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Background horizontal mosaic isn't shown as expected when horizontal position is changed midframe #1684

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GValiente opened this issue Mar 4, 2020 · 4 comments
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Background horizontal mosaic isn't shown as expected when horizontal position is changed midframe #1684

GValiente opened this issue Mar 4, 2020 · 4 comments
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hardware:2D Issues in the 2D/pixel pipeline subsystem platform:GBA Game Boy Advance-related issues
Milestone
mGBA 0.9.0

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@GValiente
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GValiente commented Mar 4, 2020 •
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Test rom:
mosaic-test.zip

mGBA tested versions:
0.8.1 and 6156-8d194fa.

If the horizontal position of the background is not changed midframe, horizontal mosaic is shown as expected.
Of all tested emulators, VBA is the only one which seems to get it right:

mGBA - (60 fps) - 0 8 1 3_4_2020 9_30_26 AM

No$gba Emulator 3_4_2020 9_29_57 AM

VisualBoyAdvance- 91% 3_4_2020 9_30_40 AM
@GValiente GValiente changed the title Background mosaic doesn't show as expected when horizontal position is changed midframe Background mosaic isn't shown as expected when horizontal position is changed midframe Mar 4, 2020
@GValiente
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GValiente commented Mar 4, 2020 •
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Byuu seems to get it right too:
mosaic-test 3_4_2020 9_45_51 AM

EDIT: Nope, the first column is wrong.

@GValiente GValiente changed the title Background mosaic isn't shown as expected when horizontal position is changed midframe Background horizontal mosaic isn't shown as expected when horizontal position is changed midframe Mar 4, 2020
@endrift
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endrift commented Aug 14, 2020

Do you have a non-animated version of this? It's kinda hard to compare against hardware when it's animating.

@endrift endrift added hardware:2D Issues in the 2D/pixel pipeline subsystem platform:GBA Game Boy Advance-related issues labels Aug 14, 2020
@GValiente
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GValiente commented Aug 14, 2020 •
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mgba_1684.zip

VBA seems to show the correct output:

vba

mGBA output:

mgba

@GValiente
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If it helps, here's the source code of the latest test rom:
https://github.com/GValiente/butano/tree/master/issues/mgba_1684

@endrift endrift added this to the mGBA 0.9.1 milestone Mar 21, 2021
@endrift endrift modified the milestones: mGBA 0.9.1, mGBA 0.9.0 Mar 24, 2021
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hardware:2D Issues in the 2D/pixel pipeline subsystem platform:GBA Game Boy Advance-related issues
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