Initial commit

src/engine/animation.c

@@ -0,0 +1,49 @@
+#include "engine/animation.h"
+
+void animation_set(Animation *a, const AnimDef *def) {
+    if (a->def == def) return; /* don't restart same anim */
+    a->def = def;
+    a->current_frame = 0;
+    a->timer = 0.0f;
+    a->finished = false;
+}
+
+void animation_update(Animation *a, float dt) {
+    if (!a->def || a->finished) return;
+
+    a->timer += dt;
+    while (a->timer >= a->def->frames[a->current_frame].duration) {
+        float dur = a->def->frames[a->current_frame].duration;
+        if (dur <= 0.0f) break;  /* avoid infinite loop on zero-duration frames */
+        a->timer -= dur;
+        a->current_frame++;
+
+        if (a->current_frame >= a->def->frame_count) {
+            if (a->def->looping) {
+                a->current_frame = 0;
+            } else {
+                a->current_frame = a->def->frame_count - 1;
+                a->finished = true;
+                a->timer = 0.0f;
+                return;
+            }
+        }
+    }
+}
+
+SDL_Rect animation_current_rect(const Animation *a) {
+    if (!a->def || a->def->frame_count == 0) {
+        return (SDL_Rect){0, 0, 0, 0};
+    }
+    return a->def->frames[a->current_frame].src;
+}
+
+bool animation_is_last_frame(const Animation *a) {
+    if (!a->def) return true;
+    return a->current_frame >= a->def->frame_count - 1;
+}
+
+SDL_Texture *animation_texture(const Animation *a) {
+    if (!a->def) return NULL;
+    return a->def->texture;
+}