Initial commit

src/engine/camera.h

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+#ifndef JNR_CAMERA_H
+#define JNR_CAMERA_H
+
+#include "util/vec2.h"
+#include "config.h"
+
+typedef struct Camera {
+    Vec2  pos;           /* world position of top-left corner  */
+    Vec2  viewport;      /* screen dimensions in game pixels   */
+    Vec2  bounds_min;    /* level bounds (top-left)            */
+    Vec2  bounds_max;    /* level bounds (bottom-right)        */
+    float smoothing;     /* higher = slower follow (0=instant) */
+    Vec2  deadzone;      /* half-size of deadzone rect         */
+    Vec2  look_ahead;    /* pixels to lead in move direction   */
+    /* Screen shake */
+    float shake_timer;   /* remaining shake time               */
+    float shake_intensity; /* current max pixel offset          */
+    Vec2  shake_offset;  /* current frame shake displacement   */
+} Camera;
+
+void camera_init(Camera *c, float vp_w, float vp_h);
+void camera_set_bounds(Camera *c, float world_w, float world_h);
+void camera_follow(Camera *c, Vec2 target, Vec2 velocity, float dt);
+
+/* Convert world position to screen position */
+Vec2 camera_world_to_screen(const Camera *c, Vec2 world_pos);
+
+/* Convert screen position to world position */
+Vec2 camera_screen_to_world(const Camera *c, Vec2 screen_pos);
+
+/* Trigger screen shake (intensity in pixels, duration in seconds) */
+void camera_shake(Camera *c, float intensity, float duration);
+
+/* Update shake (call once per frame, after camera_follow) */
+void camera_update_shake(Camera *c, float dt);
+
+#endif /* JNR_CAMERA_H */