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Implement Frame rate limiter (#2223)

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* implement frame limiter

* fixes
This commit is contained in:
emmauss 2016-12-07 07:33:19 +12:00 • committed by bunnei
parent c0d9e4e435
commit c4e4fa53d9
10 changed files with 54 additions and 0 deletions
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33
src/core/hw/gpu.cpp
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@ -8,7 +8,10 @@
#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"
@ -35,6 +38,14 @@ const u64 frame_ticks = 268123480ull / 60;
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 / 60;
// 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) {
@ -512,6 +523,21 @@ 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++;
@ -528,6 +554,12 @@ static void VBlankCallback(u64 userdata, int cycles_late) {
// Check for user input updates
Service::HID::Update();
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);
}
@ -563,6 +595,7 @@ void Init() {
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);