build: add XInput2 library dependency for raw key event monitoring

include/dwn.h

@@ -203,8 +203,32 @@ typedef struct {
     bool desktop_shown;
     Window desktop_minimized[MAX_CLIENTS];
     int desktop_minimized_count;
+
+    float ambient_phase;
+    float ambient_speed;
+    long typing_activity_time;
+
+    unsigned long key_press_count;
+    long key_delete_flicker_time;
+    int xi2_opcode;
+    double mouse_distance_pixels;
+    int last_mouse_x;
+    int last_mouse_y;
+    bool mouse_tracking_initialized;
 } DWNState;
 
+#define PHASE_OFFSET_PANEL_BG      0.0f
+#define PHASE_OFFSET_WORKSPACES    0.8f
+#define PHASE_OFFSET_TASKBAR       1.6f
+#define PHASE_OFFSET_CLOCK         2.4f
+#define PHASE_OFFSET_STATS         3.2f
+#define PHASE_OFFSET_TOP_MEM       4.0f
+#define PHASE_OFFSET_DECORATIONS   4.8f
+#define PHASE_OFFSET_SYSTRAY       5.6f
+#define PHASE_OFFSET_NEWS          1.2f
+#define PHASE_OFFSET_KEY_COUNTER   5.2f
+#define PHASE_OFFSET_MOUSE_DIST    5.8f
+
 extern DWNState *dwn;
 
 int dwn_init(void);

include/util.h

@@ -59,6 +59,8 @@ unsigned long adjust_color_for_background(unsigned long color, unsigned long bg)
 unsigned long interpolate_color(unsigned long from, unsigned long to, float progress);
 unsigned long dim_color(unsigned long color, float factor);
 unsigned long glow_color(unsigned long base, float phase);
+unsigned long ambient_glow_bg(unsigned long base, float phase);
+unsigned long ambient_glow_accent(unsigned long base, float phase);
 
 long get_time_ms(void);
 void sleep_ms(int ms);