Chromatic Aberration

code:ca.glsl

vec3 pcol = vec3(

texture(back,uv+length(uv*a)*aa).r,

texture(back,uv+length(uv*b)*bb).g,

texture(back,uv-length(uv*c)*cc).b

);

code:ca.glsl

ivec2 gl=vec2(gl_FragCoord.xy);

ivec2 off = ivec2(5);

vec3 pcol = vec3(

texelFetch(texPreviousFrame,gl+off,0).r,

texelFetch(texPreviousFrame,gl-off,0).g,

texelFetch(texPreviousFrame,gl-off,0).b

);