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README: add notes about the OpenGL requirements

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This commit creates a "System Requirements" section
in the README. Thus far this wasn't required but the
Google maps plugin introduced a complication.

The next patch will attempt to add the automatic
"fall back to a software renderer".

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2017-10-29 17:58:19 +02:00 committed by Dirk Hohndel
parent 43b1a73022
commit fd2e4803a0
1 changed files with 13 additions and 0 deletions
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README
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@ -39,6 +39,19 @@ http://subsurface-divelog.org/downloads/Subsurface-4.7.0.tgz
Detailed build instructions can be found in the INSTALL file.
System Requirements:
====================
On desktop, the integrated Googlemaps feature of Subsurface requires a GPU
driver that has support for at least OpenGL 2.1. If your driver does not
support that, you may have to run Subsurface in software renderer mode.
Subsurface will automatically attempt to detect this scenario, but in case
in doesn't you may have to enable the software renderer manually with
the following:
1) Learn how to set persistent environment variables on your OS
2) Set the environment variable 'QT_QUICK_BACKEND' with the value of 'software'
Basic Usage:
============