On FreeBSD 13 with i915 (KMS) and by using x11-wm/sway as Wayland compositor, supertuxkart does not start.

supertuxkart is running fine if it is started under Xorg with an Xorg WM so I assume it is related to Wayland.

$ pkg info supertuxkart
supertuxkart-1.2
Name           : supertuxkart
Version        : 1.2
Installed on   : Thu Apr 15 11:45:31 2021 CEST
Origin         : games/supertuxkart
Architecture   : FreeBSD:13:amd64
Prefix         : /usr/local
Categories     : games
Licenses       : GPLv3+
Maintainer     : amdmi3@FreeBSD.org
WWW            : http://supertuxkart.sourceforge.net/
Comment        : Free 3D kart racing game
Options        :
        NETTLE         : on
        SERVER_ONLY    : off
Shared Libs required:
        libnettle.so.8
        libogg.so.0
        libGLU.so.1
        libGL.so.1
        libX11.so.6
        libjpeg.so.8
        libharfbuzz.so.0
        libSDL2-2.0.so.0
        libsqlite3.so.0
        libvorbisenc.so.2
        libfreetype.so.6
        libpng16.so.16
        libopenal.so.1
        libvorbis.so.0
        libGLEW.so.2
        libvorbisfile.so.3
        libcurl.so.4
Annotations    :
        FreeBSD_version: 1300139
        repo_type      : binary
        repository     : FreeBSD
Flat size      : 652MiB
Description    :
SuperTuxKart is a Free 3d kart racing game; we want to make the
game fun more than we want to make it realistic. You can play with
up to 4 friends on one PC racing against each other, or just try
to beat the computer.

See the great lighthouse or drive through the sand and visit the
pyramids. Race under water or in space, watching the stars passing
by. Have some rest under the palms on the beach (watching the other
karts overtaking you :) ). But don't fall in the volcano.

You can do a single race against other karts, compete in one of
several Grand Prix, or try to beat the high score in time trials
on your own.

WWW: http://supertuxkart.sourceforge.net/

$ supertuxkart
[verbose  ] main: Error messages and other text output will be logged to /home/stephan/.config/supertuxkart/config-0.10/stdout.log.
[info   ] [FileManager]: Data files will be fetched from: '/usr/local/share/supertuxkart/data/'
[info   ] [FileManager]: User directory is '/home/stephan/.config/supertuxkart/config-0.10/'.
[info   ] [FileManager]: Addons files will be stored in '/home/stephan/.local/share/supertuxkart/addons/'.
[info   ] [FileManager]: Screenshots will be stored in '/home/stephan/.local/share/supertuxkart/screenshots/'.
[info   ] [FileManager]: User-defined grand prix will be stored in '/home/stephan/.local/share/supertuxkart/grandprix/'.
[info   ] [FileManager]: Asset 0 will be loaded from '/usr/local/share/supertuxkart/data/challenges/'.
[info   ] [FileManager]: Asset 1 will be loaded from '/usr/local/share/supertuxkart/data/gfx/'.
[info   ] [FileManager]: Asset 2 will be loaded from '/usr/local/share/supertuxkart/data/grandprix/'.
[info   ] [FileManager]: Asset 3 will be loaded from '/usr/local/share/supertuxkart/data/gui/icons/'.
[info   ] [FileManager]: Asset 4 will be loaded from '/usr/local/share/supertuxkart/data/gui/screens/'.
[info   ] [FileManager]: Asset 5 will be loaded from '/usr/local/share/supertuxkart/data/gui/dialogs/'.
[info   ] [FileManager]: Asset 6 will be loaded from '/usr/local/share/supertuxkart/data/replay/'.
[info   ] [FileManager]: Asset 7 will be loaded from '/usr/local/share/supertuxkart/data/shaders/'.
[info   ] [FileManager]: Asset 8 will be loaded from '/usr/local/share/supertuxkart/data/skins/'.
[info   ] [FileManager]: Asset 9 will be loaded from '/usr/local/share/supertuxkart/data/ttf/'.
[info   ] [FileManager]: Asset 10 will be loaded from '/usr/local/share/supertuxkart/data/po/'.
[info   ] [FileManager]: Asset 11 will be loaded from '/usr/local/share/supertuxkart/data/library/'.
[info   ] [FileManager]: Asset 12 will be loaded from '/usr/local/share/supertuxkart/data/models/'.
[info   ] [FileManager]: Asset 13 will be loaded from '/usr/local/share/supertuxkart/data/music/'.
[info   ] [FileManager]: Asset 14 will be loaded from '/usr/local/share/supertuxkart/data/sfx/'.
[info   ] [FileManager]: Asset 15 will be loaded from '/usr/local/share/supertuxkart/data/textures/'.
[info   ] [FileManager]: Asset 16 will be loaded from '/usr/local/share/supertuxkart/data/tracks/'.
[verbose  ] translation: Env var LANGUAGE = 'de_DE.UTF-8'.
[verbose  ] translation: Language 'German (Germany)'.
[info   ] tinygettext: Adding language fallback de

