@visactor/vrender-core/es/allocator/matrix-allocate.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { Matrix } from "@visactor/vutils";

import { identityMat4 } from "../common/matrix";

export const MatrixAllocate = Symbol.for("MatrixAllocate");

export const Mat4Allocate = Symbol.for("Mat4Allocate");

export function createMat4() {
    return [ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 ];
}

export class DefaultMatrixAllocate {
    constructor() {
        this.pools = [];
    }
    allocate(a, b, c, d, e, f) {
        if (!this.pools.length) return new Matrix(a, b, c, d, e, f);
        const m = this.pools.pop();
        return m.a = a, m.b = b, m.c = c, m.d = d, m.e = e, m.f = f, m;
    }
    allocateByObj(matrix) {
        if (!this.pools.length) return new Matrix(matrix.a, matrix.b, matrix.c, matrix.d, matrix.e, matrix.f);
        const m = this.pools.pop();
        return m.a = matrix.a, m.b = matrix.b, m.c = matrix.c, m.d = matrix.d, m.e = matrix.e, 
        m.f = matrix.f, m;
    }
    free(d) {
        this.pools.push(d);
    }
    get length() {
        return this.pools.length;
    }
    release(...params) {
        this.pools = [];
    }
}

export class DefaultMat4Allocate {
    constructor() {
        this.pools = [];
    }
    static identity(out) {
        return identityMat4(out);
    }
    allocate() {
        if (!this.pools.length) return createMat4();
        const m = this.pools.pop();
        return DefaultMat4Allocate.identity(m), m;
    }
    allocateByObj(d) {
        let m;
        m = this.pools.length ? this.pools.pop() : createMat4();
        for (let i = 0; i < m.length; i++) m[i] = d[i];
        return m;
    }
    free(m) {
        m && this.pools.push(m);
    }
    get length() {
        return this.pools.length;
    }
    release(...params) {
        this.pools = [];
    }
}

export const matrixAllocate = new DefaultMatrixAllocate;

export const mat4Allocate = new DefaultMat4Allocate;
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