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80d12dbedb
* Add a simple PNG image encoder with Lua API Add ColorSpec to RGBA converter Make a safety wrapper for the encoder Create devtest examples Co-authored-by: hecktest <> Co-authored-by: sfan5 <sfan5@live.de>
143 lines
3.2 KiB
Lua
143 lines
3.2 KiB
Lua
-- Node texture tests
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local S = minetest.get_translator("testnodes")
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minetest.register_node("testnodes:6sides", {
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description = S("Six Textures Test Node"),
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tiles = {
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"testnodes_normal1.png",
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"testnodes_normal2.png",
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"testnodes_normal3.png",
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"testnodes_normal4.png",
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"testnodes_normal5.png",
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"testnodes_normal6.png",
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},
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groups = { dig_immediate = 2 },
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})
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minetest.register_node("testnodes:anim", {
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description = S("Animated Test Node"),
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tiles = {
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{ name = "testnodes_anim.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 4.0,
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}, },
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},
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groups = { dig_immediate = 2 },
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})
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-- Node texture transparency test
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local alphas = { 64, 128, 191 }
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for a=1,#alphas do
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local alpha = alphas[a]
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-- Transparency taken from texture
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minetest.register_node("testnodes:alpha_texture_"..alpha, {
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description = S("Texture Alpha Test Node (@1)", alpha),
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drawtype = "glasslike",
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paramtype = "light",
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tiles = {
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"testnodes_alpha"..alpha..".png",
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},
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use_texture_alpha = "blend",
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groups = { dig_immediate = 3 },
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})
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-- Transparency set via texture modifier
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minetest.register_node("testnodes:alpha_"..alpha, {
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description = S("Alpha Test Node (@1)", alpha),
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drawtype = "glasslike",
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paramtype = "light",
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tiles = {
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"testnodes_alpha.png^[opacity:" .. alpha,
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},
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use_texture_alpha = "blend",
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groups = { dig_immediate = 3 },
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})
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end
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-- Generate PNG textures
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local function mandelbrot(w, h, iterations)
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local r = {}
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for y=0, h-1 do
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for x=0, w-1 do
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local re = (x - w/2) * 4/w
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local im = (y - h/2) * 4/h
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-- zoom in on a nice view
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re = re / 128 - 0.23
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im = im / 128 - 0.82
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local px, py = 0, 0
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local i = 0
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while px*px + py*py <= 4 and i < iterations do
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px, py = px*px - py*py + re, 2 * px * py + im
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i = i + 1
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end
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r[w*y+x+1] = i / iterations
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end
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end
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return r
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end
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local function gen_checkers(w, h, tile)
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local r = {}
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for y=0, h-1 do
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for x=0, w-1 do
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local hori = math.floor(x / tile) % 2 == 0
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local vert = math.floor(y / tile) % 2 == 0
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r[w*y+x+1] = hori ~= vert and 1 or 0
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end
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end
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return r
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end
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local fractal = mandelbrot(512, 512, 128)
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local checker = gen_checkers(512, 512, 32)
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local floor = math.floor
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local abs = math.abs
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local data_mb = {}
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local data_ck = {}
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for i=1, #fractal do
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data_mb[i] = {
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r = floor(fractal[i] * 255),
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g = floor(abs(fractal[i] * 2 - 1) * 255),
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b = floor(abs(1 - fractal[i]) * 255),
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a = 255,
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}
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data_ck[i] = checker[i] > 0 and "#F80" or "#000"
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end
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local textures_path = minetest.get_modpath( minetest.get_current_modname() ) .. "/textures/"
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minetest.safe_file_write(
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textures_path .. "testnodes_generated_mb.png",
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minetest.encode_png(512,512,data_mb)
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)
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minetest.safe_file_write(
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textures_path .. "testnodes_generated_ck.png",
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minetest.encode_png(512,512,data_ck)
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)
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minetest.register_node("testnodes:generated_png_mb", {
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description = S("Generated Mandelbrot PNG Test Node"),
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tiles = { "testnodes_generated_mb.png" },
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groups = { dig_immediate = 2 },
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})
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minetest.register_node("testnodes:generated_png_ck", {
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description = S("Generated Checker PNG Test Node"),
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tiles = { "testnodes_generated_ck.png" },
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groups = { dig_immediate = 2 },
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})
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