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Core: Re-write frame limiter

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Now based on std::chrono, and also works in terms of emulated time
instead of frames, so we can in the future frame-limit even when the
display is disabled, etc.

The frame limiter can also be enabled along with v-sync now, which
should be useful for those with displays running at more than 60 Hz.
This commit is contained in:
Yuri Kunde Schlesner 2017-02-20 16:31:59 -08:00
parent b285c2a4ed
commit fb1979d7e2
5 changed files with 53 additions and 42 deletions
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39
src/core/hw/gpu.cpp
View file

@ -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);