mirror of
https://github.com/TomHarte/CLK.git
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Factors out the Apple II/IIe video switches and mode selection logic.
This commit is contained in:
Thomas Harte
parent
e8943618dc
commit
1b28d929e4
@ -11,9 +11,9 @@
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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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VideoSwitches<Cycles>(Cycles(2), std::move(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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is_iie_(is_iie) {
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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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@ -59,97 +59,20 @@ Outputs::Display::DisplayType VideoBase::get_display_type() const {
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return crt_.get_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), [this, alternative_character_set] {
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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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void VideoBase::did_set_alternative_character_set(bool alternative_character_set) {
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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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// The XOR mask is seeded here; it's dynamic, so updated elsewhere.
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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), [this, columns_80] {
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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), [this, text] {
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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), [this, mixed] {
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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), [this, high_resolution] {
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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), [this, annunciator_3] {
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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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void VideoBase::did_set_annunciator_3(bool annunciator_3) {
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high_resolution_mask_ = annunciator_3 ? 0x7f : 0xff;
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}
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void VideoBase::set_character_rom(const std::vector<uint8_t> &character_rom) {
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@ -13,6 +13,8 @@
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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#include "../../../ClockReceiver/DeferredQueue.hpp"
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#include "VideoSwitches.hpp"
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#include <array>
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#include <vector>
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@ -33,7 +35,7 @@ class BusHandler {
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}
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};
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class VideoBase {
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class VideoBase: public VideoSwitches<Cycles> {
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public:
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VideoBase(bool is_iie, std::function<void(Cycles)> &&target);
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@ -49,109 +51,6 @@ class VideoBase {
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/// Gets the type of output.
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Outputs::Display::DisplayType get_display_type() const;
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/*
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Descriptions for the setters below are taken verbatim from
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the Apple IIe Technical Reference. Addresses are the conventional
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locations within the Apple II memory map. Only those which affect
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video output are implemented here.
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Those registers which don't exist on a II/II+ are marked.
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*/
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/*!
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Setter for ALTCHAR ($C00E/$C00F; triggers on write only):
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* Off: display text using primary character set.
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* On: display text using alternate character set.
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Doesn't exist on a II/II+.
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*/
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void set_alternative_character_set(bool);
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bool get_alternative_character_set();
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/*!
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Setter for 80COL ($C00C/$C00D; triggers on write only).
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* Off: display 40 columns.
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* On: display 80 columns.
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Doesn't exist on a II/II+.
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*/
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void set_80_columns(bool);
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bool get_80_columns();
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/*!
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Setter for 80STORE ($C000/$C001; triggers on write only).
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* Off: cause PAGE2 to select auxiliary RAM.
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* On: cause PAGE2 to switch main RAM areas.
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Doesn't exist on a II/II+.
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*/
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void set_80_store(bool);
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bool get_80_store();
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/*!
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Setter for PAGE2 ($C054/$C055; triggers on read or write).
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* Off: select Page 1.
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* On: select Page 2 or, if 80STORE on, Page 1 in auxiliary memory.
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80STORE doesn't exist on a II/II+; therefore this always selects
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either Page 1 or Page 2 on those machines.
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*/
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void set_page2(bool);
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bool get_page2();
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/*!
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Setter for TEXT ($C050/$C051; triggers on read or write).
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* Off: display graphics or, if MIXED on, mixed.
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* On: display text.
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*/
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void set_text(bool);
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bool get_text();
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/*!
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Setter for MIXED ($C052/$C053; triggers on read or write).
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* Off: display only text or only graphics.
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* On: if TEXT off, display text and graphics.
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*/
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void set_mixed(bool);
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bool get_mixed();
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/*!
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Setter for HIRES ($C056/$C057; triggers on read or write).
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* Off: if TEXT off, display low-resolution graphics.
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* On: if TEXT off, display high-resolution or, if DHIRES on, double high-resolution graphics.
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DHIRES doesn't exist on a II/II+; therefore this always selects
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either high- or low-resolution graphics on those machines.
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Despite Apple's documentation, the IIe also supports double low-resolution
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graphics, which are the 80-column analogue to ordinary low-resolution 40-column
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low-resolution graphics.
