/**
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* A utility for dynamically-generating a GLSL function
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*
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* @alias ShaderFunction
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* @constructor
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*
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* @see {@link ShaderBuilder}
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* @param {String} signature The full signature of the function as it will appear in the shader. Do not include the curly braces.
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* @example
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* // generate the following function
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* //
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* // void assignVaryings(vec3 position)
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* // {
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* // v_positionEC = (czm_modelView * vec4(a_position, 1.0)).xyz;
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* // v_texCoord = a_texCoord;
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* // }
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* var signature = "void assignVaryings(vec3 position)";
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* var func = new ShaderFunction(signature);
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* func.addLine("v_positionEC = (czm_modelView * vec4(a_position, 1.0)).xyz;");
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* func.addLine("v_texCoord = a_texCoord;");
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* var generatedLines = func.generateGlslLines();
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*
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* @private
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*/
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export default function ShaderFunction(signature) {
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this.signature = signature;
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this.body = [];
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}
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/**
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* Add a single line to the body of the function
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* @param {String} lines Line of GLSL code to add to the function body. Do not include any preceding whitespace, but do include the semicolon for each line.
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*/
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ShaderFunction.prototype.addLines = function (lines) {
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var paddedLines = lines.map(function (line) {
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return " " + line;
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});
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Array.prototype.push.apply(this.body, paddedLines);
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};
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/**
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* Generate lines of GLSL code for use with {@link ShaderBuilder}
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* @return {String[]}
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*/
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ShaderFunction.prototype.generateGlslLines = function () {
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return [].concat(this.signature, "{", this.body, "}");
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};
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