Add existing to tracked

node_modules/@cesium/engine/Source/Renderer/ShaderStruct.js

@@ -0,0 +1,55 @@
+/**
+ * A utility for dynamically-generating a GLSL struct.
+ *
+ * @alias ShaderStruct
+ * @constructor
+ *
+ * @see {@link ShaderBuilder}
+ * @param {string} name The name of the struct as it will appear in the shader.
+ * @example
+ * // Generate the struct:
+ * //
+ * // struct Attributes
+ * // {
+ * //     vec3 position;
+ * //     vec3 normal;
+ * //     vec2 texCoord;
+ * // };
+ * const struct = new ShaderStruct("Attributes");
+ * struct.addField("vec3", "position");
+ * struct.addField("vec3", "normal");
+ * struct.addField("vec2", "texCoord");
+ * const generatedLines = struct.generateGlslLines();
+ *
+ * @private
+ */
+function ShaderStruct(name) {
+  this.name = name;
+  this.fields = [];
+}
+
+/**
+ * Add a field to the struct
+ * @param {string} type The type of the struct field
+ * @param {string} identifier The identifier of the struct field
+ */
+ShaderStruct.prototype.addField = function (type, identifier) {
+  const field = `    ${type} ${identifier};`;
+  this.fields.push(field);
+};
+
+/**
+ * Generate a list of lines of GLSL code for use with {@link ShaderBuilder}
+ * @return {string[]} The generated GLSL code.
+ */
+ShaderStruct.prototype.generateGlslLines = function () {
+  let fields = this.fields;
+  if (fields.length === 0) {
+    // GLSL requires structs to have at least one field
+    fields = ["    float _empty;"];
+  }
+
+  return [].concat(`struct ${this.name}`, "{", fields, "};");
+};
+
+export default ShaderStruct;