Details
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Bug
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Resolution: Invalid
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P2: Important
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None
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5.12.3, 5.15.3
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Mac1:
macOS Catalina 10.15.7
MacBook Pro (16-inch, 2019)
2.6Ghz 6-Core Intel Core i7
16GB 2667Mhz DDR4
AMD Radeon Pro 5300M 4GB
Intel UHD Graphics 630 1536MB
Mac2:
macOS Mojave 10.14.5
MacBook Pro (15-inch, Mid 2012)
2.3Ghz Intel Core i7
8GB 1600 Mhz DDR3
NVIDIA GeForce GT 650M, 512MB
Intel HD Graphics 4000 1536 MBMac1: macOS Catalina 10.15.7 MacBook Pro (16-inch, 2019) 2.6Ghz 6-Core Intel Core i7 16GB 2667Mhz DDR4 AMD Radeon Pro 5300M 4GB Intel UHD Graphics 630 1536MB Mac2: macOS Mojave 10.14.5 MacBook Pro (15-inch, Mid 2012) 2.3Ghz Intel Core i7 8GB 1600 Mhz DDR3 NVIDIA GeForce GT 650M, 512MB Intel HD Graphics 4000 1536 MB
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macOS
Description
This issue does not happen on Linux or Windows (tested on CentOS7 and Windows 10), only on macOS (tested on Catalina 10.15.7 and Mojave 10.14.5).
Rendering a simple rotating triangle only reach 40 fps on macOS inside a QOpenGLWindow , while it reaches the display refresh rate on Linux and Windows (60 fps). Note that for comparison on macOS, this is not issue inside a QGLWidget or a QOpenGLWidget.
Note that this is visible during the rotation, you can visually perceive that the animation inside a QOpenGLWindow is not as smooth as with QGLWidget or QOpenGLWidget.
The attached source archive (it includes a README.txt) demonstrates the issue with QOpenGLWindow and also provide comparative test programs with QGLWidget and QOpenGLWidget. It is rotating a red triangle on a green background with a fixed pipeline and immediate mode, nothing fancy.