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127 lines
2.6 KiB
C++
127 lines
2.6 KiB
C++
//
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// Video.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/10/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#ifndef Atari_ST_Video_hpp
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#define Atari_ST_Video_hpp
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#include "../../../Outputs/CRT/CRT.hpp"
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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namespace Atari {
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namespace ST {
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enum class FieldFrequency {
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Fifty = 0, Sixty = 1, SeventyTwo = 2
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};
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class Video {
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public:
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Video();
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/*!
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Sets the target device for video data.
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*/
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void set_scan_target(Outputs::Display::ScanTarget *scan_target);
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/*!
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Produces the next @c duration period of pixels.
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*/
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void run_for(HalfCycles duration);
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/*!
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@returns the number of cycles until there is next a change in the hsync,
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vsync or display_enable outputs.
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*/
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HalfCycles get_next_sequence_point();
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bool hsync();
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bool vsync();
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bool display_enabled();
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void set_ram(uint16_t *, size_t size);
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uint16_t read(int address);
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void write(int address, uint16_t value);
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private:
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Outputs::CRT::CRT crt_;
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uint16_t raw_palette_[16];
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uint16_t palette_[16];
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int base_address_ = 0;
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int current_address_ = 0;
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uint16_t *ram_;
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uint16_t line_buffer_[256];
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int x_ = 0, y_ = 0, next_y_ = 0;
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void output_border(int duration);
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uint16_t video_mode_ = 0;
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uint16_t sync_mode_ = 0;
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FieldFrequency field_frequency_ = FieldFrequency::Fifty;
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enum class OutputBpp {
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One, Two, Four
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} output_bpp_;
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void update_output_mode();
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struct HorizontalState {
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bool enable = false;
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bool blank = false;
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bool sync = false;
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} horizontal_;
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struct VerticalState {
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bool enable = false;
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bool blank = false;
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enum class SyncSchedule {
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/// No sync events this line.
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None,
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/// Sync should begin during this horizontal line.
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Begin,
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/// Sync should end during this horizontal line.
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End,
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} sync_schedule = SyncSchedule::None;
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bool sync = false;
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} vertical_, next_vertical_;
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int line_length_ = 1024;
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int data_latch_position_ = 0;
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uint16_t data_latch_[4];
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union {
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uint64_t output_shifter_;
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uint32_t shifter_halves_[2];
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};
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void shift_out(int length);
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void latch_word();
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struct PixelBufferState {
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uint16_t *pixel_pointer;
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int pixels_output = 0;
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int cycles_output = 0;
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OutputBpp output_bpp;
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void flush(Outputs::CRT::CRT &crt) {
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if(cycles_output) {
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crt.output_data(cycles_output, size_t(pixels_output));
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pixels_output = cycles_output = 0;
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pixel_pointer = nullptr;
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}
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}
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void allocate(Outputs::CRT::CRT &crt) {
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flush(crt);
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pixel_pointer = reinterpret_cast<uint16_t *>(crt.begin_data(320 + 32));
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}
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} pixel_buffer_;
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};
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}
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}
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#endif /* Atari_ST_Video_hpp */
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