// operation.
// These are calculated in the host code to save some arithmetic.
-uniform vec3 PREFIX(gain_pow_inv_gamma), PREFIX(inv_gamma_22);
+uniform vec3 PREFIX(gain_pow_inv_gamma); // gain^(1/gamma).
+uniform vec3 PREFIX(inv_gamma_22); // 2.2 / gamma.
vec4 FUNCNAME(vec2 tc) {
vec4 x = LAST_INPUT(tc);