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Shows colours and layering of Mode 7 with EXTBG.
The row marked 0 uses pixel values from 0-127
The row marked 1 uses pixel values from 128-255
The BG palettes for 128+ are darkened to show that BG1 is using them even with EXTBG enabled
The 4 movable sprites are on their numbered layer.
Select = toggle direct color
Start = toggle BG1 or BG2
A/X/Y/B = select sprite 0/1/2/3 to move
d-pad = move sprite
Expected results:
- Indexed BG2
* Sprites 0,1 in between, 2,3 on top.
* Layer strips 0 and 1 have identical colours (indicates high bit of palette is forced to 0 on BG2).
- Direct BG2
* Direct colour disallowed, indexed colours on DC data. (Grey with green, yellow, and cyan streaks.)
- Indexed BG1
* Sprite 0 behind, 1,2,3 on top.
* "Layer 1" strip is slightly dim (indicates using full 8bpp palette, not just 7bpp).
- Direct BG1
* Like indexed BG1 but slightly darker due to reduced range of direct color.