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authorIgor Torrente <igormtorrente@gmail.com>2022-09-05 16:08:09 -0300
committerMelissa Wen <melissa.srw@gmail.com>2022-09-05 20:18:42 -0100
commitbc0d7fdefec62e0cb83c1bcd3c7bd033f5e826e0 (patch)
tree95ef6b3a3651eb7a53aa6a3a735d75f63c8cd3c4 /Documentation/gpu/vkms.rst
parent8ba1648567e289c90fa4f65b4204d0f160e22ac3 (diff)
downloadlinux-bc0d7fdefec62e0cb83c1bcd3c7bd033f5e826e0.tar.gz
drm: vkms: Supports to the case where primary plane doesn't match the CRTC
We will remove the current assumption that the primary plane has the same size and position as CRTC and that the primary plane is the bottom-most in zpos order, or is even enabled. At least as far as the blending machinery is concerned. For that we will add CRTC dimension information to `vkms_crtc_state` and add a opaque black backgound color. Because now we need to fill the background, we had a loss in performance with this change. Results running the IGT[1] test `igt@kms_cursor_crc@pipe-a-cursor-512x512-onscreen` ten times: | Frametime | |:--------------------------------------------:| | Implementation | Previous | This commit | |:---------------:|:---------:|:--------------:| | frametime range | 5~18 ms | 10~22 ms | | Average | 8.47 ms | 12.32 ms | [1] IGT commit id: bc3f6833a12221a46659535dac06ebb312490eb4 V6: Improve the commit description (Pekka Paalanen). Update some comments (Pekka Paalanen). Remove some fields from `vkms_crtc_state` and move where some variables are set (Pekka Paalanen). Reviewed-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Igor Torrente <igormtorrente@gmail.com> Signed-off-by: Melissa Wen <melissa.srw@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220905190811.25024-8-igormtorrente@gmail.com
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@@ -121,8 +121,7 @@ There's lots of plane features we could add support for:
- ARGB format on primary plane: blend the primary plane into background with
translucent alpha.
-- Support when the primary plane isn't exactly matching the output size: blend
- the primary plane into the black background.
+- Add background color KMS property[Good to get started].
- Full alpha blending on all planes.