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55 lines
1.6 KiB
Common Lisp
55 lines
1.6 KiB
Common Lisp
;;-*-Lisp-*-
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(in-package goal)
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;; name: dynamics-h.gc
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;; name in dgo: dynamics-h
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;; dgos: GAME, ENGINE
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;; dyanamics contain gravity properties
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(deftype dynamics (basic)
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((name basic :offset-assert 4)
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(gravity-max meters :offset-assert 8)
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(gravity-length meters :offset-assert 12)
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(gravity vector :inline :offset-assert 16)
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(gravity-normal vector :inline :offset-assert 32)
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(walk-distance meters :offset-assert 48)
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(run-distance meters :offset-assert 52)
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)
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:method-count-assert 9
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:size-assert #x38
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:flag-assert #x900000038
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)
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(defun time-to-apex ((arg0 float) (arg1 float))
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"How many ticks it takes to reach the apex of a ballistic trajectory."
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(the int (/ arg0 (- (vel-tick arg1))))
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)
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(defun time-to-ground ((arg0 float) (arg1 float) (arg2 float))
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"How many ticks it takes to reach the ground for a ballistic trajectory."
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(let ((f0-0 0.0)
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(v0-0 0)
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)
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;; actually integrate forward, just like the game will do so we're exact.
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(while (< (- arg2) f0-0)
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(set! arg0 (- arg0 (* 0.0033333334 arg1)))
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(+! f0-0 (* 0.0033333334 arg0))
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(+! v0-0 1)
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)
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v0-0
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)
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)
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;; the default dynamics of the world.
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(define *standard-dynamics*
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(new 'static 'dynamics
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:name 'standard
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:gravity-max GRAVITY_MAX
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:gravity-length GRAVITY_AMOUNT
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:gravity (new 'static 'vector :x 0.0 :y GRAVITY_AMOUNT :z 0.0 :w 1.0)
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:gravity-normal (new 'static 'vector :x 0.0 :y 1.0 :z 0.0 :w 1.0)
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:walk-distance (meters 2)
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:run-distance (meters 5)
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)
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)
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