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

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

import { VOBufferPool } from './VOBufferPool.js';
import { VOUtils } from './VOUtils.js';
import { VertexObjectDescriptor } from './VertexObjectDescriptor.js';
import { createVertexObject } from './createVertexObject.js';
export class VertexObjectPool extends VOBufferPool {
    #voIndex;
    constructor(descriptor, capacityOrData) {
        super(descriptor, capacityOrData);
        this.#voIndex = new Array(this.capacity);
    }
    createVO() {
        if (this.usedCount < this.capacity) {
            const idx = this.usedCount++;
            const vo = this.#createVO(idx);
            this.#voIndex[idx] = vo;
            return vo;
        }
        return undefined;
    }
    containsVO(vo) {
        return VOUtils.isBuffer(vo, this.buffer);
    }
    freeVO(vo) {
        if (!this.containsVO(vo))
            return;
        const idx = VOUtils.getIndex(vo);
        const lastUsedIdx = this.usedCount - 1;
        if (idx === lastUsedIdx) {
            this.#destroyVO(idx);
        }
        else {
            this.buffer.copyWithin(idx, lastUsedIdx, lastUsedIdx + 1);
            const lastUsedVO = this.#voIndex[lastUsedIdx];
            VOUtils.setIndex(lastUsedVO, idx);
            this.#voIndex[idx] = lastUsedVO;
        }
        this.usedCount--;
        VOUtils.clearBuffer(vo);
    }
    getVO(idx) {
        let vo = this.#voIndex[idx];
        if (vo == null && idx < this.usedCount) {
            vo = this.#createVO(idx);
            this.#voIndex[idx] = vo;
        }
        return vo;
    }
    #destroyVO(idx) {
        const vo = this.#voIndex[idx];
        if (vo != null && this.onDestroyVO != null) {
            this.onDestroyVO(vo);
        }
        this.#voIndex[idx] = undefined;
    }
    #createVO(idx) {
        const vo = createVertexObject(this.descriptor, this.buffer, idx);
        this.buffer.touch();
        if (this.onCreateVO != null) {
            return this.onCreateVO(vo) ?? vo;
        }
        return vo;
    }
}
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