gl_FragCoord.xy origin?

OpenGL
1

Hi all !
A very dumb question about gl_FragCoord but I can’t find the information anywhere.

GLSL Specification says gl_FragCoord.xy holds window coordinates for each fragment, but does not precise if it is relative to viewport or not.

For example, if I set my viewport to (10,10,100,100), what would be the range of gl_FragCoord.xy ? [0…100[ or [10…110[ ?

2

It is in window coordinates not viewport coordinates so the range will be mapped from [0,0] to [windowWidth-1, windowHeight-1]

3

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