[mythtv] OpenGL questions
pb.mythtv at gmail.com
Sun Mar 31 18:41:11 UTC 2019
On 3/31/19 5:56 AM, Mark Kendall wrote:
Thank you for the detailed reply.
I am building and testing some of the sample OpenGL programs., and I am
using apitrace to see what is going on.
One interesting thing I found - A sample program that uses QOpenGLWidget
to display a window with just a triangle does hundreds of OpenGL calls
that are not generated by the user code. Apart from displaying the
triangle, it uses two textures and hundreds of other calls, plus some
extra shaders that are not in the user code.
On the other hand a sample that uses QWindow and QOpenGLFunctions to
display a triangle does not create any extra textures or shaders and
seems to only generate the OpenGL code that is requested by the user code.
I have not yet tried QOpenGLWindow, I don't know how it compares to
QWindow or OpenGLWidget.
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