Silicon Graphics IRIS Workstation, User Manual

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158 IRIS WORKSTATION GUIDE
Version 1.0
Appendix L:
L.5 Changes to existing commands
width
, in
linewidth(width)
, can be arbitrary (in GL 1 it had to be 1 or 2).
The matrix stack depth is no longer limited to 8. There is a hardware stack
limit of 8, but on overflow the extra matrices are stored in software.
Obviously, pushing and popping matrices is faster if the stack is shorter than
8.
L.6 Additional commands
blankscreen(on/off)
-- turns off the display. This is useful during massive
color map changes -- garbage does not appear on the screen.
getcpos(&ix, %iy)
-- get the current character position, and returns it in the
variables ix and iy .
getgpos(&fx, %fy, &fz)
-- get the current graphics position, and returns it in
fx , fy , and fz .
getopenobj()
-- returns the object identifier of the object currently open for
editing. If there is no open object, it returns -1.
getmcolor(color, &r, &g, &b)
-- given a colormap index, return its red, green,
and blue components.
pmov(), pmovi(), pmov2(), pmov2i()
-- polygon move. With these, you can use
your own data structures for polygons. Polygons must still be convex or the
result of drawing them is undefined.
pdrw()], pdrwi()], prw2()], pdrw2i()
-- polygon draw.
pclose()
-- polygon close.
rmov(), rmovi(), rmov2(), rmov2i()
-- relative move.
rdrw(), rdrwi(), rdrw2(), rdrw2i()
-- relative draw.
rpmv(), rpmvi(), rpmv2(), rpmv2i()
-- relative polygon move.
rpdr(), rpdri(), rpdr2(), rpdr2i()
-- relative polygon draw.
L.7 Feedback
GL 1.9 still supports the old GL 1 versions of the feedback routines. The
feedback routines. include
transform()
,
clippnt()
,
clipline()
,
clippoly()
,
and
screenpnt()
. In GL 2, these routines will be replaced by a much more
general
feedback()
command. To simplify conversion to GL 2, keep references
to the GL 1 versions of the above commands localized.