src/client/meshgen/collector.h


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/*
Minetest
Copyright (C) 2018 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once
#include <array>
#include <vector>
#include "irrlichttypes.h"
#include <S3DVertex.h>
#include "client/tile.h"

struct PreMeshBuffer
{
	TileLayer layer;
	std::vector<u16> indices;
	std::vector<video::S3DVertex> vertices;

	PreMeshBuffer() = default;
	explicit PreMeshBuffer(const TileLayer &layer) : layer(layer) {}
};

struct MeshCollector
{
	std::array<std::vector<PreMeshBuffer>, MAX_TILE_LAYERS> prebuffers;

	// clang-format off
	void append(const TileSpec &material,
			const video::S3DVertex *vertices, u32 numVertices,
			const u16 *indices, u32 numIndices);
	void append(const TileSpec &material,
			const video::S3DVertex *vertices, u32 numVertices,
			const u16 *indices, u32 numIndices,
			v3f pos, video::SColor c, u8 light_source);
	// clang-format on

private:
	// clang-format off
	void append(const TileLayer &material,
			const video::S3DVertex *vertices, u32 numVertices,
			const u16 *indices, u32 numIndices,
			u8 layernum, bool use_scale = false);
	void append(const TileLayer &material,
			const video::S3DVertex *vertices, u32 numVertices,
			const u16 *indices, u32 numIndices,
			v3f pos, video::SColor c, u8 light_source,
			u8 layernum, bool use_scale = false);
	// clang-format on

	PreMeshBuffer &findBuffer(const TileLayer &layer, u8 layernum, u32 numVertices);
};
--atan2 counts angles clockwise, minetest does counterclockwise
--local print=function(t) minetest.log("action", t) minetest.chat_send_all(t) end
local print=function() end

local wagon={
	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
	--physical = true,
	visual = "mesh",
	mesh = "wagon.b3d",
	visual_size = {x=3, y=3},
	textures = {"black.png"},
	is_wagon=true,
	wagon_span=1,--how many index units of space does this wagon consume
	attach_offset={x=0, y=0, z=0},
	view_offset={x=0, y=0, z=0},
}


function wagon:on_rightclick(clicker)
	--print("[advtrains] wagon rightclick")
	if not clicker or not clicker:is_player() then
		return
	end
	if not self.initialized then
		print("[advtrains] not initiaalized")
		return
	end
	if clicker:get_player_control().aux1 then
		--advtrains.dumppath(self:train().path)
		--minetest.chat_send_all("at index "..(self:train().index or "nil"))
		--advtrains.invert_train(self.train_id)
		minetest.chat_send_all(dump(self:train()))
		return
	end	
	local no=self:get_seatno(clicker:get_player_name())
	if no then
		self:get_off(no)
	else
		self:show_get_on_form(clicker:get_player_name())
	end
end

function wagon:train()
	return advtrains.trains[self.train_id]
end

--[[about 'initalized':
	when initialized is false, the entity hasn't got any data yet and should wait for these to be set before doing anything
	when loading an existing object (with staticdata), it will be set
	when instanciating a new object via add_entity, it is not set at the time on_activate is called.
	then, wagon:initialize() will be called
	
	wagon will save only uid in staticdata, no serialized table
]]
function wagon:on_activate(sd_uid, dtime_s)
	print("[advtrains][wagon "..((sd_uid and sd_uid~="" and sd_uid) or "no-id").."] activated")
	self.object:set_armor_groups({immortal=1})
	if sd_uid and sd_uid~="" then
		--legacy
		--expect this to be a serialized table and handle
		if minetest.deserialize(sd_uid) then
			self:init_from_wagon_save(minetest.deserialize(sd_uid).unique_id)
		else
			self:init_from_wagon_save(sd_uid)
		end
	end
	self.entity_name=self.name
	
	--duplicates?
	for _,wagon in pairs(minetest.luaentities) do
		if wagon.is_wagon and wagon.initialized and wagon.unique_id==self.unique_id and wagon~=self then--i am a duplicate!
			print("[advtrains][wagon "..((sd_uid and sd_uid~="" and sd_uid) or "no-id").."] duplicate found, removing")
			self.object:remove()
			return
		end
	end
	
	if self.custom_on_activate then
		self:custom_on_activate(staticdata_table, dtime_s)
	end
end

