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89 lines
1.9 KiB
C++
89 lines
1.9 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 31/10/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#ifndef Apple_IIgs_Video_hpp
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#define Apple_IIgs_Video_hpp
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#include "../AppleII/VideoSwitches.hpp"
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#include "../../../Outputs/CRT/CRT.hpp"
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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namespace Apple {
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namespace IIgs {
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namespace Video {
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/*!
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Provides IIgs video output; assumed clocking here is twice the usual Apple II clock.
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So it'll produce a single line of video every 131 cycles — 65*2 + 1, allowing for the
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stretched cycle.
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*/
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class VideoBase: public Apple::II::VideoSwitches<Cycles> {
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public:
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VideoBase();
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void set_internal_ram(const uint8_t *);
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bool get_is_vertical_blank();
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void set_new_video(uint8_t);
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uint8_t get_new_video();
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void clear_interrupts(uint8_t);
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uint8_t get_interrupt_register();
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void set_interrupt_register(uint8_t);
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void notify_clock_tick();
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void set_border_colour(uint8_t);
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void set_text_colour(uint8_t);
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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_scaled_scan_status() const;
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/// Sets the type of output.
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void set_display_type(Outputs::Display::DisplayType);
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/// Gets the type of output.
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Outputs::Display::DisplayType get_display_type() const;
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private:
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Outputs::CRT::CRT crt_;
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void advance(Cycles);
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uint8_t new_video_ = 0x01;
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uint8_t interrupts_ = 0x00;
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void set_interrupts(uint8_t);
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int cycles_into_frame_ = 0;
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const uint8_t *ram_ = nullptr;
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// The modal colours.
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uint16_t border_colour_ = 0;
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uint16_t text_colour_ = 0xffff;
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uint16_t background_colour_ = 0;
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// Current pixel output buffer.
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uint16_t *pixels_ = nullptr, *next_pixel_ = nullptr;
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void output_row(int row, int start, int end);
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};
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class Video: public VideoBase {
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public:
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using VideoBase::VideoBase;
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};
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}
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}
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}
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#endif /* Video_hpp */
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