[Bug 82717] OpenCL support for mandelbulber-opencl

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82717

--- Comment #8 from Christoph Haag <haagch at frickel.club> ---
To document the current state...

Recently I was getting "unsupported call to function get_global_id" so I
assumed there was some llvm problem. Turns out if this happens you just need to
rebuild libclc for your llvm version.

With these patches mandelbulber-opencl sorta works:
https://cgit.freedesktop.org/~funfunctor/mesa/log/?h=clover-image-support-enabled

When I first tested the patches, I made this Video:
https://www.youtube.com/watch?v=-R-r0CEub74
The rendering actually looks close to how OpenCL from amdgpu-pro renders.

Today it sorta works, but looks worse. Some comparison screenshots:

Default view:
clover: https://i.imgur.com/kct6anR.png
amdgpu-pro: https://i.imgur.com/1FIQ07m.jpg

A little bit zoomed in;
clover: https://i.imgur.com/5SmwL6Q.png
amdgpu: https://i.imgur.com/CcPwcpl.png

Possibly it's just an image format mismatch, see
https://cgit.freedesktop.org/~funfunctor/mesa/commit/?h=clover-image-support-enabled&id=894fb7c558e83534855516b499bf66b33397e1ac

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