pixi.js/lib/rendering/renderers/gl/buffer/GlBufferSystem.mjs.map

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{"version":3,"file":"GlBufferSystem.mjs","sources":["../../../../../src/rendering/renderers/gl/buffer/GlBufferSystem.ts"],"sourcesContent":["import { ExtensionType } from '../../../../extensions/Extensions';\nimport { BufferUsage } from '../../shared/buffer/const';\nimport { BUFFER_TYPE } from './const';\nimport { GlBuffer } from './GlBuffer';\n\nimport type { Buffer } from '../../shared/buffer/Buffer';\nimport type { System } from '../../shared/system/System';\nimport type { GlRenderingContext } from '../context/GlRenderingContext';\nimport type { WebGLRenderer } from '../WebGLRenderer';\n\n/**\n * System plugin to the renderer to manage buffers.\n *\n * WebGL uses Buffers as a way to store objects to the GPU.\n * This system makes working with them a lot easier.\n *\n * Buffers are used in three main places in WebGL\n * - geometry information\n * - Uniform information (via uniform buffer objects - a WebGL 2 only feature)\n * - Transform feedback information. (WebGL 2 only feature)\n *\n * This system will handle the binding of buffers to the GPU as well as uploading\n * them. With this system, you never need to work directly with GPU buffers, but instead work with\n * the Buffer class.\n * @class\n * @category rendering\n * @advanced\n */\nexport class GlBufferSystem implements System\n{\n    /** @ignore */\n    public static extension = {\n        type: [\n            ExtensionType.WebGLSystem,\n        ],\n        name: 'buffer',\n    } as const;\n\n    private _gl: GlRenderingContext;\n    private _gpuBuffers: {[key: number]: GlBuffer} = Object.create(null);\n\n    /** Cache keeping track of the base bound buffer bases */\n    private _boundBufferBases: {[key: number]: GlBuffer} = Object.create(null);\n\n    private _renderer: WebGLRenderer;\n\n    private _minBaseLocation = 0;\n    private _maxBindings: number;\n    private _nextBindBaseIndex = this._minBaseLocation;\n    private _bindCallId = 0;\n\n    /**\n     * @param {Renderer} renderer - The renderer this System works for.\n     */\n    constructor(renderer: WebGLRenderer)\n    {\n        this._renderer = renderer;\n\n        this._renderer.renderableGC.addManagedHash(this, '_gpuBuffers');\n    }\n\n    /** @ignore */\n    public destroy(): void\n    {\n        this._renderer = null;\n        this._gl = null;\n        this._gpuBuffers = null;\n        (this._boundBufferBases as null) = null;\n    }\n\n    /** Sets up the renderer context and necessary buffers. */\n    protected contextChange(): void\n    {\n        this._gl = this._renderer.gl;\n\n        this._gpuBuffers = Object.create(null);\n        this._maxBindings = this._renderer.limits.maxUniformBindings;\n    }\n\n    public getGlBuffer(buffer: Buffer): GlBuffer\n    {\n        return this._gpuBuffers[buffer.uid] || this.createGLBuffer(buffer);\n    }\n\n    /**\n     * This binds specified buffer. On first run, it will create the webGL buffers for the context too\n     * @param buffer - the buffer to bind to the renderer\n     */\n    public bind(buffer: Buffer): void\n    {\n        const { _gl: gl } = this;\n\n        const glBuffer = this.getGlBuffer(buffer);\n\n        gl.bindBuffer(glBuffer.type, glBuffer.buffer);\n    }\n\n    /**\n     * Binds an uniform buffer to at the given index.\n     *\n     * A cache is used so a buffer will not be bound again if already bound.\n     * @param glBuffer - the buffer to bind\n     * @param index - the base index to bind it to.\n     */\n    public bindBufferBase(glBuffer: GlBuffer, index: number): void\n    {\n        const { _gl: gl } = this;\n\n        if (this._boundBufferBases[index] !== glBuffer)\n        {\n            this._boundBufferBases[index] = glBuffer;\n            glBuffer._lastBindBaseLocation = index;\n\n            gl.bindBufferBase(gl.UNIFORM_BUFFER, index, glBuffer.buffer);\n        }\n    }\n\n    public nextBindBase(hasTransformFeedback: boolean)\n    {\n        this._bindCallId++;\n        this._minBaseLocation = 0;\n        if (hasTransformFeedback)\n        {\n            this._boundBufferBases[0] = null;\n            this._minBaseLocation = 1;\n            if (this._nextBindBaseIndex < 1)\n            {\n                this._nextBindBaseIndex = 1;\n            }\n        }\n    }\n\n    public freeLocationForBufferBase(glBuffer: GlBuffer): number\n    {\n        let freeIndex = this.getLastBindBaseLocation(glBuffer);\n\n        // check if it is already bound..