Rendition OpenGL ICD - Advanced Configuration
This driver supports a full OpenGL 1.1 ICD for the V2x00 generation of chips. As
this is a beta release, you should expect to find bugs (potentially serious) and
a few remaining missing features. Use this ICD at your own risk.
CONFIGURATION INSTRUCTIONS
==========================
The latest ICD uses registry entries and/or environment variables to modify
behavior. Three features that can be adjusted are:
(1) Triple buffering (when you are a full screen app, and ask for double
buffering you actually have 3 buffers allocated - 6 if stereo - in a transparent
fashion to the user). Triple buffering drastically reduces the time the graphics
chip spends waiting for the vertical sync between frames. An offshoot of this is
that it is no longer necessary to have the highest refresh rate to see maximum
performance. On the other hand we can run at the lowest comfortable refresh
rate, having the CRT controller access the framebuffer much less frequently and
thereby freeing up memory bandwidth for rendering. So setting the lowest refresh
rate gives best results when triple buffering is enabled. When it is not, then
highest refresh rate gives you the fastest results.
(2) Line doubled stereo. When viewing stereo, if the vertical resolution is
halved the eye gets fooled into believing that there is almost as much
resolution as in a non-stereo buffer with twice the vertical resolution.
Halving the vertical resolution, halves the memory/rendering bandwidths
required. So we are able to run almost as fast as the non-stereo case (not quite
true if the geometry is the bottleneck).
(3) Mipmapping. This release of the ICD supports per-polygon mipmapping.
Triple buffering is on by default. Stereo line doubling is off by default.
Mipmapping defaults to "none".
There is no need to edit your registry if you do not wish to change this default
behavior.
REGISTRY ENTRIES
================
To change these settings, use regedit to add to following to the local
machine registry under "Software\Rendition\OpenGL":
Name Type Values Default Description
------------------ ------ ------- ------- ----------------------------------
TripleBuffering DWORD 0 or 1 1 enable/disable triple buffering
MipMapMode STRING None None changes mipmapping mode
PerPolygon
StereoLineDouble DWORD 0 or 1 0 enable/disable line doubling
in stereo
TexLockedMemSize DWORD 1000000 8000000 bytes of memory to lock for texture
to 8000000 swapping
GL_EXT_vertex_array
DWORD 0 or 1 1 enable/disable GL_EXT_vertex_array
WGL_EXT_swap_control
DWORD 0 or 1 1 enable/disable WGL_EXT_swap_control
WGL_EXT_gamma_control
DWORD 0 or 1 1 enable/disable WGL_EXT_gamma_control
GL_EXT_point_parameters
DWORD 0 or 1 1 enable/disable
GL_EXT_point_parameters
GL_EXT_bgra
DWORD 0 or 1 1 enable/disable GL_EXT_bgra
GL_EXT_compile_vertex_array
DWORD 0 or 1 1 enable/disable
GL_EXT_compile_vertex_array
GL_EXT_clip_volume_hint
DWORD 0 or 1 1 enable/disable
GL_EXT_clip_volume_hint
GL_WIN_swap_hint
DWORD 0 or 1 1 enable/disable GL_WIN_swap_hint
GL_DFI_eight_bit_source_EXT
DWORD 0 or 1 1 enable/disable
GL_DFI_eight_bit_source_EXT
GL_REND_screen_coordinates
DWORD 0 or 1 1 enable/disable
GL_REND_screen_coordinates
Disable3DNow DWORD 0 or 1 0 enable/disable 3DNow support
ENVIRONMENT VARIABLES
=====================
The registry settings can be overridden with environment variables. Set
the following variables within your DOS session to override the defaults or
under Windows NT under MyComputer/Properties/Environment or under Window 9x in
your autoexec.bat
Note :
False = F = No = N = 0 :: these all mean False
True = T = Yes = Y = 1 :: these all mean True
TripleBuffering=<True or False>
MipMapMode=<None or PerPolygon>
StereoLineDouble=<True or False>
TexLockedMemSize=<1000000 to 8000000>
GL_EXT_vertex_array=<True or False>
WGL_EXT_swap_control=<True or False>
WGL_EXT_gamma_control=<True or False>
GL_EXT_point_parameters=<True or False>
GL_EXT_bgra=<True or False>
GL_EXT_compile_vertex_array=<True or False>
GL_EXT_clip_volume_hint=<True or False>
GL_WIN_swap_hint=<True or False>
GL_DFI_eight_bit_source_EXT=<True or False>
GL_REND_screen_coordinates=<True or False>
Disable3DNow=<True or False>
This is handy for writing scripts or creating icons to start apps with
your desired settings.
3DNow Support
=============
This release contains preliminary support for AMD's 3DNow technology. OpenGL
3DNow support works best with 3DNow enabled applications, and it may actually
slow down with non-3DNow applications. For more information on 3DNow enabled
products, please contact AMD at 'www.amd.com'. Also, 'www.3dnow.net' is another
web site with useful 3DNow related information.
3DNow support can be disabled with the 'Disable3DNow' registry or environment
setting. It is enabled by default.
APP NOTES
=========
Triple buffering uses 50% more frame buffer memory than double buffering. On a
4MB card, memory may be scarce in some applications. If you notice any
performance problems with triple buffering enabled, you may wish to disable it
or run at a lower resolution.
Quake 1 assumes a double-buffered screen, and when run with triple buffering may
exhibit flashing. At the console "set gl_triplebuffer 1" to fix this.
To turn on stereo in Quake 2, type "set cl_stereo 1", "set gl_ztrick 0",
followed by a "vidrestart".
With line-doubling enabled, the default console font in Quake 2 is very
difficult to read. You may wish to experiment with different fonts, or to turn
off stereo mode temporarily while working with the console.
If you experience crashes and think you may be running out of memory, try
decreasing the amount of memory locked for texture swapping. A system with 24MB
may not have enough memory left over to run many applications after the default
8MB has been locked.
Make sure that the Window's provided `OpenGL32.dll' is present in your
`windows/system' directory, and that no other OpenGL32.dll files are present in
your app's directory or anywhere they might override the default. Many badly
behaved application and driver installations can mess this up and overwrite the
default, so be sure and keep a spare copy of the Microsoft OpenGL32.dll around.
This file is included in Windows98, and Windows95 OSR2.
RELEASE NOTES
=============
This is a beta version of Rendition's OpenGL ICD. The following should be kept
in mind at all times:
(1) Performance is still being improved upon
(2) A few known bugs still exists
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.