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*/
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void set_high_resolution(bool);
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bool get_high_resolution();
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/*!
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Setter for annunciator 3.
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* On: turn on annunciator 3.
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* Off: turn off annunciator 3.
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This exists on both the II/II+ and the IIe, but has no effect on
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video on the older machines. It's intended to be used on the IIe
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to confirm double-high resolution mode but has side effects in
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selecting mixed mode output and discarding high-resolution
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delay bits.
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*/
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void set_annunciator_3(bool);
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bool get_annunciator_3();
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// Setup for text mode.
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void set_character_rom(const std::vector<uint8_t> &);
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@ -167,28 +66,9 @@ class VideoBase {
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return uint8_t((flash_ / flash_length) * 0xff);
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}
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// Enumerates all Apple II and IIe display modes.
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enum class GraphicsMode {
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Text = 0,
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DoubleText,
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HighRes,
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DoubleHighRes,
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LowRes,
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DoubleLowRes,
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FatLowRes
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};
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bool is_text_mode(GraphicsMode m) { return m <= GraphicsMode::DoubleText; }
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bool is_double_mode(GraphicsMode m) { return !!(int(m)&1); }
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// Various soft-switch values.
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bool alternative_character_set_ = false, set_alternative_character_set_ = false;
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bool columns_80_ = false, set_columns_80_ = false;
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bool store_80_ = false, set_store_80_ = false;
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bool page2_ = false, set_page2_ = false;
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bool text_ = true, set_text_ = true;
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bool mixed_ = false, set_mixed_ = false;
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bool high_resolution_ = false, set_high_resolution_ = false;
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bool annunciator_3_ = false, set_annunciator_3_ = false;
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bool alternative_character_set_ = false;
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void did_set_annunciator_3(bool) override;
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void did_set_alternative_character_set(bool) override;
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// Graphics carry is the final level output in a fetch window;
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// it carries on into the next if it's high resolution with
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@ -208,7 +88,7 @@ class VideoBase {
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std::array<uint8_t, 40> base_stream_;
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std::array<uint8_t, 40> auxiliary_stream_;
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bool is_iie_ = false;
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const bool is_iie_ = false;
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static constexpr int flash_length = 8406;
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// Describes the current text mode mapping from in-memory character index
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@ -256,9 +136,6 @@ class VideoBase {
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clock rather than the 14M.
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*/
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void output_fat_low_resolution(uint8_t *target, const uint8_t *source, size_t length, int column, int row) const;
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// Maintain a DeferredQueue for delayed mode switches.
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DeferredQueuePerformer<Cycles> deferrer_;
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};
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template <class BusHandler, bool is_iie> class Video: public VideoBase {
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@ -268,13 +145,6 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
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VideoBase(is_iie, [this] (Cycles cycles) { advance(cycles); }),
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bus_handler_(bus_handler) {}
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/*!
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Runs video for @c cycles.
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*/
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void run_for(Cycles cycles) {
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deferrer_.run_for(cycles);
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}
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/*!
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Obtains the last value the video read prior to time now+offset.
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*/
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@ -345,7 +215,7 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
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A frame is oriented around 65 cycles across, 262 lines down.
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*/
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constexpr int first_sync_line = 220; // A complete guess. Information needed.
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constexpr int first_sync_line = 220; // A complete guess. Information needed.
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constexpr int first_sync_column = 49; // Also a guess.
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constexpr int sync_length = 4; // One of the two likely candidates.
