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addons/tfa-base/lua/tfa/modules/cl_tfa_particles_lua.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+
+-- Copyright (c) 2018-2020 TFA Base Devs
+
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
+-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
+
+-- The above copyright notice and this permission notice shall be included in all
+-- copies or substantial portions of the Software.
+
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+-- SOFTWARE.
+
+local vector_origin = Vector()
+
+TFA.Particles = TFA.Particles or {}
+TFA.Particles.FlareParts = {}
+TFA.Particles.VMAttachments = {}
+
+local VMAttachments = TFA.Particles.VMAttachments
+local FlareParts = TFA.Particles.FlareParts
+
+local ply, vm, wep
+
+local IsValid_ = FindMetaTable("Entity").IsValid
+local GetModel = FindMetaTable("Entity").GetModel
+local lastVMModel, lastVMAtts
+
+local lastRequired = 0
+local RealTime = RealTime
+local FrameTime = FrameTime
+local LocalPlayer = LocalPlayer
+local ipairs = ipairs
+local istable = istable
+local isfunction = isfunction
+local WorldToLocal = WorldToLocal
+local table = table
+
+local thinkAttachments = {}
+local slowThinkers = 0
+
+hook.Add("PreDrawEffects", "TFAMuzzleUpdate", function()
+	if lastRequired < RealTime() then return end
+
+	if not ply then
+		ply = LocalPlayer()
+	end
+
+	if not IsValid_(vm) then
+		vm = ply:GetViewModel()
+		if not IsValid_(vm) then return end
+	end
+
+	local vmmodel = GetModel(vm)
+
+	if vmmodel ~= lastVMModel then
+		lastVMModel = vmmodel
+		lastVMAtts = vm:GetAttachments()
+	end
+
+	if not lastVMAtts then return end
+
+	if slowThinkers == 0 then
+		for i in pairs(thinkAttachments) do
+			VMAttachments[i] = vm:GetAttachment(i)
+		end
+	else
+		for i = 1, #lastVMAtts do
+			VMAttachments[i] = vm:GetAttachment(i)
+		end
+	end
+
+	for _, v in ipairs(FlareParts) do
+		if v and v.ThinkFunc then
+			v:ThinkFunc()
+		end
+	end
+end)
+
+function TFA.Particles.RegisterParticleThink(particle, partfunc)
+	if not particle or not isfunction(partfunc) then return end
+
+	if not ply then
+		ply = LocalPlayer()
+	end
+
+	if not IsValid_(vm) then
+		vm = ply:GetViewModel()
+		if not IsValid_(vm) then return end
+	end
+
+	particle.ThinkFunc = partfunc
+
+	if IsValid(particle.FollowEnt) and particle.Att then
+		local angpos = particle.FollowEnt:GetAttachment(particle.Att)
+
+		if angpos then
+			particle.OffPos = WorldToLocal(particle:GetPos(), particle:GetAngles(), angpos.Pos, angpos.Ang)
+		end
+	end
+
+	local att = particle.Att
+
+	local isFast = partfunc == TFA.Particles.FollowMuzzle and att ~= nil
+	local isVM = particle.FollowEnt == vm
+
+	if isFast then
+		if isVM then
+			thinkAttachments[att] = (thinkAttachments[att] or 0) + 1
+		end
+	else
+		slowThinkers = slowThinkers + 1
+	end
+
+	table.insert(FlareParts, particle)
+
+	timer.Simple(particle:GetDieTime(), function()
+		if particle then
+			table.RemoveByValue(FlareParts, particle)
+		end
+
+		if not isFast then
+			slowThinkers = slowThinkers - 1
+		elseif isVM and att then
+			thinkAttachments[att] = thinkAttachments[att] - 1
+			if thinkAttachments[att] <= 0 then thinkAttachments[att] = nil end
+		end
+	end)
+
+	lastRequired = RealTime() + 0.5
+end
+
+function TFA.Particles.FollowMuzzle(self, first)
+	if lastRequired < RealTime() then
+		lastRequired = RealTime() + 0.5
+		return
+	end
+
+	lastRequired = RealTime() + 0.5
+
+	if self.isfirst == nil then
+		self.isfirst = false
+		first = true
+	end
+
+	if not IsValid_(ply) or not IsValid_(vm) then return end
+	wep = ply:GetActiveWeapon()
+	if IsValid(wep) and wep.IsCurrentlyScoped and wep:IsCurrentlyScoped() then return end
+
+	if not IsValid(self.FollowEnt) then return end
+	local owent = self.FollowEnt:GetOwner() or self.FollowEnt
+	if not IsValid(owent) then return end
+
+	local firvel
+
+	if first then
+		firvel = owent:GetVelocity() * FrameTime() * 1.1
+	else
+		firvel = vector_origin
+	end
+
+	if not self.Att or not self.OffPos then return end
+
+	if self.FollowEnt == vm then
+		local angpos = VMAttachments[self.Att]
+
+		if angpos then
+			local tmppos = LocalToWorld(self.OffPos, self:GetAngles(), angpos.Pos, angpos.Ang)
+			local npos = tmppos + self:GetVelocity() * FrameTime()
+			self.OffPos = WorldToLocal(npos + firvel, self:GetAngles(), angpos.Pos, angpos.Ang)
+			self:SetPos(npos + firvel)
+		end
+
+		return
+	end
+
+	local angpos = self.FollowEnt:GetAttachment(self.Att)
+
+	if angpos then
+		local tmppos = LocalToWorld(self.OffPos, self:GetAngles(), angpos.Pos, angpos.Ang)
+		local npos = tmppos + self:GetVelocity() * FrameTime()
+		self.OffPos = WorldToLocal(npos + firvel * 0.5, self:GetAngles(), angpos.Pos, angpos.Ang)
+		self:SetPos(npos + firvel)
+	end
+end