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// @@ V SHADER
attribute vec4 position;
attribute vec2 textureCoordinates;
uniform mat4 matrix;
varying vec2 fragmentTextureCoordinates;

void main()
{
    gl_Position = matrix * position;

    fragmentTextureCoordinates = textureCoordinates;
}

// @@ F SHADER
uniform sampler2D texture;
varying mediump vec2 fragmentTextureCoordinates;

uniform float alphaThreshold;

void main()
{
   gl_FragColor = texture2D(texture, fragmentTextureCoordinates);
   if(gl_FragColor.a<alphaThreshold)
   {
        discard;
   }
}