Add Dyna.net example.

examples/dyna/src/timer.cpp

@@ -0,0 +1,51 @@
+#include "timer.hpp"
+
+#include <SDL3/SDL.h>
+
+#include <random>
+
+namespace dyna
+{
+
+namespace Timer
+{
+int delta = 0;
+static std::int64_t timestamp = 0;
+
+void reset()
+{
+    delta = 0;
+    timestamp = static_cast<std::int64_t>( SDL_GetTicks() );
+}
+
+int tick()
+{
+    std::int64_t tmp = timestamp;
+    timestamp = static_cast<std::int64_t>( SDL_GetTicks() );
+    delta = static_cast<int>( timestamp - tmp );
+    return delta;
+}
+
+std::int64_t get_timestamp()
+{
+    return timestamp;
+}
+}
+
+namespace RNG
+{
+static std::mt19937& engine()
+{
+    static std::mt19937 e{ std::random_device{}() };
+    return e;
+}
+
+int next( int n )
+{
+    if( n <= 0 ) return 0;
+    std::uniform_int_distribution<int> dist( 0, n - 1 );
+    return dist( engine() );
+}
+}
+
+}