pixi.js/lib/rendering/renderers/gl/GlStencilSystem.mjs.map

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{"version":3,"file":"GlStencilSystem.mjs","sources":["../../../../src/rendering/renderers/gl/GlStencilSystem.ts"],"sourcesContent":["import { ExtensionType } from '../../../extensions/Extensions';\nimport { GpuStencilModesToPixi } from '../gpu/state/GpuStencilModesToPixi';\nimport { STENCIL_MODES } from '../shared/state/const';\n\nimport type { RenderTarget } from '../shared/renderTarget/RenderTarget';\nimport type { System } from '../shared/system/System';\nimport type { WebGLRenderer } from './WebGLRenderer';\n\n/**\n * This manages the stencil buffer. Used primarily for masking\n * @category rendering\n * @advanced\n */\nexport class GlStencilSystem implements System\n{\n    /** @ignore */\n    public static extension = {\n        type: [\n            ExtensionType.WebGLSystem,\n        ],\n        name: 'stencil',\n    } as const;\n\n    private _gl: WebGLRenderingContext;\n\n    private readonly _stencilCache = {\n        enabled: false,\n        stencilReference: 0,\n        stencilMode: STENCIL_MODES.NONE,\n    };\n\n    private _renderTargetStencilState: Record<number, {\n        stencilMode: STENCIL_MODES;\n        stencilReference: number;\n    }> = Object.create(null);\n\n    private _stencilOpsMapping: {\n        keep: number;\n        zero: number;\n        replace: number;\n        invert: number;\n        'increment-clamp': number;\n        'decrement-clamp': number;\n        'increment-wrap': number;\n        'decrement-wrap': number;\n    };\n\n    private _comparisonFuncMapping: {\n        always: number;\n        never: number;\n        equal: number;\n        'not-equal': number;\n        less: number;\n        'less-equal': number;\n        greater: number;\n        'greater-equal': number;\n    };\n\n    private _activeRenderTarget: RenderTarget;\n\n    constructor(renderer: WebGLRenderer)\n    {\n        renderer.renderTarget.onRenderTargetChange.add(this);\n    }\n\n    protected contextChange(gl: WebGLRenderingContext)\n    {\n        // TODO - this could be declared in a gl const\n        // we know the numbers don't tend to change!\n        this._gl = gl;\n\n        this._comparisonFuncMapping = {\n            always: gl.ALWAYS,\n            never: gl.NEVER,\n            equal: gl.EQUAL,\n            'not-equal': gl.NOTEQUAL,\n            less: gl.LESS,\n            'less-equal': gl.LEQUAL,\n            greater: gl.GREATER,\n            'greater-equal': gl.GEQUAL,\n        };\n\n        this._stencilOpsMapping = {\n            keep: gl.KEEP,\n            zero: gl.ZERO,\n            replace: gl.REPLACE,\n            invert: gl.INVERT,\n            'increment-clamp': gl.INCR,\n            'decrement-clamp': gl.DECR,\n            'increment-wrap': gl.INCR_WRAP,\n            'decrement-wrap': gl.DECR_WRAP,\n        };\n\n        this.resetState();\n    }\n\n    protected onRenderTargetChange(renderTarget: RenderTarget)\n    {\n        if (this._activeRenderTarget === renderTarget) return;\n\n        this._activeRenderTarget = renderTarget;\n\n        let stencilState = this._renderTargetStencilState[renderTarget.uid];\n\n        if (!stencilState)\n        {\n            stencilState = this._renderTargetStencilState[renderTarget.uid] = {\n                stencilMode: STENCIL_MODES.DISABLED,\n                stencilReference: 0,\n            };\n        }\n\n        // restore the current render targets stencil state..\n        this.setStencilMode(stencilState.stencilMode, stencilState.stencilReference);\n    }\n\n    public resetState()\n    {\n        // reset stencil cache\n        this._stencilCache.enabled = false;\n        this._stencilCache.stencilMode = STENCIL_MODES.NONE;\n        this._stencilCache.stencilReference = 0;\n    }\n\n    public setStencilMode(stencilMode: STENCIL_MODES, stencilReference: number)\n    {\n        const stencilState = this._renderTargetStencilState[this._activeRenderTarget.uid];\n\n        const gl = this._gl;\n        const mode = GpuStencilModesToPixi[stencilMode];\n\n        const _stencilCache = this._stencilCache;\n\n        // store the stencil state for restoration later, if a render target changes\n        stencilState.stencilMode = stencilMode;\n        stencilState.stencilReference = stencilReference;\n\n        if (stencilMode === STENCIL_MODES.DISABLED)\n        {\n            if (this._stencilCache.enabled)\n            {\n                this._stencilCache.enabled = false;\n\n                gl.disable(gl.STENCIL_TEST);\n            }\n\n            return;\n        }\n\n        if (!this._stencilCache.enabled)\n        {\n            this._stencilCache.enabled = true;\n            gl.enable(gl.STENCIL_TEST);\n        }\n\n        if (stencilMode !== _stencilCache.stencilMode || _stencilCache.stencilReference !== stencilReference)\n        {\n            _stencilCache.stencilMode = stencilMode;\n            _stencilCache.stencilReference = stencilReference;\n\n            // this is pretty simple mapping.\n            // will work for pixi's simple mask cases.\n            // although a true mapping of the GPU state to webGL state should be done\n            gl.stencilFunc(this._comparisonFuncMapping[mode.stencilBack.compare], stencilReference, 0xFF);\n            gl.stencilOp(gl.KEEP, gl.KEEP, this._stencilOpsMapping[mode.stencilBack.passOp]);\n        }\n    }\n\n    public destroy?: () => 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