Normally you should restart "darktable -d opencl" many times until the
output looks like this, no errors compiling the kernels:

...
2,535671 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_accu' (175) for device 0
2,535708 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_finish' (176) for device 0
2,535748 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_backtransform' (177) for device 0
2,535783 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_decompose' (178) for device 0
2,535820 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_synthesize' (179) for device 0
2,535858 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_reduce_first' (180) for device 0
2,535891 [opencl_create_kernel] successfully loaded kernel
`denoiseprofile_reduce_second' (181) for device 0

after that you can enable OpenCL in the settings (otherwise this is not
available)

I run Darktable on Mojave fine using opencl, even with the blackmagic eGPU.
If you cannot enable opencl in the settings, redo the "multiple runs until
all opencl kernels are compiled" stuff (can happen after darktable or macOS
upgrades).

hth
 mike

Am So., 2. Dez. 2018 um 12:19 Uhr schrieb Volker Lenhardt <
volker.lenha...@uni-due.de>:

> Am 01.12.18 um 22:59 schrieb Volker Lenhardt:
> >
> > /Applications/darktable.app/Contents/MacOS/darktable -d opencl
> >
> > There's a lot of output. OpenCL seems to be enabled. But for all the
> > rest it's too late tonight. I'll come to that the next days and will
> > report. For the time being my thanks to Archie and Ulrich. So long.
>
> First I started DL from the terminal without any option:
>
> macspinne:~ volker$ /Applications/darktable.app/Contents/MacOS/darktable
>
> The output:
>
> (process:501): GLib-GObject-CRITICAL **: 11:25:06.904: g_object_set:
> assertion 'G_IS_OBJECT (object)' failed
>
> (darktable-bin:501): GLib-GObject-WARNING **: 11:25:07.665: invalid cast
> from 'GtkMenuBar' to 'GtkWindow'
>
> (darktable-bin:501): Gtk-CRITICAL **: 11:25:07.665:
> gtk_window_add_accel_group: assertion 'GTK_IS_WINDOW (window)' failed
>
> After closing DT:
>
> (darktable-bin:501): GLib-GObject-CRITICAL **: 11:26:44.700:
> g_object_unref: assertion 'G_IS_OBJECT (object)' failed
>
> Are these errors relevant within the Apple environment?
>
> When I start DT with the "-d opencl" option these errors are still
> there. But all output concerning openCL shows no errors. If requested I
> can post the lines.
>
> Volker
>
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