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by klodolph 1126 days ago
The “fast path” for macOS exists. I don’t know what is happening in Qt-land, but if you want to throw pixels at the screen really fast, you can do it through Core Animation. You can feed it a buffer of pixel data.

My experience is that this is extremely fast.
1 comments
davedx 1125 days ago
Good to know about. This was also my intuition, that there must still exist ways to blast pixel data quickly, but it's not the "happy path" in modern graphics API's.
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klodolph 1125 days ago
Blasting pixel data from the CPU to the GPU is normally about as "happy path" as it gets. The entire architecture is designed to make that kind of operation super efficient and super fast.

It's the opposite direction (GPU to CPU) which is a pain in the ass. Still fast if you do it correctly, but it's easy to end up with a stall.

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