94 lines
2.7 KiB
Lua
94 lines
2.7 KiB
Lua
--[[
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The following nodes are monochrome checkerboard nodes.
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Their textures have odd sizes that are sometimes used,
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e.g. in texture packs that use other sizes than 16×16.
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Those nodes are useful to see how textures are scaled:
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You may be able to find rendering bugs with the nodes,
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e.g. artifacts when scaling non-power-of-two textures.
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The choice of uncompressed monochrome TGAs is for debugging –
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it is easy to understand the generated images with a hexdump.
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(If you have never done that, it is not your place to judge.)
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]]--
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local modname = minetest.get_current_modname()
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local S = minetest.get_translator( modname )
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local textures_path = minetest.get_modpath( modname ) .. "/textures/"
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function encode_tga_type_3(w, h, ...)
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assert((w <= 256) and (h <= 256) and (w * h == #{...}))
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local bytes = string.char
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local header = bytes(0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, w, 0, h, 0, 8, 0)
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local footer = bytes(0, 0, 0, 0, 0, 0, 0, 0) .. "TRUEVISION-XFILE." .. bytes(0)
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return(header .. bytes(...) .. footer)
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end
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function generate_checkerboard(width, height, wtile, htile)
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local pixels = {}
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for h = 1,height do
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for w = 1,width do
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local hori = math.floor((w - 1) / wtile) % 2 == 0
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local vert = math.floor((h - 1) / htile) % 2 == 0
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-- off-white & off-black to stand out in hexdump
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local color = hori ~= vert and 0xEE or 0x11
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if (
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0 == math.floor((w - 1) / wtile) and
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0 == math.floor((h - 1) / htile)
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) then
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color = "0x7F"
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end
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pixels[#pixels + 1] = color
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end
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end
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return pixels
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end
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function generate_checkerboard_node(width, height, wtiles, htiles)
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local id = "cb_bw_" ..
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wtiles .. "x" .. htiles .. "_" ..
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width .. "x" .. height
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local filename = id .. ".tga"
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local pixels = generate_checkerboard(
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width, height,
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math.floor(width/wtiles), math.floor(height/htiles)
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)
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minetest.safe_file_write(
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textures_path .. filename,
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encode_tga_type_3(width, height, unpack(pixels))
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)
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local nodename = modname .. ":" .. id
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minetest.register_node(nodename, {
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description = S(
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"Checkerboard Test Node " ..
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"(Tiling: " .. wtiles .. "×" .. htiles .. ") " ..
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width .. "×" .. height ..
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"\nNodes with same tiling should look alike."
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),
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groups = { dig_immediate = 2 },
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tiles = { filename },
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})
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end
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-- multiples of 2
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for i = 2,16,2 do generate_checkerboard_node(i, i, 2, 2) end
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-- multiples of 3
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for i = 3,9,3 do generate_checkerboard_node(i, i, 3, 3) end
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-- multiples of 4
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for i = 4,16,4 do generate_checkerboard_node(i, i, 4, 4) end
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-- multiples of 5
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for i = 5,15,5 do generate_checkerboard_node(i, i, 5, 5) end
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-- multiples of 7
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for i = 7,21,7 do generate_checkerboard_node(i, i, 7, 7) end
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-- multiples of 16
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for i = 16,64,16 do generate_checkerboard_node(i, i, 16, 16) end
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