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@ -422,7 +292,7 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
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const int pixel_end = std::min(40, ending_column);
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const int pixel_row = row_ & 7;
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const bool is_double = Video::is_double_mode(line_mode);
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const bool is_double = is_double_mode(line_mode);
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if(!is_double && was_double_ && pixel_pointer_) {
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pixel_pointer_[pixel_start*14 + 0] =
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pixel_pointer_[pixel_start*14 + 1] =
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@ -585,35 +455,6 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
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}
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}
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GraphicsMode graphics_mode(int row) {
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if(
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text_ ||
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(mixed_ && row >= 160 && row < 192)
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) return columns_80_ ? GraphicsMode::DoubleText : GraphicsMode::Text;
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if(high_resolution_) {
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return (annunciator_3_ && columns_80_) ? GraphicsMode::DoubleHighRes : GraphicsMode::HighRes;
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} else {
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if(columns_80_) return GraphicsMode::DoubleLowRes;
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if(annunciator_3_) return GraphicsMode::FatLowRes;
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return GraphicsMode::LowRes;
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}
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}
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int video_page() {
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return (store_80_ || !page2_) ? 0 : 1;
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}
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uint16_t get_row_address(int row) {
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const int character_row = row >> 3;
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const int pixel_row = row & 7;
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const uint16_t row_address = uint16_t((character_row >> 3) * 40 + ((character_row&7) << 7));
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const GraphicsMode pixel_mode = graphics_mode(row);
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return ((pixel_mode == GraphicsMode::HighRes) || (pixel_mode == GraphicsMode::DoubleHighRes)) ?
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uint16_t(((video_page()+1) * 0x2000) + row_address + ((pixel_row&7) << 10)) :
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uint16_t(((video_page()+1) * 0x400) + row_address);
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}
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BusHandler &bus_handler_;
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};
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254
Machines/Apple/AppleII/VideoSwitches.hpp
Normal file
254
Machines/Apple/AppleII/VideoSwitches.hpp
Normal file
@ -0,0 +1,254 @@
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//
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// VideoSwitches.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 31/10/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#ifndef VideoSwitches_h
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#define VideoSwitches_h
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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#include "../../../ClockReceiver/DeferredQueue.hpp"
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namespace Apple {
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namespace II {
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// Enumerates all Apple II, IIe and IIgs display modes.
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enum class GraphicsMode {
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Text = 0,
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DoubleText,
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HighRes,
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DoubleHighRes,
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LowRes,
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DoubleLowRes,
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FatLowRes
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};
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constexpr bool is_text_mode(GraphicsMode m) { return m <= GraphicsMode::DoubleText; }
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constexpr bool is_double_mode(GraphicsMode m) { return int(m) & 1; }
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template <typename TimeUnit> class VideoSwitches {
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public:
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/*!
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Constructs a new instance of VideoSwitches in which changes to the switch
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affect the video mode only after @c delay cycles.
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*/
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VideoSwitches(TimeUnit delay, std::function<void(TimeUnit)> &&target) : delay_(delay), deferrer_(std::move(target)) {}
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/*!
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Advances @c cycles.
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*/
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void run_for(TimeUnit cycles) {
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deferrer_.run_for(cycles);
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}
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/*
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Descriptions for the setters below are taken verbatim from
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the Apple IIe Technical Reference. Addresses are the conventional
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locations within the Apple II memory map. Only those which affect
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video output are implemented here.
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Those registers which don't exist on a II/II+ are marked.
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*/
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/*!
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Setter for ALTCHAR ($C00E/$C00F; triggers on write only):
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* Off: display text using primary character set.
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* On: display text using alternate character set.
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Doesn't exist on a II/II+.
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*/
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void set_alternative_character_set(bool alternative_character_set) {
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external_.alternative_character_set = alternative_character_set;
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deferrer_.defer(delay_, [this, alternative_character_set] {
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internal_.alternative_character_set = alternative_character_set;
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did_set_annunciator_3(alternative_character_set);
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});
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}
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bool get_alternative_character_set() const {
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return external_.alternative_character_set;
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}
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/*!
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Setter for 80COL ($C00C/$C00D; triggers on write only).
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* Off: display 40 columns.
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* On: display 80 columns.
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Doesn't exist on a II/II+.
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*/
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void set_80_columns(bool columns_80) {
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external_.columns_80 = columns_80;
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deferrer_.defer(delay_, [this, columns_80] {
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internal_.columns_80 = columns_80;
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});
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}
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bool get_80_columns() const {
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return external_.columns_80;
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}
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/*!
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Setter for 80STORE ($C000/$C001; triggers on write only).
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* Off: cause PAGE2 to select auxiliary RAM.
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* On: cause PAGE2 to switch main RAM areas.
