Improve lovr.timer;

src/lovr/timer.c

@@ -2,6 +2,8 @@
 #include "../timer/timer.h"
 
 const luaL_Reg lovrTimer[] = {
+  { "getDelta", l_lovrTimerGetDelta },
+  { "getTime", l_lovrTimerGetTime },
   { "step", l_lovrTimerStep },
   { "sleep", l_lovrTimerSleep },
   { NULL, NULL }
@@ -10,6 +12,17 @@ const luaL_Reg lovrTimer[] = {
 int l_lovrTimerInit(lua_State* L) {
   lua_newtable(L);
   luaL_register(L, NULL, lovrTimer);
+  lovrTimerInit();
+  return 1;
+}
+
+int l_lovrTimerGetDelta(lua_State* L) {
+  lua_pushnumber(L, lovrTimerGetDelta());
+  return 1;
+}
+
+int l_lovrTimerGetTime(lua_State* L) {
+  lua_pushnumber(L, lovrTimerGetTime());
   return 1;
 }
 

src/lovr/timer.h

@@ -4,5 +4,7 @@
 
 extern const luaL_Reg lovrTimer[];
 int l_lovrTimerInit(lua_State* L);
+int l_lovrTimerGetDelta(lua_State* L);
+int l_lovrTimerGetTime(lua_State* L);
 int l_lovrTimerStep(lua_State* L);
 int l_lovrTimerSleep(lua_State* L);

src/timer/timer.c

@@ -6,10 +6,25 @@
 #include <unistd.h>
 #endif
 
+static TimerState timerState;
+
+void lovrTimerInit() {
+  lovrTimerStep();
+}
+
+double lovrTimerGetDelta() {
+  return timerState.dt;
+}
+
+double lovrTimerGetTime() {
+  return glfwGetTime();
+}
+
 double lovrTimerStep() {
-  double time = glfwGetTime();
-  glfwSetTime(0);
-  return time;
+  timerState.lastTime = timerState.time;
+  timerState.time = glfwGetTime();
+  timerState.dt = timerState.time - timerState.lastTime;
+  return timerState.dt;
 }
 
 void lovrTimerSleep(double seconds) {

src/timer/timer.h

@@ -1,2 +1,13 @@
+#ifndef LOVR_TIMER_TYPES
+typedef struct {
+  double lastTime;
+  double time;
+  double dt;
+} TimerState;
+#endif
+
+void lovrTimerInit();
+double lovrTimerGetDelta();
+double lovrTimerGetTime();
 double lovrTimerStep();
 void lovrTimerSleep(double seconds);