Add GLES2 2D renderer + Linux display manager

First implementation with Linux display manager.

- Add single-threaded mode for EditorResourcePreview (needed for OpenGL).

Co-authored-by: clayjohn <claynjohn@gmail.com>
Co-authored-by: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/thirdparty/glad/LICENSE b/thirdparty/glad/LICENSE
new file mode 100644
index 0000000000..b6e2ca25b0
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+++ b/thirdparty/glad/LICENSE
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+The MIT License (MIT)
+
+Copyright (c) 2013-2018 David Herberth
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
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+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
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