AlphaTest for openGL ES2

gistfile1.txt

alphatest.frag
=======
precision highp float;

uniform sampler2D tex0;
uniform float alpha;
varying vec2 texCoordVarying;

void main()
{
    vec4 texel0 = texture2D(tex0, texCoordVarying);
    if(texel0.a > 0.1){
        gl_FragColor = vec4(texel0.rgb, alpha);
    }else{
        discard;
    }
}


alphatest.vert
=======

uniform mat4 modelViewProjectionMatrix;

attribute vec4 position;
attribute vec2 texcoord;

varying vec2 texCoordVarying;

void main()
{
    texCoordVarying = texcoord;
	gl_Position = modelViewProjectionMatrix * position;
}