Few questions about GL on GTK Master
- Date: Fri, 3 Aug 2018 10:53:38 +0800
- From: Chun-wei Fan (范君維) via gtk-devel-list <gtk-devel-list@xxxxxxxxx>
- Subject: Few questions about GL on GTK Master
Please pardon my ignorance about how things went in terms of the
development for GTK+-4.
Few questions that I would like to ask:
-It seems to me that we don't do glBlitFramebuffer() directly in the
code, as opposed to GTK+-3.x, as the FPS I had was about 20.0 versus
60.0 (on GTK+-3.23.x) on my Windows 10 laptop (i7-6700HQ, nVidia 960m
GTX graphics). Can I know in GSK (or so) any pointers for the
conditions that a "fast path" would be selected, as opposed to a
"fallback/software (slow) path" , that I believe I am hitting? It seems
that I have the required extensions (as in GTK+-3) for using
glBlitFramebuffer(), for both Desktop OpenGL and EGL via Googls's ANGLE,
so is there something else that is being checked for in GTK+ master?
-At this point, it is possible to run with the GL GSK renderer while
forcing EGL/GLES (i.e., setting GDK_DEBUG=gl-gles). I saw shader
compilation errors for both blur.fs.glsl and color_matrix.fs.glsl on
both EGL/ANGLE, as well as running with the X11 backend on Ubuntu 18.04
(the 'f' suffix for floats which are not allowed on GLSL 1.00;
unresolved overloading of max() in blur.fs.glsl, invalid
casts/conversions of int vs float).
Any pointers on these regards will be great.
With blessings, and cheers!
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