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Doesn't exist on a II/II+.
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*/
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void set_80_store(bool store_80) {
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external_.store_80 = internal_.store_80 = store_80;
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}
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bool get_80_store() const {
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return external_.store_80;
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}
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/*!
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Setter for PAGE2 ($C054/$C055; triggers on read or write).
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* Off: select Page 1.
|
||||
* On: select Page 2 or, if 80STORE on, Page 1 in auxiliary memory.
|
||||
|
||||
80STORE doesn't exist on a II/II+; therefore this always selects
|
||||
either Page 1 or Page 2 on those machines.
|
||||
*/
|
||||
void set_page2(bool page2) {
|
||||
external_.page2 = internal_.page2 = page2;
|
||||
}
|
||||
bool get_page2() const {
|
||||
return external_.page2;
|
||||
}
|
||||
|
||||
/*!
|
||||
Setter for TEXT ($C050/$C051; triggers on read or write).
|
||||
|
||||
* Off: display graphics or, if MIXED on, mixed.
|
||||
* On: display text.
|
||||
*/
|
||||
void set_text(bool text) {
|
||||
external_.text = text;
|
||||
deferrer_.defer(delay_, [this, text] {
|
||||
internal_.text = text;
|
||||
});
|
||||
}
|
||||
bool get_text() const {
|
||||
return external_.text;
|
||||
}
|
||||
|
||||
/*!
|
||||
Setter for MIXED ($C052/$C053; triggers on read or write).
|
||||
|
||||
* Off: display only text or only graphics.
|
||||
* On: if TEXT off, display text and graphics.
|
||||
*/
|
||||
void set_mixed(bool mixed) {
|
||||
external_.mixed = mixed;
|
||||
deferrer_.defer(delay_, [this, mixed] {
|
||||
internal_.mixed = mixed;
|
||||
});
|
||||
}
|
||||
bool get_mixed() const {
|
||||
return external_.mixed;
|
||||
}
|
||||
|
||||
/*!
|
||||
Setter for HIRES ($C056/$C057; triggers on read or write).
|
||||
|
||||
* Off: if TEXT off, display low-resolution graphics.
|
||||
* On: if TEXT off, display high-resolution or, if DHIRES on, double high-resolution graphics.
|
||||
|
||||
DHIRES doesn't exist on a II/II+; therefore this always selects
|
||||
either high- or low-resolution graphics on those machines.
|
||||
|
||||
Despite Apple's documentation, the IIe also supports double low-resolution
|
||||
graphics, which are the 80-column analogue to ordinary low-resolution 40-column
|
||||
low-resolution graphics.
|
||||
*/
|
||||
void set_high_resolution(bool high_resolution) {
|
||||
external_.high_resolution = high_resolution;
|
||||
deferrer_.defer(delay_, [this, high_resolution] {
|
||||
internal_.high_resolution = high_resolution;
|
||||
});
|
||||
}
|
||||
bool get_high_resolution() const {
|
||||
return external_.high_resolution;
|
||||
}
|
||||
|
||||
/*!
|
||||
Setter for annunciator 3.
|
||||
|
||||
* On: turn on annunciator 3.
|
||||
* Off: turn off annunciator 3.
|
||||
|
||||
This exists on both the II/II+ and the IIe, but has no effect on
|
||||
video on the older machines. It's intended to be used on the IIe
|
||||
to confirm double-high resolution mode but has side effects in
|
||||
selecting mixed mode output and discarding high-resolution
|
||||
delay bits.
