-- @ Version: SCREEN SPACE SHADERS - UPDATE 19
-- @ Description: LUT script
-- @ Author: https://www.moddb.com/members/ascii1457
-- @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders

local ssfx_lut_default = { group = 1, intensity = 1.00 }
local ssfx_lut_transition_speed = 0.005

-- Internal vars
local ssfx_lut_group1 = 0
local ssfx_lut_group2 = 0
local ssfx_lut_lerp = 0

local ssfx_lut_lerp_target = 0
local ssfx_lut_int = 0
local ssfx_lut_lerp_done = true

local DebugGroup = 0;

-- Set a LUT table for a specific map
local ssfx_maps = {
	["jupiter"]					= { group = 25, intensity = 1.0 },
	["jupiter_underground"]		= { group = 14, intensity = 1.0 },
	["k00_marsh"]				= { group = 23, intensity = 1.0 },
	["k01_darkscape"]			= { group = 21, intensity = 1.0 },
	["k02_trucks_cemetery"]		= { group = 29, intensity = 1.0 },
	["l01_escape"]				= { group = 21, intensity = 1.0 },
	["l02_garbage"]				= { group = 28, intensity = 1.0 },
	["l03_agroprom"]			= { group = 24, intensity = 1.0 },
	["l03u_agr_underground"]	= { group = 32, intensity = 1.0 },
	["l04_darkvalley"]			= { group = 27, intensity = 1.0 },
	["l04u_labx18"]				= { group = 14, intensity = 1.0 },
	["l05_bar"]					= { group = 18, intensity = 1.0 },
	["l06_rostok"]				= { group = 19, intensity = 1.0 },
	["l07_military"]			= { group = 20, intensity = 1.0 },
	["l08_yantar"]				= { group = 30, intensity = 1.0 },
	["l08u_brainlab"]			= { group = 14, intensity = 1.0 },
	["l09_deadcity"]			= { group = 18, intensity = 1.0 },
	["l10_limansk"]				= { group = 17, intensity = 1.0 },
	["l10_radar"]				= { group = 17, intensity = 1.0 },
	["l10_red_forest"]			= { group = 26, intensity = 1.0 },
	["l10u_bunker"]				= { group = 14, intensity = 1.0 },
	["l11_hospital"]			= { group = 31, intensity = 1.0 },
	["l11_pripyat"]				= { group = 22, intensity = 1.0 },
	["l12_stancia"]				= { group = 17, intensity = 1.0 },
	["l12_stancia_2"]			= { group = 25, intensity = 1.0 },
	["l12u_control_monolith"]	= { group = 14, intensity = 1.0 },
	["l12u_sarcofag"]			= { group = 14, intensity = 1.0 },
	["l13_generators"]			= { group = 20, intensity = 1.0 },
	["l13u_warlab"]				= { group = 14, intensity = 1.0 },
	["labx8"]					= { group = 14, intensity = 1.0 },
	["pripyat"]					= { group = 18, intensity = 1.0 },
	["zaton"]					= { group = 21, intensity = 1 },
	["y04_pole"]				= { group = 30, intensity = 1.0 },
	["bunker_a1"]				= { group = 14, intensity = 1.0 },
}

local function ssfx_lut_transition()

	get_console():execute("ssfx_lut (" .. ssfx_lut_int .. "," .. ssfx_lut_group1 .. "," .. ssfx_lut_group2 .. "," .. ssfx_lut_lerp .. ")")
	
end


function ssfx_lut_diminish()
	
	-- Frame independent smoothing
	local smoothing = math.min(ssfx_lut_transition_speed * device().time_delta / 20, 0.19)
	
	-- Let's go!
	if (ssfx_lut_lerp < ssfx_lut_lerp_target) then
		ssfx_lut_lerp = ssfx_lut_lerp + smoothing
	else
		ssfx_lut_lerp = ssfx_lut_lerp - smoothing
	end
	
	if math.abs(ssfx_lut_lerp - ssfx_lut_lerp_target) <= ssfx_lut_transition_speed then

		ssfx_lut_group1 = ssfx_lut_group2
		ssfx_lut_group2 = 0
		ssfx_lut_lerp = 0
		ssfx_lut_lerp_target = 0

		ssfx_lut_lerp_done = true
	end
	
end

function ssfx_lut_change(group, insta)

	if (ssfx_lut_lerp_done == false) then return end

	if (insta == true) then
		ssfx_lut_group1 = group
		ssfx_lut_lerp = 0
		ssfx_lut_lerp_target = 0
		ssfx_lut_lerp_done = true
		ssfx_lut_transition()
	else

		ssfx_lut_group2 = group
		ssfx_lut_lerp_target = 1

		ssfx_lut_lerp_done = false

	end

end

-- DEBUG
local function ssfx_on_key_press(dik)

	local bind = dik_to_bind(dik)
	local kb = key_bindings

	if bind == kb.kWPN_RELOAD then
		DebugGroup = DebugGroup + 1
		ssfx_lut_change(DebugGroup, false)
	end

end

local function actor_on_update()

	--local game_hours = level.get_time_hours()
	--printf("LUT TIME : %s", game_hours)

	if (ssfx_lut_lerp_done == false) then

		ssfx_lut_diminish()
		ssfx_lut_transition()

	end


end

local function actor_on_first_update()

	if (ssfx_maps[level.name()]) then
		Map_LUT = ssfx_maps[level.name()].group or ssfx_lut_default.group
		ssfx_lut_int = ssfx_maps[level.name()].intensity or ssfx_lut_default.intensity
	else
		Map_LUT = ssfx_lut_default.group
		ssfx_lut_int = ssfx_lut_default.intensity
	end


	ssfx_lut_change(Map_LUT, true)

end

function on_option_change()
	
end

function on_game_start()

	--RegisterScriptCallback("on_key_press", ssfx_on_key_press)

	-- General Functions
	RegisterScriptCallback("actor_on_first_update", actor_on_first_update)
	RegisterScriptCallback("actor_on_update", actor_on_update)
	RegisterScriptCallback("on_option_change", on_option_change)
	
	-- Read and apply settigns
	on_option_change()
end