mirror of https://github.com/nigels-com/glew.git
78 lines
3.5 KiB
Plaintext
78 lines
3.5 KiB
Plaintext
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Readme for wglinfo
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------------------
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Copyright (C) Nate Robins, 1997
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Michael Wimmer, 1999
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Milan Ikits, 2003
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wglinfo is a small utility that displays all available visuals,
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aka. pixelformats, in an OpenGL system along with renderer version
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information. It shows a table of all the visuals that support OpenGL
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and their capabilities. The format of the table is similar to glxinfo
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on Unix systems:
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visual ~= pixel format descriptor
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id = visual id (integer from 1 - max visuals)
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dep = cColorBits - color depth
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tp = dwFlags - visual type (wn: window, pb: pbuffer, bm: bitmap)
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xsp = no analog - transparent pixel (currently always ".")
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bfsz = cColorBits - framebuffer size
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lvl = bReserved - overlay (>0), underlay (<0), main plane (0)
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rgci = iPixelType - rb = rgba mode, ci = color index mode
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db = dwFlags & PFD_DOUBLEBUFFER - double buffer flag (y = yes)
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stro = dwFlags & PFD_STEREO - stereo flag (y = yes)
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gene = dwFlags & PFD_GENERIC - software generic (y = yes) or ICD
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geac = dwFlags & PFD_GENERIC_ACCELERATED - generic with hardware (MCD)
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rsz = cRedBits - # bits of red
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gsz = cGreenBits - # bits of green
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bsz = cBlueBits - # bits of blue
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asz = cAlphaBits - # bits of alpha
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axbf = cAuxBuffers - # of aux buffers
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dpth = cDepthBits - # bits of depth
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stcl = cStencilBits - # bits of stencil
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accum sz = cAccumBits - total # of bits in accumulation buffer
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accum r = cAccumRedBits - # bits of red in accumulation buffer
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accum g = cAccumGreenBits - # bits of green in accumulation buffer
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accum b = cAccumBlueBits - # bits of blue in accumulation buffer
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accum a = cAccumAlphaBits - # bits of alpha in accumulation buffer
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ms ns/b = no analog - multisample buffers (currently always ".")
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In the 10th column, you will find two additional columns:
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ge ge
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ne ac
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Those capture the PFD_GENERIC_FORMAT (gene) and
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PFD_GENERIC_ACCELERATED (geac) flags of the Pixelformat descriptor. If
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'gene' is set to no, there is most probably an ICD (Installable Client
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Driver) at work, i.e., a full OpenGL implementation by a hardware
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vendor. If 'gene' is set to yes and 'geac' to no, then the MS/SGI
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(whichever is reported) software implementation is at work. If 'gene'
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and 'geac' both are set to yes, then the generic implementation is
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supplemented by hardware acceleration, which should most certainly
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mean that an MCD (Mini Client Driver) is at work, i.e., a small driver
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that only exposes the rasterization interface of the underlying
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hardware.
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For additional details on what these flags mean, please refer to the
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included source code. The original source code can be found in the
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SGI OpenGL Windows SDK.
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For usage information, type 'wglinfo -h'
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The '-w' switch will case the program to list all pixelformats that
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can be used for hardware accelerated rendering. Hence, all pixelformats
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that can only render to bitmaps are omitted, making the output slightly more
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readable.
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The '-d' switch works around problems with some implementations where it is
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not possible to create an OpenGL context without special preparations (fullscreen
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mode or others). It forces wglinfo to only print pixelformat information, but
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no renderer information, which would require a context to be created.
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This switch shouldn't be necessary for any current OpenGL driver.
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The '-v' switch lists the pixelformats in a verbose form.
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The '-s' sends the output to stdout instead of wglinfo.txt.
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