adjust menu renderer

not enough room to describe "fractions add up" -- maybe I can just fit
in the "remainder" to hint that it will be considered in future
upgrades?

vacuum_gambit.p8

@@ -676,7 +676,13 @@ bullet_base = mknew{ }
 
 gun_base = mknew{ 
  shoot_ready = -32768,
- icon = 20
+ icon = 20,
+ ammobonus = 1,
+
+ -- fractional frames of
+ -- cooldown reduction from
+ -- upgrades, not yet applied
+ cd_remainder = 0,
 }
 
 -- gun_base subtypes are
@@ -707,6 +713,68 @@ function gun_base:actually_shoot(x, y)
  self.munition.new{}:spawn_at(x, y)
 end
 
+-- upgrade 
+function gun_base:small_upgrade_opts()
+ local ret = {
+  self:ammo_upgrade_opt(),
+  self:rate_upgrade_opt(),
+ }
+ local s = self.special_upgrade_opt
+ if (s) add(ret, s(self))
+ return ret
+end
+
+function gun_base:ammo_upgrade_opt()
+ local a=self.maxammo
+ local x=a\10+self.ammobonus
+ return {
+  icon=self.icon,
+  hdr=self.hdr,
+  body=[[--------AMMO
+
+ more shots
+ before you
+  run out.
+
+   is: ]]..tostr(a)..[[ 
+  add: ]]..tostr(x)..[[ 
+----------
+total: ]]..tostr(a+x),
+  action=function()
+   self.maxammo+=x
+   self.ammo+=x
+  end,
+ }
+end
+
+function gun_base:rate_upgrade_opt()
+ local c=self.cooldown<<16
+ local rawnewc=0.85*(c-self.cd_remainder)
+ local newc=ceil(rawnewc)
+ return {
+  icon=self.icon,
+  hdr=self.hdr,
+  body=[[--------RATE
+
+reduce delay
+between each
+ shot when
+  firing.
+
+   is: ]]..tostr(c)..[[f
+minus: ]]..tostr(c-newc)..[[f
+----------
+total: ]]..tostr(newc)..[[f
+
+remainder:
+  ]]..sub(tostr(newc-rawnewc),0,5),
+  action=function()
+   self.cooldown=newc>>16
+   self.cd_remainder=newc-rawnewc
+  end,
+ }
+end
+
 function bullet_base:hitship(_)
  self:die()
  return true
@@ -848,10 +916,12 @@ blast_gun = mknew(gun_base.new{
  maxammo = 5,
  munition = blast,
  hdr = "bLASTER",
- body= [[plasma orb
+ body= [[---------GUN
+
+ plasma orb
 cuts through
-enemies.
-slow.
+  enemies.
+   slow.
 
 ammo: 5
 rate: 1/2sec
@@ -920,9 +990,11 @@ protron_gun_p = mknew(protron_gun_e.new{
  maxammo = 20,
  cooldown = 0x0.0018,
  hdr = "pROTRON",
- body = [[spray shots
-in a dense
-arc.
+ body = [[---------GUN
+
+ spray shots
+ in a dense
+    arc.
 
 ammo: 20
 rate: 2/sec
@@ -981,9 +1053,10 @@ vulcan_gun_p = mknew(vulcan_gun_e.new{
  munition=vulcan_p,
  maxammo = 100,
  hdr = "vULCAN",
- body = [[rapid fire
-in a v
-shape.
+ body = [[---------GUN
+
+rapidly fire
+  in a v.
 
 ammo: 100
 rate: 20/sec
@@ -1074,7 +1147,11 @@ function player:small_upgrade_opts()
  local ret = {{
   icon=53,
   hdr="hull",
-  body=[[    armor
+  body=[[--------SHIP
+
+survive more
+ unshielded
+    hits.
 
     +2 hp]],
   action=function()
@@ -1083,8 +1160,13 @@ function player:small_upgrade_opts()
   end,
  },{
   icon=52,
-  hdr="shield",
-  body=[[  capacity
+  hdr="capacity",
+  body=[[------SHIELD
+
+shield can
+absorb more
+hits before
+recharging.
 
