// maxerror = 0.000094
// error at beta = 0.000012
// error at 1.0 = 0.000012
+ //
+ // Note that the worst _relative_ error by far is just at the beginning
+ // of the exponential curve, ie., just around β.
set_uniform_float(glsl_program_num, prefix, "linear_scale", 1.0 / 12.92);
set_uniform_float(glsl_program_num, prefix, "c0", 0.001324469581);
set_uniform_float(glsl_program_num, prefix, "c1", 0.02227416690);