Splatterhouse 2 (JP) collision viewer.

output/Lua/Genesis/Splatterhouse 2 (JP).lua

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+--Splatterhouse 2 (JP) Collision box viewer v1.0
+--Author Pasky
+--For use with Bizhawk
+
+
+local cx = 0
+local player = false
+local attack = false
+
+local function camera()
+	cx = mainmemory.read_u16_be(0x9E)
+end
+
+local function drawAxis(x1,y1,x2,y2)
+	local x = ((x2 - x1) / 2) + x1
+	local y = ((y2 - y1) / 2) + y1
+	local xrad = (x2 - x1) / 2
+	local yrad = (y2 - y1) / 2
+	gui.drawLine(x-xrad,y,x+xrad,y)
+	gui.drawLine(x,y-yrad,x,y+yrad)
+end
+
+local function touch_collision()
+	
+	local A6 = bit.band(emu.getregister("M68K A6"),0xFFFF)
+	local e = {0,0,0,0}
+	local p = {0,0,0,0}
+	
+	for i = 0,3,1 do
+		e[i] = mainmemory.read_s16_be(A6 - 0x0A - (i * 2))
+		p[i] = mainmemory.read_s16_be(A6 - 0x02 - (i * 2))
+	end
+	gui.drawBox(e[0]-cx,e[2],e[1]-cx,e[3],0xFFFF0000,0x40FF0000)
+	if player == false then
+		gui.drawBox(p[0]-cx,p[2],p[1]-cx,p[3],0xFF0000FF,0x400000FF)
+		if mainmemory.read_u16_be(0xEA) > 0 then
+			drawAxis(p[0]-cx,p[2],p[1]-cx,p[3])
+		end
+		player = true
+	end
+end
+
+local function attack_collision()
+	local A6 = bit.band(emu.getregister("M68K A6"),0xFFFF)
+	local a = {0,0,0,0}
+	for i = 0,3,1 do
+		a[i] = mainmemory.read_s16_be(A6 - 0x1A - (i * 2))
+	end
+	if attack == false then
+		gui.drawBox(a[0]-cx,a[2],a[1]-cx,a[3],0xFFFFFFFF,0x40FFFFFF)
+		attack = true
+	end
+	
+end
+
+local function reset()
+	player = false
+	attack = false
+end
+
+event.onmemoryexecute(touch_collision,0x014508)
+event.onmemoryexecute(attack_collision,0x0143E0)
+
+while true do
+	camera()
+	emu.frameadvance()
+	reset()
+end