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65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
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//
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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 10/12/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Machines_Electron_Video_hpp
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#define Machines_Electron_Video_hpp
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#include "../../Outputs/CRT/CRT.hpp"
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#include "Interrupts.hpp"
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namespace Electron {
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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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int get_cycles_until_next_interrupt();
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Interrupt get_next_interrupt();
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void set_register(int address, uint8_t value);
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private:
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inline void start_pixel_line();
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inline void end_pixel_line();
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inline void output_pixels(unsigned int number_of_cycles);
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int output_position_;
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uint8_t palette_[16];
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uint8_t screen_mode_;
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uint16_t screen_mode_base_address_;
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uint16_t start_screen_address_;
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uint8_t *ram_;
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struct {
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uint16_t forty1bpp[256];
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uint8_t forty2bpp[256];
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uint32_t eighty1bpp[256];
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uint16_t eighty2bpp[256];
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uint8_t eighty4bpp[256];
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} palette_tables_;
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// Display generation.
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uint16_t start_line_address_, current_screen_address_;
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int current_pixel_line_, current_pixel_column_, current_character_row_;
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uint8_t last_pixel_byte_;
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bool is_blank_line_;
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// CRT output
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uint8_t *current_output_target_, *initial_output_target_;
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unsigned int current_output_divider_;
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std::shared_ptr<Outputs::CRT::CRT> crt_;
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};
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}
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#endif /* Video_hpp */
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