\n        if (freeIndex >= this._minBaseLocation)\n        {\n            glBuffer._lastBindCallId = this._bindCallId;\n\n            return freeIndex;\n        }\n\n        let loop = 0;\n        let nextIndex = this._nextBindBaseIndex;\n\n        while (loop < 2)\n        {\n            if (nextIndex >= this._maxBindings)\n            {\n                nextIndex = this._minBaseLocation;\n                loop++;\n            }\n\n            const curBuf = this._boundBufferBases[nextIndex];\n\n            if (curBuf && curBuf._lastBindCallId === this._bindCallId)\n            {\n                nextIndex++;\n                continue;\n            }\n            break;\n        }\n\n        freeIndex = nextIndex;\n        this._nextBindBaseIndex = nextIndex + 1;\n\n        if (loop >= 2)\n        {\n            // TODO: error\n            return -1;\n        }\n\n        glBuffer._lastBindCallId = this._bindCallId;\n        this._boundBufferBases[freeIndex] = null;\n\n        return freeIndex;\n    }\n\n    public getLastBindBaseLocation(glBuffer: GlBuffer): number\n    {\n        const index = glBuffer._lastBindBaseLocation;\n\n        if (this._boundBufferBases[index] === glBuffer)\n        {\n            return index;\n        }\n\n        return -1;\n    }\n\n    /**\n     * Binds a buffer whilst also binding its range.\n     * This will make the buffer start from the offset supplied rather than 0 when it is read.\n     * @param glBuffer - the buffer to bind\n     * @param index - the base index to bind at, defaults to 0\n     * @param offset - the offset to bind at (this is blocks of 256). 0 = 0, 1 = 256, 2 = 512 etc\n     * @param size - the size to bind at (this is blocks of 256).\n     */\n    public bindBufferRange(glBuffer: GlBuffer, index?: number, offset?: number, size?: number): void\n    {\n        const { _gl: gl } = this;\n\n        offset ||= 0;\n        index ||= 0;\n\n        this._boundBufferBases[index] = null;\n\n        gl.bindBufferRange(gl.UNIFORM_BUFFER, index || 0, glBuffer.buffer, offset * 256, size || 256);\n    }\n\n    /**\n     * Will ensure the data in the buffer is uploaded to the GPU.\n     * @param {Buffer} buffer - the buffer to update\n     */\n    public updateBuffer(buffer: Buffer): GlBuffer\n    {\n        const { _gl: gl } = this;\n\n        const glBuffer = this.getGlBuffer(buffer);\n\n        if (buffer._updateID === glBuffer.updateID)\n        {\n            return glBuffer;\n        }\n\n        glBuffer.updateID = buffer._updateID;\n\n        gl.bindBuffer(glBuffer.type, glBuffer.buffer);\n\n        const data = buffer.data;\n\n        const drawType = (buffer.descriptor.usage & BufferUsage.STATIC) ? gl.STATIC_DRAW : gl.DYNAMIC_DRAW;\n\n        if (data)\n        {\n            if (glBuffer.byteLength >= data.byteLength)\n            {\n                // assuming our buffers are aligned to 4 bits...\n                // offset is always zero for now!\n                gl.bufferSubData(glBuffer.type, 0, data, 0, buffer._updateSize / data.BYTES_PER_ELEMENT);\n            }\n            else\n            {\n                glBuffer.byteLength = data.byteLength;\n                // assuming our buffers are aligned to 4 bits...\n                gl.bufferData(glBuffer.type, data, drawType);\n            }\n        }\n        else\n        {\n            glBuffer.byteLength = buffer.descriptor.size;\n            gl.bufferData(glBuffer.type, glBuffer.byteLength, drawType);\n        }\n\n        return glBuffer;\n    }\n\n    /** dispose all WebGL resources of all managed buffers */\n    public destroyAll(): void\n    {\n        const gl = this._gl;\n\n        for (const id in this._gpuBuffers)\n        {\n            gl.deleteBuffer(this._gpuBuffers[id].buffer);\n        }\n\n        this._gpuBuffers = Object.create(null);\n    }\n\n    /**\n     * Disposes buffer\n     * @param {Buffer} buffer - buffer with data\n     * @param {boolean} [contextLost=false] - If context was lost, we suppress deleteVertexArray\n     */\n    protected onBufferDestroy(buffer: Buffer, contextLost?: boolean): void\n    {\n        const glBuffer = this._gpuBuffers[buffer.uid];\n\n        const gl = this._gl;\n\n        if (!contextLost)\n        {\n            gl.deleteBuffer(glBuffer.buffer);\n        }\n\n        this._gpuBuffers[buffer.uid] = null;\n    }\n\n    /**\n     * creates and attaches a GLBuffer object tied to the current context.\n     * @param buffer\n     * @protected\n     */\n    protected createGLBuffer(buffer: Buffer): GlBuffer\n    {\n        const { _gl: gl } = this;\n\n        let type = BUFFER_TYPE.ARRAY_BUFFER;\n\n        if ((buffer.descriptor.usage & BufferUsage.INDEX))\n        {\n            type = BUFFER_TYPE.ELEMENT_ARRAY_BUFFER;\n        }\n        else if ((buffer.descriptor.usage & BufferUsage.UNIFORM))\n        {\n            type = BUFFER_TYPE.UNIFORM_BUFFER;\n        }\n\n        const glBuffer = new GlBuffer(gl.createBuffer(), type);\n\n        this._gpuBuffers[buffer.uid] = glBuffer;\n\n        buffer.on('destroy', this.onBufferDestroy, this);\n\n        return glBuffer;\n    }\n\n    public resetState(): void\n    {\n        this._boundBufferBases = Object.create(null);\n    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