getgdesc(3G) getgdesc(3G)
NAME
getgdesc - gets graphics system description
C SPECIFICATION
long getgdesc(long inquiry)
PARAMETERS
inquiry is a symbolic constant taken from the list below. It
identifies the characteristic about which you want to inquire.
FUNCTION RETURN VALUE
The function returns the value of the requested characteristic, or -1, if
the request is invalid or its value cannot be determined.
DESCRIPTION
getgdesc allows you to inquire about characteristics of the currently
selected screen. If the inquired characteristic is about bitplane
configuration, getgdesc will return a value that indicates the absolute
maximum resources available for the individual characteristic. It is not
guaranteed that the bitplane configuration will reflect these values, as
gconfig reconciles the various requests for resources. You must call
getgconfig to find out the result of the compromises made by gconfig. You
can call getgdesc prior to graphics initialization, as its return values
are unaltered by any commands issued after initialization.
The symbolic names of the inquiries and their meanings are specified
below:
Screen Boundary Inquiries
GDXMMAX
GDYMMAX
Vertical and horizontal size of the screen in millimeters.
GDXPMAX
GDYPMAX
Vertical and horizontal size of the screen in pixels.
GDZMAX
GDZMIN
Maximum and minimum depth values that can be stored in the z-buffer
of the normal framebuffer.
Framebuffer Depth Inquiries
GDBITSACBUF
Maximum number of bitplanes per color component in the hardware
accumulation buffer, if one exists. Otherwise the number of
bitplanes per color component in the software version of the
accumulation buffer, if it is implemented. Otherwise 0.
GDBITSACBUFHW
Maximum number of bitplanes per color component in the hardware
accumulation buffer, if one exists. Otherwise 0.
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GDBITSCURSOR
Number of bitplanes available in the cursor.
GDBITSNORMDBLALPHA
Maximum number of bitplanes available in the normal framebuffer to
store alpha in double buffered RGB mode.
GDBITSNORMDBLCMODE
Maximum number of bitplanes available in the normal framebuffer to
store the color index in double buffered color map mode.
GDBITSNORMDBLMMAP
Maximum number of bitplanes available in the normal framebuffer to
store the color index in double buffered multimap mode.
GDBITSNORMDBLRED
GDBITSNORMDBLGREEN
GDBITSNORMDBLBLUE
Maximum number of bitplanes available in the normal framebuffer to
store red, green, and blue in double buffered RGB mode. If any of
these are 0, then double buffered RGB mode is not available.
GDBITSNORMSNGALPHA
Maximum number of bitplanes available in the normal framebuffer to
store alpha in single buffered RGB mode.
GDBITSNORMSNGCMODE
Maximum number of bitplanes available in the normal framebuffer to
store the color index in single buffered color map mode.
GDBITSNORMSNGMMAP
Maximum number of bitplanes available in the normal framebuffer to
store the color index in single buffered multimap mode.
GDBITSNORMSNGRED
GDBITSNORMSNGGREEN
GDBITSNORMSNGBLUE
Maximum number of bitplanes available in the normal framebuffer to
store red, green, and blue in single buffered RGB mode. If any of
these are 0, then single buffered RGB mode is not available.
GDBITSNORMZBUFFER
Maximum number of useful bitplanes in the z-buffer of the normal
framebuffer, If 0, then there is no z-buffer.
GDBITSOVERSNGCMODE
Maximum number of bitplanes available in the overlay framebuffer to
store the color index in single buffered color map mode.
GDBITSPUPSNGCMODE
Maximum number of bitplanes available in the popup framebuffer to
store the color index in single buffered color map mode.
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getgdesc(3G) getgdesc(3G)
GDBITSSTENCIL
Maximum number of bitplanes available in the normal framebuffer for
use as stencil bitplanes. 0 if stencil is not functional.
GDBITSUNDRSNGCMODE
Maximum number of bitplanes available in the underlay framebuffer to
store the color index in single buffered color map mode.
Miscellaneous Inquiries
GDAFUNCTION
1 if afunction is functional, 0 if it is not.
GDAFUNCTIONMODES
1 if all afunction functions are supported, 0 if they are not.
GDALPHAOVERUNDER
1 if alpha bitplanes in the normal framebuffer can be allocated as
color map bitplanes in the overlay or underlay framebuffers, 0 if
they cannot.
GDBLEND
1 if blending is supported in all framebuffers that support RGB
mode, 0 otherwise. (See blendfunction.)
GDBLENDCOLOR
1 if blendcolor is supported in all framebuffers that support RGB
mode, 0 otherwise.
GDCIFRACT
1 if fractional interpolation of color indices is supported in all
framebuffers, 0 otherwise. (See colorf.)
GDCLIPPLANES
Number of user-defined clipping planes supported. 0 if none are
supported. (See clipplane.)
GDCROSSHAIRCINDEX
Color index whose color map entry controls the color of the cross-
hair cursor.
GDMUXPIPES
Number of other graphics pipes available to be video multiplexed
with the graphics pipe associated with the current screen.
GDDBBOX
1 if the dial and button box routines are functional, 0 if they are
not. Unlike most of the others, this inquiry is independent of the
currently selected screen. (See dbtext and setdblights.)
GDDITHER
1 if dithering is supported. 0 otherwise.
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GDFOGVERTEX
1 if fogvertex supports the per vertex fog modes, namely FGVTXEXP,
FGVTXEXP2, and FGVTXLIN. 0 if it does not.
GDFOGPIXEL
1 if fogvertex supports the per pixel fog modes, namely FGPIXEXP,
FGPIXEXP2, and FGPIXLIN. 0 if it does not.
