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58 lines
1.1 KiB
C++
58 lines
1.1 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 12/10/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Video_hpp
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#define Video_hpp
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#include "../../Outputs/CRT/CRT.hpp"
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namespace Oric {
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class VideoOutput {
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public:
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VideoOutput(uint8_t *memory);
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std::shared_ptr<Outputs::CRT::CRT> get_crt();
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void run_for_cycles(int number_of_cycles);
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private:
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uint8_t *_ram;
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std::shared_ptr<Outputs::CRT::CRT> _crt;
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// Counters
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int _counter, _frame_counter;
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// Output state
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enum State {
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Blank, Sync, Pixels, ColourBurst
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} _state;
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unsigned int _cycles_in_state;
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uint8_t *_pixel_target;
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// Registers
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uint8_t _ink, _paper;
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int _character_set_base_address;
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inline void set_character_set_base_address()
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{
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if(_is_graphics_mode) _character_set_base_address = _use_alternative_character_set ? 0x9c00 : 0x9800;
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else _character_set_base_address = _use_alternative_character_set ? 0xb800 : 0xb400;
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}
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bool _is_graphics_mode;
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bool _is_sixty_hertz;
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bool _use_alternative_character_set;
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bool _use_double_height_characters;
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bool _blink_text;
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uint8_t _phase;
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};
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}
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#endif /* Video_hpp */
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