Qt/QML support

[lmife]

I compiled grate (mesa 21.2.2 branch) for a Apalis T30 based device (which is powered by a Tegra 3) to replace the properitary NVIDIA drivers. While e.g. Xorg runs fine, starting a simple Qt/QML based program (dynamicscene example) fails:

QSGContext::initialize: depth buffer support missing, expect rendering errors QSGContext::initialize: stencil buffer support missing, expect rendering errors ../git/src/gallium/drivers/grate/grate_stream.c:217/grate_stream_push_reloc(): drm_tegra_pushbuf_relocate() failed -22 ../git/src/gallium/drivers/grate/grate_stream.c:209/grate_stream_push_reloc(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:209/grate_stream_push_reloc(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:209/grate_stream_push_reloc(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:337/grate_stream_push_words(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:209/grate_stream_push_reloc(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:236/grate_stream_push(): Stream status isn't CONSTRUCT ../git/src/gallium/drivers/grate/grate_stream.c:288/grate_stream_end(): Stream status isn't CONSTRUCT Segmentation fault
This happens when using an xcb-based Qt platform driver as well when using the eglfs Qt platform driver.

Is this to be expected in the current development state? xeglgears/eglgears_x11 seem to run fine (at least running with 60 FPS without too much CPU load). In another thread I read that the grate mesa driver is currently only a proof of concept and more than glxgears is not really supposed to work?

[digetx]

That is expected to happen today. If yours Qt application doesn't use fancy animations, then you can make it very usable with the current upstream driver stack by forcing Qt to use software render as shown at https://github.com/grate-driver/grate/wiki/Grate-driver#software-gl.