vec4 FUNCNAME(vec2 tc) {
vec4 x = LAST_INPUT(tc);
- const float pihalf = 3.14159265358979324 / 2;
+ const float pihalf = 0.5 * 3.14159265358979324;
vec2 normalized_pos = (tc - PREFIX(center)) * PREFIX(aspect_correction);
float dist = (length(normalized_pos) - PREFIX(inner_radius)) * PREFIX(inv_radius);