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reduce tile indexing logic

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This commit is contained in:
Matthew Berry 2021-01-03 18:00:38 -08:00
parent 0c5be3a7ed
commit e205057788
1 changed files with 2 additions and 8 deletions
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10
src/crab/ppu.cr
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@ -167,14 +167,8 @@ class PPU
next if scanline[col] > 0
x = sprite_x & 7
tile_id = sprite.character_name
if @dispcnt.obj_character_vram_mapping
tile_id += (sprite_y >> 3) * (width >> 3)
tile_id += sprite_x >> 3
else
tile_id += (sprite_y >> 3) * 0x20
tile_id += sprite_x >> 3
end
palettes = @vram[base + tile_id * 0x20 + y * 4 + (x >> 1)]
tile_id_offset = (sprite_x >> 3) + (sprite_y >> 3) * (@dispcnt.obj_character_vram_mapping ? width >> 3 : 0x20)
palettes = @vram[base + (tile_id + tile_id_offset) * 0x20 + y * 4 + (x >> 1)]
pal_idx = (sprite.palette_number << 4) + ((palettes >> ((x & 1) * 4)) & 0xF)
scanline[col] = (@pram.to_unsafe + 0x200).as(UInt16*)[pal_idx]
end