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Use GDMA for tile transfers #639

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FredrIQ opened this issue May 28, 2021 · 3 comments
Open

Use GDMA for tile transfers #639

FredrIQ opened this issue May 28, 2021 · 3 comments
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optimizations refactoring

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@FredrIQ
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FredrIQ commented May 28, 2021 •
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Consider using GDMA transfers (rHDMA1-5 registers) for tile copying to VRAM, if applicable. It's roughly 2-10 times faster compared to the Prism routine (worst vs best case improvement), generally around 4 times faster with LCD enabled and 10 times with it disabled.

There appears to be a brand new discovery of GDMA limitations in LCD mode 2 that isn't yet fully understood, so I'm filing this issue for revisiting later when more details are known.
@FredrIQ
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FredrIQ commented May 29, 2021

For reference about mode2 issues: gbdev/pandocs#299

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FredrIQ commented Aug 4, 2022

This issue has been resolved on pandocs. GDMA is safe in Mode 2. So replacing Prism routines with GDMA when applicable should work perfectly.

@FredrIQ FredrIQ closed this as completed Aug 4, 2022
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FredrIQ commented Aug 4, 2022

This resolves the caveat blocking the issue, meaning this is a feature I can adapt. Reopening the issue to clarify this

@FredrIQ FredrIQ reopened this Aug 4, 2022
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