lansd@godzilla.ele.toronto.edu (Robert Lansdale) (03/22/88)
This is directed at programmers who have done colour graphics on X11
(I guess X10 is very similar).
I have been developing a 3-d graphics package over the last several
months for a SUN 3/(50-160) with three Matrox boards hanging off it and
running X10/X11. It allows three colour modes with the Matrox:
- TRUE colour (24 bit rgb across the 3 boards)
- 256 colours from a 256 entry colourmap (3-3-2 mapping) using
one Matrox board.
- 256 levels of grey-scale using the 256 entry colourmap for
a single Matrox board.
As far as X-Windows is concerned , my X11 driver only supports
monochrome graphics currently, but has the hooks in it to allocate
individual colors (ala 'ico.c'). My question: does anyone have any
example code for X11 that will emulate the above three operational
colour modes as close as possible (for a colour SUN3/160). In particular,
some code that allocates as many entries in the hardware colurmap as
possible and fill it with some rgb colour model or some grey-scale mapping.
(I'm a little confused about creating an approximate colourmap from
a variable number of colour cells - ideally I would just like to get
256 colourmap entries and fill it with a 3-3-2 map).
(This is my first attempt at writing a proper graphics package
so please bear with me!).
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