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

PIXI.shaderFragmentSrc = [
  "precision mediump float;",
  "varying vec2 vTextureCoord;",
  "varying float vColor;",
  "uniform sampler2D uSampler;",
  "void main(void) {",
    "gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.x, vTextureCoord.y));",
    "gl_FragColor = gl_FragColor * vColor;",
  "}"
];

PIXI.shaderVertexSrc = [
  "attribute vec2 aVertexPosition;",
  "attribute vec2 aTextureCoord;",
  "attribute float aColor;",
  "uniform mat4 uMVMatrix;",
  "varying vec2 vTextureCoord;",
  "varying float vColor;",
  "void main(void) {",
    "gl_Position = uMVMatrix * vec4(aVertexPosition, 1.0, 1.0);",
    "vTextureCoord = aTextureCoord;",
    "vColor = aColor;",
  "}"
];

/*
 * primitive shader..
 */


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)) {
    alert(gl.getShaderInfoLog(shader));
    return null;
  }

  return shader;
}

PIXI.activateDefaultShader = function()
{
	var gl = PIXI.gl;
	var shaderProgram = PIXI.shaderProgram;
	
	gl.useProgram(shaderProgram);
	
	gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
    gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
    gl.enableVertexAttribArray(shaderProgram.colorAttribute);
} 

PIXI.activatePrimitiveShader = function()
{
	var gl = PIXI.gl;
	
	gl.disableVertexAttribArray(PIXI.shaderProgram.textureCoordAttribute);
    gl.disableVertexAttribArray(PIXI.shaderProgram.colorAttribute);
    
	var shaderProgram2 = PIXI.shaderProgram2;
	
	gl.useProgram(shaderProgram2);
	
	gl.enableVertexAttribArray(shaderProgram2.vertexPositionAttribute);
	gl.enableVertexAttribArray(PIXI.shaderProgram2.colorAttribute);
    
}