more mods

mods/everness/mapgen_after.lua

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+--[[
+    Everness. Never ending discovery in Everness mapgen.
+    Copyright (C) 2025 SaKeL
+
+    This library 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 library 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.
+
+--]]
+
+if Everness.async_mapgen_active then
+    --
+    -- Hybrid Async Mapgen Mode (Minetest 5.9.0+ / Luanti)
+    --
+    -- The heavy VoxelManip manipulation, biome logic, and schematics are executed
+    -- on the dedicated background mapgen worker thread in `mapgen_async.lua`.
+    -- The main server thread on_generated below only executes post-generation tasks
+    -- that require the active ServerMap environment (node metadata, chest loot, fix_light).
+    --
+    core.register_on_generated(function(minp, maxp, blockseed)
+        local rand = PcgRandom(blockseed)
+        local biomemap = core.get_mapgen_object('biomemap') or {}
+        local gennotify = core.get_mapgen_object('gennotify') or {}
+        local shared_args = {}
+
+        local chunk_biomes = {}
+        for i = 1, #biomemap do
+            chunk_biomes[biomemap[i]] = true
+        end
+
+        local active_defs = {}
+        for _, def in ipairs(Everness.on_generated_queue) do
+            if def.can_run(biomemap, chunk_biomes) then
+                table.insert(active_defs, def)
+            end
+        end
+
+        if #active_defs == 0 then
+            return
+        end
+
+        -- Populate loot chests placed by structures in this chunk
+        local chest_positions = core.find_nodes_in_area(minp, maxp, { 'everness:chest' })
+        if #chest_positions > 0 then
+            Everness:populate_loot_chests(chest_positions)
+        end
+
+        -- Run any main-thread after_write_to_map handlers (e.g. core.fix_light, node placement)
+        for _, def in ipairs(active_defs) do
+            if def.after_write_to_map then
+                shared_args[def.name] = shared_args[def.name] or {}
+                def.after_write_to_map(shared_args[def.name], gennotify, rand, minp, maxp)
+            end
+        end
+    end)
+    return
+end
+
+--
+-- Synchronous Mapgen Mode (Fallback for Minetest <= 5.8)
+--
+-- Localize data buffer table outside the loop, to be re-used for all
+-- mapchunks, therefore minimising memory use.
+local data = {}
+local p2data = {}
+
+core.register_on_generated(function(minp, maxp, blockseed)
+    local rand = PcgRandom(blockseed)
+    local biomemap = core.get_mapgen_object('biomemap') or {}
+    local gennotify = core.get_mapgen_object('gennotify') or {}
+    local vm, emin, emax = core.get_mapgen_object('voxelmanip')
+    local area = VoxelArea:new({ MinEdge = emin, MaxEdge = emax })
+    vm:get_data(data)
+    vm:get_param2_data(p2data)
+    local shared_args = {}
+
+    local chunk_biomes = {}
+    for i = 1, #biomemap do
+        chunk_biomes[biomemap[i]] = true
+    end
+
+    local active_defs = {}
+    for _, def in ipairs(Everness.on_generated_queue) do
+        if def.can_run(biomemap, chunk_biomes) then
+            table.insert(active_defs, def)
+        end
+    end
+
+    -- on_data
+    for _, def in ipairs(active_defs) do
+        if def.on_data then
+            shared_args[def.name] = shared_args[def.name] or {}
+            def.on_data(minp, maxp, area, data, p2data, gennotify, rand, shared_args[def.name], biomemap)
+        end
+    end
+
+    vm:set_data(data)
+    vm:set_param2_data(p2data)
+
+    -- after_set_data
+    for _, def in ipairs(active_defs) do
+        if def.after_set_data then
+            shared_args[def.name] = shared_args[def.name] or {}
+            def.after_set_data(minp, maxp, vm, area, data, p2data, gennotify, rand, shared_args[def.name])
+        end
+    end
+
+    vm:set_lighting({ day = 0, night = 0 })
+    vm:calc_lighting()
+    vm:update_liquids()
+    vm:write_to_map()
+
+    -- after_write_to_map
+    for _, def in ipairs(active_defs) do
+        if def.after_write_to_map then
+            shared_args[def.name] = shared_args[def.name] or {}
+            def.after_write_to_map(shared_args[def.name], gennotify, rand, minp, maxp)
+        end
+    end
+end)