Refactoring to enable future time scaling, coordinated clocks, etc.

src/xenia/base/clock.cc

@@ -0,0 +1,96 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/clock.h"
+
+#include "xenia/base/platform.h"
+
+namespace xe {
+
+double guest_time_scalar_ = 1.0;
+uint64_t guest_tick_frequency_ = Clock::host_tick_frequency();
+uint64_t guest_system_time_base_ = Clock::QueryHostSystemTime();
+
+uint64_t Clock::host_tick_frequency() {
+  static LARGE_INTEGER frequency = {0};
+  if (!frequency.QuadPart) {
+    QueryPerformanceFrequency(&frequency);
+  }
+  return frequency.QuadPart;
+}
+
+uint64_t Clock::QueryHostTickCount() {
+  LARGE_INTEGER counter;
+  uint64_t time = 0;
+  if (QueryPerformanceCounter(&counter)) {
+    time = counter.QuadPart;
+  }
+  return time;
+}
+
+uint64_t Clock::QueryHostSystemTime() {
+  FILETIME t;
+  GetSystemTimeAsFileTime(&t);
+  return (uint64_t(t.dwHighDateTime) << 32) | t.dwLowDateTime;
+}
+
+uint32_t Clock::QueryHostUptimeMillis() { return ::GetTickCount(); }
+
+double Clock::guest_time_scalar() { return guest_time_scalar_; }
+
+void Clock::set_guest_time_scalar(double scalar) {
+  guest_time_scalar_ = scalar;
+}
+
+uint64_t Clock::guest_tick_frequency() { return guest_tick_frequency_; }
+
+void Clock::set_guest_tick_frequency(uint64_t frequency) {
+  guest_tick_frequency_ = frequency;
+}
+
+uint64_t Clock::guest_system_time_base() { return guest_system_time_base_; }
+
+void Clock::set_guest_system_time_base(uint64_t time_base) {
+  guest_system_time_base_ = time_base;
+}
+
+uint64_t Clock::QueryGuestTickCount() {
+  // TODO(benvanik): adjust.
+  return QueryHostTickCount();
+}
+
+uint64_t Clock::QueryGuestSystemTime() {
+  // TODO(benvanik): adjust.
+  return QueryHostSystemTime();
+}
+
+uint32_t Clock::QueryGuestUptimeMillis() {
+  // TODO(benvanik): adjust.
+  return QueryHostUptimeMillis();
+}
+
+uint32_t Clock::ScaleGuestDurationMillis(uint32_t guest_ms) {
+  // TODO(benvanik): adjust.
+  // if -1, return -1
+  // if 0, return 0
+  return guest_ms;
+}
+
+int64_t Clock::ScaleGuestDurationFileTime(int64_t guest_file_time) {
+  // TODO(benvanik): adjust.
+  // negative = relative times
+  // positive = absolute times
+  return guest_file_time;
+}
+
+void Clock::ScaleGuestDurationTimeval(long* tv_sec, long* tv_usec) {
+  // TODO(benvanik): adjust.
+}
+
+}  // namespace xe