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use the offest field of bgofs rather than the value directly

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Matthew Berry 2021-05-01 12:40:43 -07:00
parent c584c29fd6
commit 655bd67855
1 changed files with 2 additions and 2 deletions
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4
src/crab/ppu.cr
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@ -155,10 +155,10 @@ class PPU
screen_base = 0x800_u32 * bgcnt.screen_base_block
character_base = bgcnt.character_base_block.to_u32 * 0x4000
effective_row = (@vcount.to_u32 + bgvofs.value) & th
effective_row = (@vcount.to_u32 + bgvofs.offset) & th
ty = effective_row >> 3
240.times do |col|
effective_col = (col + bghofs.value) & tw
effective_col = (col + bghofs.offset) & tw
tx = effective_col >> 3
se_idx = se_index(tx, ty, bgcnt.screen_size)