Minmax Conformance Test
David Yu, SGI (dyu@engr.sgi.com)

Clear the color buffer

Create a 32x32 RGBA,FLOAT test image:

     -------
    | R | B |	Not full saturated
    |	|   |	i.e. for all components c, 0 < c < 1
     -------
    | Y | C |
    |	|   |
     -------

Setup minmax for RGBA and sink == TRUE		- test sink
Enable MINMAX
DrawPixels using test image
Get minmax RGBA and reset == TRUE		- test get & result
TexImage2D using test image			- test texture w/sink
Get texture parameters to verify texture alloc
Get minmax RGB and reset == FALSE		- test get w/o reset
Get minmax A and reset == FALSE
Test that color buffer is still clear		- test sink
Setup minmax for RGBA and sink == FALSE		- test reset on redefinition
DrawPixels using test image			- test draw w/o sink
Test color buffer values
ResetMinmax					- test reset
ReadPixels					- test read pixels
Get minmax RGBA and reset == TRUE