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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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2
include/akgl/SDL_GameControllerDB.h
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@@ -1,7 +1,7 @@
#ifndef _SDL_GAMECONTROLLERDB_H_
#define _SDL_GAMECONTROLLERDB_H_
// Taken from https://raw.githubusercontent.com/mdqinc/SDL_GameControllerDB/refs/heads/master/gamecontrollerdb.txt on Tue May 26 10:27:58 AM EDT 2026
// Taken from https://raw.githubusercontent.com/mdqinc/SDL_GameControllerDB/refs/heads/master/gamecontrollerdb.txt on Tue May 26 04:12:10 PM EDT 2026
#define AKGL_SDL_GAMECONTROLLER_DB_LEN 2228

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);

12
include/akgl/physics.h
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@@ -8,9 +8,9 @@
typedef struct akgl_PhysicsBackend {
akerr_ErrorContext AKERR_NOIGNORE *(*simulate)(struct akgl_PhysicsBackend *self, akgl_Iterator *opflags);
akerr_ErrorContext AKERR_NOIGNORE *(*gravity)(struct akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *(*gravity)(struct akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *(*collide)(struct akgl_PhysicsBackend *self, akgl_Actor *a1, akgl_Actor *a2);
akerr_ErrorContext AKERR_NOIGNORE *(*move)(struct akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *(*move)(struct akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
double drag_x;
double drag_y;
@@ -23,15 +23,15 @@ typedef struct akgl_PhysicsBackend {
} akgl_PhysicsBackend;
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_null_gravity(akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_null_gravity(akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_null_collide(akgl_PhysicsBackend *self, akgl_Actor *a1, akgl_Actor *a2);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_null_move(akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_null_move(akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_init_null(akgl_PhysicsBackend *self);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_ss_gravity(akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_ss_gravity(akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_ss_collide(akgl_PhysicsBackend *self, akgl_Actor *a1, akgl_Actor *a2);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_ss_move(akgl_PhysicsBackend *self, akgl_Actor *actor, SDL_Time curtime);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_ss_move(akgl_PhysicsBackend *self, akgl_Actor *actor, float32_t dt);
akerr_ErrorContext AKERR_NOIGNORE *akgl_physics_init_sidescroller(akgl_PhysicsBackend *self);