Pixel-Composer/shaders/sh_blur_alpha/sh_blur_alpha.fsh

//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;

void main() {
	float alpha = texture2D( gm_BaseTexture, v_vTexcoord ).a;
    gl_FragColor = vec4(vec3(alpha), 1.);
}