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update sprite priority behavior to make golden sun work (not documented in gbatek or tonc)

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This commit is contained in:
Matthew Berry 2021-02-26 20:17:55 -08:00
parent fb3354521c
commit 625b79fc35
1 changed files with 5 additions and 4 deletions
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9
src/crab/ppu.cr
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@ -275,10 +275,11 @@ class PPU
pal_idx += (sprite.palette_number << 4) if pal_idx > 0
end
if sprite.obj_mode == 0b10 && pal_idx > 0
@sprite_pixels[col] = @sprite_pixels[col].copy_with window: true
elsif @sprite_pixels[col].palette == 0 || @sprite_pixels[col].priority > sprite.priority
@sprite_pixels[col] = SpritePixel.new(sprite.priority, pal_idx.to_u16, sprite.obj_mode == 0b01, @sprite_pixels[col].window)
if sprite.obj_mode == 0b10
@sprite_pixels[col] = @sprite_pixels[col].copy_with window: true if pal_idx > 0
elsif sprite.priority < @sprite_pixels[col].priority || @sprite_pixels[col].palette == 0
@sprite_pixels[col] = @sprite_pixels[col].copy_with priority: sprite.priority
@sprite_pixels[col] = @sprite_pixels[col].copy_with palette: pal_idx.to_u16, blends: sprite.obj_mode == 0b01 if pal_idx > 0
end
end
end