     +1 hp]],
   action=function()
@@ -1094,10 +1176,11 @@ function player:small_upgrade_opts()
  },{
   icon=1,
   hdr="thrusters",
-  body=[[performance
- 
+  body=[[--------SHIP
+
 move faster,
-steer faster]],
+ steer more
+  sharply.]],
  action=function()
   --maxspd thrust drag
   self.maxspd += 0.5
@@ -1106,22 +1189,29 @@ steer faster]],
  end,
  },{
   icon=20,
-  hdr="hull",
-  body=[[   magnet
-  
+  hdr="magnet",
+  body=[[--------SHIP
+
  pick up xp
 from further
-   away]],
+   away.]],
   action=function ()
    self.magnet += 2
   end,
- }}
+ },
+ self.main_gun:rate_upgrade_opt(),
+}
 
  if cdr > 0 then
   add(ret, {
    icon = 6,
-   hdr = "shield",
-   body=[[charge rate
+   hdr = "recharge",
+   body=[[------SHIELD
+
+shield will
+recharge at
+ a faster
+   pace.
  
   ]] .. tostr(ceil(100 * cdr / self.shieldcooldown)) .. "% faster",
    action = function()
@@ -1133,8 +1223,15 @@ from further
  if pr > 0 then
   add(ret, {
    icon = 6,
-   hdr = "shield",
-   body=[[disruption
+   hdr = "recovery",
+   body=[[------SHIELD
+
+ reduce the
+delay after
+a hit before
+shield will
+ start to
+ recharge.
  
  ]] .. tostr(ceil(100 * pr / self.shieldpenalty)) .. "% shorter",
    action = function()
@@ -1795,7 +1892,12 @@ end
 -- ordinary upgrades
 function small_opts()
  -- todo: include gun opts
- return pick(primary_ship:small_upgrade_opts(), 2)
+ if(not primary_ship.special_guns) return pick(primary_ship:small_upgrade_opts(), 2)
+ local opts = {rnd(primary_ship:small_upgrade_opts())}
+ for g in all(primary_ship.special_guns) do
+  add(opts, rnd(g:small_upgrade_opts()))
+ end
+ return pick(opts, 2)
 end
 
 -->8
@@ -1804,7 +1906,7 @@ end
 rearm_mode = mknew{
  sel=1,
  bfm=1,
- crt_frm = 1,
+ crt_frm = 0,
  pos=-1,
  init=function(this)
   poke(0x5f5c, 255) --no btnp repeat
@@ -1819,7 +1921,7 @@ function rearm_mode:glow_box(x0, y0, x1, y1, c, cf)
   i -= 1
   rect(x0+i,y0+i,x1-i,y1-i,v)
  end
- fillp(crt[self.crt_frm&0xff])
+ fillp(crt[1+(self.crt_frm&7)])
  rectfill(x0+4, y0+4, x1-4, y1-4, cf)
  fillp()
 end
@@ -1851,7 +1953,7 @@ end
 
 function rearm_mode:draw_option(id)
  local rec = self.options[id]
- self:glow_box(0,0,55,100,self:frame_col(self.sel == id),1)
+ self:glow_box(0,0,55,101,self:frame_col(self.sel == id),1)
  spr(rec.icon,5, 5)
  print(rec.hdr, 13, 8, 7)
  print(rec.body, 5, 15, 6)
@@ -1887,9 +1989,9 @@ function rearm_mode:draw()
  camera(frac * -128 + (1-frac) * -56, 0)
  self:draw_option(2)
  camera(0, -28 * frac)
- self:glow_box(0,101,111,127,self:frame_col(self.sel < 0),1)
+ self:glow_box(0,102,111,127,self:frame_col(self.sel < 0),1)
  spr(96,15,107,4,2)
- print("full ammo\nfull shield\n+50% health",54, 106, 6)
+ print("full ammo\nfull shield\n+50% health",54, 107, 6)
 end
 
 function rearm_mode:update_pos()
@@ -1909,6 +2011,7 @@ function rearm_mode:update_pos()
 end
 
 function rearm_mode:update()
+ self.crt_frm+=0.25
  self:update_pos()
  if self.pos > 1 then
   mode = game_mode