--by pavetr.top/ds
RunConsoleCommand("spawnmenu_reload")

CreateConVar("cl_kill_fade_R", 0, FCVAR_ARCHIVE, "Red tone. (0-255)", 0, 255)
CreateConVar("cl_kill_fade_G", 0, FCVAR_ARCHIVE, "Green tone. (0-255)", 0, 255)
CreateConVar("cl_kill_fade_B", 150, FCVAR_ARCHIVE, "Blue tone. (0-255)", 0, 255)

CreateConVar("cl_kill_fade_brightness", 0.05, FCVAR_ARCHIVE, "Brightness. (-1 to 1)", -1, 1)
CreateConVar("cl_kill_fade_contrast", 1.3, FCVAR_ARCHIVE, "Contrast. (0-10)", 0, 10)
CreateConVar("cl_kill_fade_saturation", 1, FCVAR_ARCHIVE, "Saturation. (-10 to 10)", -10, 10)

CreateConVar("cl_kill_fade_transition", 2.3, FCVAR_ARCHIVE, "Transition to normal tone (the more the faster).", 1, 10)
CreateConVar("cl_kill_fade_brightness_transition_multiplier", 1.5, FCVAR_ARCHIVE, "Brightness transition multiplier to default parameter. (0.1-10)", 0.1, 9.9)
CreateConVar("cl_kill_fade_contrast_transition_multiplier", 2.8, FCVAR_ARCHIVE, "Contrast transition multiplier to default parameter. (0.1-10)", 0.1, 30)
CreateConVar("cl_kill_fade_saturation_transition_multiplier", 1, FCVAR_ARCHIVE, "Saturation transition multiplier to default parameter. (0.1-10)", 0.1, 30)

CreateConVar("cl_kill_fade_enabled", 1, FCVAR_ARCHIVE, "Enable/Disable effect on kill. (0-1)", 0, 1)

local alphascr = 0
local alphascg = 0
local alphascb = 0

local brightness = 0
local contrast = 1
local saturation = 1

local transition = 4

hook.Add("RenderScreenspaceEffects", "Rend", function()
	if tonumber("0.00" ..GetConVar("cl_kill_fade_transition"):GetString():gsub('%.', '')) == nil then transition = 0.005 else transition = tonumber("0.00" ..GetConVar("cl_kill_fade_transition"):GetString():gsub('%.', '')) end
	alphascr = math.Approach(alphascr, 0, transition)
	alphascg = math.Approach(alphascg, 0, transition)
	alphascb = math.Approach(alphascb, 0, transition)
	
	brightness = math.Approach(brightness, 0, transition*GetConVar("cl_kill_fade_brightness_transition_multiplier"):GetFloat())
	contrast = math.Approach(contrast, 1, transition*GetConVar("cl_kill_fade_contrast_transition_multiplier"):GetFloat())
	saturation = math.Approach(saturation, 1, transition*GetConVar("cl_kill_fade_saturation_transition_multiplier"):GetFloat())
	
	DrawColorModify( {
	[ "$pp_colour_addr" ] = alphascr,
	[ "$pp_colour_addg" ] = alphascg,
	[ "$pp_colour_addb" ] = alphascb,
	[ "$pp_colour_mulr" ] = alphascr,
	[ "$pp_colour_mulrg" ] = alphascg,
	[ "$pp_colour_mulrb" ] = alphascb,
	[ "$pp_colour_brightness" ] = brightness,
	[ "$pp_colour_contrast" ] = contrast,
	[ "$pp_colour_colour" ] = saturation
}) end )

function LowTaperFade()
	if(!GetConVar("cl_kill_fade_enabled"):GetBool()) then return end
	
	if tonumber("0." ..GetConVar("cl_kill_fade_R"):GetString()) == nil --R
	then
		LocalPlayer():PrintMessage(HUD_PRINTCONSOLE, "cl_kill_fade_R isn't a number. Type a number between 0-255 in the console.\n")
		alphascr = 0.0
	else
		alphascr = tonumber("0." ..GetConVar("cl_kill_fade_R"):GetString())
	end
	if tonumber("0." ..GetConVar("cl_kill_fade_G"):GetString()) == nil --G
	then
		LocalPlayer():PrintMessage(HUD_PRINTCONSOLE, "cl_kill_fade_G isn't a number. Type a number between 0-255 in the console.\n")
		alphascg = 0.0
	else
		alphascg = tonumber("0." ..GetConVar("cl_kill_fade_G"):GetString())
	end
	if tonumber("0." ..GetConVar("cl_kill_fade_B"):GetString()) == nil --B
	then
		LocalPlayer():PrintMessage(HUD_PRINTCONSOLE, "cl_kill_fade_B isn't a number. Type a number between 0-255 in the console.\n")
		alphascb = 0.120
	else
		alphascb = tonumber("0." ..GetConVar("cl_kill_fade_B"):GetString())
	end
	
	brightness = GetConVar("cl_kill_fade_brightness"):GetFloat() --brightness
	contrast = GetConVar("cl_kill_fade_contrast"):GetFloat() --contrast
	saturation = GetConVar("cl_kill_fade_saturation"):GetFloat() --saturation
end


gameevent.Listen( "entity_killed" )
hook.Add( "entity_killed", "entity_killed_example", function( data )

