Force Mesa GL to use sofware render.

- Helps on some setups (i.e. WSL2, VcXsrv).
- Usually not needed.

Closes #22

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Force Mesa GL to use sofware render. Helps on some setups. (#22)
 
 ## [1.6.12] - 2022-06-02
 ### Fixed

src/pcbnew_do

@@ -993,6 +993,8 @@ if __name__ == '__main__':
 
     # Force english + UTF-8
     os.environ['LANG'] = get_en_locale(logger)
+    # Force Mesa software rendering (otherwise, the 3D viewer may crash)
+    os.environ['LIBGL_ALWAYS_SOFTWARE'] = "1"
     # Make sure the input file exists and has an extension
     check_input_file(cfg, NO_PCB, WRONG_PCB_NAME)
     cfg.board = load_pcb(cfg.input_file)