Xglinfo is a utility for displaying information about an X server supporting the OpenGL extension, especially with regards to visuals. It is used to examine the capabilities of a server, the predefined values for various parameters used in communicating between clients and the server, and the different types of screens and visuals that are available. It includes the same set of information as xdpyinfo, but is extended to display information about OpenGL visuals as well. In contrast to xdpyinfo the amount and form of information displayed is controllable by command line arguments.
The amount of information displayed is controllable by the command line switches. Many of these switches take either a '+' or a '-'. If the argument is preceded by a '+' the option is turned on. If the argument is preceded by a '-' the option is turned off.
The visual information can be printed in either 'raw' or 'cooked' form. The cooked form is the default. In the cooked form the visual information is analyzed and is presented in user friendly form. At the same time some basic error checks are performed on the combinations of visual data. The raw form just dumps the values returned for the visual.
Credit is due to Jim Fulton who wrote the original xdpyinfo while at MIT from which xglinfo is derived.
The following shows a sample produced by xglinfo when connected to display that supports an 24 plane screen. Note the error reporting for the OpenGL visuals. The inconsistent OpenGL visuals were deliberately set up to illustrate the error checking feature.
================================= Display :0.0 =================================
name of display: :0.0
version number: 11.0
vendor string: DECWINDOWS Digital Equipment Corporation DEC OSF/1 V1.2
vendor release: 1
max request size: 262140 bytes
motion buffer size: 100
bitmap: unit = 32, bit order = LSBFirst, padding = 32
image byte order: LSBFirst
keycode range: minimum 86, maximum 255
focus: PointerRoot
default screen num: 0
number of screens: 1
pixmap formats: 4 total
depth 1, bits_per_pixel 1, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 12, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
Server Extensions: 14 total
X3D-PEX, GLX, DEC-GLX, SHAPE, MIT-SHM,
Multi-Buffering, MIT-SUNDRY-NONSTANDARD,
Keyboard-Management-Extension,
Shared-Memory Transport, DEC-XTRAP, XVideo, Xie,
Adobe-DPS-Extension, DPSExtension,
GLX Extension: error base = 142, event base = 64, Version 1.0
=================================== Screen 0 ===================================
screen: 0
dimensions: 1280x1024 pixels (342x273 millimeters)
resolution: 95x95 dots per inch
depths: (3 total): 1, 8, 24
root window id: 0x2a
depth of root window: 24 planes
number colormaps: minimum 1, maximum 1
default colormap: 0x28, number colormap cells 256
preallocated pixels: black 0x0, white 0xffffff
options: backing-store YES, save-unders YES
input event mask: 0x70003c
ButtonPress ButtonRelease EnterWindow
LeaveWindow SubstructureRedirect FocusChange
PropertyChange
=================== 7 Visuals for Screen 0 (default = 0x26) ===================
StaticGray visual: ID = 0x21 (hex) 33 (decimal) screen = 0
GL NOT SUPPORTED
Core X: depth=8, colormapSize=256
GrayScale visual: ID = 0x22 (hex) 34 (decimal) screen = 0
GL NOT SUPPORTED
Core X: depth=8, colormapSize=256
StaticColor visual: ID = 0x23 (hex) 35 (decimal) screen = 0
DOUBLE buffered MONO COLOR INDEX visual with (Z Stencil)
GL Sizes: ColorIndex=8, Z=24, Stencil=8
ERROR: CI visual, but Alpha has non-zero size = 8
Core X: depth=8, colormapSize=256
PseudoColor visual: ID = 0x24 (hex) 36 (decimal) screen = 0
DOUBLE buffered MONO COLOR INDEX visual with (Z Stencil)
GL Sizes: ColorIndex=8, Z=24, Stencil=8
ERROR: CI visual, but Alpha has non-zero size = 8
Core X: depth=8, colormapSize=256
TrueColor visual: ID = 0x25 (hex) 37 (decimal) screen = 0
DOUBLE buffered MONO RGB visual with (Alpha Z Stencil Accum)
GL Sizes: RGBA=(3,3,2,8), Z=24, Stencil=8, Accum=(16,16,16,16)
Core X: depth=8, colormapSize=8 RGB: masks=(0xe0,0x1c,0x3) bits=8
TrueColor visual: ID = 0x26 (hex) 38 (decimal) screen = 0
DOUBLE buffered MONO RGB visual with (Alpha Z Stencil Accum)
GL Sizes: RGBA=(8,8,8,8), Z=24, Stencil=8, Accum=(16,16,16,16)
Core X: depth=24, colormapSize=256 RGB: masks=(0xff0000,0xff00,0xff) bits=8
DirectColor visual: ID = 0x27 (hex) 39 (decimal) screen = 0
DOUBLE buffered MONO RGB visual with (Alpha Z Stencil Accum)
GL Sizes: RGBA=(8,8,8,8), Z=24, Stencil=8, Accum=(16,16,16,16)
Core X: depth=24, colormapSize=256 RGB: masks=(0xff0000,0xff00,0xff) bits=8