Completely rewritten the grate's flowing mechanics to use more modular subroutines and functions.
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rdococ
parent
06a195e08f
commit
c2c48ebebe
149
grate.lua
149
grate.lua
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@ -3,48 +3,103 @@ minetest.register_node("rmod:grate", {
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tiles = {"rmod_grate.png"},
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groups = {oddly_breakable_by_hand = 1},
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use_texture_alpha = true,
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drawtype = "glasslike",
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drawtype = "allfaces", --"glasslike",
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paramtype = "light",
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})
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local function get_level(node, def)
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local level = node.param2 % 16
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if level > 8 then level = level - 8 end
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if def and def.liquidtype == "source" then level = 8 end -- Ooh, this node is a SOURCE! MAX LEVEL!
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if def and def.liquidtype ~= "flowing" and def.liquidtype ~= "source" then
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level = def.floodable and 0 or 8 -- Okay, the node isn't liquid. But we can still determine whether it contains undisplaceable matter.
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end
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if not def then level = 8 end
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return level
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end
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local function get_variables(pos)
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local node = minetest.get_node(pos)
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local name
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if node then name = node.name else return end
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local def = minetest.registered_nodes[name]
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local level = get_level(node, def)
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return node, name, def, level
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end
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local function calculate_level(pos)
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return ({get_variables(pos)})[4]
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end
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local function attempt_flow_to(pos1, pos2, dec)
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-- Try flowing from pos1 to pos2.
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local node1, name1, def1, level1 = get_variables(pos1)
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-- Flowing1 is the node we may or may not eventually place.
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local flowing1 = def1.liquid_alternative_flowing
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local node2, name2, def2, level2 = get_variables(pos2)
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if def1.liquidtype ~= "source" and def1.liquidtype ~= "flowing" then return end
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if not flowing1 then return end -- node might not be a liquid.
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-- If we're flowing down, gravity is most likely going to aid.
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-- Therefore, we should set the values accordingly.
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if pos2.y < pos1.y then
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level1 = 8 + dec
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if def2.liquidtype == "flowing" then
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level2 = 0
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dec = 0
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end
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-- Opposite reasoning of above.
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elseif pos2.y > pos1.y then return end
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-- When water flows normally, it slowly decreases as it spreads outwards.
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-- Dec is the variable applied to the originating liquid's level, which
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-- the resulting output flow is decreased by.
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-- Usually this value is 2, but I'm allowing for customization.
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if level1 - dec <= level2 then return end
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if level1 - dec < 0 then return end
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minetest.set_node(pos2, {
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name = flowing1,
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param1 = pos1.param1,
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param2 = level1 - dec
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})
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return true
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end
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local function grate_step(pos, offset)
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local neigh = vector.add(pos, offset)
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local neigh_node = minetest.get_node(neigh)
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local neigh_name
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if neigh_node then neigh_name = neigh_node.name else return end
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local neigh_def = minetest.registered_nodes[neigh_name]
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local pos1 = vector.add(pos, offset)
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if not attempt_flow_to(pos1, vector.subtract(pos, {x=0,y=1,z=0}), 2) then -- If we can't flow below...
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local left_offset = {x = offset.z, y = 0, z = -offset.x}
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local right_offset = {x = -offset.z, y = 0, z = offset.x}
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attempt_flow_to(pos1, vector.subtract(pos, offset), 2) -- Try flowing forward.
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attempt_flow_to(pos1, vector.add(pos, left_offset), 2) -- Try flowing left.
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attempt_flow_to(pos1, vector.add(pos, right_offset), 2) -- And try flowing right.
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end
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--[[local neigh = vector.add(pos, offset)
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local neigh_node, neigh_name, neigh_def, level = get_variables(neigh)
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if not neigh_def then return end -- Unknown nodes can't flow.
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if neigh_def.liquidtype ~= "source" and neigh_def.liquidtype ~= "flowing" then return end -- Non-liquids can't flow at all.
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-- Check its level.
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local level = neigh_node.param2 % 16
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if level > 8 then level = level - 8 end
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if neigh_def.liquidtype == "source" then level = 8 end
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-- Check the opposing neighbor.
