(Feat): Initial Commit.

src/timing.c

@@ -0,0 +1,43 @@
+/**
+ * @file timing.c
+ * @brief High-precision timing utilities implementation
+ * @author ASCII3D Project
+ * @version 1.0.0
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include "timing.h"
+
+#include <time.h>
+
+double timing_get_seconds(void)
+{
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    return (double)ts.tv_sec + (double)ts.tv_nsec / 1.0e9;
+}
+
+void timing_sleep_us(unsigned int microseconds)
+{
+    struct timespec req;
+    req.tv_sec = microseconds / 1000000;
+    req.tv_nsec = (microseconds % 1000000) * 1000L;
+    nanosleep(&req, NULL);
+}
+
+void timing_limit_fps(double frame_start_time, int target_fps)
+{
+    if (target_fps <= 0) {
+        return;
+    }
+    
+    double target_frame_time = 1.0 / (double)target_fps;
+    double elapsed = timing_get_seconds() - frame_start_time;
+    double sleep_time = target_frame_time - elapsed;
+    
+    if (sleep_time > 0.0) {
+        unsigned int sleep_us = (unsigned int)(sleep_time * 1.0e6);
+        timing_sleep_us(sleep_us);
+    }
+}