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openglglslderivative

Using lines and derivatives instructions

I'd like to know if derivatives in glsl are working on GL_LINES primitives.

AFAIK OpenGL implementations perform a discrete approximation on a group of 4 pixels (2x2 pixel quad) to compute derivative. Could it be possible to make them work on 1 pixel width lines?

Solution

  • Yes, mipmapping and derivatives work on line primitives.