https://bugs.freedesktop.org/show_bug.cgi?id=97043
Bug ID: 97043
Summary: glxgears reported frame rate doesn't match actual
Product: Mesa
Version: 10.5
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Demos
Assignee: mesa-dev@lists.freedesktop.org
Reporter: b7.10110...@gmail.com
QA Contact: mesa-dev@lists.freedesktop.org
Running glxgears with the following command
LIBGL_ALWAYS_INDIRECT=1 glxgears
prints 60 FPS on my system, while actual picture updates are about 1-2 FPS.
This is due to command buffering I believe. The fix would be something like
this:
--- glxgears.c.orig 2014-03-22 16:59:24.000000000 +0400
+++ glxgears.c 2016-07-22 12:24:15.260412891 +0300
@@ -340,6 +340,10 @@
draw_gears();
glXSwapBuffers(dpy, win);
+ /* Make sure that the whole draw-swap cycle is complete before
+ measurements. Otherwise we'll have rare updates but still
+ report high frame rates with indirect rendering. */
+ glFinish();
frames++;
--
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