@spearwolf/twopoint5d/lib/vertex-objects/VOBufferPool.js

a library to create 2.5d realtime graphics and pixelart with three.js

import { VertexObjectBuffer } from './VertexObjectBuffer.js';
import { VertexObjectDescriptor } from './VertexObjectDescriptor.js';
export class VOBufferPool {
    #usedCount = 0;
    constructor(descriptor, capacityOrData) {
        this.descriptor = descriptor instanceof VertexObjectDescriptor ? descriptor : new VertexObjectDescriptor(descriptor);
        if (typeof capacityOrData === 'number') {
            const capacity = capacityOrData;
            this.capacity = capacity;
            this.buffer = new VertexObjectBuffer(this.descriptor, capacity);
        }
        else {
            const buffersData = capacityOrData;
            this.capacity = buffersData.capacity;
            this.fromBuffersData(buffersData);
        }
    }
    get usedCount() {
        return this.#usedCount;
    }
    set usedCount(value) {
        this.#usedCount = value < this.capacity ? value : this.capacity;
    }
    get availableCount() {
        return this.capacity - this.#usedCount;
    }
    clear() {
        this.usedCount = 0;
    }
    createFromAttributes(attributes) {
        const firstObjectIndex = this.#usedCount;
        const objectCount = this.buffer.copyAttributes(attributes, firstObjectIndex);
        this.#usedCount += objectCount;
        return [objectCount, firstObjectIndex];
    }
    toBuffersData() {
        return {
            capacity: this.capacity,
            usedCount: this.usedCount,
            buffers: Object.fromEntries(Array.from(this.buffer.buffers.values()).map((buffer) => [buffer.bufferName, buffer.typedArray])),
        };
    }
    fromBuffersData(buffersData, copyTypedArrays = false) {
        if (buffersData.capacity !== this.capacity) {
            throw new Error('Invalid buffersData capacity');
        }
        this.#usedCount = buffersData.usedCount;
        if (this.buffer == null) {
            this.buffer = new VertexObjectBuffer(this.descriptor, buffersData);
        }
        else {
            for (const [bufferName, typedArray] of Object.entries(buffersData.buffers)) {
                const buffer = this.buffer.buffers.get(bufferName);
                if (buffer) {
                    if (copyTypedArrays || typedArray.length < buffer.typedArray.length) {
                        buffer.typedArray.set(typedArray);
                    }
                    else {
                        buffer.typedArray = typedArray;
                    }
                    buffer.serial++;
                }
            }
        }
    }
}
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