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d97a073d1b
They all just as the CRT, as all are currently based on the CRT. Which doesn't currently know the total clock rate it would need to in order properly to scale the answer to the question. Further thought coming.
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
//
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// Video.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 06/06/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Machines_ZX8081_Video_hpp
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#define Machines_ZX8081_Video_hpp
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#include "../../Outputs/CRT/CRT.hpp"
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#include "../../ClockReceiver/ClockReceiver.hpp"
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namespace ZX8081 {
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/*!
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Packages a ZX80/81-style video feed into a CRT-compatible waveform.
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While sync is active, this feed will output the sync level.
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While sync is inactive, this feed will output the white level unless it is supplied
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with a byte to output. When a byte is supplied for output, it will be interpreted as
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a 1-bit graphic and output over the next 4 cycles, picking between the white level
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and the black level.
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*/
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class Video {
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public:
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/// Constructs an instance of the video feed.
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Video();
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/// Advances time by @c half-cycles.
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void run_for(const HalfCycles);
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/// Forces output to catch up to the current output position.
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void flush();
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/// Sets the current sync output.
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void set_sync(bool sync);
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/// Causes @c byte to be serialised into pixels and output over the next four cycles.
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void output_byte(uint8_t byte);
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/// Sets the scan target.
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void set_scan_target(Outputs::Display::ScanTarget *scan_target);
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/// Gets the current scan status.
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Outputs::Display::ScanStatus get_scan_status() const;
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private:
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bool sync_ = false;
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uint8_t *line_data_ = nullptr;
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uint8_t *line_data_pointer_ = nullptr;
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HalfCycles time_since_update_ = 0;
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Outputs::CRT::CRT crt_;
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void flush(bool next_sync);
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};
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}
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#endif /* Video_hpp */
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