|
||||
*/
|
||||
void set_annunciator_3(bool annunciator_3) {
|
||||
external_.annunciator_3 = annunciator_3;
|
||||
deferrer_.defer(delay_, [this, annunciator_3] {
|
||||
internal_.annunciator_3 = annunciator_3;
|
||||
did_set_alternative_character_set(annunciator_3);
|
||||
});
|
||||
}
|
||||
bool get_annunciator_3() const {
|
||||
return external_.annunciator_3;
|
||||
}
|
||||
|
||||
protected:
|
||||
GraphicsMode graphics_mode(int row) const {
|
||||
if(
|
||||
internal_.text ||
|
||||
(internal_.mixed && row >= 160 && row < 192)
|
||||
) return internal_.columns_80 ? GraphicsMode::DoubleText : GraphicsMode::Text;
|
||||
if(internal_.high_resolution) {
|
||||
return (internal_.annunciator_3 && internal_.columns_80) ? GraphicsMode::DoubleHighRes : GraphicsMode::HighRes;
|
||||
} else {
|
||||
if(internal_.columns_80) return GraphicsMode::DoubleLowRes;
|
||||
if(internal_.annunciator_3) return GraphicsMode::FatLowRes;
|
||||
return GraphicsMode::LowRes;
|
||||
}
|
||||
}
|
||||
|
||||
int video_page() const {
|
||||
return (internal_.store_80 || !internal_.page2) ? 0 : 1;
|
||||
}
|
||||
|
||||
uint16_t get_row_address(int row) const {
|
||||
const int character_row = row >> 3;
|
||||
const int pixel_row = row & 7;
|
||||
const uint16_t row_address = uint16_t((character_row >> 3) * 40 + ((character_row&7) << 7));
|
||||
|
||||
const GraphicsMode pixel_mode = graphics_mode(row);
|
||||
return ((pixel_mode == GraphicsMode::HighRes) || (pixel_mode == GraphicsMode::DoubleHighRes)) ?
|
||||
uint16_t(((video_page()+1) * 0x2000) + row_address + ((pixel_row&7) << 10)) :
|
||||
uint16_t(((video_page()+1) * 0x400) + row_address);
|
||||
}
|
||||
|
||||
virtual void did_set_annunciator_3(bool) = 0;
|
||||
virtual void did_set_alternative_character_set(bool) = 0;
|
||||
|
||||
private:
|
||||
// Maintain a DeferredQueue for delayed mode switches.
|
||||
const TimeUnit delay_;
|
||||
DeferredQueuePerformer<TimeUnit> deferrer_;
|
||||
|
||||
struct Switches {
|
||||
bool alternative_character_set = false;
|
||||
bool columns_80 = false;
|
||||
bool store_80 = false;
|
||||
bool page2 = false;
|
||||
bool text = true;
|
||||
bool mixed = false;
|
||||
bool high_resolution = false;
|
||||
bool annunciator_3 = false;
|
||||
} external_, internal_;
|
||||
};
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* VideoSwitches_h */
|
||||
@ -1315,6 +1315,7 @@
|
||||
4B8DF4D62546561300F3433C /* MemoryMap.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = MemoryMap.hpp; sourceTree = "<group>"; };
|
||||
4B8DF4D725465B7500F3433C /* IIgsMemoryMapTests.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = IIgsMemoryMapTests.mm; sourceTree = "<group>"; };
|
||||
4B8DF4ED254B840B00F3433C /* AppleClock.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = AppleClock.hpp; sourceTree = "<group>"; };
|
||||
4B8DF4F2254E141700F3433C /* VideoSwitches.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = VideoSwitches.hpp; sourceTree = "<group>"; };
|
||||
4B8E4ECD1DCE483D003716C3 /* KeyboardMachine.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = KeyboardMachine.hpp; sourceTree = "<group>"; };
|
||||
4B8EF6071FE5AF830076CCDD /* LowpassSpeaker.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = LowpassSpeaker.hpp; sourceTree = "<group>"; };
|
||||
4B8FE2141DA19D5F0090D3CE /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = "Clock Signal/Base.lproj/Atari2600Options.xib"; sourceTree = SOURCE_ROOT; };
|
||||
@ -3761,6 +3762,7 @@
|
||||
4BCE004C227CE8CA000CA200 /* DiskIICard.hpp */,
|
||||
4BF40A5525424C770033EA39 /* LanguageCardSwitches.hpp */,
|
||||
4BCE004F227CE8CA000CA200 /* Video.hpp */,
|
||||
4B8DF4F2254E141700F3433C /* VideoSwitches.hpp */,
|
||||
);
|
||||
path = AppleII;
|
||||
sourceTree = "<group>";
|
||||
|
||||
Loading…
Reference in New Issue
Block a user