Support DRM modifiers (e.g. frames with multiple objects)

[maximbaz]

Support DRM modifiers (e.g. frames with multiple objects)

[maximbaz]

As this becomes a popular request, leaving a few links in case a brave soul decides to help out:

• https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/VK_EXT_image_drm_format_modifier.html#_usage_patterns (Import part)
• https://github.com/FFmpeg/FFmpeg/blob/a7e099732405c5f048fb306d8e3c1dffe0d60e41/libavutil/hwcontext_vulkan.c#L2642 (most promising code example I think -> make sure to switch to latest master)
• https://github.com/nowrep/obs-vkcapture/blob/master/src/vklayer.c#L548
• https://github.com/nyorain/kms-vulkan/blob/master/vulkan.c#L975

If anyone does start working on it, please leave a ping, I'll do my best to help out 🙂

[maximbaz]

Welcome to the club, he-he 😄 I've updated the README about this issue, hopefully this will bring some interest to get help on this, as my head is already overwhelmed by working with GPU.

b733d9b

Workaround is to export WLR_DRM_NO_MODIFIERS=1 before you start your compositor (e.g. sway). This might increase CPU usage a bit, so adding a proper support is definitely wanted, but I've been using this workaround for many months and it's not that bad...