function wagon:get_staticdata()
	if not self:ensure_init() then return end
	print("[advtrains][wagon "..((self.unique_id and self.unique_id~="" and self.unique_id) or "no-id").."]: saving to wagon_save")
	--save to table before being unloaded
	advtrains.wagon_save[self.unique_id]=advtrains.merge_tables(self)
	advtrains.wagon_save[self.unique_id].entity_name=self.name
	advtrains.wagon_save[self.unique_id].name=nil
	advtrains.wagon_save[self.unique_id].object=nil
	return self.unique_id
end
--returns: uid of wagon
function wagon:init_new_instance(train_id, properties)
	self.unique_id=os.time()..os.clock()
	self.train_id=train_id
	for k,v in pairs(properties) do
		if k~="name" and k~="object" then
			self[k]=v
		end
	end
	self.initialized=true
	print("init_new_instance "..self.unique_id.." ("..self.train_id..")")
	return self.unique_id
end
function wagon:init_from_wagon_save(uid)
	if not advtrains.wagon_save[uid] then
		self.object:remove()
		return
	end
	self.unique_id=uid
	for k,v in pairs(advtrains.wagon_save[uid]) do
		if k~="name" and k~="object" then
			self[k]=v
		end
	end
	if not self.train_id or not self:train() then
		self.object:remove()
		return
	end
	self.initialized=true
	minetest.after(1, function() self:reattach_all() end)
	print("init_from_wagon_save "..self.unique_id.." ("..self.train_id..")")
	advtrains.update_trainpart_properties(self.train_id)
end
function wagon:ensure_init()
	if self.initialized then return true end
	self.object:setvelocity({x=0,y=0,z=0})
	return false
end

-- Remove the wagon
function wagon:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
	if not self:ensure_init() then return end
	if not puncher or not puncher:is_player() then
		return
	end
	if self.owner and puncher:get_player_name()~=self.owner then
		minetest.chat_send_player(puncher:get_player_name(), "This wagon is owned by "..self.owner..", you can't destroy it.")
		return
	end
	
	if minetest.setting_getbool("creative_mode") then
		if not self:destroy() then return end
		
		local inv = puncher:get_inventory()
		if not inv:contains_item("main", self.name) then
			inv:add_item("main", self.name)
		end
	else
		local pc=puncher:get_player_control()
		if not pc.sneak then
			minetest.chat_send_player(puncher:get_player_name(), "Warning: If you destroy this wagon, you only get some steel back! If you are sure, shift-leftclick the wagon.")
			return
		end

		if not self:destroy() then return end

		local inv = puncher:get_inventory()
		for _,item in ipairs(self.drops or {self.name}) do
			inv:add_item("main", item)
		end
	end
end
function wagon:destroy()
	--some rules:
	-- you get only some items back
	-- single left-click shows warning
	-- shift leftclick destroys
	-- not when a driver is inside
	
	for _,_ in pairs(self.seatp) do
		return
	end
	
	if self.custom_may_destroy then
		if not self.custom_may_destroy(self, puncher, time_from_last_punch, tool_capabilities, direction) then
			return
		end
	end
	if self.custom_on_destroy then
		self.custom_on_destroy(self, puncher, time_from_last_punch, tool_capabilities, direction)
	end
	
	print("[advtrains][wagon "..((self.unique_id and self.unique_id~="" and self.unique_id) or "no-id").."]: destroying")
	
	self.object:remove()

	table.remove(self:train().trainparts, self.pos_in_trainparts)
	advtrains.update_trainpart_properties(self.train_id)
	advtrains.wagon_save[self.unique_id]=nil
	if self.discouple then self.discouple.object:remove() end--will have no effect on unloaded objects
	return true
end


function wagon:on_step(dtime)
	if not self:ensure_init() then return end
	
	local t=os.clock()
	local pos = self.object:getpos()
	
	if not pos then
		print("["..self.unique_id.."][fatal] missing position (object:getpos() returned nil)")
		return
	end

	self.entity_name=self.name
	
	--is my train still here
	if not self.train_id or not self:train() then
		print("[advtrains][wagon "..self.unique_id.."] missing train_id, destroying")
		self.object:remove()
		return
	elseif not self.initialized then
		self.initialized=true
	end
	if not self.seatp then
		self.seatp={}
	end

	--custom on_step function
	if self.custom_on_step then
		self:custom_on_step(self, dtime)
	end

