local tex = love.graphics.newImage("circle.png")
tex:setFilter("nearest", "nearest")

local function dirt_color(layer)
	if layer < 18 then
		return layer / 26 / 2.5, layer / 52 / 2.5, 0.1
	else
		return 0.05, (layer - 18) / 10 + 0.3, 0.05
	end
end

local function mountain_color(layer)
	if layer < 29 then
		local value = layer / 32 / 2.5
		return value, value, value
	else
		local value = (layer - 29) / 10 + 0.7
		return value, value, value
	end
end

local BIG_BLOCK = love.graphics.newQuad(0, 0, 8, 8, tex)

local z = require("zprite").zchunk.new(tex, 128, 32)
z._height_scale = 8

local function update_map()
	z:clear()
	for i = -64, 64 do
		for j = -64, 64 do
			local layers = love.math.simplexNoise(i * 0.02, j * 0.02) * 29 + 3
			z:put(i * 8, j * 8, BIG_BLOCK, math.floor(layers) + 1, layers < 23 and dirt_color or mountain_color)
			coroutine.yield()
		end
	end
end
local co = coroutine.create(update_map)

local angle = 0

function love.update(dt)
	for _ = 1, 4 do
		if coroutine.status(co) == "suspended" then
			coroutine.resume(co)
		end
	end
	angle = math.fmod(angle + dt * 0.8, 2 * math.pi)
end

function love.draw()
	z:draw(love.graphics.getWidth() / 2, love.graphics.getHeight() / 2 + 128, angle, 1, 1)
end