back out of fast bullet changes, keep optimizations

in the "nothing but turrets" worst-case scenario, fast bullet logic costs 133% of slow bullet logic even when almost all shots on screen are slow. when I back out of this, that scenario is _still_ over 300% CPU but at least it's not 400%. note that this is with a screen mostly full of enemies, so processing all of them and their potential collisions also has cost, so the actual bullet-specific change is closer to 150%, maybe 200%. this is genuinely not as bad as I had thought but it doesn't feel like it will be workable; while my worst-case scenario is implausibly bad it's not actually 3x-likely-peak bad. so I'm going to need to find more optimizations, and probably give up on fast bullets. But I can keep the fast bullet branch around in case I find the headroom to reintroduce it later.

vacuum_gambit.p8

@@ -257,30 +257,21 @@ function updategame()
    if(es:hitship(ps)) eship_collider:yoink(es)
   end
   ebullets:strip(function(eb)
-   local disposition
-   repeat
-    disposition=eb:step()
-    if collides(pbox, hurtbox(eb)) then
+   if (eb:move()) return true
+   if (not collides(pbox, hurtbox(eb))) return
    ps:hitbullet(eb)
-     if (eb:hitship(ps)) return true
-    end
-   until disposition
-   return disposition == "dead"
+   return eb:hitship(ps)
   end)
  else
-  ebullets:strip(function(eb) repeat until eb:step() end)
+  ebullets:stripmove()
  end
 
  pbullets:strip(function(pb)
-  local disposition
-  repeat
-   disposition=pb:step()
+  if (pb:move()) return true
   for es in eship_collider:iterate_collisions(hurtbox(pb)) do
    if (es:hitbullet(pb)) eship_collider:yoink(es)
    if (pb:hitship(es)) return true
   end
-  until disposition
-  return disposition == "dead"
  end)
  
  intangibles_fg:stripmove()
@@ -700,10 +691,7 @@ end
 --   default: die, return true.
 --   returns whether to delete
 --   the bullet
-bullet_base = mknew{
- steps=1,
- current_step=0
-}
+bullet_base = mknew{}
 
 gun_base = mknew{ 
  shoot_ready = -32768,
@@ -829,29 +817,15 @@ function bullet_base:hitship(_)
  return true
 end
 
-function bullet_base:step()
- self.current_step=(self.current_step+1)%self.steps
+function bullet_base:move()
  self.x += self.dx
  self.y += self.dy
  if (self.f) self.f -= 1
- if ((self.y > 130) or (self.y < -self.height*8) or (self.f and self.f < 0) or (self.x > 128) or (self.x < -self.width*8)) return "dead"
- if (self.current_step == 0) return "stop"
+ return (self.y > 130) or (self.y < -self.height*8) or (self.f and self.f < 0) or (self.x > 128) or (self.x < -self.width*8)
 end
 
-warmpal = {
- [0]=0,1,2,1,2,1,5,10,2,4,9,3,13,5,8,9
-}
-
 function bullet_base:draw()
- local s,bx,by,dx,dy,w,h,st = self.sprite,self.x,self.y,self.dx,self.dy,self.width,self.height,self.steps
- if st > 1 then
-  pal(warmpal)
-   for n=st-1,1,-1 do
-    spr(s, bx-n*dx, by-n*dy, w, h)
-   end
-  pal()
- end
- spr(s, bx, by, w, h)
+ spr(self.sprite, self.x, self.y, self.width, self.height)
 end
 
 function bullet_base:spawn_at(x, y)
@@ -919,16 +893,15 @@ zap_p = mknew(bullet_base.new{
  --shape
  sprite = 8, --index of ammo sprite
  width = 0.25, --in 8x8 blocks
- height = 0.25,
+ height = 1,
  hurt = { -- hurtbox - where this ship can be hit
   x_off = 0, -- upper left corner
   y_off = 0, -- relative to sprite
   width = 2,
-  height = 2,
+  height = 8,
  },
  x_off = 1, -- how to position by ship
  y_off = 0,
- steps=4,
  damage = 1,
 
  hitship = const_fxn(true),
@@ -939,7 +912,7 @@ zap_p = mknew(bullet_base.new{
 zap_gun_p = mknew(gun_base.new{
  icon = 19,
  cooldown = 0x0.0020, -- frames between shots
- veloc = 2,
+ veloc = 7,
  aim = 0.25,
  munition = zap_p,
  hdr = "mAIN gUN",
@@ -2032,14 +2005,14 @@ function rearm_mode:update()
 end
 
 __gfx__
-00000000000650000000000000000000bb0b50b59909209200cc0c00000000007b00000082000000e00e8002e00e800200333300002222000000000000000000
-00000000006765000000000000cccc00b50b3055920940220c0000c000bbbb00bb000000a2000000e0e8880240e8480403bbbb30028888200000000000000000
-00700700006d6500000000000cddddd00b33335009444420c00c000c0b33333000000000a8000000e88e2882e48e24823bbaabb3288aa8820000000000000000
-00077000067c665000000000cdd10cd10b3dd350094dd42000c0000cb3350b3500000000a8000000e88e2882484e24423ba77ab328a77a820000000000000000
-00077000067d665000000000cd10cdd100b3350000944200c0000000b350b33500000000a8000000e88e2882e84e28823ba77ab328a77a820000000000000000
-0070070065666765000000000ddddd100b33355009444220c000000c0333335000000000a800000008888820048488203bbaabb3288aa8820000000000000000
-000000006506506500000000001111000b0b5050090920200c0000c00055550000000000a2000000008882000048420003bbbb30028888200000000000000000
-00000000650000650000000000000000000b50000009200000c0cc00000000000000000082000000000820000008200000333300002222000000000000000000
+00000000000650000000000000000000bb0b50b59909209200cc0c00000000003b00000082000000e00e8002e00e800200333300002222000000000000000000
+00000000006765000000000000cccc00b50b3055920940220c0000c000bbbb0037000000a2000000e0e8880240e8480403bbbb30028888200000000000000000
+00700700006d6500000000000cddddd00b33335009444420c00c000c0b333330b7000000a8000000e88e2882e48e24823bbaabb3288aa8820000000000000000
+00077000067c665000000000cdd10cd10b3dd350094dd42000c0000cb3350b35b7000000a8000000e88e2882484e24423ba77ab328a77a820000000000000000
+00077000067d665000000000cd10cdd100b3350000944200c0000000b350b335b7000000a8000000e88e2882e84e28823ba77ab328a77a820000000000000000
+0070070065666765000000000ddddd100b33355009444220c000000c03333350b7000000a800000008888820048488203bbaabb3288aa8820000000000000000
+000000006506506500000000001111000b0b5050090920200c0000c000555500b7000000a2000000008882000048420003bbbb30028888200000000000000000
+00000000650000650000000000000000000b50000009200000c0cc0000000000b700000082000000000820000008200000333300002222000000000000000000
 0000000000065000000650000003b0000070070080000000700000000bb0000008800000000000000009200000000000cccccccd000650000000000000000000
 000000000067500000076500000370000005500080000000b0000000b76300008a920000000000009009200200000000c111111d006765000000000000000000
 00000000006d6500006d6500000b7000700660079000000030000000b663000089920000000550009994444200000000c111111d006d65000000000000000000