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-rw-r--r--src/core/core.h1
-rw-r--r--src/core/hw/gpu.cpp39
-rw-r--r--src/core/perf_stats.cpp33
-rw-r--r--src/core/perf_stats.h16
4 files changed, 50 insertions, 39 deletions
diff --git a/src/core/core.h b/src/core/core.h
index db3b98a05..6c9c936b5 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -94,6 +94,7 @@ public:
}
PerfStats perf_stats;
+ FrameLimiter frame_limiter;
private:
/**
diff --git a/src/core/hw/gpu.cpp b/src/core/hw/gpu.cpp
index 7cf081aad..42809c731 100644
--- a/src/core/hw/gpu.cpp
+++ b/src/core/hw/gpu.cpp
@@ -8,17 +8,13 @@
#include "common/color.h"
#include "common/common_types.h"
#include "common/logging/log.h"
-#include "common/math_util.h"
#include "common/microprofile.h"
-#include "common/thread.h"
-#include "common/timer.h"
#include "common/vector_math.h"
#include "core/core_timing.h"
#include "core/hle/service/gsp_gpu.h"
#include "core/hw/gpu.h"
#include "core/hw/hw.h"
#include "core/memory.h"
-#include "core/settings.h"
#include "core/tracer/recorder.h"
#include "video_core/command_processor.h"
#include "video_core/debug_utils/debug_utils.h"
@@ -35,16 +31,6 @@ Regs g_regs;
const u64 frame_ticks = BASE_CLOCK_RATE_ARM11 / SCREEN_REFRESH_RATE;
/// Event id for CoreTiming
static int vblank_event;
-/// Total number of frames drawn
-static u64 frame_count;
-/// Start clock for frame limiter
-static u32 time_point;
-/// Total delay caused by slow frames
-static float time_delay;
-constexpr float FIXED_FRAME_TIME = 1000.0f / SCREEN_REFRESH_RATE;
-// Max lag caused by slow frames. Can be adjusted to compensate for too many slow frames. Higher
-// values increases time needed to limit frame rate after spikes
-constexpr float MAX_LAG_TIME = 18;
template <typename T>
inline void Read(T& var, const u32 raw_addr) {
@@ -522,24 +508,8 @@ template void Write<u32>(u32 addr, const u32 data);
template void Write<u16>(u32 addr, const u16 data);
template void Write<u8>(u32 addr, const u8 data);
-static void FrameLimiter() {
- time_delay += FIXED_FRAME_TIME;
- time_delay = MathUtil::Clamp(time_delay, -MAX_LAG_TIME, MAX_LAG_TIME);
- s32 desired_time = static_cast<s32>(time_delay);
- s32 elapsed_time = static_cast<s32>(Common::Timer::GetTimeMs() - time_point);
-
- if (elapsed_time < desired_time) {
- Common::SleepCurrentThread(desired_time - elapsed_time);
- }
-
- u32 frame_time = Common::Timer::GetTimeMs() - time_point;
-
- time_delay -= frame_time;
-}
-
/// Update hardware
static void VBlankCallback(u64 userdata, int cycles_late) {
- frame_count++;
VideoCore::g_renderer->SwapBuffers();
// Signal to GSP that GPU interrupt has occurred
@@ -550,12 +520,6 @@ static void VBlankCallback(u64 userdata, int cycles_late) {
Service::GSP::SignalInterrupt(Service::GSP::InterruptId::PDC0);
Service::GSP::SignalInterrupt(Service::GSP::InterruptId::PDC1);
- if (!Settings::values.use_vsync && Settings::values.toggle_framelimit) {
- FrameLimiter();
- }
-
- time_point = Common::Timer::GetTimeMs();
-
// Reschedule recurrent event
CoreTiming::ScheduleEvent(frame_ticks - cycles_late, vblank_event);
}
@@ -590,9 +554,6 @@ void Init() {
framebuffer_sub.color_format.Assign(Regs::PixelFormat::RGB8);
framebuffer_sub.active_fb = 0;
- frame_count = 0;
- time_point = Common::Timer::GetTimeMs();
-
vblank_event = CoreTiming::RegisterEvent("GPU::VBlankCallback", VBlankCallback);
CoreTiming::ScheduleEvent(frame_ticks, vblank_event);
diff --git a/src/core/perf_stats.cpp b/src/core/perf_stats.cpp
index 06bc788bd..eb59a1332 100644
--- a/src/core/perf_stats.cpp
+++ b/src/core/perf_stats.cpp
@@ -4,11 +4,16 @@
#include <chrono>
#include <mutex>
+#include <thread>
+#include "common/math_util.h"
#include "core/hw/gpu.h"
#include "core/perf_stats.h"
+#include "core/settings.h"
+using namespace std::chrono_literals;
using DoubleSecs = std::chrono::duration<double, std::chrono::seconds::period>;
using std::chrono::duration_cast;
+using std::chrono::microseconds;
namespace Core {
@@ -69,4 +74,32 @@ double PerfStats::GetLastFrameTimeScale() {
return duration_cast<DoubleSecs>(previous_frame_length).count() / FRAME_LENGTH;
}
+void FrameLimiter::DoFrameLimiting(u64 current_system_time_us) {
+ // Max lag caused by slow frames. Can be adjusted to compensate for too many slow frames. Higher
+ // values increases time needed to limit frame rate after spikes.
+ constexpr microseconds MAX_LAG_TIME_US = 25ms;
+
+ if (!Settings::values.toggle_framelimit) {
+ return;
+ }
+
+ auto now = Clock::now();
+
+ frame_limiting_delta_err += microseconds(current_system_time_us - previous_system_time_us);
+ frame_limiting_delta_err -= duration_cast<microseconds>(now - previous_walltime);
+ frame_limiting_delta_err =
+ MathUtil::Clamp(frame_limiting_delta_err, -MAX_LAG_TIME_US, MAX_LAG_TIME_US);
+
+ if (frame_limiting_delta_err > microseconds::zero()) {
+ std::this_thread::sleep_for(frame_limiting_delta_err);
+
+ auto now_after_sleep = Clock::now();
+ frame_limiting_delta_err -= duration_cast<microseconds>(now_after_sleep - now);
+ now = now_after_sleep;
+ }
+
+ previous_system_time_us = current_system_time_us;
+ previous_walltime = now;
+}
+
} // namespace Core
diff --git a/src/core/perf_stats.h b/src/core/perf_stats.h
index 4098fc1f2..b03adab68 100644
--- a/src/core/perf_stats.h
+++ b/src/core/perf_stats.h
@@ -55,4 +55,20 @@ private:
u32 game_frames = 0;
};
+class FrameLimiter {
+public:
+ using Clock = std::chrono::high_resolution_clock;
+
+ void DoFrameLimiting(u64 current_system_time_us);
+
+private:
+ /// Emulated system time (in microseconds) at the last limiter invocation
+ u64 previous_system_time_us = 0;
+ /// Walltime at the last limiter invocation
+ Clock::time_point previous_walltime = Clock::now();
+
+ /// Accumulated difference between walltime and emulated time
+ std::chrono::microseconds frame_limiting_delta_err{0};
+};
+
} // namespace Core