	--driver control
	for seatno, seat in ipairs(self.seats) do
		if seat.driving_ctrl_access then
			local driver=self.seatp[seatno] and minetest.get_player_by_name(self.seatp[seatno])
			if driver and driver:get_player_control_bits()~=self.old_player_control_bits then
				local pc=driver:get_player_control()
				if pc.sneak then --stop
					self:train().tarvelocity=0
				elseif (not self.wagon_flipped and pc.up) or (self.wagon_flipped and pc.down) then --faster
					self:train().tarvelocity=math.min(self:train().tarvelocity+1, advtrains.all_traintypes[self:train().traintype].max_speed or 10)
				elseif (not self.wagon_flipped and pc.down) or (self.wagon_flipped and pc.up) then --slower
					self:train().tarvelocity=math.max(self:train().tarvelocity-1, -(advtrains.all_traintypes[self:train().traintype].max_speed or 10))
				elseif pc.aux1 then --slower
					if true or math.abs(self:train().velocity)<=3 then--TODO debug
						self:get_off(seatno)
						return
					else
						minetest.chat_send_player(driver:get_player_name(), "Can't get off driving train!")
					end
				end
				self.old_player_control_bits=driver:get_player_control_bits()
			end
			if driver then
				advtrains.set_trainhud(driver:get_player_name(), advtrains.hud_train_format(self:train(), self.wagon_flipped))
			end
		end
	end

	local gp=self:train()

	--DisCouple
	if self.pos_in_trainparts and self.pos_in_trainparts>1 then
		if gp.velocity==0 then
			if not self.discouple or not self.discouple.object:getyaw() then
				local object=minetest.add_entity(pos, "advtrains:discouple")
				if object then
					local le=object:get_luaentity()
					le.wagon=self
					--box is hidden when attached, so unuseful.
					--object:set_attach(self.object, "", {x=0, y=0, z=self.wagon_span*10}, {x=0, y=0, z=0})
					self.discouple=le
				else
					print("Couldn't spawn DisCouple")
				end
			end
		else
			if self.discouple and self.discouple.object:getyaw() then
				self.discouple.object:remove()
			end
		end
	end
	--for path to be available. if not, skip step
	if not advtrains.get_or_create_path(self.train_id, gp) then
		self.object:setvelocity({x=0, y=0, z=0})
		return
	end
	if not self.pos_in_train then
		print("["..self.unique_id.."][fatal] no pos_in_train set.")
		return
	end
	
	local index=advtrains.get_real_path_index(self:train(), self.pos_in_train)
	--print("trainindex "..gp.index.." wagonindex "..index)
	
	--position recalculation
	local first_pos=gp.path[math.floor(index)]
	local second_pos=gp.path[math.floor(index)+1]
	if not first_pos or not second_pos then
		--print("[advtrains] object "..self.unique_id.." path end reached!")
		self.object:setvelocity({x=0,y=0,z=0})
		return
	end
	
	--checking for environment collisions(a 3x3 cube around the center)
	if not gp.recently_collided_with_env then
		local collides=false
		for x=-1,1 do
			for y=0,2 do
				for z=-1,1 do
					local node=minetest.get_node_or_nil(vector.add(first_pos, {x=x, y=y, z=z}))
					if (advtrains.train_collides(node)) then
						collides=true
					end
				end
			end
		end
		if collides then
			gp.recently_collided_with_env=true
			gp.velocity=-0.5*gp.velocity
			gp.tarvelocity=0
		end
	end
	
	--FIX: use index of the wagon, not of the train.
	local velocity=gp.velocity/(gp.path_dist[math.floor(index)] or 1)
	local acceleration=(gp.last_accel or 0)/(gp.path_dist[math.floor(index)] or 1)
	local factor=index-math.floor(index)
	local actual_pos={x=first_pos.x-(first_pos.x-second_pos.x)*factor, y=first_pos.y-(first_pos.y-second_pos.y)*factor, z=first_pos.z-(first_pos.z-second_pos.z)*factor,}
	local velocityvec={x=(first_pos.x-second_pos.x)*velocity*-1, z=(first_pos.z-second_pos.z)*velocity*-1, y=(first_pos.y-second_pos.y)*velocity*-1}
	local accelerationvec={x=(first_pos.x-second_pos.x)*acceleration*-1, z=(first_pos.z-second_pos.z)*acceleration*-1, y=(first_pos.y-second_pos.y)*acceleration*-1}
	
