mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-23 03:32:32 +00:00
110 lines
2.2 KiB
C++
110 lines
2.2 KiB
C++
//
|
|
// Video.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 04/10/2019.
|
|
// Copyright © 2019 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef Atari_ST_Video_hpp
|
|
#define Atari_ST_Video_hpp
|
|
|
|
#include "../../Outputs/CRT/CRT.hpp"
|
|
#include "../../ClockReceiver/ClockReceiver.hpp"
|
|
|
|
namespace Atari {
|
|
namespace ST {
|
|
|
|
enum class FieldFrequency {
|
|
Fifty = 0, Sixty = 1, SeventyTwo = 2
|
|
};
|
|
|
|
class Video {
|
|
public:
|
|
Video();
|
|
|
|
/*!
|
|
Sets the target device for video data.
|
|
*/
|
|
void set_scan_target(Outputs::Display::ScanTarget *scan_target);
|
|
|
|
/*!
|
|
Produces the next @c duration period of pixels.
|
|
*/
|
|
void run_for(HalfCycles duration);
|
|
|
|
/*!
|
|
@returns the number of cycles until there is next a change in the hsync,
|
|
vsync or display_enable outputs.
|
|
*/
|
|
HalfCycles get_next_sequence_point();
|
|
|
|
bool hblank();
|
|
bool vsync();
|
|
bool display_enabled();
|
|
|
|
void set_ram(uint16_t *, size_t size);
|
|
|
|
uint16_t read(int address);
|
|
void write(int address, uint16_t value);
|
|
|
|
private:
|
|
Outputs::CRT::CRT crt_;
|
|
|
|
uint16_t palette_[16];
|
|
int base_address_ = 0;
|
|
int current_address_ = 0;
|
|
|
|
uint16_t *ram_;
|
|
uint16_t line_buffer_[256];
|
|
|
|
int x = 0, y = 0;
|
|
void output_border(int duration);
|
|
|
|
uint16_t video_mode_ = 0;
|
|
uint16_t sync_mode_ = 0;
|
|
|
|
FieldFrequency field_frequency_ = FieldFrequency::Fifty;
|
|
enum class OutputBpp {
|
|
One, Two, Four
|
|
} output_bpp_;
|
|
void update_output_mode();
|
|
|
|
struct State {
|
|
bool enable = false;
|
|
bool blank = false;
|
|
bool sync = false;
|
|
} horizontal_, vertical_;
|
|
int line_length_ = 512;
|
|
|
|
int data_latch_position_ = 0;
|
|
uint16_t data_latch_[4];
|
|
union {
|
|
uint64_t output_shifter_;
|
|
uint32_t shifter_halves_[2];
|
|
};
|
|
void shift_out(int length);
|
|
void latch_word();
|
|
|
|
struct PixelBufferState {
|
|
uint16_t *pixel_pointer;
|
|
int pixels_output = 0;
|
|
int cycles_output = 0;
|
|
OutputBpp output_bpp;
|
|
void flush(Outputs::CRT::CRT &crt) {
|
|
if(cycles_output) crt.output_data(cycles_output, size_t(pixels_output));
|
|
pixels_output = cycles_output = 0;
|
|
pixel_pointer = nullptr;
|
|
}
|
|
void allocate(Outputs::CRT::CRT &crt) {
|
|
flush(crt);
|
|
pixel_pointer = reinterpret_cast<uint16_t *>(crt.begin_data(328));
|
|
}
|
|
} pixel_buffer_;
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* Atari_ST_Video_hpp */
|