Hi David, That's a very good point I hadn't thought about. I will create a testing Wayland client benchmark and measure the time it takes for QPainer to perform different drawing operations using both SHM and DMA. I'll also test buffer resizing and measure the overall (client/compositor) performance by counting the number of frame callbacks (FPS) returned by different compositors.
To ensure the benchmark provides a representative performance evaluation for Qt, I would appreciate it if you could clarify the following doubts: 1. Does Qt respect the wl_surface frame callbacks sent by the compositor, or does it simply draw as many frames as it can? 2. When using SHM, does Qt reuse the same buffer on a wl_surface if it receives a wl_buffer release event before a wl_surface frame callback? And does it use more than one otherwise? 3. If DMA was implemented, I suppose double buffering would be mandatory, or should I consider triple buffering or more? Cheers, Eduardo Hopperdietzel
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