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Static Sub Indexi ( Index As Integer )
Set the current color index.
Specifies the new value for the current color index.
Specifies a pointer to a one-element array that contains
the new value for the current color index.
updates the current (single-valued) color index.
It takes one argument, the new value for the current color index.
The current index is stored as a floating-point value.
values are converted directly to floating-point values,
with no special mapping.
The initial value is 1.
values outside the representable range of the color index buffer
are not clamped.
before an index is dithered (if enabled) and written to the frame buffer,
it is converted to fixed-point format.
Any bits in the integer portion of the resulting fixed-point value
that do not correspond to bits in the frame buffer are masked out.
are available only if the GL version is
1.1 or greater.
The current index can be updated at any time.
can be called between a call to Gl.Begin and the corresponding
call to Gl.End.
with argument Gl.CURRENT_INDEX
See original documentation on OpenGL website