//------------------------------------------------------------------------------
// zoom blit
//------------------------------------------------------------------------------
xps.1.1

// c0 = the percentage of the total effect to use.

// source textures
tex t0 // zoom result
tex t1 // zoom texture
tex t2 // zoom mask

// zoom texture is alpha-blended against blur texure
lrp r0.rgb, t1.a, t1, t0

// the destination alpha is a modulation of the zoom mask alpha and the percentage
mul r0.a, t2.b, c0.a