--- @class Render
--- @field shadowLayer love.Canvas
--- @field spriteLayer love.Canvas
--- @field floorLayer love.Canvas
--- @field overlayLayer love.Canvas
local render = {}
render.__index = render

function render:clear()
    love.graphics.setCanvas(self.shadowLayer)
    love.graphics.clear(1, 1, 1, 0)
    love.graphics.setCanvas(self.spriteLayer)
    love.graphics.clear()
    love.graphics.setCanvas(self.floorLayer)
    love.graphics.clear()
    love.graphics.setCanvas(self.overlayLayer)
    love.graphics.clear()
end

function render:draw()
    -- пол -> тени -> спрайты -> оверлей
    love.graphics.draw(self.floorLayer)
    love.graphics.setBlendMode("multiply", "premultiplied")
    love.graphics.draw(self.shadowLayer)
    love.graphics.setBlendMode("alpha")
    love.graphics.draw(self.spriteLayer)
    love.graphics.draw(self.overlayLayer)
end

local function new()
    return setmetatable({
        shadowLayer = love.graphics.newCanvas(1280, 720),
        spriteLayer = love.graphics.newCanvas(1280, 720),
        floorLayer = love.graphics.newCanvas(1280, 720),
        overlayLayer = love.graphics.newCanvas(1280, 720),
    }, render)
end

return { new = new }