gl_SamplePosition — contains the location of the current sample within the current fragment
in vec2 gl_SamplePosition ;
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
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
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,
will be (0.5, 0.5).
|OpenGL Shading Language Version|
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