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sprite flipping

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This commit is contained in:
Matthew Berry 2021-01-06 00:02:09 -08:00
parent b29bc55df9
commit cb3280fea6
1 changed files with 2 additions and 0 deletions
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src/crab/ppu.cr
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@ -166,11 +166,13 @@ class PPU
width, height = SIZES[sprite.obj_shape][sprite.obj_size]
if y_coord <= row < y_coord + height
sprite_y = row - y_coord
sprite_y = height - sprite_y - 1 if bit?(sprite.attr1, 13)
y = sprite_y & 7
x_min, x_max = x_coord, Math.min(240, x_coord + width)
(x_min...x_max).each_with_index do |col, sprite_x|
next if col < 0
next if scanline[col] > 0
sprite_x = width - sprite_x - 1 if bit?(sprite.attr1, 12)
x = sprite_x & 7
tile_id = sprite.character_name
tile_id_offset = (sprite_x >> 3) + (sprite_y >> 3) * (@dispcnt.obj_character_vram_mapping ? width >> 3 : 0x20)