-- Large falling tetrominoes
local gc=love.graphics
local gc_clear=gc.clear
local gc_setColor,gc_draw=gc.setColor,gc.draw

local rnd=math.random
local ins,rem=table.insert,table.remove
local back={}

local t
local mino
function back.init()
    t=0
    mino={}
end
function back.update()
    t=t+1
    if t%26==0 then
        local r=rnd(7)
        local B=BLOCKS[r][rnd(0,3)]
        local k=(1+rnd()*2)*SCR.rad/1000
        ins(mino,{
            x=(SCR.w)*rnd()-15*#B[1],
            y=0,
            k=k,
            vy=k*2,
            block=B,
            texture=SKIN.lib[SETTING.skinSet][SETTING.skin[r]],
        })
    end
    for i=#mino,1,-1 do
        local M=mino[i]
        M.y=M.y+M.vy
        if M.y-M.k*#M.block*30>SCR.h then
            rem(mino,i)
        end
    end
end
function back.draw()
    gc_clear(.1,.1,.1)
    gc_setColor(1,1,1,.2)
    for i=1,#mino do
        local M=mino[i]
        local b=M.block
        for y=1,#b do
            for x=1,#b[1] do
                if b[y][x] then
                    gc_draw(M.texture,M.x+(x-1)*30*M.k,M.y-y*30*M.k,nil,M.k)
                end
            end
        end
    end
end
function back.discard()
    mino=nil
end
return back