@babylonjs/core/Materials/Node/Blocks/Fragment/frontFacingBlock.js

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import { NodeMaterialBlock } from "../../nodeMaterialBlock.js";
import { NodeMaterialBlockConnectionPointTypes } from "../../Enums/nodeMaterialBlockConnectionPointTypes.js";
import { NodeMaterialBlockTargets } from "../../Enums/nodeMaterialBlockTargets.js";
import { RegisterClass } from "../../../../Misc/typeStore.js";
/**
 * Block used to test if the fragment shader is front facing
 */
export class FrontFacingBlock extends NodeMaterialBlock {
    /**
     * Creates a new FrontFacingBlock
     * @param name defines the block name
     */
    constructor(name) {
        super(name, NodeMaterialBlockTargets.Fragment);
        this.registerOutput("output", NodeMaterialBlockConnectionPointTypes.Float, NodeMaterialBlockTargets.Fragment);
    }
    /**
     * Gets the current class name
     * @returns the class name
     */
    getClassName() {
        return "FrontFacingBlock";
    }
    /**
     * Gets the output component
     */
    get output() {
        return this._outputs[0];
    }
    _buildBlock(state) {
        super._buildBlock(state);
        if (state.target === NodeMaterialBlockTargets.Vertex) {
            // eslint-disable-next-line no-throw-literal
            throw "FrontFacingBlock must only be used in a fragment shader";
        }
        const output = this._outputs[0];
        state.compilationString +=
            state._declareOutput(output) +
                ` = ${state._generateTernary("1.0", "0.0", state.shaderLanguage === 0 /* ShaderLanguage.GLSL */ ? "gl_FrontFacing" : "fragmentInputs.frontFacing")};\n`;
        return this;
    }
}
RegisterClass("BABYLON.FrontFacingBlock", FrontFacingBlock);
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