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341 lines
12 KiB
C++
341 lines
12 KiB
C++
//
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// Video.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "Video.hpp"
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using namespace Apple::II::Video;
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VideoBase::VideoBase(bool is_iie, std::function<void(Cycles)> &&target) :
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crt_(910, 1, Outputs::Display::Type::NTSC60, Outputs::Display::InputDataType::Luminance1),
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is_iie_(is_iie),
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deferrer_(std::move(target)) {
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// Show only the centre 75% of the TV frame.
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crt_.set_display_type(Outputs::Display::DisplayType::CompositeColour);
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crt_.set_visible_area(Outputs::Display::Rect(0.118f, 0.122f, 0.77f, 0.77f));
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// TODO: there seems to be some sort of bug whereby switching modes can cause
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// a signal discontinuity that knocks phase out of whack. So it isn't safe to
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// use default_colour_bursts elsewhere, though it otherwise should be. If/when
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// it is, start doing so and return to setting the immediate phase up here.
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// crt_.set_immediate_default_phase(0.5f);
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character_zones[0].xor_mask = 0;
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character_zones[0].address_mask = 0x3f;
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character_zones[1].xor_mask = 0;
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character_zones[1].address_mask = 0x3f;
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character_zones[2].xor_mask = 0;
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character_zones[2].address_mask = 0x3f;
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character_zones[3].xor_mask = 0;
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character_zones[3].address_mask = 0x3f;
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if(is_iie) {
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character_zones[0].xor_mask =
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character_zones[2].xor_mask =
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character_zones[3].xor_mask = 0xff;
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character_zones[2].address_mask =
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character_zones[3].address_mask = 0xff;
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}
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}
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void VideoBase::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
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crt_.set_scan_target(scan_target);
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}
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void VideoBase::set_display_type(Outputs::Display::DisplayType display_type) {
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crt_.set_display_type(display_type);
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}
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/*
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Rote setters and getters.
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*/
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void VideoBase::set_alternative_character_set(bool alternative_character_set) {
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set_alternative_character_set_ = alternative_character_set;
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deferrer_.defer(Cycles(2), [=] {
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alternative_character_set_ = alternative_character_set;
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if(alternative_character_set) {
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character_zones[1].address_mask = 0xff;
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character_zones[1].xor_mask = 0;
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} else {
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character_zones[1].address_mask = 0x3f;
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character_zones[1].xor_mask = flash_mask();
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}
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});
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}
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bool VideoBase::get_alternative_character_set() {
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return set_alternative_character_set_;
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}
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void VideoBase::set_80_columns(bool columns_80) {
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set_columns_80_ = columns_80;
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deferrer_.defer(Cycles(2), [=] {
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columns_80_ = columns_80;
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});
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}
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bool VideoBase::get_80_columns() {
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return set_columns_80_;
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}
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void VideoBase::set_80_store(bool store_80) {
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set_store_80_ = store_80_ = store_80;
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}
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bool VideoBase::get_80_store() {
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return set_store_80_;
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}
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void VideoBase::set_page2(bool page2) {
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set_page2_ = page2_ = page2;
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}
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bool VideoBase::get_page2() {
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return set_page2_;
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}
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void VideoBase::set_text(bool text) {
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set_text_ = text;
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deferrer_.defer(Cycles(2), [=] {
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text_ = text;
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});
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}
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bool VideoBase::get_text() {
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return set_text_;
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}
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void VideoBase::set_mixed(bool mixed) {
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set_mixed_ = mixed;
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deferrer_.defer(Cycles(2), [=] {
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mixed_ = mixed;
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});
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}
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bool VideoBase::get_mixed() {
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return set_mixed_;
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}
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void VideoBase::set_high_resolution(bool high_resolution) {
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set_high_resolution_ = high_resolution;
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deferrer_.defer(Cycles(2), [=] {
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high_resolution_ = high_resolution;
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});
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}
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bool VideoBase::get_high_resolution() {
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return set_high_resolution_;
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}
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void VideoBase::set_annunciator_3(bool annunciator_3) {
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set_annunciator_3_ = annunciator_3;
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deferrer_.defer(Cycles(2), [=] {
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annunciator_3_ = annunciator_3;
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high_resolution_mask_ = annunciator_3_ ? 0x7f : 0xff;
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});
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}
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bool VideoBase::get_annunciator_3() {
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return set_annunciator_3_;
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}
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void VideoBase::set_character_rom(const std::vector<uint8_t> &character_rom) {
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character_rom_ = character_rom;
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// Flip all character contents based on the second line of the $ graphic.
