/**
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* A utility for dynamically-generating a GLSL struct.
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*
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* @alias ShaderStruct
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* @constructor
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*
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* @see {@link ShaderBuilder}
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* @param {String} name The name of the struct as it will appear in the shader.
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* @example
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* // Generate the struct:
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* //
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* // struct Attributes
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* // {
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* // vec3 position;
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* // vec3 normal;
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* // vec2 texCoord;
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* // };
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* var struct = new ShaderStruct("Attributes");
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* struct.addField("vec3", "position");
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* struct.addField("vec3", "normal");
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* struct.addField("vec2", "texCoord");
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* var generatedLines = struct.generateGlslLines();
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*
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* @private
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*/
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export default function ShaderStruct(name) {
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this.name = name;
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this.fields = [];
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}
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/**
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* Add a field to the struct
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* @param {String} type The type of the struct field
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* @param {String} identifier The identifier of the struct field
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*/
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ShaderStruct.prototype.addField = function (type, identifier) {
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var field = " " + type + " " + identifier + ";";
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this.fields.push(field);
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};
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/**
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* Generate a list of lines of GLSL code for use with {@link ShaderBuilder}
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* @return {String[]} The generated GLSL code.
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*/
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ShaderStruct.prototype.generateGlslLines = function () {
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var fields = this.fields;
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if (fields.length === 0) {
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// GLSL requires structs to have at least one field
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fields = [" float _empty;"];
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}
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return [].concat("struct " + this.name, "{", fields, "};");
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};
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