| 1 | import { ExtensionType, extensions } from '@pixi/extensions';
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| 2 | import { settings } from '@pixi/settings';
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| 3 | import { AbstractMaskSystem } from './AbstractMaskSystem.mjs';
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| 4 |
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| 5 | class StencilSystem extends AbstractMaskSystem {
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| 6 | constructor(renderer) {
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| 7 | super(renderer);
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| 8 | this.glConst = settings.ADAPTER.getWebGLRenderingContext().STENCIL_TEST;
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| 9 | }
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| 10 | getStackLength() {
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| 11 | const maskData = this.maskStack[this.maskStack.length - 1];
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| 12 | if (maskData) {
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| 13 | return maskData._stencilCounter;
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| 14 | }
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| 15 | return 0;
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| 16 | }
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| 17 | push(maskData) {
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| 18 | const maskObject = maskData.maskObject;
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| 19 | const { gl } = this.renderer;
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| 20 | const prevMaskCount = maskData._stencilCounter;
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| 21 | if (prevMaskCount === 0) {
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| 22 | this.renderer.framebuffer.forceStencil();
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| 23 | gl.clearStencil(0);
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| 24 | gl.clear(gl.STENCIL_BUFFER_BIT);
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| 25 | gl.enable(gl.STENCIL_TEST);
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| 26 | }
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| 27 | maskData._stencilCounter++;
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| 28 | const colorMask = maskData._colorMask;
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| 29 | if (colorMask !== 0) {
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| 30 | maskData._colorMask = 0;
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| 31 | gl.colorMask(false, false, false, false);
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| 32 | }
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| 33 | gl.stencilFunc(gl.EQUAL, prevMaskCount, 4294967295);
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| 34 | gl.stencilOp(gl.KEEP, gl.KEEP, gl.INCR);
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| 35 | maskObject.renderable = true;
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| 36 | maskObject.render(this.renderer);
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| 37 | this.renderer.batch.flush();
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| 38 | maskObject.renderable = false;
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| 39 | if (colorMask !== 0) {
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| 40 | maskData._colorMask = colorMask;
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| 41 | gl.colorMask((colorMask & 1) !== 0, (colorMask & 2) !== 0, (colorMask & 4) !== 0, (colorMask & 8) !== 0);
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| 42 | }
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| 43 | this._useCurrent();
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| 44 | }
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| 45 | pop(maskObject) {
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| 46 | const gl = this.renderer.gl;
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| 47 | if (this.getStackLength() === 0) {
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| 48 | gl.disable(gl.STENCIL_TEST);
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| 49 | } else {
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| 50 | const maskData = this.maskStack.length !== 0 ? this.maskStack[this.maskStack.length - 1] : null;
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| 51 | const colorMask = maskData ? maskData._colorMask : 15;
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| 52 | if (colorMask !== 0) {
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| 53 | maskData._colorMask = 0;
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| 54 | gl.colorMask(false, false, false, false);
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| 55 | }
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| 56 | gl.stencilOp(gl.KEEP, gl.KEEP, gl.DECR);
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| 57 | maskObject.renderable = true;
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| 58 | maskObject.render(this.renderer);
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| 59 | this.renderer.batch.flush();
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| 60 | maskObject.renderable = false;
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| 61 | if (colorMask !== 0) {
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| 62 | maskData._colorMask = colorMask;
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| 63 | gl.colorMask((colorMask & 1) !== 0, (colorMask & 2) !== 0, (colorMask & 4) !== 0, (colorMask & 8) !== 0);
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| 64 | }
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| 65 | this._useCurrent();
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| 66 | }
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| 67 | }
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| 68 | _useCurrent() {
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| 69 | const gl = this.renderer.gl;
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| 70 | gl.stencilFunc(gl.EQUAL, this.getStackLength(), 4294967295);
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| 71 | gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);
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| 72 | }
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| 73 | }
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| 74 | StencilSystem.extension = {
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| 75 | type: ExtensionType.RendererSystem,
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| 76 | name: "stencil"
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| 77 | };
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| 78 | extensions.add(StencilSystem);
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| 79 |
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| 80 | export { StencilSystem };
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| 81 |
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