Why is Processing (0,0) in the top-left and Open GLSL in the bottom-left?

edited March 2017 in GLSL / Shaders

I've just started learning shaders and am wondering whether I should try and make my shader code somehow have the (0,0) origin in the top left if its running inside Processing?

Apparently there is a way to modify this via

layout(origin_upper_left) in vec4 gl_FragCoord;


Is this useful or needed?



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