ReadmeGL.txt Driver File Contents (V2k-3.0b5.zip)

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 
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