Fix Lua script that used client.seekframe.

Author: SuuperW

Assets/Lua/GBA/SonicAdvance_CamHack.lua

@@ -6,6 +6,25 @@ local addr_offY = 0x5B98
 local addr_camX = 0x59D0
 local addr_camY = 0x59D2
 
+-- Seek forward to a given frame.
+-- This will unpause emulation, and restore the users' desired pause state when seeking is completed.
+local function seek_frame(frame)
+	local pause = client.unpause()
+	while emu.framecount() < frame do
+		-- The user may pause mid-seek, perhaps even by accident.
+		-- In this case, we will unpause but remember that the user wants to pause at the end.
+		if client.ispaused() then
+			pause = true
+			client.unpause()
+		end
+		-- Yield, not frameadvance. With frameadvance we cannot detect pauses, since frameadvance would not return.
+		-- This is true even if we have just called client.unpause.
+		emu.yield()
+	end
+	
+	if pause then client.pause() end
+end
+
 while true do
 	client.invisibleemulation(true)
 	local memorystate = memorysavestate.savecorestate()
@@ -21,9 +40,9 @@ while true do
 	mainmemory.write_u16_le(addr_camX, Xval)
 	mainmemory.write_u16_le(addr_camY, Yval)
 
-	client.seekframe(emu.framecount()+1)
+	seek_frame(emu.framecount()+1)
 	client.invisibleemulation(false)
-	client.seekframe(emu.framecount()+1)
+	seek_frame(emu.framecount()+1)
 	client.invisibleemulation(true)
 	memorysavestate.loadcorestate(memorystate)
 	memorysavestate.removestate(memorystate)