The following pixel format attributes can be requested and queried of pixel-formats. Binary attributes are represented by the presence of a symbol in an attribute sequence:
Integer attributes are represented by a tuple with a single value slot:
Examples
The following world subclass will request a double-buffered window with minimum 24-bit color and depth buffers, and will throw an error if the requirements aren't met:
double-buffered
stereo
offscreen
fullscreen
windowed
accelerated
software-rendered
backing-store
multisampled
supersampled
sample-alpha
color-float
Integer attributes are represented by a tuple with a single value slot:
color-bits
red-bits
green-bits
blue-bits
alpha-bits
accum-bits
accum-red-bits
accum-green-bits
accum-blue-bits
accum-alpha-bits
depth-bits
stencil-bits
aux-buffers
sample-buffers
samples
Examples
The following world subclass will request a double-buffered window with minimum 24-bit color and depth buffers, and will throw an error if the requirements aren't met:
USING: kernel ui.gadgets.worlds ui.pixel-formats ;
IN: ui.pixel-formats.examples
TUPLE: picky-depth-buffered-world < world ;
M: picky-depth-buffered-world world-pixel-format-attributes
drop {
double-buffered
T{ color-bits { value 24 } }
T{ depth-bits { value 24 } }
} ;
M: picky-depth-buffered-world check-world-pixel-format
nip
[ double-buffered pixel-format-attribute 0 = [ "Not double buffered!" throw ] when ]
[ color-bits pixel-format-attribute 24 < [ "Not enough color bits!" throw ] when ]
[ depth-bits pixel-format-attribute 24 < [ "Not enough depth bits!" throw ] when ]
tri ;