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

PIXI.WebGLShaderManager = function(gl)
{

    this.maxAttibs = 10;
    this.attribState = [];
    this.tempAttribState = [];

    for (var i = 0; i < this.maxAttibs; i++) {
        this.attribState[i] = false;
    }

    this.setContext(gl);
    // the final one is used for the rendering strips
    //this.stripShader = new PIXI.StripShader(gl);
};

PIXI.WebGLShaderManager.prototype.setContext = function(gl)
{
    this.gl = gl;
    
    // the next one is used for rendering primatives
    this.primitiveShader = new PIXI.PrimitiveShader(gl);

    // this shader is used for the default sprite rendering
    this.defaultShader = new PIXI.PixiShader(gl);

    // this shader is used for the fast sprite rendering
    this.fastShader = new PIXI.PixiFastShader(gl);

//    var shaderProgram = this.defaultShader.program;

    this.activateShader(this.defaultShader);
/*
    gl.useProgram(shaderProgram);

    gl.enableVertexAttribArray(this.defaultShader.aVertexPosition);
    gl.enableVertexAttribArray(this.defaultShader.colorAttribute);
    gl.enableVertexAttribArray(this.defaultShader.aTextureCoord);
 //   console.log(">>")
    //
 //    alert(this.defaultShader.aPositionCoord)
    gl.enableVertexAttribArray(this.defaultShader.aPositionCoord);
    gl.enableVertexAttribArray(this.defaultShader.aScale);
    gl.enableVertexAttribArray(this.defaultShader.aRotation);*/

};


PIXI.WebGLShaderManager.prototype.setAttribs = function(attribs)
{
    // reset temp state

    var i;

    for (i = 0; i < this.tempAttribState.length; i++)
    {
        this.tempAttribState[i] = false;
    }

    // set the new attribs
    for (i = 0; i < attribs.length; i++)
    {
        var attribId = attribs[i];
        this.tempAttribState[attribId] = true;
    }

    var gl = this.gl;

    for (i = 0; i < this.attribState.length; i++)
    {

        if(this.attribState[i] !== this.tempAttribState[i])
        {
            this.attribState[i] = this.tempAttribState[i];

            if(this.tempAttribState[i])
            {
                gl.enableVertexAttribArray(i);
            }
            else
            {
                gl.disableVertexAttribArray(i);
            }
        }
    }

  //  console.log(this.tempAttribState)
};

PIXI.WebGLShaderManager.prototype.activateShader = function(shader)
{
    //if(this.currentShader == shader)return;

    this.currentShader = shader;
 //  console.log(shader.program)
    this.gl.useProgram(shader.program);
    this.setAttribs(shader.attributes);

   // console.log(shader.attributes)
  
};

PIXI.WebGLShaderManager.prototype.activatePrimitiveShader = function()
{
    var gl = this.gl;

    gl.useProgram(this.primitiveShader.program);

    this.setAttribs(this.primitiveShader.attributes);
    /*
    gl.disableVertexAttribArray(this.defaultShader.aVertexPosition);
    gl.disableVertexAttribArray(this.defaultShader.colorAttribute);
    gl.disableVertexAttribArray(this.defaultShader.aTextureCoord);

    gl.enableVertexAttribArray(this.primitiveShader.aVertexPosition);
    gl.enableVertexAttribArray(this.primitiveShader.colorAttribute);*/
};

PIXI.WebGLShaderManager.prototype.deactivatePrimitiveShader = function()
{
    var gl = this.gl;

    gl.useProgram(this.defaultShader.program);

    this.setAttribs(this.defaultShader.attributes);
/*
    gl.disableVertexAttribArray(this.primitiveShader.aVertexPosition);
    gl.disableVertexAttribArray(this.primitiveShader.colorAttribute);

    gl.enableVertexAttribArray(this.defaultShader.aVertexPosition);
    gl.enableVertexAttribArray(this.defaultShader.colorAttribute);
    gl.enableVertexAttribArray(this.defaultShader.aTextureCoord);

    gl.enableVertexAttribArray(this.defaultShader.aPositionCoord);*/
};