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102 lines
2.2 KiB
C++
102 lines
2.2 KiB
C++
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//
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// 9918Base.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/12/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef TMS9918Base_hpp
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#define TMS9918Base_hpp
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#include "../../../Outputs/CRT/CRT.hpp"
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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#include <cstdint>
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#include <memory>
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namespace TI {
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class TMS9918Base {
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protected:
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TMS9918Base();
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std::shared_ptr<Outputs::CRT::CRT> crt_;
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uint8_t ram_[16384];
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uint16_t ram_pointer_ = 0;
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uint8_t read_ahead_buffer_ = 0;
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enum class MemoryAccess {
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Read, Write, None
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} queued_access_ = MemoryAccess::None;
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uint8_t status_ = 0;
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bool write_phase_ = false;
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uint8_t low_write_ = 0;
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// The various register flags.
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int next_screen_mode_ = 0, screen_mode_ = 0;
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bool next_blank_screen_ = true, blank_screen_ = true;
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bool sprites_16x16_ = false;
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bool sprites_magnified_ = false;
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bool generate_interrupts_ = false;
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int sprite_height_ = 8;
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uint16_t pattern_name_address_ = 0;
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uint16_t colour_table_address_ = 0;
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uint16_t pattern_generator_table_address_ = 0;
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uint16_t sprite_attribute_table_address_ = 0;
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uint16_t sprite_generator_table_address_ = 0;
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uint8_t text_colour_ = 0;
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uint8_t background_colour_ = 0;
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HalfCycles half_cycles_into_frame_;
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int column_ = 0, row_ = 0, output_column_ = 0;
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int cycles_error_ = 0;
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uint32_t *pixel_target_ = nullptr, *pixel_base_ = nullptr;
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void output_border(int cycles);
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// Vertical timing details.
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int frame_lines_ = 262;
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int first_vsync_line_ = 227;
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// Horizontal selections.
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enum class LineMode {
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Text = 0,
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Character = 1,
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Refresh = 2
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} line_mode_ = LineMode::Text;
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int first_pixel_column_, first_right_border_column_;
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uint8_t pattern_names_[40];
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uint8_t pattern_buffer_[40];
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uint8_t colour_buffer_[40];
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struct SpriteSet {
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struct ActiveSprite {
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int index = 0;
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int row = 0;
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uint8_t info[4];
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uint8_t image[2];
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int shift_position = 0;
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} active_sprites[4];
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int active_sprite_slot = 0;
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} sprite_sets_[2];
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int active_sprite_set_ = 0;
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bool sprites_stopped_ = false;
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int access_pointer_ = 0;
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inline void test_sprite(int sprite_number);
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inline void get_sprite_contents(int start, int cycles, int screen_row);
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};
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}
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#endif /* TMS9918Base_hpp */
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