fceux/output/luaScripts/SpritesSimple.lua

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-- Simple sprite visualizer
-- Draws a box around all sprites on screen.
-- rainwarrior 8/23/2016
sprite_color = "#FF00FF" -- change to customize color
sprite_height_last = 8
sprite_height = 8
function oam_dma(a,s,v)
local oam = v * 256
for i=1,64 do
local is = (i-1) * 4
local x0 = memory.readbyte(oam + is + 3)
local x1 = x0 + 7
local y0 = memory.readbyte(oam + is + 0) + 1
local y1 = y0 + (sprite_height_last - 1)
gui.box(x0,y0,x1,y1,"",sprite_color)
end
end
function ppu_ctrl(a,s,v)
if AND(v,0x20) == 0 then
sprite_height = 8
else
sprite_height = 16
end
end
function frame_end()
-- information about sprite height will be behind by 1 frame
-- (or potentially wrong if changed before the end of the frame)
-- in most games this doesn't change from frame to frame, though
sprite_height_last = sprite_height
end
-- main
memory.registerwrite(0x4014,1,oam_dma)
memory.registerwrite(0x2000,1,ppu_ctrl)
emu.registerafter(frame_end)
while (true) do
emu.frameadvance()
end