mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-06-30 08:54:55 +00:00
92 lines
3.2 KiB
Lua
92 lines
3.2 KiB
Lua
worldeditadditions.conv = {}
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dofile(worldeditadditions.modpath.."/lib/conv/kernels.lua")
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dofile(worldeditadditions.modpath.."/lib/conv/kernel_gaussian.lua")
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dofile(worldeditadditions.modpath.."/lib/conv/convolve.lua")
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--- Creates a new kernel.
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-- Note that the gaussian kernel only allows for creating a square kernel.
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-- arg is only used by the gaussian kernel as the sigma value (default: 2)
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-- @param name string The name of the kernel to create (possible values: box, pascal, gaussian).
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-- @param width number The width of the kernel to create (must be an odd integer).
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-- @param height number The height of the kernel to create (must be an odd integer).
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-- @param arg number The argument to pass when creating the kernel. Currently only used by gaussian kernel as the sigma value.
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function worldeditadditions.get_conv_kernel(name, width, height, arg)
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if width % 2 ~= 1 then
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return false, "Error: The width must be an odd integer.";
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end
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if height % 2 ~= 1 then
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return false, "Error: The height must be an odd integer";
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end
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if name == "box" then
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return true, worldeditadditions.conv.kernel_box(width, height)
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elseif name == "pascal" then
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return true, worldeditadditions.conv.kernel_pascal(width, height, true)
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elseif name == "gaussian" then
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if width ~= height then
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return false, "Error: When using a gaussian kernel the width and height must be identical."
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end
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-- Default to sigma = 2
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if arg == nil then arg = 2 end
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local success, result = worldeditadditions.conv.kernel_gaussian(width, arg)
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return success, result
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end
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return false, "Error: Unknown kernel. Valid values: box, pascal, gaussian"
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end
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function worldeditadditions.convolve(pos1, pos2, kernel, kernel_size)
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pos1, pos2 = worldedit.sort_pos(pos1, pos2)
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local manip, area = worldedit.manip_helpers.init(pos1, pos2)
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local data = manip:get_data()
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local stats = { added = 0, removed = 0 }
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local node_id_air = minetest.get_content_id("air")
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local heightmap = worldeditadditions.make_heightmap(pos1, pos2, manip, area, data)
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local heightmap_conv = worldeditadditions.shallowcopy(heightmap)
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local heightmap_size = {}
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heightmap_size[0] = pos2.z - pos1.z
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heightmap_size[1] = pos2.x - pos1.x
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worldeditadditions.conv.convolve(
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heightmap_conv,
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heightmap_size,
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kernel,
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kernel_size
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)
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for z = heightmap_size[0], 0, -1 do
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for x = heightmap_size[1], 0, -1 do
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local hi = z*heightmap_size[1] + x
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local diff = heightmap_conv[hi] - heightmap[hi]
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-- Lua doesn't have a continue statement :-/
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if diff ~= 0 then
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-- We subtract one because the heightmap starts at 1 (i.e. 1 = 1 node in the column), but the selected region is inclusive
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local node_id = data[area:index(pos1.x + x, pos1.y + (heightmap[hi] - 1), pos1.z + z)]
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if diff > 0 then
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stats.added = stats.added + diff
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for y = pos1.y + heightmap[hi], pos1.y + heightmap_conv[hi], 1 do
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data[area:index(pos1.x + x, y, pos1.z + z)] = node_id
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end
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else
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stats.removed = stats.removed + math.abs(diff)
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for y = pos1.y + heightmap_conv[hi], pos1.y + heightmap[hi], 1 do
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data[area:index(pos1.x + x, y, pos1.z + z)] = node_id_air
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end
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end
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end
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end
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end
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worldedit.manip_helpers.finish(manip, data)
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return true, stats
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end
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