import ShaderDestination from "../../Renderer/ShaderDestination.js";
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import LightingStageFS from "../../Shaders/ModelExperimental/LightingStageFS.js";
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import LightingModel from "./LightingModel.js";
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/**
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* The lighting pipeline stage is responsible for taking a material and rendering
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* it with a lighting model such as physically based rendering (PBR) or unlit
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* shading
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*
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* @namespace LightingPipelineStage
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*
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* @private
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*/
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var LightingPipelineStage = {};
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LightingPipelineStage.name = "LightingPipelineStage"; // Helps with debugging
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/**
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* Process a primitive. This modifies the following parts of the render
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* resources:
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* <ul>
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* <li>modifies the shader to include the lighting stage</li>
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* </ul>
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* @param {PrimitiveRenderResources} renderResources The render resources for the primitive
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* @param {ModelComponents.Primitive} primitive The primitive to be rendered
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*
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* @private
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*/
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LightingPipelineStage.process = function (renderResources, primitive) {
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var lightingOptions = renderResources.lightingOptions;
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var shaderBuilder = renderResources.shaderBuilder;
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// The lighting model is always set by the material. However, custom shaders
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// can override this.
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var lightingModel = lightingOptions.lightingModel;
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if (lightingModel === LightingModel.PBR) {
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shaderBuilder.addDefine(
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"LIGHTING_PBR",
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undefined,
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ShaderDestination.FRAGMENT
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);
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} else {
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shaderBuilder.addDefine(
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"LIGHTING_UNLIT",
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undefined,
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ShaderDestination.FRAGMENT
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);
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}
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shaderBuilder.addFragmentLines([LightingStageFS]);
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};
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export default LightingPipelineStage;
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