--external functions--
function dns(sp)
    spr(sp.sp,sp.x,sp.y,sp.w/8,sp.h/8,sp.flp)
end

function player_update()
    --physics
    player.dy+=gravity
    player.dx*=friction

    --running
    if btn(⬅️) then
        player.dx-=player.acc
        player.running=true
        player.flp=true
    end
    if btn(➡️) then
        player.dx+=player.acc
        player.running=true
    end

    --jumping
    if btnp(🅾️) and player.landed then
        player.dy-=boost
        player.landed=false
    end

    --collision on y axis
    if player.dy>0 then
        player.falling=true
        player.landed=false
        player.jumping=false

        if collide_map(player,"down",0) then
            player.landed=true
            player.falling=false
            player.dy=0
            player.y-=(player.y+player.h)%8
        end
    elseif player.dy<0 then
        player.jumping=true

        if collide_map(player,"up",0) then
            player.dy=0
        end
    end

    --collision on x axis
    if player.dx<0 then
        if collide_map(player,"left",0) then
            player.dx=0
        end
    elseif player.dx>0 then
        if collide_map(player,"right",0) then
            player.dx=0
        end
    end

    player.x+=player.dx
    player.y+=player.dy
end
--function player_animate()
--end