Shader Optimization #1
Description
Currently the shader runs two 2D loops. First to find the closest edge pixel, then again to blur the image, if frost is used.
Even though frost is not a 2D loop anymore using fast box blur, it might be worth testing if we can improve the shader by combining both.
Also test worthy: we currently check all pixels for closest edge. Instead of looping from x in -radius...radius we could loop x in 0...radius, then testing -x and +x. If we find a pixel at distance X, we know that there cannot be a closer edge at X+1 and we can continue early. The question is if that will increase the shader or will it just cause that one shader pipeline to wait for the others to finish.