Underflow issue?

[phmarek]

Playing around a bit (and giving myself more powerups ;) I got this:

The value 32791 is not of type (SIGNED-BYTE 16).
   [Condition of type TYPE-ERROR]

Restarts:
  0: [RETRY] Retry SLIME REPL evaluation request.
  1: [*ABORT] Return to SLIME's top level.
  2: [ABORT] Abort thread (#<THREAD "repl-thread" RUNNING {10076B3693}>)

Backtrace:
  0: (LISPBUILDER-SDL::GFX-DRAW-CIRCLE-* 32791 21087 3 :SURFACE NIL :COLOR #<COLOR {1004DD6703}> :AA NIL)
  1: (DRAW-CIRCLE-* 32791 21087 3 :SURFACE NIL :COLOR #<COLOR {1004DD6703}> :ALPHA NIL :AA NIL :GFX-LOADED-P T)
  2: (DRAW-CIRCLE #(32791 21087) 3 :SURFACE NIL :COLOR #<COLOR {1004DD6703}> :ALPHA NIL :AA NIL :GFX-LOADED-P NIL)
  3: ((SB-PCL::FAST-METHOD RENDER (BULLET)) #<unused argument> #<unused argument> #<BULLET {100A958313}>)
  4: ((SB-PCL::FAST-METHOD RENDER-WORLD (WORLD T)) #<unused argument> #<unused argument> #<WORLD {1008C590E3}> NIL)
  5: ((LAMBDA () :IN MAIN))
  6: ((SB-PCL::FAST-METHOD LISPBUILDER-SDL::PROCESS-TIMESTEP (LISPBUILDER-SDL::FPS-MANAGER T)) #<unused argument> #<unused argument> #<unused argume
  7: ((SB-PCL::EMF LISPBUILDER-SDL::PROCESS-TIMESTEP) #<unused argument> #<unused argument> #<FPS-FIXED {1008C4C383}> #<CLOSURE (LAMBDA # :IN MAIN)
  8: ((SB-PCL::FAST-METHOD LISPBUILDER-SDL::PROCESS-TIMESTEP :AROUND (LISPBUILDER-SDL::FPS-MANAGER T)) ..)
  9: (MAIN)

I thought you might be interested.

[andyhd]

Thanks for your interest! I'll take a look.

[andyhd]

A bullet with those coordinates should be removed from the world in the update bullet method, so I'm not sure what happened. The render method should be more defensive and check the coordinates, probably.

What sort of playing around did you do?

[phmarek]

(defparameter *powerup-max-age* 999)

and, in break-down,

      (if t #+nil (< (random 100) (/ 100 (+ 4 (* (level world) 0.3))))

Then I flew around a bit - shooting and fetching.

[andyhd]

Hehe. I've reproduced the bug myself, now. I'll add a check before rendering.

[phmarek]

Oh, and BTW - as a VIM user, be sure to look at slimv (http://www.vim.org/scripts/script.php?script_id=2531) - uses python to connect vim to a swank server.

I got it running with swankR, too ... ;)