mirror of https://github.com/stella-emu/stella.git
111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2020 by Bradford W. Mott, Stephen Anthony
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// and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//============================================================================
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#ifndef TIA_FRAME_LAYOUT_DETECTOR
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#define TIA_FRAME_LAYOUT_DETECTOR
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#include "FrameLayout.hxx"
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#include "AbstractFrameManager.hxx"
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/**
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* This frame manager performs frame layout autodetection. It counts the scanlines
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* in each frame and assigns guesses the frame layout from this.
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*/
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class FrameLayoutDetector: public AbstractFrameManager {
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public:
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FrameLayoutDetector();
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public:
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/**
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* Return the detected frame layout.
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*/
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FrameLayout detectedLayout() const;
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protected:
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/**
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* Hook into vsync changes.
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*/
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void onSetVsync() override;
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/**
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* Hook into reset.
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*/
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void onReset() override;
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/**
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* Hook into line changes.
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*/
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void onNextLine() override;
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private:
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/**
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* This frame manager only tracks frame boundaries, so we have only two states.
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*/
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enum class State {
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// Wait for VSYNC to be enabled.
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waitForVsyncStart,
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// Wait for VSYNC to be disabled.
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waitForVsyncEnd
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};
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private:
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/**
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* Change state and change internal state accordingly.
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*/
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void setState(State state);
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/**
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* Finalize the current frame and guess frame layout from the scanline count.
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*/
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void finalizeFrame();
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private:
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/**
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* The current state.
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*/
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State myState{State::waitForVsyncStart};
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/**
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* The total number of frames detected as the respective frame layout.
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*/
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uInt32 myNtscFrames{0}, myPalFrames{0};
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/**
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* We count the number of scanlines we spend waiting for vsync to be
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* toggled. If a threshold is exceeded, we force the transition.
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*/
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uInt32 myLinesWaitingForVsyncToStart{0};
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private:
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FrameLayoutDetector(const FrameLayoutDetector&) = delete;
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FrameLayoutDetector(FrameLayoutDetector&&) = delete;
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FrameLayoutDetector& operator=(const FrameLayoutDetector&) = delete;
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FrameLayoutDetector& operator=(FrameLayoutDetector&&) = delete;
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};
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#endif // TIA_FRAME_LAYOUT_DETECTOR
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