prototype flotilla loader

vacuum_gambit.p8

@@ -466,6 +466,14 @@ end
 -->8
 --ship behavior
 
+-- generic full sprite hurtbox
+box8 = {
+ x_off = 0,
+ y_off = 1,
+ width = 8,
+ height = 8
+}
+
 scrollrate = 0.25 --in px/frame
 
 ship_m = mknew{
@@ -1347,7 +1355,6 @@ chasey = mknew(ship_m.new{
  end
 })
 
--- todo: use constraints
 function chasey:act()
  self.xmin = max(primary_ship.x-8, 0)
  self.xmax = min(primary_ship.x + 8, 112 - 8*self.size)
@@ -1385,6 +1392,53 @@ xl_chasey=mknew(chasey.new{
  end,
 })
 
+-- flotilla ships
+
+ship_f = mknew(ship_m.new{
+ -- sprite required
+ size = 1,
+ hurt = box8,
+ -- no sparks
+ hp = 0.5,
+ xp = 0x0.0001,
+
+ maxspd = 3,
+ thrust = 0.1,
+ drag = 0.05,
+ slip = false,
+ act = function(self)
+  local wx,wy=self.want_x,self.want_y
+  self.xmin,self.xmax,self.ymin,self.ymax = wx,wx,wy,wy
+  return 0,0,false,false
+ end,
+})
+
+ship_mook = mknew(ship_f.new{
+ sprite=103
+})
+ship_defender = mknew(ship_f.new{
+ sprite=105,
+ hp = 2.5,
+ xp = 0x0.0003,
+})
+ship_turret = mknew(ship_f.new{
+ sprite=106,
+ xp = 0x0.0002,
+})
+ship_skirmisher = mknew(ship_f.new{
+ sprite=107,
+ xp = 0x0.0004,
+ spark = smokespark,
+ sparkodds = 4,
+})
+
+function rnd_spawn_loc()
+ local x,y = flr(rnd(304)), flr(rnd(32))
+ if (x<184) return x-40,-y-8
+ if (x<244) return -y-8,x-184
+ return 112+y, x-244
+end
+
 -->8
 -- collisions
 
@@ -1449,6 +1503,108 @@ function collider:get_collisions(item)
  end
  return found
 end
+
+-->8
+-- flotillas
+
+-- a template for a wave, read
+-- from the map. each ship can
+-- alternate between "attack"
+-- and "formation" modes, like
+-- galaxian or galaga. ships
+-- with different roles have
+-- different rules for becoming
+-- aggressive, but aggression
+-- ramps up during the wave.
+
+-- flotilla placeholders are
+-- defined by sprite flags.
+-- see obsidian vault for
+-- full docs.
+
+flotilla = mknew{
+ use_var = 0x0001,
+ opt_odds = split"0.5,0.5,0.5,0.5",
+ init=function(this)
+  this.ship_bases={
+   [0]=mknew(ship_mook.new{ship_t=0}),
+   [1]=mknew(ship_mook.new{ship_t=1}),
+   [4]=mknew(ship_defender.new{ship_t=4}),
+   [5]=mknew(ship_defender.new{ship_t=5}),
+   [8]=mknew(ship_turret.new{ship_t=8}),
+   [9]=mknew(ship_turret.new{ship_t=9}),
+   [12]=mknew(ship_skirmisher.new{ship_t=12}),
+   [13]=mknew(ship_skirmisher.new{ship_t=13}),
+  }
+ end,
+}
+
+function flotilla:load(ulc_cx, ulc_cy, lvl)
+ local rows,cy,uv,counts={},ulc_cy,self.use_var+0xc840,{
+  [0]=0,
+  [1]=0,
+  [4]=0,
+  [5]=0,
+  [8]=0,
+  [9]=0,
+  [12]=0,
+  [13]=0,
+ }
+ repeat
+  local row,cx,opt,f = {},ulc_cx,{},0
+  for i,v in ipairs(self.opt_odds) do
+   opt[i*4-4]=rnd()<v
+  end
+  repeat
+   f=fget(mget(cx, cy))
+   -- bits 0x03: control mark or ship?
+   local mode = f&0x03
+   if mode==2 then
+    -- bits 0x0c: ship class
+    local ship_t = f&0x0c
+    -- bit 0x20: optional?
+    if f&0x20 == 0 or opt[ship_t] then
+     -- bit 0x10: alternate ship?
+     -- increment ship id if
+     -- alternate is requested
+     -- and we allow alternates
+     -- for this type of ship
+     ship_t+=(uv>>ship_t&0x1)&(f&0x10>>4)
+     add(row, self.ship_bases[ship_t]:new{column=cx-ulc_cx})
+    end
+   end
+  until mode==1
+  -- mode 1: end of line control mark
+  -- bits 0x18: what size flotilla is this row used for?
+  if (f&0x18)>>3 <= lvl then
+   -- keep the row; count it
+   for s in all(row) do
+    counts[s.ship_t] += 1
+   end
+   add(rows, row)
+  end
+  -- control mark bit 0x04: end of flotilla
+ until f&0x04 == 1
+ self.rows=rows
+ self:statisfy(counts)
+end
+
+function flotilla:statisfy(counts)
+ -- TODO: now that we know how
+ -- many ships of each kind
+ -- exist, build ships to match
+ -- difficulty target
+ --
+ -- no difficulty model is yet
+ -- implemented, though, so
+ -- just use base ships only
+ -- for this prototype
+end
+
+function flotilla:update()
+ -- TODO: assign new want_x, want_y to everyone who isn't dead
+end
+
 -->8
 -- level and event system
 
@@ -1653,6 +1809,18 @@ function multi(times, interval, fnm, ...)
  end}
 end
 
+function demo_spawn_f(ttn)
+ local spx,spy=rnd_spawn_loc()
+ local s = _ENV[ttn].new{
+  x = spx,
+  y = spy,
+  want_x = 8 + rnd(96),
+  want_y = 8 + rnd(64)
+ }
+ eships:push_back(s)
+ return s
+end
+
 -- then convert sample_level to csv.
 -- spawn_spec_gun_at and spawn_main_gun_at will need parsed forms.
 -- the boss also needs to be reachable, but one-off is fine.
@@ -1660,10 +1828,14 @@ end
 -- where offset,eol is a special case.
 
 example_level_csv=[[1,spawn_frownie
-60,spawn_vulcan_chasey
-61,spawn_blocky
-85,spawn_spewy
-115,spawn_spewy
+20,demo_spawn_f,ship_mook
+25,demo_spawn_f,ship_defender
+30,demo_spawn_f,ship_turret
+35,demo_spawn_f,ship_skirmisher
+80,spawn_vulcan_chasey
+81,spawn_blocky
+100,spawn_spewy
+125,spawn_spewy
 130,spawn_frownie
 145,spawn_frownie
 180,spawn_spewy
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