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0 pointsjcelerier3y ago0 comments

But when you do software rendering you don't need to redraw the entire frame buffer, just the parts that changed, which can be very small even at 8k - e.g. the box of a checkbox being switched

0 pointsjcelerier3y ago0 comments

But when you do software rendering you don't need to redraw the entire frame buffer, just the parts that changed, which can be very small even at 8k - e.g. the box of a checkbox being switched

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4 comments · 2 top-level

ben-schaaf3y ago· 2 in thread

Scrolling requires redrawing most if not the whole framebuffer.

HideousKojima3y ago

With scrolling couldn't you just shift the existing framebuffer up/down and only draw the newly scrolled-to parts?

kevingadd3y ago

The GPU buffering model doesn't usually let you read the previous frame like that these days, so you would need a scratch surface. That increases your bandwidth and memory requirements, so shifting doesn't end up being much faster if it's faster at all.

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kllrnohj3y ago

You don't need to redraw the entire framebuffer with GPU rendering, either. It's perfectly possible to do small, partial updates.

See for example https://registry.khronos.org/EGL/extensions/EXT/EGL_EXT_buff...

And https://registry.khronos.org/EGL/extensions/KHR/EGL_KHR_part...

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