ps_2_0
// postprocess shadow cast render results:
//   if rendered distance is greater than light source distance - outputs infinite distance
//   tex0 - ss_res
//   tex1.w - light soruce dist (ssraydir)
//  rt should be ss_res
dcl t0
dcl_2d s0
dcl_2d s1
def c0,1,0,0,0
texld r0,t0,s0
texld r1,t0,s1
sub r1.w,r0.g,r1.w
cmp r0.g,r1.w,c0.x,r0.g
mov oC0,r0