--if not data.entindex_attacker then return end
--if not data.entindex_killed then return end

	local inflictor_index = data.entindex_inflictor		// Same as Weapon:EntIndex() / weapon used to kill victim
	local attacker = Entity(data.entindex_attacker)		// Same as Player/Entity:EntIndex() / person or entity who did the damage
	local damagebits = data.damagebits			// DAMAGE_TYPE - use BIT operations to decipher damage types...
	local victim = Entity(data.entindex_killed)		// Same as Victim:EntIndex() / the entity / player victim



if attacker == LocalPlayer() and victim:IsValid() then

LowTaperFade()

end


end )


concommand.Add( "fadepreview", function()  
	LowTaperFade()
end )

local ConVarsDefault = {
cl_kill_fade_R = "0",
cl_kill_fade_G = "0",
cl_kill_fade_B = "0",
cl_kill_fade_transition = "5",

cl_kill_fade_brightness = "0",
cl_kill_fade_brightness_transition_multiplier = "1",

cl_kill_fade_contrast = "1",
cl_kill_fade_contrast_transition_multiplier = "1",

cl_kill_fade_saturation = "1",
cl_kill_fade_saturation_transition_multiplier = "1"
}

local ConVarsGTA = {
cl_kill_fade_R = "0",
cl_kill_fade_G = "0",
cl_kill_fade_B = "150",
cl_kill_fade_transition = "2.3",

cl_kill_fade_brightness = "0.05",
cl_kill_fade_brightness_transition_multiplier = "1.5",

cl_kill_fade_contrast = "1.3",
cl_kill_fade_contrast_transition_multiplier = "2.8",

cl_kill_fade_saturation = "1"
}

local ConVarsRDR = {
cl_kill_fade_R = "0",
cl_kill_fade_G = "0",
cl_kill_fade_B = "0",
cl_kill_fade_transition = "4",

cl_kill_fade_brightness = "0.10",
cl_kill_fade_brightness_transition_multiplier = "1",

cl_kill_fade_contrast = "1.50",
cl_kill_fade_contrast_transition_multiplier = "2",

cl_kill_fade_saturation = "1"
}

local ConVarsRage = {
cl_kill_fade_R = "255",
cl_kill_fade_G = "0",
cl_kill_fade_B = "0",
cl_kill_fade_transition = "6",

cl_kill_fade_brightness = "-0.12",
cl_kill_fade_brightness_transition_multiplier = "1",

cl_kill_fade_contrast = "1.3",
cl_kill_fade_contrast_transition_multiplier = "0.6",

cl_kill_fade_saturation = "2",
cl_kill_fade_saturation_transition_multiplier = "0.5"
}

local ConVarsDim = {
cl_kill_fade_R = "0",
cl_kill_fade_G = "0",
cl_kill_fade_B = "0",
cl_kill_fade_transition = "4.5",

cl_kill_fade_brightness = "-0.25",
cl_kill_fade_brightness_transition_multiplier = "0.8",

cl_kill_fade_contrast = "0.65",
cl_kill_fade_contrast_transition_multiplier = "0.8",

cl_kill_fade_saturation = "0.45",
cl_kill_fade_saturation_transition_multiplier = "1.4"
}

hook.Add( "PopulateToolMenu", "CustomMenuSettings", function()
	spawnmenu.AddToolMenuOption( "Options", "Screen Fade on Kill", "Screen_Fade", "#Settings", "", "", function( panel )
		panel:CheckBox( "Enabled", "cl_kill_fade_enabled" )
		
		local fadepresets = panel:ToolPresets( "Fade Preset", ConVarsDefault )
		fadepresets:AddOption("GTAV-Like", ConVarsGTA)
		fadepresets:AddOption("RDR-Like", ConVarsRDR)
		fadepresets:AddOption("Rage", ConVarsRage)
		fadepresets:AddOption("Dim", ConVarsDim)
		
		panel:AddControl( "Color",	{ Label = "Fade Color", Red = "cl_kill_fade_R", Green = "cl_kill_fade_G", Blue = "cl_kill_fade_B"}  )
		panel:NumSlider( "Fade Transition", "cl_kill_fade_transition", 1, 9.9, 1)
		
		panel:NumSlider( "Brightness", "cl_kill_fade_brightness", -1, 1)
		panel:NumSlider( "Brightness Transition Multiplier", "cl_kill_fade_brightness_transition_multiplier", 0.1, 10, 1)
		
		panel:NumSlider( "Contrast", "cl_kill_fade_contrast", 0, 10)
		panel:NumSlider( "Contrast Transition Multiplier", "cl_kill_fade_contrast_transition_multiplier", 0.1, 10, 1)
		
		panel:NumSlider( "Saturation", "cl_kill_fade_saturation", -10, 10)
		panel:NumSlider( "Saturation Transition Multiplier", "cl_kill_fade_saturation_transition_multiplier", 0.1, 30, 1)
		
		panel:Button( "PREVIEW", "fadepreview" )
	end )
end )