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Fix opengl initialisation on wayland #439
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opened 2026-04-05 16:20:59 +02:00 by MrUnknownDE
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Reference: github/OrcaSlicer#439
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Originally created by @bapt on 3/6/2026
glewInit() returns GLEW_ERROR_NO_GLX_DISPLAY (error code 4) when running under Wayland/EGL. GLEW successfully loads all core GL function pointers via EGL, but then fails on the GLX initialization path and reports an error. The code was treating this as a fatal error, blocking all OpenGL rendering.
As a workaround, accept GLEW_ERROR_NO_GLX_DISPLAY as a non-fatal result alongside GLEW_OK.
Description
While porting OrcaSlicer on FreeBSD (related patches to come later) I figure that what starting OrcaSlicer on wayland, the opengl was not rendered at all, This patch fixes it.
Tests
I started OrcaSlicer under sway and got the UI but couldn't preview or prepare anything as the opengl part was not initialize. After this patch, it works as expected.