HaxePunk custom vertex attrib test

import haxepunk.Scene;

import haxepunk.graphics.Image;
import haxepunk.graphics.shader.TextureShader;

class MainScene extends Scene
{
    static var vertexShader =
"#ifdef GL_ES
precision mediump float;
#endif

attribute vec4 aPosition;
attribute vec2 aTexCoord;
attribute vec4 aColor;
attribute float aColorMult;
varying vec2 vTexCoord;
varying vec4 vColor;
uniform mat4 uMatrix;

void main(void) {
    vColor = vec4(aColor.bgr * aColor.a, aColor.a) * aColorMult;
    vTexCoord = aTexCoord;
    gl_Position = uMatrix * aPosition;
}";

    override public function begin()
    {
        // Insert your scene code here...
        var img = Image.createRect(100, 100, 0x8888ff);
        img.shader = new TextureShader(vertexShader);
        img.shader.log = true;
        img.shader.setVertexAttribData("aColorMult", [ 1.0, 0.5, 0.5, 0.5, 0.5, 1.0 ], 1);
        addGraphic(img);
    }
}