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system/vl.c: Expand OpenGL related errors

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Expand the OpenGL related error messages we produce for various
"OpenGL not present/not supported" cases, to hopefully guide the
user towards how to fix things.

Now if the user tries to enable GL on a backend that doesn't
support it the error message is a bit more precise:

$ qemu-system-aarch64 -M virt -device virtio-gpu-gl -display curses,gl=on
qemu-system-aarch64: OpenGL is not supported by display backend 'curses'

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[AJB: Improved error report message]
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20240731154136.3494621-3-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Peter Maydell 2024-07-31 16:41:35 +01:00 committed by Philippe Mathieu-Daudé
parent 0fa57cbfa7
commit 7aea035a60
1 changed files with 3 additions and 2 deletions
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system/vl.c
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@ -1973,9 +1973,10 @@ static void qemu_create_early_backends(void)
if (dpy.has_gl && dpy.gl != DISPLAYGL_MODE_OFF && display_opengl == 0) {
#if defined(CONFIG_OPENGL)
error_report("OpenGL is not supported by the display");
error_report("OpenGL is not supported by display backend '%s'",
DisplayType_str(dpy.type));
#else
error_report("OpenGL support is disabled");
error_report("OpenGL support was not enabled in this build of QEMU");
#endif
exit(1);
}