..:: Antarctica Rendering Engine 2.0 ::..
[info   ] IrrDriver: OpenGL version: 4.6
[info   ] IrrDriver: OpenGL vendor: Intel
[info   ] IrrDriver: OpenGL renderer: Mesa Intel(R) Iris(R) Plus Graphics (ICL GT2)
[info   ] IrrDriver: OpenGL version string: 4.6 (Core Profile) Mesa 20.2.3
[info   ] GLEW: Glew couldn't open glx display.
[info   ] GLDriver: ARB Buffer Storage Present
[info   ] GLDriver: ARB Compute Shader Present
[info   ] GLDriver: ARB Arrays of Arrays Present
[info   ] GLDriver: ARB Texture Storage Present
[info   ] GLDriver: ARB Texture View Present
[info   ] GLDriver: ARB Image Load Store Present
[info   ] GLDriver: ARB Shader Atomic Counters Present
[info   ] GLDriver: ARB Shader Storage Buffer Object Present
[info   ] GLDriver: EXT Texture Compression S3TC Present
[info   ] GLDriver: ARB Uniform Buffer Object Present
[info   ] GLDriver: ARB Explicit Attrib Location Present
[info   ] GLDriver: EXT Texture Filter Anisotropic Present
[info   ] GLDriver: Geometry Shaders Present
[info   ] GLDriver: ARB Texture Buffer Object Present
[info   ] GLDriver: ARB Texture Swizzle Present
[info   ] GLDriver: ARB Pixel Buffer Object Present
[info   ] GLDriver: ARB Sampler Objects Present
[info   ] GLDriver: ARB Vertex Type 2_10_10_10_rev Present
[info   ] GLDriver: ARB Instanced Arrays Present
[info   ] SharedGPUObjects: Hardware Skinning enabled, method: TBO, max bones: 1024
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/screenquad.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/motion_blur.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/lightning.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/primitive2dlist.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/transparent.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/texturedquad.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/uniformcolortexturedquad.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/texturedquad.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/coloredquad.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/coloredquad.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/colortexturedquad.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/colortexturedquad.frag
[info   ] irr_driver: GLSL supported.
wl_display@1: error 0: invalid object 24
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_pass.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_solid.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_shadow.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/white.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_skinning.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_skinning_shadow.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_normal_map.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_alpha_test.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_shadow_alpha_test.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_decal.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_grass_pass.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_grass.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_grass_shadow.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_unlit.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_transparent.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_ghost.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_dynamic_night_bloom.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_tilling_mitigation.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_vertical_mapping.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_road_blending.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_displace.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/colorize.frag
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_normal_visualizer.vert
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_normal_visualizer.geom
[info   ] ShaderFilesManager: Compiling shader: /usr/local/share/supertuxkart/data/shaders/sp_normal_visualizer.frag
[info   ] HTTPRequest: Downloading https://online.supertuxkart.net/dl/xml/online_news.xml
[ALSOFT] (EE) Failed to set real-time priority for thread: Operation not permitted (1)
[info   ] GrandPrixManager: Loading Grand Prix files from /usr/local/share/supertuxkart/data/grandprix/
[info   ] GrandPrixManager: Loading Grand Prix files from /home/stephan/.local/share/supertuxkart/grandprix/
[warn   ] SPMeshBuffer: kartDirt shader is missing, fallback to solid
[warn   ] SPMeshBuffer: kartDirt shader is missing, fallback to solid
[warn   ] SPMeshBuffer: kartDirt shader is missing, fallback to solid
[warn   ] SPMeshBuffer: kartDirt shader is missing, fallback to solid
[warn   ] SPMeshBuffer: kartDirt shader is missing, fallback to solid
[info   ] addons: Downloading updated addons.xml.
[info   ] HTTPRequest: Downloading https://online.supertuxkart.net/dl/xml/online_assets.xml
[verbose  ] Thread: Start waiting 239173.731000
[error  ] addons: Error on download addons.xml: Operation was aborted by an application callback.
[verbose  ] Thread: Waited 0.032000 seconds for thread to become deleteable.
[verbose  ] Thread: Stop waiting 239173.763000
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.
[info   ] Singleton: Destroyed singleton.