Mobile-friendly.
At least my Nexus 6 works perfectly.
update: Those with just 1 particle run perfectly with my 6-yr old Galaxy S.
distort + dissolve with alpha ramp
The shader can be used with particle system.
Draw call = 1 ;
a few Lerp() in Vert and Frag ;
1 smoothstep() ;
1 input texcoord 3 output texcoord