glFogCoord — set the current fog coordinates
Specifies a pointer to an array containing a single value representing the fog distance.
glFogCoord specifies the fog coordinate that is associated with each vertex and
the current raster position. The value specified is interpolated and used
in computing the fog color (see glFog).
glFogCoord is available only if the GL version is 1.4 or greater.
glGet with argument
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