72 lines
2.2 KiB
Lua
72 lines
2.2 KiB
Lua
-- shows the background collision codes
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-- floor, water, solid, or empty
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function get_bg_collision(x, y)
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local VERTICAL_SCROLL = emu.read(0xfc, emu.memType.cpu)
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local HORIZONTAL_SCROLL = emu.read(0xfd, emu.memType.cpu)
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local PPUCTRL_SETTINGS = emu.read(0xff, emu.memType.cpu)
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local adjusted_y = y + VERTICAL_SCROLL
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local adjusted_x = x + HORIZONTAL_SCROLL
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if adjusted_y >= 0xf0 then
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adjusted_y = adjusted_y + 0x0f
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adjusted_y = adjusted_y - 255
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end
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-- $10 is always #$00, except when moving cart is calling get_bg_collision
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local nametable_number = (PPUCTRL_SETTINGS ~ 0x00) & 0x01
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if adjusted_x > 255 then
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nametable_number = nametable_number ~ 1
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adjusted_x = adjusted_x - 255
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end
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adjusted_y = (adjusted_y >> 2) & 0x3c
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adjusted_x = adjusted_x >> 4
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local bg_collision_offset = (adjusted_x >> 2) | adjusted_y
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if nametable_number == 1 then
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bg_collision_offset = bg_collision_offset | 0x40;
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end
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local collisionCodeByte = emu.read(0x680 + bg_collision_offset, emu.memType.cpu)
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adjusted_x = adjusted_x & 0x03;
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local collisionCode = 0
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if adjusted_x == 0 then
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collisionCode = collisionCodeByte >> 6
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elseif adjusted_x == 1 then
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collisionCode = collisionCodeByte >> 4
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elseif adjusted_x == 2 then
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collisionCode = collisionCodeByte >> 2
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else
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collisionCode = collisionCodeByte
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end
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collisionCode = collisionCode & 0x03;
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local floorColor = 0x508fbc8f
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local waterColor = 0x500096FF
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local solidColor = 0x50A9A9A9
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local tileColor = 0x0
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if collisionCode == 0x01 then
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tileColor = floorColor
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elseif collisionCode == 0x02 then
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tileColor = waterColor
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elseif collisionCode == 0x03 then
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tileColor = solidColor
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end
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if collisionCode ~= 0 then
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emu.drawRectangle(x, y, 16, 16, tileColor, true)
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end
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end
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function Main()
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local VERTICAL_SCROLL = emu.read(0xfc, emu.memType.cpu)
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local HORIZONTAL_SCROLL = emu.read(0xfd, emu.memType.cpu)
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for i = 0,300,16 do
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for j = 0,300,16 do
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get_bg_collision(i - math.fmod(HORIZONTAL_SCROLL, 16), j - math.fmod(VERTICAL_SCROLL, 16))
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end
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end
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end
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emu.addEventCallback(Main, emu.eventType.endFrame) |