#vertex

void main() {
    gl_TexCoord[0] = gl_MultiTexCoord0;
    gl_Position = ftransform();
}

#fragment

uniform float f;
uniform sampler2D base;
uniform sampler2D blur;

void main() {
    vec2 tc = vec2(gl_TexCoord[0]);
    gl_FragColor = texture2D(base, tc) + f * texture2D(blur, tc);
}