jak-project/goal_src/jak1/engine/physics/dynamics-h.gc
ManDude cd68cb671e
deftype and defmethod syntax major changes (#3094)
Major change to how `deftype` shows up in our code:
- the decompiler will no longer emit the `offset-assert`,
`method-count-assert`, `size-assert` and `flag-assert` parameters. There
are extremely few cases where having this in the decompiled code is
helpful, as the types there come from `all-types` which already has
those parameters. This also doesn't break type consistency because:
  - the asserts aren't compared.
- the first step of the test uses `all-types`, which has the asserts,
which will throw an error if they're bad.
- the decompiler won't emit the `heap-base` parameter unless necessary
now.
- the decompiler will try its hardest to turn a fixed-offset field into
an `overlay-at` field. It falls back to the old offset if all else
fails.
- `overlay-at` now supports field "dereferencing" to specify the offset
that's within a field that's a structure, e.g.:
```lisp
(deftype foobar (structure)
  ((vec    vector  :inline)
   (flags  int32   :overlay-at (-> vec w))
   )
  )
```
in this structure, the offset of `flags` will be 12 because that is the
final offset of `vec`'s `w` field within this structure.
- **removed ID from all method declarations.** IDs are only ever
automatically assigned now. Fixes #3068.
- added an `:overlay` parameter to method declarations, in order to
declare a new method that goes on top of a previously-defined method.
Syntax is `:overlay <method-name>`. Please do not ever use this.
- added `state-methods` list parameter. This lets you quickly specify a
list of states to be put in the method table. Same syntax as the
`states` list parameter. The decompiler will try to put as many states
in this as it can without messing with the method ID order.

Also changes `defmethod` to make the first type definition (before the
arguments) optional. The type can now be inferred from the first
argument. Fixes #3093.

---------

Co-authored-by: Hat Kid <6624576+Hat-Kid@users.noreply.github.com>
2023-10-30 03:20:02 +00:00

55 lines
1.4 KiB
Common Lisp

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