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local opposite = vector.subtract(pos, offset)
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local opposite_node = minetest.get_node(opposite)
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local opposite_name
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if opposite_node then opposite_name = opposite_node.name else return end
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local opposite_def = minetest.registered_nodes[opposite_name]
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if not opposite_def then return end
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local flowto_opposite = true
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if not opposite_def.floodable then
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if not opposite_def.liquidtype then flowto_opposite = false end
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if opposite_def.walkable then flowto_opposite = false end
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local opposite_level = opposite_node.param2 % 16
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if opposite_level > 8 then opposite_level = opposite_level - 8 end
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if opposite_def.liquidtype == "source" then opposite_level = 8 end
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if opposite_level > level - 2 or opposite_def.liquidtype == "source" then flowto_opposite = false end
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end -- Liquids can't flow into higher level liquids.
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local neigh_flowing = neigh_def.liquid_alternative_flowing
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if not neigh_flowing then return end -- Improperly configured liquids can't flow.
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-- Check the opposing neighbor.
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local opposite = vector.subtract(pos, offset)
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local flowto_opposite = true
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local opposite_level = calculate_level(opposite)
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if opposite_level > level - 2 then flowto_opposite = false end
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local flow_to = opposite
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local gravity_affected = false
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if vector.equals(offset, {x=0, y=-1, z=0}) then
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-- Silly code, water can't flow UP!
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@ -61,16 +116,16 @@ local function grate_step(pos, offset)
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-- Great, water is flowing from the side, but what if the grate is above air?
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-- We should check if the water can flow down, first.
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local grav = vector.subtract(pos, {x=0, y=1, z=0})
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local grav_node = minetest.get_node(grav)
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local grav_name
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if grav_node then grav_name = grav_node.name end
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-- Meet the grav_node - the node that's below the grate.
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-- If liquids can flow into this node, we can forget about the opposite_node.
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if grav_node and grav_name == "air" then
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local grav_level = calculate_level(grav)
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if grav_level < level - 2 then
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-- OOP! Sudden course change!
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flow_to = grav
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gravity_affected = true
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end
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end
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@ -88,29 +143,17 @@ local function grate_step(pos, offset)
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-- WAIT! We're not done.
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if offset.y == 0 then
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if offset.y == 0 and not gravity_affected then
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local left_flow = {x = offset.z, y = 0, z = -offset.x}
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local left_pos = vector.add(pos, left_flow)
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local left_node = minetest.get_node(left_pos)
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local left_name
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if left_node then left_name = left_node.name end
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local left_def = left_name and minetest.registered_nodes[left_name]
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local right_flow = {x = -offset.z, y = 0, z = offset.x}
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local right_pos = vector.add(pos, right_flow)
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local right_node = minetest.get_node(right_pos)
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local right_name
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if right_node then right_name = right_node.name end
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local right_def = right_name and minetest.registered_nodes[right_name]
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local left_level = left_node.param2 % 16
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if left_level > 8 then left_level = left_level - 8 end
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if left_def.liquidtype == "source" then left_level = 8 end
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local left_level = calculate_level(left_pos)
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local right_level = right_node.param2 % 16
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if right_level > 8 then right_level = right_level - 8 end
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if right_def.liquidtype == "source" then right_level = 8 end
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local right_level = calculate_level(right_pos)
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if left_node and (left_name == "air" or (left_def.liquidtype == "flowing" and left_level < level - 2)) then
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if left_level < level - 2 then
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-- May as well spread here, too.
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minetest.set_node(left_pos, {
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name = neigh_flowing,
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@ -118,7 +161,7 @@ local function grate_step(pos, offset)
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param2 = new_param2
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})
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end
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if right_node and (right_name == "air" or (right_def.liquidtype == "flowing" and right_level < level - 2)) then
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if right_level < level - 2 then
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-- May as well spread here, too.
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minetest.set_node(right_pos, {
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name = neigh_flowing,
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@ -126,7 +169,7 @@ local function grate_step(pos, offset)
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param2 = new_param2
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})
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end
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end
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end]]
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end
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minetest.register_abm({
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