Adding physics system lerp function.

SDL3_Core

@@ -1 +1 @@
-Subproject commit af462380762093bee9e471799c7ce31732a4b248
+Subproject commit b63a67eb84262ea6e9883089cfc622d0a67f74cf

src/components/headers/physics_system.h

@@ -7,8 +7,10 @@
 
 typedef struct physics_system_data_t {
     transform_component_data_t *transform_component_data;
+    fvector2d_t target_velocity;
     fvector2d_t velocity;
     float speed;
+    float smoothing_factor;
 } physics_system_data_t;
 
 int physics_system_init(component_t *component);

src/components/headers/sprite_component.h

@@ -11,7 +11,7 @@ typedef struct sprite_component_data_t {
     texture_t *texture;
 
     rect_t src_rect;
-    rect_t dst_rect;
+    frect_t dst_rect;
 
     bool flip;
 } sprite_component_data_t;

src/components/headers/transform_component.h

@@ -14,7 +14,7 @@ int transform_component_update(component_t *component);
 
 #if DEBUG >= 2
 int transform_component_draw(component_t *component);
-#endif
+#endif // DEBUG >= 2
 
 int transform_component_destroy(component_t *component);
 

src/components/physics_system.c

@@ -11,6 +11,11 @@ int physics_system_init(component_t *component)
     component_data->transform_component_data = entity_get_component(component->entity, TRANSFORM_COMPONENT)->component_data;
     if(!component_data->transform_component_data) return EXIT_FAILURE;
 
+    component_data->target_velocity = (fvector2d_t) {
+        .x = 0.0f,
+        .y = 0.0f
+    };
+
     component_data->velocity = (fvector2d_t) {
         .x = 0.0f,
         .y = 0.0f
@@ -18,6 +23,8 @@ int physics_system_init(component_t *component)
 
     component_data->speed = 0.0f;
 
+    component_data->smoothing_factor = 1.0f;
+
     return EXIT_SUCCESS;
 }
 
@@ -26,6 +33,9 @@ int physics_system_update(component_t *component)
     physics_system_data_t *component_data = component->component_data;
     transform_component_data_t *transform_component_data = component_data->transform_component_data;
 
+    component_data->velocity.x = lerp(component_data->velocity.x, component_data->target_velocity.x, component_data->smoothing_factor);
+    component_data->velocity.y = lerp(component_data->velocity.y, component_data->target_velocity.y, component_data->smoothing_factor);
+
     transform_component_data->bounds.x += component_data->velocity.x * component_data->speed * (float)game.delta_time_ms / 1000.0f;
     transform_component_data->bounds.y += component_data->velocity.y * component_data->speed * (float)game.delta_time_ms / 1000.0f;
 

src/components/player_system.c

@@ -65,15 +65,15 @@ static inline void player_system_set_velocity(player_system_data_t *system_data)
 
     if((system_data->state & PLAYER_MOVING) != (system_data->last_state & PLAYER_MOVING))
     {
-        physics_system_data->velocity.x =
+        physics_system_data->target_velocity.x =
             (float)((system_data->state & PLAYER_MOVING_RIGHT) >> 3) - (float)((system_data->state & PLAYER_MOVING_LEFT) >> 2);
-        physics_system_data->velocity.y =
+        physics_system_data->target_velocity.y =
             (float)((system_data->state & PLAYER_MOVING_DOWN) >> 1) - (float)(system_data->state & PLAYER_MOVING_UP);
 
-        if(f_is_not_zero(physics_system_data->velocity.x) && f_is_not_zero(physics_system_data->velocity.y))
+        if(f_is_not_zero(physics_system_data->target_velocity.x) && f_is_not_zero(physics_system_data->target_velocity.y))
         {
-            physics_system_data->velocity.x *= 0.707106781186548f;
-            physics_system_data->velocity.y *= 0.707106781186548f;
+            physics_system_data->target_velocity.x *= 0.707106781186548f;
+            physics_system_data->target_velocity.y *= 0.707106781186548f;
         }
     }
 }

src/components/sprite_component.c

@@ -20,8 +20,6 @@ inline int sprite_component_init(component_t *component)
     component_data->src_rect.x = 0.0f;
     component_data->src_rect.y = 0.0f;
 
-    frect_to_rect(&transform_component_data->bounds, &component_data->dst_rect);
-
     component_data->flip = false;
 
     return EXIT_SUCCESS;
@@ -30,7 +28,7 @@ inline int sprite_component_init(component_t *component)
 inline int sprite_component_update(component_t *component)
 {
     sprite_component_data_t *component_data = component->component_data;
-    frect_to_rect(&component_data->transform_component_data->bounds, &component_data->dst_rect);
+    component_data->dst_rect = component_data->transform_component_data->bounds;
 
     return EXIT_SUCCESS;
 }

src/components/transform_component.c

@@ -18,7 +18,7 @@ int transform_component_init(component_t *component)
     return EXIT_SUCCESS;
 }
 
-inline int transform_component_update(component_t *component)
+inline int transform_component_update(component_t *component __attribute__((unused)))
 {
     return EXIT_SUCCESS;
 }