MacOS crash with Error compiling shader: Vertex shader

[habdankm]

Hi Christian,

In current version of a game on macOS Catalina 10.15.7 (19H1715), NVIDIA GeForce GT 650M 1 GB, I'm not able to run game. It crash with this exception:
`Exception in thread "main" java.lang.IllegalArgumentException: Error compiling shader: Vertex shader
ERROR: 0:1: '' : #version required and missing.
ERROR: 0:1: 'attribute' : syntax error: syntax error
Fragment shader:
ERROR: 0:1: '' : #version required and missing.
ERROR: 0:7: 'varying' : syntax error: syntax error

    at com.badlogic.gdx.graphics.g2d.SpriteBatch.createDefaultShader(SpriteBatch.java:163)
    at com.badlogic.gdx.graphics.g2d.SpriteBatch.<init>(SpriteBatch.java:126)
    at com.badlogic.gdx.graphics.g2d.SpriteBatch.<init>(SpriteBatch.java:80)
    at mysko.pilzhere.fox3d.Foxenstein3D.create(Foxenstein3D.java:51)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.initializeListener(Lwjgl3Window.java:433)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:381)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:141)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:117)
    at mysko.pilzhere.fox3d.desktop.DesktopLauncher.main(DesktopLauncher.java:40)`

[habdankm]

Changing:
desktop/src/mysko/pilzhere/fox3d/desktop/DesktopLauncher.java
36 config.useOpenGL3(true, 3, 3); // 3.3 Works on MacOSX
to
36 config.useOpenGL3(false, 3, 2); // Note however that Mac OS X does only support 3.2
solve issue, but it's not best solution.
trying:
36 config.useOpenGL3(true, 3, 2);
give same error

[habdankm]

maybe you are willing to accept solution like this:
if (System.getProperty("os.name").contains("Mac")) { config.useOpenGL3(false, 3, 2); } else { config.useOpenGL3(true, 3, 3); }
than I can make small PR.