\(\text{bright}(x,b) = \text{clamp}(x+b,0,1)\)
Desmos
\(\begin{align} &\theta = \text{remap}(c,-1,1,0,0.5\pi)\\ &\text{contrast}(x,c) = \text{clamp}(\text{pt_angle}(x,0.5,0.5,t)) \end{align}\)
\(\text{gamma}(x,g) = x^g\)