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Got the physics system applying gravity and drag correctly. (Mostly? Seems like it? Seems good.)

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This commit is contained in:
Andrew Kesterson
2026-05-26 11:22:45 -04:00
parent 314ce5e10d
commit 941eeb2493
6 changed files with 148 additions and 75 deletions
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26
include/akgl/actor.h
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@@ -71,9 +71,31 @@ typedef struct akgl_Actor {
void *actorData;
bool visible;
SDL_Time movetimer;
// Velocity. Combined effect of all forces acting on the actor resulting
// in energy along an axis.
float32_t vx;
float32_t vy;
float32_t vz;
// Environmental velocity. These are the forces acting on the actor by the
// environment (such as gravity and atmospheric drag)
float32_t ex;
float32_t ey;
float32_t ez;
// Thrust. Energy originating only from the actor's own acceleration on a
// given axis, before the effects of gravity and drag.
float32_t tx;
float32_t ty;
float32_t tz;
// Acceleration. These are borrowed from the base character object.
// A given axis resets to 0 when the actor stops moving in a given axis.
float32_t ax;
float32_t ay;
float32_t az;
// Max speed. These are borrowed from the base character object.
float32_t sx;
float32_t sy;
float32_t sz;
// Position.
float32_t x;
float32_t y;
float32_t z;
@@ -83,7 +105,7 @@ typedef struct akgl_Actor {
akerr_ErrorContext AKERR_NOIGNORE *(*updatefunc)(struct akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *(*renderfunc)(struct akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *(*facefunc)(struct akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *(*movementlogicfunc)(struct akgl_Actor *obj, SDL_Time curtimems);
akerr_ErrorContext AKERR_NOIGNORE *(*movementlogicfunc)(struct akgl_Actor *obj, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *(*changeframefunc)(struct akgl_Actor *obj, akgl_Sprite *curSprite, SDL_Time curtimems);
akerr_ErrorContext AKERR_NOIGNORE *(*addchild)(struct akgl_Actor *obj, struct akgl_Actor *child);
} akgl_Actor;
@@ -92,7 +114,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_initialize(akgl_Actor *obj, char *
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_set_character(akgl_Actor *obj, char *basecharname);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_render(akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_update(akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_logic_movement(akgl_Actor *obj, SDL_Time curtimems);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_logic_movement(akgl_Actor *obj, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_logic_changeframe(akgl_Actor *obj, akgl_Sprite *curSprite, SDL_Time curtimems);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_automatic_face(akgl_Actor *obj);
akerr_ErrorContext AKERR_NOIGNORE *akgl_actor_add_child(akgl_Actor *obj, akgl_Actor *child);