This topic is for the purpose of discussing #7988: ParadaxeTH, DarkShamilKhan, Zekann, Aglar & rodonic01's Genesis Sonic the Hedgehog "100%" in 16:42.17

So because this TAS was done on Bizhawk, is there expected to be no camhack encode?

Unfortunately, yes.

Still waiting for the ring attack TAS.

So because this TAS was done on Bizhawk, is there expected to be no camhack encode?

The TAS is glitched as usual so you're not really missing anything.

So because this TAS was done on Bizhawk, is there expected to be no camhack encode?

Ported from Gens: Download camhack.lua

Language: lua
-- feos, 2023

-- addresses
local addr_base   = 0xD000
local addr_mode   = 0xD04B
local addr_cam1   = 0xF700
local addr_cam3   = 0xFDB8
local addr_cam4   = 0xF616
local addr_time   = 0xFE22

-- offsets
local offs_flags  = 1
local offs_posX   = 0x8
local offs_posY   = 0xC

-- constants
local SCREEN_W    = 320
local SCREEN_H    = 224
local LEVEL_H     = 2047
local SCROLLRATE  = 16
local FREEZE_SIZE = 16
local MAX_FRAMES  = 100

-- aliases
local rb   = mainmemory.readbyte
local rs16 = mainmemory.read_s16_be
local rs32 = mainmemory.read_s32_be
local ru32 = mainmemory.read_u32_be
local ws16 = mainmemory.write_s16_be
local ws32 = mainmemory.write_s32_be
local wu32 = mainmemory.write_u32_be

-- buffers
local freezebuffer = {}
local memorystate

gui.defaultPixelFont("gens") 

local function CamHack()
	client.invisibleemulation(false)
	
	local x      = rs16(addr_base + offs_posX)   -- character x position
	local y      = rs16(addr_base + offs_posY)   -- character y position
	local origx  = rs16(addr_cam1)               -- initial camera x position
	local origy  = rs16(addr_cam1 + 4)           -- initial camera y position
	local xx     = math.max(0, x - SCREEN_W / 2) -- desired camera x position
	local yy     =             y - SCREEN_H / 2  -- desired camera y position
	local flags  = rb(addr_base + offs_flags)
	local timer  = rs32(addr_time)
	local deltaX = SCROLLRATE
	
--	if flags && 0x80 ~= 0
	if bit.band(flags, 0x80) ~= 0
	or rb(0xF7CD) ~= 0
	or (x - origx <= SCREEN_W
	and (y - origy <= 240
	-- going downward through level-wraps
	or (y + LEVEL_H - origy <= SCREEN_H and origy >= LEVEL_H - SCREEN_H)
	-- going upward through level-wraps
	or (origy < 0 and (y >= LEVEL_H + origy or y <= origy + SCREEN_H)))
	or rb(addr_mode) == 0)
	then return end
	
	-- set the camera no more than 640 pixels distant
	if math.abs(xx - origx) > SCREEN_W * 2 then
		origx = math.max(0, xx - SCREEN_W * 2)
	end
	
	-- and always above target, because Sonic doesn't like externally forced upward scrolling
	if origy > yy then
		origy = yy - SCREEN_H * 2
	else
		origy = math.max(yy - SCREEN_H * 2, origy)
	end
	
	if xx < origx then
		deltaX = -deltaX
	end
	
	local numframes = 1 + math.floor(math.max(
		math.abs(xx - origx) / SCROLLRATE,
		math.abs(yy - origy) / SCROLLRATE))
	
	if numframes > MAX_FRAMES then
		numframes = MAX_FRAMES
	end
	
	memorystate = memorysavestate.savecorestate()
	
	for i = 1, FREEZE_SIZE do
		freezebuffer[i] = ru32(addr_base + i*4)
	end
	
	client.invisibleemulation(true)
	
	for i = 0, MAX_FRAMES * 2 do
		if i > numframes then break end
		
		if origy < -SCROLLRATE then origy = -SCROLLRATE end
		
		ws16(addr_cam1,     origx)
		ws16(addr_cam1 + 4, origy)
		ws32(addr_cam3,     origx)
		ws32(addr_cam4,     origy)
		ws32(addr_cam4 + 4, origx)
		ws32(addr_time, timer)
		
		for i = 1, FREEZE_SIZE do
			wu32(addr_base + i*4, freezebuffer[i])
		end
		
		client.seekframe(emu.framecount() + 1)
		
		if numframes < MAX_FRAMES and emu.islagged() then
			numframes = numframes + 1
		else
			-- the game doesn't like being forced to scroll up
			if yy > origy then
				origy = origy + math.min(SCROLLRATE, yy - origy)
			end
			
			if xx ~= origx then
				if math.abs(xx - origx) <= SCROLLRATE then
					origx = xx
				else
					origx = origx + deltaX
				end
			end
		end
	end
	
	--[[--
	gui.pixelText(10, 100, string.format(
		" pos: %4d x %4d\n"..
		"orig: %4d | %4d x %4d | %4d\n"..
		" cam: %4d %4d %4d\n"..
		"  xx: %4d | %4d yy: %4d | %4d",
		x, y,
		origx, rs16(addr_cam1),
		origy, rs16(addr_cam1+4),
		rs32(addr_cam3), rs32(addr_cam4), rs32(addr_cam4+4),
		xx, math.max(0, x - SCREEN_W / 2),
		yy, y - SCREEN_H / 2))
	--]]--
	
	client.invisibleemulation(false)
	client.seekframe(emu.framecount() + 1)
	client.invisibleemulation(true)
	memorysavestate.loadcorestate(memorystate)
	memorysavestate.removestate(memorystate)
	--client.invisibleemulation(false)
end
	
while true do
	CamHack()
	emu.frameadvance()
	gui.clearGraphics()
end

Mirror: User movie #638560487359337260

There are a few notes to mention about this lua, the first one is don't expect the audio to be perfect during the moments the camhack has to work. They end up getting crusty, so it would be best to replace the audio using the audio from the non camhack dump, they would be identical. The other thing to note is this lua doesn't have the ability to put sprites on top of other graphical layers, so that players can see here sonic is if he's ever behind walls. However there's an easy way to cheat this by dumping the camhack footage with every layer disabled except for sprites, which the steps look like this (the color code for the pink is $ff00ff): final output: here is the avisynth code I used to layer these:

Language: avisynth
main = avisource("blah camhack.avi").ConvertToRGB32
sprites = avisource("blah sprites.avi").ConvertToRGB32

maskclip = ColorKeyMask(sprites, $ff00ff, 1)
final = Overlay(main, sprites, mask=maskclip.ShowAlpha, mode="blend", opacity=1)

In the future this might become obsolete once there's a way to force the sprite layer on top, but in the case where that's not possible, this should work as an alternative.

This movie has been published. The posts before this message apply to the submission, and posts after this message apply to the published movie. ---- [5121] Genesis Sonic the Hedgehog "100%" by ParadaxeTH, DarkShamilKhan, Zekann, Aglar & rodonic01 in 16:42.17