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70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
//
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// Blitter.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 22/07/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef Blitter_hpp
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#define Blitter_hpp
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#include <cstddef>
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#include <cstdint>
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#include "../../ClockReceiver/ClockReceiver.hpp"
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#include "DMADevice.hpp"
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namespace Amiga {
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class Blitter: public DMADevice<4, 4> {
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public:
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using DMADevice::DMADevice;
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// Various setters; it's assumed that address decoding is handled externally.
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//
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// In all cases where a channel is identified numerically, it's taken that
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// 0 = A, 1 = B, 2 = C, 3 = D.
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void set_control(int index, uint16_t value);
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void set_first_word_mask(uint16_t value);
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void set_last_word_mask(uint16_t value);
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void set_size(uint16_t value);
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void set_minterms(uint16_t value);
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void set_vertical_size(uint16_t value);
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void set_horizontal_size(uint16_t value);
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void set_data(int channel, uint16_t value);
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uint16_t get_status();
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bool advance();
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private:
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int width_ = 0, height_ = 0;
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int shifts_[2]{};
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uint16_t a_mask_[2] = {0xffff, 0xffff};
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bool line_mode_ = false;
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bool one_dot_ = false;
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int line_direction_ = 0;
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int line_sign_ = 1;
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uint32_t direction_ = 1;
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bool inclusive_fill_ = false;
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bool exclusive_fill_ = false;
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bool fill_carry_ = false;
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bool channel_enables_[4]{};
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uint8_t minterms_ = 0;
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uint32_t a32_ = 0, b32_ = 0;
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uint16_t a_data_ = 0, b_data_ = 0, c_data_ = 0;
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bool not_zero_flag_ = false;
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};
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}
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#endif /* Blitter_hpp */
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