"use strict";

var error = require('../utils/error');

/**
 * Represents a WebGL shader object and provides a mechanism to load shaders from HTML
 * script tags.
 */


function Shader(gl, script) {
  
  // Now figure out what type of shader script we have, based on its MIME type.
  if (script.type == "x-shader/x-fragment") {
    this.shader = gl.createShader(gl.FRAGMENT_SHADER);
  } else if (script.type == "x-shader/x-vertex") {
    this.shader = gl.createShader(gl.VERTEX_SHADER);
  } else {
    error("Unknown shader type: " + script.type);
    return;
  }
  
  // Send the source to the shader object.
  gl.shaderSource(this.shader, script.source);
  
  // Compile the shader program.
  gl.compileShader(this.shader);
  
  // See if it compiled successfully.
  if (!gl.getShaderParameter(this.shader, gl.COMPILE_STATUS)) {
    error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(this.shader));
    return;
  }
}
module.exports = Shader;