1 files changed, 150 insertions, 0 deletions
diff --git a/src/tests/core/host_timing.cpp b/src/tests/core/host_timing.cpp
new file mode 100644
index 000000000..ca9c8e50a
--- /dev/null
+++ b/src/tests/core/host_timing.cpp
@@ -0,0 +1,150 @@
+// Copyright 2016 Dolphin Emulator Project / 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <catch2/catch.hpp>
+
+#include <array>
+#include <bitset>
+#include <cstdlib>
+#include <memory>
+#include <string>
+
+#include "common/file_util.h"
+#include "core/core.h"
+#include "core/host_timing.h"
+
+// Numbers are chosen randomly to make sure the correct one is given.
+static constexpr std::array<u64, 5> CB_IDS{{42, 144, 93, 1026, UINT64_C(0xFFFF7FFFF7FFFF)}};
+static constexpr int MAX_SLICE_LENGTH = 10000; // Copied from CoreTiming internals
+static constexpr std::array<u64, 5> calls_order{{2,0,1,4,3}};
+static std::array<s64, 5> delays{};
+
+static std::bitset<CB_IDS.size()> callbacks_ran_flags;
+static u64 expected_callback = 0;
+static s64 lateness = 0;
+
+template <unsigned int IDX>
+void HostCallbackTemplate(u64 userdata, s64 nanoseconds_late) {
+    static_assert(IDX < CB_IDS.size(), "IDX out of range");
+    callbacks_ran_flags.set(IDX);
+    REQUIRE(CB_IDS[IDX] == userdata);
+    REQUIRE(CB_IDS[IDX] == CB_IDS[calls_order[expected_callback]]);
+    delays[IDX] = nanoseconds_late;
+    ++expected_callback;
+}
+
+static u64 callbacks_done = 0;
+
+struct ScopeInit final {
+    ScopeInit() {
+        core_timing.Initialize();
+    }
+    ~ScopeInit() {
+        core_timing.Shutdown();
+    }
+
+    Core::HostTiming::CoreTiming core_timing;
+};
+
+TEST_CASE("HostTiming[BasicOrder]", "[core]") {
+    ScopeInit guard;
+    auto& core_timing = guard.core_timing;
+    std::vector<std::shared_ptr<Core::HostTiming::EventType>> events;
+    events.resize(5);
+    events[0] =
+        Core::HostTiming::CreateEvent("callbackA", HostCallbackTemplate<0>);
+    events[1] =
+        Core::HostTiming::CreateEvent("callbackB", HostCallbackTemplate<1>);
+    events[2] =
+        Core::HostTiming::CreateEvent("callbackC", HostCallbackTemplate<2>);
+    events[3] =
+        Core::HostTiming::CreateEvent("callbackD", HostCallbackTemplate<3>);
+    events[4] =
+        Core::HostTiming::CreateEvent("callbackE", HostCallbackTemplate<4>);
+
+    expected_callback = 0;
+
+    core_timing.SyncPause(true);
+
+    u64 one_micro = 1000U;
+    for (std::size_t i = 0; i < events.size(); i++) {
+        u64 order = calls_order[i];
+        core_timing.ScheduleEvent(i*one_micro + 100U, events[order], CB_IDS[order]);
+    }
+    /// test pause
+    REQUIRE(callbacks_ran_flags.none());
+
+    core_timing.Pause(false); // No need to sync
+
+    while (core_timing.HasPendingEvents());
+
+    REQUIRE(callbacks_ran_flags.all());
+
+    for (std::size_t i = 0; i < delays.size(); i++) {
+        const double delay = static_cast<double>(delays[i]);
+        const double micro = delay / 1000.0f;
+        const double mili = micro / 1000.0f;
+        printf("HostTimer Pausing Delay[%zu]: %.3f %.6f\n", i, micro, mili);
+    }
+}
+
+#pragma optimize("", off)
+u64 TestTimerSpeed(Core::HostTiming::CoreTiming& core_timing) {
+    u64 start = core_timing.GetGlobalTimeNs().count();
+    u64 placebo = 0;
+    for (std::size_t i = 0; i < 1000; i++) {
+        placebo += core_timing.GetGlobalTimeNs().count();
+    }
+    u64 end = core_timing.GetGlobalTimeNs().count();
+    return (end - start);
+}
+#pragma optimize("", on)
+
+TEST_CASE("HostTiming[BasicOrderNoPausing]", "[core]") {
+    ScopeInit guard;
+    auto& core_timing = guard.core_timing;
+    std::vector<std::shared_ptr<Core::HostTiming::EventType>> events;
+    events.resize(5);
+    events[0] =
+        Core::HostTiming::CreateEvent("callbackA", HostCallbackTemplate<0>);
+    events[1] =
+        Core::HostTiming::CreateEvent("callbackB", HostCallbackTemplate<1>);
+    events[2] =
+        Core::HostTiming::CreateEvent("callbackC", HostCallbackTemplate<2>);
+    events[3] =
+        Core::HostTiming::CreateEvent("callbackD", HostCallbackTemplate<3>);
+    events[4] =
+        Core::HostTiming::CreateEvent("callbackE", HostCallbackTemplate<4>);
+
+    core_timing.SyncPause(true);
+    core_timing.SyncPause(false);
+
+    expected_callback = 0;
+
+    u64 start = core_timing.GetGlobalTimeNs().count();
+    u64 one_micro = 1000U;
+    for (std::size_t i = 0; i < events.size(); i++) {
+        u64 order = calls_order[i];
+        core_timing.ScheduleEvent(i*one_micro + 100U, events[order], CB_IDS[order]);
+    }
+    u64 end = core_timing.GetGlobalTimeNs().count();
+    const double scheduling_time = static_cast<double>(end - start);
+    const double timer_time = static_cast<double>(TestTimerSpeed(core_timing));
+
+    while (core_timing.HasPendingEvents());
+
+    REQUIRE(callbacks_ran_flags.all());
+
+    for (std::size_t i = 0; i < delays.size(); i++) {
+        const double delay = static_cast<double>(delays[i]);
+        const double micro = delay / 1000.0f;
+        const double mili = micro / 1000.0f;
+        printf("HostTimer No Pausing Delay[%zu]: %.3f %.6f\n", i, micro, mili);
+    }
+
+    const double micro = scheduling_time / 1000.0f;
+    const double mili = micro / 1000.0f;
+    printf("HostTimer No Pausing Scheduling Time: %.3f %.6f\n", micro, mili);
+    printf("HostTimer No Pausing Timer Time: %.3f %.6f\n", timer_time / 1000.f, timer_time / 1000000.f);
+}