	--some additional positions to determine orientation
	local aposfwd=gp.path[math.floor(index+2)]
	local aposbwd=gp.path[math.floor(index-1)]
	
	local yaw
	if aposfwd and aposbwd then
		yaw=advtrains.get_wagon_yaw(aposfwd, second_pos, first_pos, aposbwd, factor)+math.pi--TODO remove when cleaning up
	else
		yaw=math.atan2((first_pos.x-second_pos.x), (second_pos.z-first_pos.z))
	end
	if self.wagon_flipped then
		yaw=yaw+math.pi
	end
	
	self.updatepct_timer=(self.updatepct_timer or 0)-dtime
	if not self.old_velocity_vector 
			or not vector.equals(velocityvec, self.old_velocity_vector)
			or not self.old_acceleration_vector 
			or not vector.equals(accelerationvec, self.old_acceleration_vector)
			or self.old_yaw~=yaw
			or self.updatepct_timer<=0 then--only send update packet if something changed
			self.object:setpos(actual_pos)
		self.object:setvelocity(velocityvec)
		self.object:setacceleration(accelerationvec)
		self.object:setyaw(yaw)
		self.updatepct_timer=2
		if self.update_animation then
			self:update_animation(gp.velocity)
		end
	end
	
	
	self.old_velocity_vector=velocityvec
	self.old_acceleration_vector=accelerationvec
	self.old_yaw=yaw
	printbm("wagon step", t)
end

function advtrains.get_real_path_index(train, pit)
	local pos_in_train_left=pit
	local index=train.index
	if pos_in_train_left>(index-math.floor(index))*(train.path_dist[math.floor(index)] or 1) then
		pos_in_train_left=pos_in_train_left - (index-math.floor(index))*(train.path_dist[math.floor(index)] or 1)
		index=math.floor(index)
		while pos_in_train_left>(train.path_dist[index-1] or 1) do
			pos_in_train_left=pos_in_train_left - (train.path_dist[index-1] or 1)
			index=index-1
		end
		index=index-(pos_in_train_left/(train.path_dist[index-1] or 1))
	else
		index=index-(pos_in_train_left/(train.path_dist[math.floor(index-1)] or 1))
	end
	return index
end

function wagon:get_on(clicker, seatno)
	if not self.seatp then
		self.seatp={}
	end
	if not self.seats[seatno] then return end
	if self.seatp[seatno] then
		self:get_off(seatno)
	end
	self.seatp[seatno] = clicker:get_player_name()
	advtrains.player_to_wagon_mapping[clicker:get_player_name()]={wagon=self, seatno=seatno}
	clicker:set_attach(self.object, "", self.seats[seatno].attach_offset, {x=0,y=0,z=0})
	clicker:set_eye_offset(self.seats[seatno].view_offset, self.seats[seatno].view_offset)
end
function wagon:get_off_plr(pname)
	local no=self:get_seatno(pname)
	if no then
		self:get_off(no)
	end
end
function wagon:get_seatno(pname)
	for no, cont in ipairs(self.seatp) do
		if cont==pname then
			return no
		end
	end
	return nil
end
function wagon:get_off(seatno)
	if not self.seatp[seatno] then return end
	local pname = self.seatp[seatno]
	local clicker = minetest.get_player_by_name(pname)
	advtrains.player_to_wagon_mapping[pname]=nil
	advtrains.set_trainhud(pname, "")
	if clicker then
		clicker:set_detach()
		clicker:set_eye_offset({x=0,y=0,z=0}, {x=0,y=0,z=0})
	end
	self.seatp[seatno]=nil
end
function wagon:show_get_on_form(pname)
	if not self.initialized then return end
	local form, comma="size[5,7]label[0.5,0.5;Select seat:]textlist[0.5,1;4,6;seat;", ""
	for seatno, seattbl in ipairs(self.seats) do
		local addtext, colorcode="", ""
		if self.seatp and self.seatp[seatno] then
			colorcode="#FF0000"
			addtext=" ("..self.seatp[seatno]..")"
		end
		form=form..comma..colorcode..seattbl.name..addtext
		comma=","
	end
	minetest.show_formspec(pname, "advtrains_geton_"..self.unique_id, form..";0,false")
end
minetest.register_on_player_receive_fields(function(player, formname, fields)
	local uid=string.match(formname, "^advtrains_geton_(.+)$")
	if uid and fields.seat then
		local val=minetest.explode_textlist_event(fields.seat)
		if val and val.type=="CHG" then
			--get on
			for _,wagon in pairs(minetest.luaentities) do
				if wagon.is_wagon and wagon.initialized and wagon.unique_id==uid then
					wagon:get_on(player, val.index)
					minetest.show_formspec(player:get_player_name(), "none", "")
				end
			end
		end
	end
end)
function wagon:reattach_all()
	if not self.seatp then self.seatp={} end
	for seatno, pname in pairs(self.seatp) do
		local p=minetest.get_player_by_name(pname)
		if p then
			self:get_on(p ,seatno)