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Make ShiftExistingBiomes available via API (#40)

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* bug fixes

Fixes wrong new_y_min when shift_existing_biomes() shifts a biome below the nether floor,
find_surface_anchorPos() no longer assumes y=0 will be outside the nether.
Nil-reference fixed when a mods tries to register a portal after mods are finished loading, but the portal shape+material was already registered by another mod.

* Make ShiftExistingBiomes available via API

makes the ShiftExistingBiomes function available to other mods via the nether global, since it's not a simple function and biomes would also need to be shifted if another mod wants to add a second nether layer.

* Allow layers to extend the depth of nether effects

Mods can set/lower nether.DEPTH_FLOOR_LAYERS when creating a layer under the nether. This allows multiple layer mods to know where their ceiling should start, and to be included in the effects which only happen in the nether.

* document nether API

More of a tentative interop guide than an API.
Use snake_case for API functions.
This commit is contained in:
Treer
2021-07-18 16:44:37 +10:00
committed by GitHub
parent 54613d673a
commit 52038017f3
8 changed files with 122 additions and 30 deletions
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25
init.lua
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@@ -76,6 +76,19 @@ if nether.DEPTH_FLOOR + 1000 > nether.DEPTH_CEILING then
end
nether.DEPTH = nether.DEPTH_CEILING -- Deprecated, use nether.DEPTH_CEILING instead.
-- DEPTH_FLOOR_LAYERS gives the bottom Y of all locations that wish to be
-- considered part of the Nether.
-- DEPTH_FLOOR_LAYERS Allows mods to insert extra layers below the
-- Nether, by knowing where their layer ceiling should start, and letting
-- the layers be included in effects which only happen in the Nether.
-- If a mod wishes to add a layer below the Nether it should read
-- nether.DEPTH_FLOOR_LAYERS to find the bottom Y of the Nether and any
-- other layers already under the Nether. The mod should leave a small gap
-- between DEPTH_FLOOR_LAYERS and its ceiling (e.g. use DEPTH_FLOOR_LAYERS - 6
-- for its ceiling Y, so there is room to shift edge-case biomes), then set
-- nether.DEPTH_FLOOR_LAYERS to reflect the mod's floor Y value, and call
-- shift_existing_biomes() with DEPTH_FLOOR_LAYERS as the floor_y argument.
nether.DEPTH_FLOOR_LAYERS = nether.DEPTH_FLOOR
-- A debug-print function that understands vectors etc. and does not
-- evaluate when debugging is turned off.
@@ -163,7 +176,7 @@ The expedition parties have found no diamonds or gold, and after an experienced
local destination_pos = vector.divide(surface_anchorPos, nether.FASTTRAVEL_FACTOR)
destination_pos.x = math.floor(0.5 + destination_pos.x) -- round to int
destination_pos.z = math.floor(0.5 + destination_pos.z) -- round to int
destination_pos.y = nether.DEPTH_CEILING - 1000 -- temp value so find_nearest_working_portal() returns nether portals
destination_pos.y = nether.DEPTH_CEILING - 1 -- temp value so find_nearest_working_portal() returns nether portals
-- a y_factor of 0 makes the search ignore the altitude of the portals (as long as they are in the Nether)
local existing_portal_location, existing_portal_orientation =
@@ -188,7 +201,7 @@ The expedition parties have found no diamonds or gold, and after an experienced
local destination_pos = vector.multiply(realm_anchorPos, nether.FASTTRAVEL_FACTOR)
destination_pos.x = math.min(30900, math.max(-30900, destination_pos.x)) -- clip to world boundary
destination_pos.z = math.min(30900, math.max(-30900, destination_pos.z)) -- clip to world boundary
destination_pos.y = 0 -- temp value so find_nearest_working_portal() doesn't return nether portals
destination_pos.y = nether.DEPTH_CEILING + 1 -- temp value so find_nearest_working_portal() doesn't return nether portals
-- a y_factor of 0 makes the search ignore the altitude of the portals (as long as they are outside the Nether)
local existing_portal_location, existing_portal_orientation =
@@ -253,12 +266,12 @@ The expedition parties have found no diamonds or gold, and after an experienced
if pos.y <= nether.DEPTH_CEILING and pos.y >= nether.DEPTH_FLOOR then
result = "nether"
-- since mapgen_nobiomes.lua has no regions it doesn't implement getRegion(),
-- so only use getRegion() if it exists
if nether.mapgen.getRegion ~= nil then
-- since mapgen_nobiomes.lua has no regions it doesn't implement get_region(),
-- so only use get_region() if it exists
if nether.mapgen.get_region ~= nil then
-- the biomes-based mapgen supports 2 extra regions
local regions = nether.mapgen.RegionEnum
local region = nether.mapgen.getRegion(pos)
local region = nether.mapgen.get_region(pos)
if region == regions.CENTER or region == regions.CENTERSHELL then
result = "mantle"
elseif region == regions.NEGATIVE or region == regions.NEGATIVESHELL then