refa Replace SDL timer with C++ timer

1 files changed, 11 insertions, 8 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 34cbcb4..5155f60 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#include <chrono>
+#include <thread>
+
 #include "camera.hpp"
 #include "candy_gear.hpp"
 #include "core.hpp"
@@ -33,8 +36,10 @@ static void handle_error(mrb_state *mrb)
 
 int main(int argc, char *argv[])
 {
+  using namespace std::chrono;
+  using namespace std::this_thread;
+
   SDL_Event event;
-  Uint32 frame_start;
 
   // Random numbers
   random_number_generator.seed(random_seed());
@@ -79,7 +84,7 @@ int main(int argc, char *argv[])
     if (cg_core.mrb->exc) handle_error(cg_core.mrb);
   }
 
-  frame_start = SDL_GetTicks();
+  auto frame_start = steady_clock::now();
 
   // Game main loop.
   while(!cg_core.quit_game)
@@ -118,14 +123,12 @@ int main(int argc, char *argv[])
 
     // Timer
     {
-      Uint32 frame_stop, frame_duration;
-
-      frame_stop = SDL_GetTicks();
-      frame_duration = frame_stop - frame_start;
+      auto frame_stop = steady_clock::now();
+      auto frame_duration = frame_stop - frame_start;
 
       // If frame take less time than maximum allowed.
-      if(cg_core.max_frame_duration_ms > frame_duration)
-	SDL_Delay(cg_core.max_frame_duration_ms - frame_duration);
+      if(cg_core.max_frame_duration > frame_duration)
+	sleep_for(cg_core.max_frame_duration - frame_duration);
 
       frame_start = frame_stop;
     }