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143 lines
4.3 KiB
C++
143 lines
4.3 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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#include "DMADevice.hpp"
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namespace Amiga {
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class BlitterSequencer {
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public:
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enum class Channel {
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Write, C, B, A, None
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};
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void set_control(int control) {
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control_ = control;
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}
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void complete() {
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complete_ = true;
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}
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Channel next() {
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if(complete_ && !index_) {
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// TODO: this isn't quite right; some patterns leave a gap before
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// the final write, some don't. Figure this out.
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return Channel::Write;
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}
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Channel next = Channel::None;
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switch(control_) {
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default: break;
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case 1: next = next_channel(pattern1); break;
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case 2: next = next_channel(pattern2); break;
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case 3: next = next_channel(pattern3); break;
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case 4: next = next_channel(pattern4); break;
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case 5: next = next_channel(pattern5); break;
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case 6: next = next_channel(pattern6); break;
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case 7: next = next_channel(pattern7); break;
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case 8: next = next_channel(pattern8); break;
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case 9: next = next_channel(pattern9); break;
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case 10: next = next_channel(patternA); break;
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case 11: next = next_channel(patternB); break;
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case 12: next = next_channel(patternC); break;
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case 13: next = next_channel(patternD); break;
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case 14: next = next_channel(patternE); break;
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case 15: next = next_channel(patternF); break;
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}
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return next;
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}
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private:
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static constexpr std::array<Channel, 2> pattern1 = { Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern2 = { Channel::C, Channel::None };
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static constexpr std::array<Channel, 3> pattern3 = { Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern4 = { Channel::B, Channel::None, Channel::None };
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static constexpr std::array<Channel, 3> pattern5 = { Channel::B, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern6 = { Channel::B, Channel::C, Channel::None };
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static constexpr std::array<Channel, 4> pattern7 = { Channel::B, Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern8 = { Channel::A, Channel::None };
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static constexpr std::array<Channel, 2> pattern9 = { Channel::A, Channel::Write };
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static constexpr std::array<Channel, 2> patternA = { Channel::A, Channel::C };
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static constexpr std::array<Channel, 3> patternB = { Channel::A, Channel::C, Channel::Write };
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static constexpr std::array<Channel, 3> patternC = { Channel::A, Channel::B, Channel::None };
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static constexpr std::array<Channel, 3> patternD = { Channel::A, Channel::B, Channel::Write };
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static constexpr std::array<Channel, 3> patternE = { Channel::A, Channel::B, Channel::C };
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static constexpr std::array<Channel, 4> patternF = { Channel::A, Channel::B, Channel::C, Channel::Write };
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template <typename ArrayT> Channel next_channel(const ArrayT &list) {
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const Channel result = list[index_];
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index_ = (index_ + 1) % list.size();
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return result;
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}
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int control_ = 0;
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int index_ = 0;
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bool complete_ = false;
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};
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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_dma();
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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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