var Shader = require('../../core/Shader');

/**
 * @class
 * @extends PIXI.Shader
 * @memberof PIXI
 * @param gl {PIXI.Shader} The webgl shader manager this shader works for.
 */
function ParticleShader(gl)
{
    Shader.call(this,
        gl,
        // vertex shader
        [
            'attribute vec2 aVertexPosition;',
            'attribute vec2 aTextureCoord;',
            'attribute float aColor;',

            'attribute vec2 aPositionCoord;',
            'attribute vec2 aScale;',
            'attribute float aRotation;',

            'uniform mat3 projectionMatrix;',

            'varying vec2 vTextureCoord;',
            'varying float vColor;',

            'void main(void){',
            '   vec2 v = aVertexPosition;',

            '   v.x = (aVertexPosition.x) * cos(aRotation) - (aVertexPosition.y) * sin(aRotation);',
            '   v.y = (aVertexPosition.x) * sin(aRotation) + (aVertexPosition.y) * cos(aRotation);',
            '   v = v + aPositionCoord;',

            '   gl_Position = vec4((projectionMatrix * vec3(v, 1.0)).xy, 0.0, 1.0);',

            '   vTextureCoord = aTextureCoord;',
            '   vColor = aColor;',
            '}'
        ].join('\n'),
        // hello
         [
            'varying vec2 vTextureCoord;',
            'varying float vColor;',

            'uniform sampler2D uSampler;',
            'uniform float uAlpha;',

            'void main(void){',
            '  vec4 color = texture2D(uSampler, vTextureCoord) * vColor * uAlpha;',
            '  if (color.a == 0.0) discard;',
            '  gl_FragColor = color;',
            '}'
        ].join('\n')
    );

    // TEMP HACK

}

ParticleShader.prototype = Object.create(Shader.prototype);
ParticleShader.prototype.constructor = ParticleShader;

module.exports = ParticleShader;