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generated by cgit v1.2.3 (git 2.39.1) at 2025-02-24 21:05:49 +0000
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-- Node texture tests

local S = minetest.get_translator("testnodes")

minetest.register_node("testnodes:6sides", {
	description = S("Six Textures Test Node"),
	tiles = {
		"testnodes_normal1.png",
		"testnodes_normal2.png",
		"testnodes_normal3.png",
		"testnodes_normal4.png",
		"testnodes_normal5.png",
		"testnodes_normal6.png",
	},

	groups = { dig_immediate = 2 },
})

minetest.register_node("testnodes:anim", {
	description = S("Animated Test Node"),
	tiles = {
		{ name = "testnodes_anim.png",
		animation = {
			type = "vertical_frames",
			aspect_w = 16,
			aspect_h = 16,
			length = 4.0,
		}, },
	},

	groups = { dig_immediate = 2 },
})

-- Node texture transparency test

local alphas = { 64, 128, 191 }

for a=1,#alphas do
	local alpha = alphas[a]

	-- Transparency taken from texture
	minetest.register_node("testnodes:alpha_texture_"..alpha, {
		description = S("Texture Alpha Test Node (@1)", alpha),
		drawtype = "glasslike",
		paramtype = "light",
		tiles = {
			"testnodes_alpha"..alpha..".png",
		},
		use_texture_alpha = "blend",

		groups = { dig_immediate = 3 },
	})

	-- Transparency set via texture modifier
	minetest.register_node("testnodes:alpha_"..alpha, {
		description = S("Alpha Test Node (@1)", alpha),
		drawtype = "glasslike",
		paramtype = "light",
		tiles = {
			"testnodes_alpha.png^[opacity:" .. alpha,
		},
		use_texture_alpha = "blend",

		groups = { dig_immediate = 3 },
	})
end

-- Generate PNG textures

local function mandelbrot(w, h, iterations)
	local r = {}
	for y=0, h-1 do
		for x=0, w-1 do
			local re = (x - w/2) * 4/w
			local im = (y - h/2) * 4/h
			-- zoom in on a nice view
			re = re / 128 - 0.23
			im = im / 128 - 0.82

			local px, py = 0, 0
			local i = 0
			while px*px + py*py <= 4 and i < iterations do
				px, py = px*px - py*py + re, 2 * px * py + im
				i = i + 1
			end
			r[w*y+x+1] = i / iterations
		end
	end
	return r
end

local function gen_checkers(w, h, tile)
	local r = {}
	for y=0, h-1 do
		for x=0, w-1 do
			local hori = math.floor(x / tile) % 2 == 0
			local vert = math.floor(y / tile) % 2 == 0
			r[w*y+x+1] = hori ~= vert and 1 or 0
		end
	end
	return r
end

local fractal = mandelbrot(512, 512, 128)
local frac_emb = mandelbrot(64, 64, 64)
local checker = gen_checkers(512, 512, 32)

local floor = math.floor
local abs = math.abs