96 lines
2.7 KiB
JavaScript
96 lines
2.7 KiB
JavaScript
import Check from "../Core/Check.js";
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import DeveloperError from "../Core/DeveloperError.js";
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/**
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* A bit flag describing whether a variable should be added to the
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* vertex shader, the fragment shader, or both (or none).
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*
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* @enum {number}
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* @private
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*/
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const ShaderDestination = {
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NONE: 0,
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VERTEX: 1,
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FRAGMENT: 2,
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BOTH: 3,
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};
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/**
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* Check if a variable should be included in the vertex shader.
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*
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* @param {ShaderDestination} destination The ShaderDestination to check
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* @return {boolean} <code>true</code> if the variable appears in the vertex shader, or <code>false</code> otherwise
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* @private
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*/
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ShaderDestination.includesVertexShader = function (destination) {
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//>>includeStart('debug', pragmas.debug);
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Check.typeOf.number("destination", destination);
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//>>includeEnd('debug');
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return (destination & ShaderDestination.VERTEX) !== 0;
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};
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/**
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* Check if a variable should be included in the vertex shader.
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*
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* @param {ShaderDestination} destination The ShaderDestination to check
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* @return {boolean} <code>true</code> if the variable appears in the vertex shader, or <code>false</code> otherwise
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* @private
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*/
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ShaderDestination.includesFragmentShader = function (destination) {
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//>>includeStart('debug', pragmas.debug);
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Check.typeOf.number("destination", destination);
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//>>includeEnd('debug');
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//
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return (destination & ShaderDestination.FRAGMENT) !== 0;
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};
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/**
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* Compute the union of multiple ShaderDestinations (e.g., VERTEX | FRAGMENT yields BOTH)
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* @param {...ShaderDestination} destinations
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* @returns {ShaderDestination} The union of the provided destinations
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* @private
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*/
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ShaderDestination.union = function (...destinations) {
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//>>includeStart('debug', pragmas.debug);
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if (destinations.length === 0) {
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throw new DeveloperError(
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"ShaderDestination.union requires at least one destination.",
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);
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}
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//>>includeEnd('debug');
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let result = 0;
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for (let i = 0; i < destinations.length; i++) {
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result |= destinations[i];
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}
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return result;
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};
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/**
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* Compute the intersection of multiple ShaderDestinations (e.g., VERTEX & FRAGMENT yields NONE)
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* @param {...ShaderDestination} destinations
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* @returns {ShaderDestination} The intersection of the provided destinations
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* @private
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*/
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ShaderDestination.intersection = function (...destinations) {
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//>>includeStart('debug', pragmas.debug);
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if (destinations.length === 0) {
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throw new DeveloperError(
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"ShaderDestination.intersection requires at least one destination.",
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);
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}
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//>>includeEnd('debug');
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let result = destinations[0];
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for (let i = 1; i < destinations.length; i++) {
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result &= destinations[i];
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}
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return result;
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};
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Object.freeze(ShaderDestination);
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export default ShaderDestination;
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