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Add a VsyncSource for renderers that already block for V-sync

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This commit is contained in:
Cameron Gutman 2018-08-20 17:24:47 -07:00
parent 1a60484abc
commit d6e7173af0
3 changed files with 67 additions and 2 deletions
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7
app/app.pro
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@ -116,12 +116,15 @@ ffmpeg {
SOURCES += \
streaming/video/ffmpeg.cpp \
streaming/video/ffmpeg-renderers/sdl.cpp \
streaming/video/ffmpeg-renderers/pacer/pacer.cpp
streaming/video/ffmpeg-renderers/pacer/pacer.cpp \
streaming/video/ffmpeg-renderers/pacer/nullthreadedvsyncsource.cpp
HEADERS += \
streaming/video/ffmpeg.h \
streaming/video/ffmpeg-renderers/renderer.h \
streaming/video/ffmpeg-renderers/pacer/pacer.h
streaming/video/ffmpeg-renderers/pacer/pacer.h \
streaming/video/ffmpeg-renderers/pacer/nullthreadedvsyncsource.h
}
libva {
message(VAAPI renderer selected)

42
app/streaming/video/ffmpeg-renderers/pacer/nullthreadedvsyncsource.cpp Normal file
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@ -0,0 +1,42 @@
#include "nullthreadedvsyncsource.h"
NullThreadedVsyncSource::NullThreadedVsyncSource(Pacer* pacer) :
m_Pacer(pacer),
m_Thread(nullptr)
{
SDL_AtomicSet(&m_Stopping, 0);
}
NullThreadedVsyncSource::~NullThreadedVsyncSource()
{
if (m_Thread != nullptr) {
SDL_AtomicSet(&m_Stopping, 1);
SDL_WaitThread(m_Thread, nullptr);
}
}
bool NullThreadedVsyncSource::initialize(SDL_Window*)
{
m_Thread = SDL_CreateThread(vsyncThread, "Null Vsync Thread", this);
if (m_Thread == nullptr) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Unable to create DX V-sync thread: %s",
SDL_GetError());
return false;
}
return true;
}
int NullThreadedVsyncSource::vsyncThread(void* context)
{
NullThreadedVsyncSource* me = reinterpret_cast<NullThreadedVsyncSource*>(context);
SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
while (SDL_AtomicGet(&me->m_Stopping) == 0) {
me->m_Pacer->vsyncCallback();
}
return 0;
}

20
app/streaming/video/ffmpeg-renderers/pacer/nullthreadedvsyncsource.h Normal file
View file

@ -0,0 +1,20 @@
#pragma once
#include "pacer.h"
class NullThreadedVsyncSource : public IVsyncSource
{
public:
NullThreadedVsyncSource(Pacer* pacer);
virtual ~NullThreadedVsyncSource();
virtual bool initialize(SDL_Window* window);
private:
static int vsyncThread(void* context);
Pacer* m_Pacer;
SDL_Thread* m_Thread;
SDL_atomic_t m_Stopping;
};