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#include "video_timer.hpp"
#include "../std/target_os.hpp"
#include <CoreVideo/CVDisplayLink.h>
class AppleVideoTimer : public VideoTimer
{
CVDisplayLinkRef m_displayLink;
public:
AppleVideoTimer(VideoTimer::TFrameFn frameFn)
: VideoTimer(frameFn), m_displayLink(0)
{}
~AppleVideoTimer()
{
stop();
}
static CVReturn displayLinkCallback(
CVDisplayLinkRef /*displayLink*/,
const CVTimeStamp * /*inNow*/,
const CVTimeStamp * /*inOutputTime*/,
CVOptionFlags /*flagsIn*/,
CVOptionFlags * /*flagsOut*/,
void * displayLinkContext
)
{
AppleVideoTimer * t = reinterpret_cast<AppleVideoTimer*>(displayLinkContext);
t->perform();
return kCVReturnSuccess;
}
void start()
{
if (m_displayLink == 0)
{
CVDisplayLinkCreateWithActiveCGDisplays(&m_displayLink);
CVDisplayLinkSetOutputCallback(m_displayLink, &displayLinkCallback, (void*)this);
resume();
}
}
void resume()
{
CVDisplayLinkStart(m_displayLink);
m_state = ERunning;
}
void pause()
{
CVDisplayLinkStop(m_displayLink);
m_state = EPaused;
}
void stop()
{
if (m_displayLink)
{
if (state() == ERunning)
pause();
CVDisplayLinkRelease(m_displayLink);
m_displayLink = 0;
m_state = EStopped;
}
}
void perform()
{
m_frameFn();
}
};
VideoTimer * CreateAppleVideoTimer(VideoTimer::TFrameFn frameFn)
{
return new AppleVideoTimer(frameFn);
}
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