| 1 | class AbstractMaskSystem {
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| 2 | constructor(renderer) {
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| 3 | this.renderer = renderer;
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| 4 | this.maskStack = [];
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| 5 | this.glConst = 0;
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| 6 | }
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| 7 | getStackLength() {
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| 8 | return this.maskStack.length;
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| 9 | }
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| 10 | setMaskStack(maskStack) {
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| 11 | const { gl } = this.renderer;
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| 12 | const curStackLen = this.getStackLength();
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| 13 | this.maskStack = maskStack;
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| 14 | const newStackLen = this.getStackLength();
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| 15 | if (newStackLen !== curStackLen) {
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| 16 | if (newStackLen === 0) {
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| 17 | gl.disable(this.glConst);
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| 18 | } else {
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| 19 | gl.enable(this.glConst);
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| 20 | this._useCurrent();
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| 21 | }
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| 22 | }
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| 23 | }
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| 24 | _useCurrent() {
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| 25 | }
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| 26 | destroy() {
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| 27 | this.renderer = null;
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| 28 | this.maskStack = null;
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| 29 | }
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| 30 | }
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| 31 |
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| 32 | export { AbstractMaskSystem };
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| 33 |
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