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56 lines
1.3 KiB
C++
56 lines
1.3 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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namespace Amiga {
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class Blitter {
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public:
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Blitter(uint16_t *ram, size_t size);
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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_pointer(int channel, int shift, 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_modulo(int channel, 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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/// @returns The number of 'cycles' required to complete the current
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/// operation, if any, or Cycles(0) if no operation is pending.
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Cycles get_remaining_cycles();
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/// Advances the stated number of cycles.
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void run_for(Cycles);
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private:
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uint16_t *const ram_;
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const size_t ram_size_;
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};
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}
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#endif /* Blitter_hpp */
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