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if(character_rom_[0x121] == 0x3c || character_rom_[0x122] == 0x3c) {
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for(auto &graphic : character_rom_) {
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graphic =
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((graphic & 0x01) ? 0x40 : 0x00) |
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((graphic & 0x02) ? 0x20 : 0x00) |
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((graphic & 0x04) ? 0x10 : 0x00) |
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((graphic & 0x08) ? 0x08 : 0x00) |
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((graphic & 0x10) ? 0x04 : 0x00) |
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((graphic & 0x20) ? 0x02 : 0x00) |
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((graphic & 0x40) ? 0x01 : 0x00);
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}
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}
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}
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void VideoBase::output_text(uint8_t *target, const uint8_t *const source, size_t length, size_t pixel_row) const {
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for(size_t c = 0; c < length; ++c) {
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const int character = source[c] & character_zones[source[c] >> 6].address_mask;
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const uint8_t xor_mask = character_zones[source[c] >> 6].xor_mask;
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const std::size_t character_address = static_cast<std::size_t>(character << 3) + pixel_row;
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const uint8_t character_pattern = character_rom_[character_address] ^ xor_mask;
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = target[1] = character_pattern & 0x40;
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target[2] = target[3] = character_pattern & 0x20;
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target[4] = target[5] = character_pattern & 0x10;
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target[6] = target[7] = character_pattern & 0x08;
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target[8] = target[9] = character_pattern & 0x04;
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target[10] = target[11] = character_pattern & 0x02;
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target[12] = target[13] = character_pattern & 0x01;
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graphics_carry_ = character_pattern & 0x01;
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target += 14;
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}
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}
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void VideoBase::output_double_text(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length, size_t pixel_row) const {
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for(size_t c = 0; c < length; ++c) {
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const std::size_t character_addresses[2] = {
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static_cast<std::size_t>(
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(auxiliary_source[c] & character_zones[auxiliary_source[c] >> 6].address_mask) << 3
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) + pixel_row,
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static_cast<std::size_t>(
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(source[c] & character_zones[source[c] >> 6].address_mask) << 3
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) + pixel_row
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};
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const uint8_t character_patterns[2] = {
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static_cast<uint8_t>(
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character_rom_[character_addresses[0]] ^ character_zones[auxiliary_source[c] >> 6].xor_mask
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),
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static_cast<uint8_t>(
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character_rom_[character_addresses[1]] ^ character_zones[source[c] >> 6].xor_mask
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)
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};
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = character_patterns[0] & 0x40;
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target[1] = character_patterns[0] & 0x20;
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target[2] = character_patterns[0] & 0x10;
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target[3] = character_patterns[0] & 0x08;
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target[4] = character_patterns[0] & 0x04;
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target[5] = character_patterns[0] & 0x02;
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target[6] = character_patterns[0] & 0x01;
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target[7] = character_patterns[1] & 0x40;
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target[8] = character_patterns[1] & 0x20;
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target[9] = character_patterns[1] & 0x10;
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target[10] = character_patterns[1] & 0x08;
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target[11] = character_patterns[1] & 0x04;
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target[12] = character_patterns[1] & 0x02;
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target[13] = character_patterns[1] & 0x01;
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graphics_carry_ = character_patterns[1] & 0x01;
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target += 14;
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}
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}
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void VideoBase::output_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int column, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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// Low-resolution graphics mode shifts the colour code on a loop, but has to account for whether this
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// 14-sample output window is starting at the beginning of a colour cycle or halfway through.
