Abstracted frame timing stuff

2 files changed, 35 insertions, 13 deletions

@@ -2,6 +2,7 @@
 #include "renderer.h"
 #include "game.h"
 #include "party.h"
+#include "timer.h"
 
 void loop(Renderer& renderer) {
   Game game;
@@ -18,11 +19,8 @@ void loop(Renderer& renderer) {
 
   renderer.render(game);
 
-  size_t inputDt = 50;
-  size_t inputAcc = 0;
-
-  size_t animDt = 1000/5;//30fps * 1000 t/s;
-  size_t animAcc = 0;
+  Timer inputTimer(50);
+  Timer animTimer(1000/5);//30fps * 1000 t/s;
 
   size_t lastTime = SDL_GetTicks();
 
@@ -44,17 +42,13 @@ void loop(Renderer& renderer) {
     keystate.up = state[SDL_SCANCODE_UP];
     keystate.down = state[SDL_SCANCODE_DOWN];
 
-    inputAcc += frameTime;
-    while (inputAcc > inputDt) {
-      inputAcc -= inputDt;
-
+    inputTimer.accumulate(frameTime);
+    while (inputTimer.step()) {
       party.move(game, keystate);
     }
 
-    animAcc += frameTime;
-    while (animAcc > animDt) {
-      animAcc -= animDt;
-
+    animTimer.accumulate(frameTime);
+    while (animTimer.step()) {
       game.tickSpriteAnim();
     }
 
@@ -0,0 +1,28 @@
+#ifndef TIMER_H_45E2F1F9
+#define TIMER_H_45E2F1F9
+
+class Timer {
+public:
+
+  Timer(int dt) : dt_(dt) {}
+
+  void accumulate(int t) {
+    acc_ += t;
+  }
+
+  bool step() {
+    if (acc_ > dt_) {
+      acc_ -= dt_;
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+private:
+
+  int dt_;
+  int acc_ = 0;
+};
+
+#endif /* end of include guard: TIMER_H_45E2F1F9 */