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59 lines
1.3 KiB
C++
59 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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template <int id, int shift> void set_pointer(uint16_t value) {
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addresses_[id] = (addresses_[id] & (0xffff'0000 >> shift)) | uint32_t(value << shift);
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}
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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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bool advance();
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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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uint32_t addresses_[4];
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uint8_t minterms_;
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int width_ = 0, height_ = 0;
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};
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}
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#endif /* Blitter_hpp */
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