mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 23:52:26 +00:00
70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
//
|
|
// Blitter.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 22/07/2021.
|
|
// Copyright © 2021 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef Blitter_hpp
|
|
#define Blitter_hpp
|
|
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
|
|
#include "../../ClockReceiver/ClockReceiver.hpp"
|
|
#include "DMADevice.hpp"
|
|
|
|
namespace Amiga {
|
|
|
|
class Blitter: public DMADevice<4, 4> {
|
|
public:
|
|
using DMADevice::DMADevice;
|
|
|
|
// Various setters; it's assumed that address decoding is handled externally.
|
|
//
|
|
// In all cases where a channel is identified numerically, it's taken that
|
|
// 0 = A, 1 = B, 2 = C, 3 = D.
|
|
void set_control(int index, uint16_t value);
|
|
void set_first_word_mask(uint16_t value);
|
|
void set_last_word_mask(uint16_t value);
|
|
|
|
void set_size(uint16_t value);
|
|
void set_minterms(uint16_t value);
|
|
// void set_vertical_size(uint16_t value);
|
|
// void set_horizontal_size(uint16_t value);
|
|
void set_data(int channel, uint16_t value);
|
|
|
|
uint16_t get_status();
|
|
|
|
bool advance_dma();
|
|
|
|
private:
|
|
int width_ = 0, height_ = 0;
|
|
int shifts_[2]{};
|
|
uint16_t a_mask_[2] = {0xffff, 0xffff};
|
|
|
|
bool line_mode_ = false;
|
|
bool one_dot_ = false;
|
|
int line_direction_ = 0;
|
|
int line_sign_ = 1;
|
|
|
|
uint32_t direction_ = 1;
|
|
bool inclusive_fill_ = false;
|
|
bool exclusive_fill_ = false;
|
|
bool fill_carry_ = false;
|
|
|
|
bool channel_enables_[4]{};
|
|
|
|
uint8_t minterms_ = 0;
|
|
uint32_t a32_ = 0, b32_ = 0;
|
|
uint16_t a_data_ = 0, b_data_ = 0, c_data_ = 0;
|
|
|
|
bool not_zero_flag_ = false;
|
|
};
|
|
|
|
}
|
|
|
|
|
|
#endif /* Blitter_hpp */
|