GDISNATIVE
0 if the IrisGL implementation is layered on OpenGL.
GDFRAMEGRABBER
1 if readsource(SRCFRAMEGRABBER) is functional, 0 if it is not.
GDLIGHTINGATT2
1 if the ATTENUATION2 lighting model attribute is functional, 0 if
it is not. (See lmdef.)
GDLIGHTINGSPOTLIGHT
1 if spotlights are functional, 0 if they are not. (See lmdef.)
GDLIGHTINGTWOSIDE
1 if the TWOSIDE lighting model attribute is functional, 0 if it is
not. (See lmdef.)
GDLINESMOOTHCMODE
1 if antialiased lines are supported in the normal framebuffer in
color map mode, 0 otherwise. (See linesmooth.)
GDLINESMOOTHRGB
1 if antialiased lines are supported in RGB mode in all framebuffers
that support RGB mode, 0 otherwise. (See linesmooth.)
GDLOGICOP
1 if logical operations are supported in all framebuffers, 2 if only
in the normal framebuffer, and 0 otherwise. (See logicop.)
GDMULTISAMPLE
1 if the multisample routines are functional, 0 if they are not.
GDNBLINKS
Maximum number of blinking color map entries on the selected screen.
If the value is non-zero, it will be at least 20. (See blink.)
GDNMMAPS
Number of smaller color maps available to the user in multimap mode.
On some models, the highest-numbered color map is reserved for use
by the system. (See setmap.)
GDNSCRNS
Number of screens available on the system. Unlike most of the
others, this inquiry is independent of the currently selected
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getgdesc(3G) getgdesc(3G)
screen.
GDNURBSORDER
Maximum order of any NURBS surface, NURBS curve, and NURBS trimming
curve.
GDNVERTEXPOLY
Maximum number of vertices in a single polygon. If there is no
limit, then GDNOLIMIT is returned.
GDOVERUNDERSHARED
1 if overlay and underlay planes are shared, 0 if both can be used
simultaneously.
GDPATSIZE64
1 if 64x64 patterns are supported, 0 otherwise. (See defpattern.)
GDPNTSMOOTHCMODE
1 if antialiased points are supported in the normal framebuffer in
color map mode, 0 otherwise. (See pntsmooth.)
GDPNTSMOOTHRGB
1 if antialiased points are supported in RGB mode in all
framebuffers that support RGB mode, 0 otherwise. (See pntsmooth.)
GDPOLYMODE
1 if polymode is functional, 0 if it is not.
GDPOLYSMOOTH
1 if antialiased polygons are supported in RGB mode in all
framebuffers that support RGB mode, 0 otherwise. (See polysmooth.)
GDPUPTOOVERUNDER
1 if the popup bitplanes can be allocated as color map bitplanes in
the overlay or underlay framebuffers, 0 if they cannot.
GDREADSOURCE
1 if readsource sources SRC_AUTO, SRC_FRONT, and SRC_BACK are
functional, 0 if they are not.
GDREADSOURCEZBUFFER
1 if readsource(SRCZBUFFER) is functional, 0 if it is not.
GDSCRBOX
1 if scrbox is functional, 0 if it is not.
GDSCRNTYPE
Type of the currently selected screen. Returns GDSCRNTYPEWM if
there is window management on the screen or GDSCRNTYPENOWM if
there isn't. There can be at most one window open on screens of the
latter type.
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getgdesc(3G) getgdesc(3G)
GDSTEREO
1 if setmonitor(STRRECT) is functional, 0 if it is not.
GDSTEREOINWINDOW
1 if per-window stereo is functional, 0 if it is not. (See
stereobuffer.)
GDSUBPIXELLINE
GDSUBPIXELPNT
GDSUBPIXELPOLY
1 if subpixel positioned lines, points, and polygons (respectively)
are supported in all framebuffers, 0 otherwise. (See subpixel.)
GDTEXTPORT
1 if the textport routines are functional, 0 if they are not.
Unlike most of the others, this inquiry is independent of the
currently selected screen. (See textport.)
GDTEXTURE
1 if texture mapping routines are functional, 0 if they are not.
(See texdef2d.)
GDTEXTURE3D
1 if 3D texture mapping routines are functional, 0 if they are not.
(See texdef3d.)
GDTEXTUREDETAIL
1 if TXDETAIL is functional, 0 if it is not. (See texdef.)
GDTEXTURELUT
1 if texture lookup tables are functional, 0 if they are not. (See
tlutdef.)
GDTEXTURESHARP
1 if TXSHARPEN is functional, 0 if it is not. (See texdef.)
GDTIMERHZ
Frequency of graphics timer events.
GDTRIMCURVEORDER
Maximum order of a trimming curve.
GDWSYS
Type of window system running on the machine. Returns GDWSYS4S if
a windowing system is currently running or GDWSYSNONE if there is
no window system currently running. Unlike most of the others, this
inquiry is independent of the currently selected screen.
GDZDRAWGEOM
GDZDRAWPIXELS
1 if routines that render geometry and routines that render pixels
(respectively) will do it into the z-buffer when zdraw is TRUE, 0 if
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getgdesc(3G) getgdesc(3G)
they do not.
SEE ALSO
gversion, scrnselect
NOTES
This routine is available only in immediate mode.
To inquire about the screen on which the current window is displayed, use
the following sequence:
long savescrn;
...
savescrn = scrnselect(getwscrn());
val1 = getgdesc(inquiry1);
val2 = getgdesc(inquiry2);
...
scrnselect(savescrn);
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