gl_SamplePosition(3) contains the location of the current sample within the current fragment


in vec2 gl_SamplePosition ;.SH "DESCRIPTION"

gl_SamplePosition is a fragment language input variable that contains the location within a fragment of the sample currently being processed. The x and y components of gl_SamplePosition contain the sub-pixel coordinate of the current sample and will have values in the range 0.0 to 1.0. The sub-pixel coordinates of the center of the pixel are always (0.5, 0.5). Any static use of gl_SamplePosition causes the entire fragment shader to be evaluated per-sample rather than per-fragment. When rendering to a non-multisample buffer, or if multisample rasterization is disabled, gl_SamplePosition will be (0.5, 0.5).


OpenGL Shading Language Version
Function Name 1.10 1.20 1.30 1.40 1.50 3.30 4.00 4.10 4.20 4.30 4.40 4.50
gl_SamplePosition - - - - - -


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