/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

// TODO-Alvin ???
// Should we eventually create a Utils class ? 
// Or just move this file to the pixi.js file ?
PIXI.initDefaultShaders = function()
{
   
  //  PIXI.stripShader = new PIXI.StripShader();
//    PIXI.stripShader.init();

};

PIXI.CompileVertexShader = function(gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.VERTEX_SHADER);
};

PIXI.CompileFragmentShader = function(gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.FRAGMENT_SHADER);
};

PIXI._CompileShader = function(gl, shaderSrc, shaderType)
{
    var src = shaderSrc.join("\n");
    var shader = gl.createShader(shaderType);
    gl.shaderSource(shader, src);
    gl.compileShader(shader);

    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
        window.console.log(gl.getShaderInfoLog(shader));
        return null;
    }

    return shader;
};

PIXI.compileProgram = function(gl, vertexSrc, fragmentSrc)
{
    //var gl = PIXI.gl;
    var fragmentShader = PIXI.CompileFragmentShader(gl, fragmentSrc);
    var vertexShader = PIXI.CompileVertexShader(gl, vertexSrc);

    var shaderProgram = gl.createProgram();

    gl.attachShader(shaderProgram, vertexShader);
    gl.attachShader(shaderProgram, fragmentShader);
    gl.linkProgram(shaderProgram);

    if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
        window.console.log("Could not initialise shaders");
    }

    return shaderProgram;
};