{"version":3,"file":"ContextSystem.mjs","sources":["../../src/context/ContextSystem.ts"],"sourcesContent":["import { ENV } from 'pixijs/constants';\nimport { extensions, ExtensionType } from 'pixijs/extensions';\nimport { settings } from 'pixijs/settings';\n\nimport type { ExtensionMetadata } from 'pixijs/extensions';\nimport type { ICanvas } from 'pixijs/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 ISupportDict\n{\n    uint32Indices: boolean;\n}\n\nexport interface ContextOptions\n{\n    context?: IRenderingContext;\n    /**\n     * Use premultipliedAlpha instead\n     * @deprecated since 7.0.0\n     */\n    useContextAlpha?: boolean | 'notMultiplied';\n    premultipliedAlpha?: boolean;\n    powerPreference?: WebGLPowerPreference;\n    preserveDrawingBuffer?: boolean;\n    antialias?: boolean;\n}\n\n/**\n * System plugin to the renderer to manage the context.\n * @memberof PIXI\n */\nexport class ContextSystem implements ISystem<ContextOptions>\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: ContextOptions): 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. Try using the canvas renderer');\n            }\n        }\n\n        this.gl = gl as IRenderingContext;\n\n        this.getExtensions();\n\n        return this.gl;\n    }\n\n    /** Auto-populate the {@link PIXI.ContextSystem.extensions extensions}. */\n    protected getExtensions(): void\n    {\n        // time to set up default extensions that Pixi uses.\n        const { gl } = this;\n\n        const common = {\n            loseContext: gl.getExtension('WEBGL_lose_context'),\n            anisotropicFiltering: gl.getExtension('EXT_texture_filter_anisotropic'),\n            floatTextureLinear: gl.getExtension('OES_texture_float_linear'),\n\n            s3tc: gl.getExtension('WEBGL_compressed_texture_s3tc'),\n            s3tc_sRGB: gl.getExtension('WEBGL_compressed_texture_s3tc_srgb'), // eslint-disable-line camelcase\n            etc: gl.getExtension('WEBGL_compressed_texture_etc'),\n            etc1: gl.getExtension('WEBGL_compressed_texture_etc1'),\n            pvrtc: gl.getExtension('WEBGL_compressed_texture_pvrtc')\n                || gl.getExtension('WEBKIT_WEBGL_compressed_texture_pvrtc'),\n            atc: gl.getExtension('WEBGL_compressed_texture_atc'),\n            astc: gl.getExtension('WEBGL_compressed_texture_astc')\n        };\n\n        if (this.webGLVersion === 1)\n        {\n            Object.assign(this.extensions, common, {\n                drawBuffers: gl.getExtension('WEBGL_draw_buffers'),\n                depthTexture: gl.getExtension('WEBGL_depth_texture'),\n                vertexArrayObject: gl.getExtension('OES_vertex_array_object')\n                    || gl.getExtension('MOZ_OES_vertex_array_object')\n                    || gl.getExtension('WEBKIT_OES_vertex_array_object'),\n                uint32ElementIndex: gl.getExtension('OES_element_index_uint'),\n                // Floats and half-floats\n                floatTexture: gl.getExtension('OES_texture_float'),\n                floatTextureLinear: gl.getExtension('OES_texture_float_linear'),\n                textureHalfFloat: gl.getExtension('OES_texture_half_float'),\n                textureHalfFloatLinear: gl.getExtension('OES_texture_half_float_linear'),\n            });\n        }\n        else if (this.webGLVersion === 2)\n        {\n            Object.assign(this.extensions, common, {\n                // Floats and half-floats\n                colorBufferFloat: gl.getExtension('EXT_color_buffer_float')\n            });\n        }\n    }\n\n    /**\n     * Handles a lost webgl context\n     * @param {WebGLContextEvent} event - The context lost event.\n     */\n    protected handleContextLost(event: WebGLContextEvent): void\n    {\n        // Prevent default to be able to restore the context\n        event.preventDefault();\n\n        // Restore the context after this event has exited\n        setTimeout(() =>\n        {\n            if (this.gl.isContextLost() && this.extensions.loseContext)\n            {\n                this.extensions.loseContext.restoreContext();\n            }\n        }, 0);\n    }\n\n    /** Handles a restored webgl context. */\n    protected handleContextRestored(): void\n    {\n        this.renderer.runners.contextChange.emit(this.gl);\n    }\n\n    destroy(): void\n    {\n        const view = this.renderer.view;\n\n        this.renderer = null;\n\n        // remove listeners\n        if (view.removeEventListener !== undefined)\n        {\n            view.removeEventListener('webglcontextlost', this.handleContextLost);\n            view.removeEventListener('webglcontextrestored', this.handleContextRestored);\n        }\n\n        this.gl.useProgram(null);\n\n        if (this.extensions.loseContext)\n        {\n            this.extensions.loseContext.loseContext();\n        }\n    }\n\n    /** Handle the post-render runner event. */\n    protected postrender(): void\n    {\n        if (this.renderer.objectRenderer.renderingToScreen)\n        {\n            this.gl.flush();\n    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