Added high resolution timing API: SDL_GetPerformanceCounter(), SDL_GetPerformanceFrequency()

src/timer/beos/SDL_systimer.c

@@ -42,6 +42,18 @@ SDL_GetTicks(void)
     return ((system_time() - start) / 1000);
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return system_time();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 1000000;
+}
+
 void
 SDL_Delay(Uint32 ms)
 {

src/timer/dummy/SDL_systimer.c

@@ -37,6 +37,18 @@ SDL_GetTicks(void)
     return 0;
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return SDL_GetTicks();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 1000;
+}
+
 void
 SDL_Delay(Uint32 ms)
 {

src/timer/nds/SDL_systimer.c

@@ -52,6 +52,18 @@ SDL_GetTicks(void)
     return timer_ticks;
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return SDL_GetTicks();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 1000;
+}
+
 void
 SDL_Delay(Uint32 ms)
 {

src/timer/unix/SDL_systimer.c

@@ -64,6 +64,7 @@ SDL_GetTicks(void)
 #if HAVE_CLOCK_GETTIME
     Uint32 ticks;
     struct timespec now;
+
     clock_gettime(CLOCK_MONOTONIC, &now);
     ticks =
         (now.tv_sec - start.tv_sec) * 1000 + (now.tv_nsec -
@@ -72,6 +73,7 @@ SDL_GetTicks(void)
 #else
     Uint32 ticks;
     struct timeval now;
+
     gettimeofday(&now, NULL);
     ticks =
         (now.tv_sec - start.tv_sec) * 1000 + (now.tv_usec -
@@ -80,6 +82,40 @@ SDL_GetTicks(void)
 #endif
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+#if HAVE_CLOCK_GETTIME
+    Uint64 ticks;
+    struct timespec now;
+
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    ticks = now.tv_sec;
+    ticks *= 1000000000;
+    ticks += now.tv_nsec;
+    return (ticks);
+#else
+    Uint64 ticks;
+    struct timeval now;
+
+    gettimeofday(&now, NULL);
+    ticks = now.tv_sec;
+    ticks *= 1000000;
+    ticks += now.tv_usec;
+    return (ticks);
+#endif
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+#if HAVE_CLOCK_GETTIME
+    return 1000000000;
+#else
+    return 1000000;
+#endif
+}
+
 void
 SDL_Delay(Uint32 ms)
 {

src/timer/wince/SDL_systimer.c

@@ -87,6 +87,18 @@ SDL_GetTicks()
     return ((Uint32) wce_rel_ticks());
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return SDL_GetTicks();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 1000;
+}
+
 /* Give up approx. givem milliseconds to the OS. */
 void
 SDL_Delay(Uint32 ms)

src/timer/windows/SDL_systimer.c

@@ -99,6 +99,28 @@ SDL_GetTicks(void)
     return (ticks);
 }
 
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    LARGE_INTEGER counter;
+
+    if (!QueryPerformanceCounter(&counter)) {
+        return SDL_GetTicks();
+    }
+    return counter.QuadPart;
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    LARGE_INTEGER frequency;
+
+    if (!QueryPerformanceFrequency(&frequency)) {
+        return 1000;
+    }
+    return frequency.QuadPart;
+}
+
 void
 SDL_Delay(Uint32 ms)
 {