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if((column + static_cast<int>(c))&1) {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 4;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 8;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 1;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 2;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 1;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 2;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 4;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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}
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void VideoBase::output_fat_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int column, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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// Fat low-resolution mode appears not to do anything to try to make odd and
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// even columns compatible.
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target[0] = target[1] = target[8] = target[9] = (source[c] >> row_shift) & 1;
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target[2] = target[3] = target[10] = target[11] = (source[c] >> row_shift) & 2;
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target[4] = target[5] = target[12] = target[13] = (source[c] >> row_shift) & 4;
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target[6] = target[7] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 4;
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target += 14;
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}
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}
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void VideoBase::output_double_low_resolution(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length, int column, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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if((column + static_cast<int>(c))&1) {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 2;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 4;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 8;
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target[3] = (auxiliary_source[c] >> row_shift) & 1;
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target[8] = target[12] = (source[c] >> row_shift) & 4;
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target[9] = target[13] = (source[c] >> row_shift) & 8;
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target[10] = (source[c] >> row_shift) & 1;
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target[7] = target[11] = (source[c] >> row_shift) & 2;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 8;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 1;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 2;
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target[3] = (auxiliary_source[c] >> row_shift) & 4;
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target[8] = target[12] = (source[c] >> row_shift) & 1;
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target[9] = target[13] = (source[c] >> row_shift) & 2;
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target[10] = (source[c] >> row_shift) & 4;
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target[7] = target[11] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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}
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void VideoBase::output_high_resolution(uint8_t *target, const uint8_t *const source, size_t length) const {
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for(size_t c = 0; c < length; ++c) {
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// High resolution graphics shift out LSB to MSB, optionally with a delay of half a pixel.
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// If there is a delay, the previous output level is held to bridge the gap.
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// Delays may be ignored on a IIe if Annunciator 3 is set; that's the state that
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// high_resolution_mask_ models.
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if(source[c] & high_resolution_mask_ & 0x80) {
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target[0] = graphics_carry_;
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target[1] = target[2] = source[c] & 0x01;
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target[3] = target[4] = source[c] & 0x02;
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target[5] = target[6] = source[c] & 0x04;
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target[7] = target[8] = source[c] & 0x08;
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target[9] = target[10] = source[c] & 0x10;
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target[11] = target[12] = source[c] & 0x20;
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target[13] = source[c] & 0x40;
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} else {
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target[0] = target[1] = source[c] & 0x01;
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target[2] = target[3] = source[c] & 0x02;
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target[4] = target[5] = source[c] & 0x04;
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target[6] = target[7] = source[c] & 0x08;
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target[8] = target[9] = source[c] & 0x10;
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target[10] = target[11] = source[c] & 0x20;
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target[12] = target[13] = source[c] & 0x40;
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}
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graphics_carry_ = source[c] & 0x40;
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target += 14;
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}
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}
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void VideoBase::output_double_high_resolution(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length) const {
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for(size_t c = 0; c < length; ++c) {
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target[0] = auxiliary_source[c] & 0x01;
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target[1] = auxiliary_source[c] & 0x02;
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target[2] = auxiliary_source[c] & 0x04;
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target[3] = auxiliary_source[c] & 0x08;
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target[4] = auxiliary_source[c] & 0x10;
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target[5] = auxiliary_source[c] & 0x20;
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target[6] = auxiliary_source[c] & 0x40;
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target[7] = source[c] & 0x01;
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target[8] = source[c] & 0x02;
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target[9] = source[c] & 0x04;
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target[10] = source[c] & 0x08;
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target[11] = source[c] & 0x10;
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target[12] = source[c] & 0x20;
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target[13] = source[c] & 0x40;
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graphics_carry_ = auxiliary_source[c] & 0x40;
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target += 14;
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}
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}
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