n */\n preserveDrawingBuffer: boolean;\n}\n\nexport interface ISupportDict\n{\n uint32Indices: boolean;\n}\n\n/**\n * System plugin to the renderer to manage the context.\n * @memberof PIXI\n */\nexport class ContextSystem implements ISystem<ContextSystemOptions>\n{\n /** @ignore */\n static defaultOptions: ContextSystemOptions = {\n /**\n * {@link PIXI.IRendererOptions.context}\n * @default null\n * @memberof PIXI.settings.RENDER_OPTIONS\n */\n context: null,\n /**\n * {@link PIXI.IRendererOptions.antialias}\n * @default false\n * @memberof PIXI.settings.RENDER_OPTIONS\n */\n antialias: false,\n /**\n * {@link PIXI.IRendererOptions.premultipliedAlpha}\n * @default true\n * @memberof PIXI.settings.RENDER_OPTIONS\n */\n premultipliedAlpha: true,\n /**\n * {@link PIXI.IRendererOptions.preserveDrawingBuffer}\n * @default false\n * @memberof PIXI.settings.RENDER_OPTIONS\n */\n preserveDrawingBuffer: false,\n /**\n * {@link PIXI.IRendererOptions.powerPreference}\n * @default default\n * @memberof PIXI.settings.RENDER_OPTIONS\n */\n powerPreference: 'default',\n };\n /** @ignore */\n static extension: ExtensionMetadata = {\n type: ExtensionType.RendererSystem,\n name: 'context',\n };\n\n /**\n * Either 1 or 2 to reflect the WebGL version being used.\n * @readonly\n */\n public webGLVersion: number;\n\n /**\n * Features supported by current context.\n * @type {object}\n * @readonly\n * @property {boolean} uint32Indices - Support for 32-bit indices buffer.\n */\n readonly supports: ISupportDict;\n\n preserveDrawingBuffer: boolean;\n powerPreference: WebGLPowerPreference;\n\n /**\n * Pass-thru setting for the canvas' context `alpha` property. This is typically\n * not something you need to fiddle with. If you want transparency, use `backgroundAlpha`.\n * @member {boolean}\n * @deprecated since 7.0.0\n */\n useContextAlpha: boolean | 'notMultiplied';\n\n protected CONTEXT_UID: number;\n protected gl: IRenderingContext;\n\n /**\n * Extensions available.\n * @type {object}\n * @readonly\n * @property {WEBGL_draw_buffers} drawBuffers - WebGL v1 extension\n * @property {WEBGL_depth_texture} depthTexture - WebGL v1 extension\n * @property {OES_texture_float} floatTexture - WebGL v1 extension\n * @property {WEBGL_lose_context} loseContext - WebGL v1 extension\n * @property {OES_vertex_array_object} vertexArrayObject - WebGL v1 extension\n * @property {EXT_texture_filter_anisotropic} anisotropicFiltering - WebGL v1 and v2 extension\n */\n public extensions: WebGLExtensions;\n\n private renderer: Renderer;\n\n /** @param renderer - The renderer this System works for. */\n constructor(renderer: Renderer)\n {\n this.renderer = renderer;\n\n this.webGLVersion = 1;\n this.extensions = {};\n\n this.supports = {\n uint32Indices: false,\n };\n\n // Bind functions\n this.handleContextLost = this.handleContextLost.bind(this);\n this.handleContextRestored = this.handleContextRestored.bind(this);\n }\n\n /**\n * `true` if the context is lost\n * @readonly\n */\n get isLost(): boolean\n {\n return (!this.gl || this.gl.isContextLost());\n }\n\n /**\n * Handles the context change event.\n * @param {WebGLRenderingContext} gl - New WebGL context.\n */\n protected contextChange(gl: IRenderingContext): void\n {\n this.gl = gl;\n this.renderer.gl = gl;\n this.renderer.CONTEXT_UID = CONTEXT_UID_COUNTER++;\n }\n\n init(options: ContextSystemOptions): void\n {\n /*\n * The options passed in to create a new WebGL context.\n */\n if (options.context)\n {\n this.initFromContext(options.context);\n }\n else\n {\n const alpha = this.renderer.background.alpha < 1;\n const premultipliedAlpha = options.premultipliedAlpha;\n\n this.preserveDrawingBuffer = options.preserveDrawingBuffer;\n this.useContextAlpha = options.useContextAlpha;\n this.powerPreference = options.powerPreference;\n\n this.initFromOptions({\n alpha,\n premultipliedAlpha,\n antialias: options.antialias,\n stencil: true,\n preserveDrawingBuffer: options.preserveDrawingBuffer,\n powerPreference: options.powerPreference,\n });\n }\n }\n\n /**\n * Initializes the context.\n * @protected\n * @param {WebGLRenderingContext} gl - WebGL context\n */\n initFromContext(gl: IRenderingContext): void\n {\n this.gl = gl;\n this.validateContext(gl);\n this.renderer.gl = gl;\n this.renderer.CONTEXT_UID = CONTEXT_UID_COUNTER++;\n this.renderer.runners.contextChange.emit(gl);\n\n const view = this.renderer.view;\n\n if (view.addEventListener !== undefined)\n {\n view.addEventListener('webglcontextlost', this.handleContextLost, false);\n view.addEventListener('webglcontextrestored', this.handleContextRestored, false);\n }\n }\n\n /**\n * Initialize from context options\n * @protected\n * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext\n * @param {object} options - context attributes\n */\n initFromOptions(options: WebGLContextAttributes): void\n {\n const gl = this.createContext(this.renderer.view, options);\n\n this.initFromContext(gl);\n }\n\n /**\n * Helper class to create a WebGL Context\n * @param canvas - the canvas element that we will get the context from\n * @param options - An options object that gets passed in to the canvas element containing the\n * context attributes\n * @see https://developer.mozilla.org/en/docs/Web/API/HTMLCanvasElement/getContext\n * @returns {WebGLRenderingContext} the WebGL context\n */\n createContext(canvas: ICanvas, options: WebGLContextAttributes): IRenderingContext\n {\n let gl;\n\n if (settings.PREFER_ENV >= ENV.WEBGL2)\n {\n gl = canvas.getContext('webgl2', options);\n }\n\n if (gl)\n {\n this.webGLVersion = 2;\n }\n else\n {\n this.webGLVersion = 1;\n\n gl = canvas.getContext('webgl', options) || canvas.getContext('experimental-webgl', options);\n\n if (!gl)\n {\n // fail, not able to get a context\n throw new Error('This browser does not support WebGL. 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