add 10 bit formats to virtualgl

[totaam]

Issue migrated from trac ticket # 1577

component: packaging | priority: major | resolution: fixed

2017-07-12 13:07:34: antoine created the issue

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Follow up from #1309.

Without this, it is quite difficult to use the 10 bpc mode.
You get with glxgears:

Error: couldn't get an RGB, Double-buffered visual

AFAICT, this shouldn't be too hard: we don't want anything fancy, no compression support.

[totaam]

2017-07-20 18:06:26: antoine changed status from new to assigned

[totaam]

2017-07-20 18:06:26: antoine commented

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Worth a try, may not be too hard.

[totaam]

2017-07-28 10:34:07: antoine uploaded file vgl-30bpc.patch (8.0 KiB)

patch with debug which adds 30bpc to the X11 transport

[totaam]

2017-07-28 10:34:23: antoine uploaded file vgl-30bpc-minimal.patch (4.2 KiB)

minimal patch

[totaam]

2017-07-28 10:40:41: antoine commented

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The patch above applies cleanly to current virtualgl 2.5.3 and allows us to forward "r210" pixel data as GL_RGB10_A2 / GL_UNSIGNED_INT_2_10_10_10_REV.

Tested with #1553 and the commands:

• server:

xpra start --start-child=xterm --pixel-depth=30

• client: xpra attach
• test app:

vglrun -d :1 python xpra/client/gtk_base/example/gl_colors_gradient.py

The changes in banding are very noticeable when going from 10 down to 8.

Edit: made a pull request for upstream.

[totaam]

2017-10-24 17:11:13: antoine commented

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Latest comment: This unfortunately required more in-depth modifications to VirtualGL, which led me down the rabbit hole of overhauling all of the horribly outdated pixel format and conversion stuff. I should have it checked in by the end of this week.

[totaam]

2017-10-26 05:36:42: antoine changed status from assigned to closed

[totaam]

2017-10-26 05:36:42: antoine set resolution to fixed

[totaam]

2017-10-26 05:36:42: antoine commented

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Merged: This has been implemented in the dev branch.