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[Mostly] unifies deferral process.

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This commit is contained in:
Thomas Harte 2020-01-29 22:46:08 -05:00
parent f9ce50d2bb
commit ce28213a5e
2 changed files with 26 additions and 87 deletions
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57
Machines/Atari/ST/Video.cpp
View File

@ -119,7 +119,6 @@ const int vsync_delay_period = hsync_delay_period; // Signal vsync with the same
}
Video::Video() :
deferrer_([=] (HalfCycles duration) { advance(duration); }),
crt_(2048, 2, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Red4Green4Blue4),
// crt_(896, 1, 500, Outputs::Display::ColourSpace::YIQ, 100, 50, 5, false, Outputs::Display::InputDataType::Red4Green4Blue4),
video_stream_(crt_, palette_) {
@ -146,18 +145,23 @@ void Video::set_display_type(Outputs::Display::DisplayType display_type) {
}
void Video::run_for(HalfCycles duration) {
deferrer_.run_for(duration);
}
void Video::advance(HalfCycles duration) {
const auto horizontal_timings = horizontal_parameters(field_frequency_);
const auto vertical_timings = vertical_parameters(field_frequency_);
int integer_duration = int(duration.as_integral());
assert(integer_duration >= 0);
while(integer_duration) {
const auto horizontal_timings = horizontal_parameters(field_frequency_);
const auto vertical_timings = vertical_parameters(field_frequency_);
// Determine time to next event; this'll either be one of the ones informally scheduled in here,
// or something from the deferral queue.
// Seed next event to end of line.
int next_event = line_length_.length;
const int next_deferred_event = deferrer_.time_until_next_action().as<int>();
if(next_deferred_event >= 0)
next_event = std::min(next_event, next_deferred_event + x_);
// Check the explicitly-placed events.
if(horizontal_timings.reset_blank > x_) next_event = std::min(next_event, horizontal_timings.reset_blank);
if(horizontal_timings.set_blank > x_) next_event = std::min(next_event, horizontal_timings.set_blank);
@ -180,6 +184,8 @@ void Video::advance(HalfCycles duration) {
const bool hsync = horizontal_.sync;
const bool vsync = vertical_.sync;
assert(run_length > 0);
// Ensure proper fetching irrespective of the output.
if(load_) {
const int since_load = x_ - load_base_;
@ -275,7 +281,9 @@ void Video::advance(HalfCycles duration) {
// Apply the next event.
x_ += run_length;
assert(integer_duration >= run_length);
integer_duration -= run_length;
deferrer_.advance(HalfCycles(run_length));
// Check horizontal events; the first six are guaranteed to occur separately.
if(horizontal_timings.reset_blank == x_) horizontal_.blank = false;
@ -327,7 +335,9 @@ void Video::advance(HalfCycles duration) {
const bool next_display_enable = vertical_.enable && horizontal_.enable;
if(display_enable != next_display_enable) {
// Schedule change in outwardly-visible DE line.
// add_event(de_delay_period - integer_duration, next_display_enable ? Event::Type::SetDisplayEnable : Event::Type::ResetDisplayEnable);
deferrer_.defer(de_delay_period, [this, next_display_enable] {
this->public_state_.display_enable = next_display_enable;
});
// Schedule change in inwardly-visible effect.
next_load_toggle_ = x_ + 8; // 4 cycles = 8 half-cycles
@ -335,35 +345,18 @@ void Video::advance(HalfCycles duration) {
if(horizontal_.sync != hsync) {
// Schedule change in outwardly-visible hsync line.
// add_event(hsync_delay_period - integer_duration, horizontal_.sync ? Event::Type::SetHsync : Event::Type::ResetHsync);
deferrer_.defer(hsync_delay_period, [this, next_horizontal_sync = horizontal_.sync] {
this->public_state_.hsync = next_horizontal_sync;
});
}
if(vertical_.sync != vsync) {
// Schedule change in outwardly-visible hsync line.
// add_event(vsync_delay_period - integer_duration, vertical_.sync ? Event::Type::SetVsync : Event::Type::ResetVsync);
deferrer_.defer(vsync_delay_period, [this, next_vertical_sync = vertical_.sync] {
this->public_state_.vsync = next_vertical_sync;
});
}
}
// Effect any changes in visible state out here; they've been supplied as sequence points, so
// a conforming caller can't hit them within the inner loop.
// integer_duration = int(duration.as_integral());
// if(!pending_events_.empty()) {
// auto erase_iterator = pending_events_.begin();
// int duration_remaining = integer_duration;
// while(erase_iterator != pending_events_.end()) {
// erase_iterator->delay -= duration_remaining;
// if(erase_iterator->delay <= 0) {
// duration_remaining = -erase_iterator->delay;
// erase_iterator->apply(public_state_);
// ++erase_iterator;
// } else {
// break;
// }
// }
// if(erase_iterator != pending_events_.begin()) {
// pending_events_.erase(pending_events_.begin(), erase_iterator);
// }
// }
}
void Video::push_latched_data() {
@ -419,7 +412,7 @@ HalfCycles Video::get_next_sequence_point() {
// If any events are pending, give the first of those the chance to be next.
const auto next_deferred_item = deferrer_.time_until_next_action();
if(next_deferred_item != HalfCycles(-1)) {
event_time = std::min(event_time, next_deferred_item.as<int>());
event_time = std::min(event_time, x_ + next_deferred_item.as<int>());
}
// If this is a vertically-enabled line, check for the display enable boundaries, + the standard delay.

56
Machines/Atari/ST/Video.hpp
View File

@ -121,8 +121,7 @@ class Video {
Range get_memory_access_range();
private:
void advance(HalfCycles duration);
DeferredQueuePerformer<HalfCycles> deferrer_;
DeferredQueue<HalfCycles> deferrer_;
Outputs::CRT::CRT crt_;
RangeObserver *range_observer_ = nullptr;
@ -243,59 +242,6 @@ class Video {
bool vsync = false;
} public_state_;
struct Event {
int delay;
enum class Type {
SetDisplayEnable, ResetDisplayEnable,
SetHsync, ResetHsync,
SetVsync, ResetVsync,
} type;
Event(Type type, int delay) : delay(delay), type(type) {}
void apply(PublicState &state) {
apply(type, state);
}
static void apply(Type type, PublicState &state) {
switch(type) {
default:
case Type::SetDisplayEnable: state.display_enable = true; break;
case Type::ResetDisplayEnable: state.display_enable = false; break;
case Type::SetHsync: state.hsync = true; break;
case Type::ResetHsync: state.hsync = false; break;
case Type::SetVsync: state.vsync = true; break;
case Type::ResetVsync: state.vsync = false; break;
}
}
};
/* std::vector<Event> pending_events_;
void add_event(int delay, Event::Type type) {
// Apply immediately if there's no delay (or a negative delay).
if(delay <= 0) {
Event::apply(type, public_state_);
return;
}
if(!pending_events_.empty()) {
// Otherwise enqueue, having subtracted the delay for any preceding events,
// and subtracting from the subsequent, if any.
auto insertion_point = pending_events_.begin();
while(insertion_point != pending_events_.end() && insertion_point->delay < delay) {
delay -= insertion_point->delay;
++insertion_point;
}
if(insertion_point != pending_events_.end()) {
insertion_point->delay -= delay;
}
pending_events_.emplace(insertion_point, type, delay);
} else {
pending_events_.emplace_back(type, delay);
}
}*/
friend class ::VideoTester;
};