Phase-Distorter/cpp/src/presentation_pipeline.cpp at main · viith0/Phase-Distorter · GitHub

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#include "eb/presentation_pipeline.hpp"

#include <algorithm>
#include <cmath>
#include <stdexcept>

namespace eb {
double PresentationPipeline::validated_native_rate(double native_rate, double presentation_rate) {
    if (!std::isfinite(native_rate) || native_rate <= 0 || !std::isfinite(presentation_rate) || presentation_rate < 0)
        throw std::invalid_argument("Presentation rates must be finite; native rate must be positive");
    return native_rate;
}

PresentationPipeline::PresentationPipeline(Time now, const DisplaySettings& settings, double native_rate,
                                           double presentation_rate, bool presentation_enabled,
                                           PresentationFrame initial_frame)
    : presentation_enabled_(presentation_enabled), high_rate_(presentation_enabled && settings.high_frame_rate()),
      reduce_flashing_(settings.reduce_flashing), interpolate_frames_(settings.interpolate_frames),
      direct_rendering_(settings.direct_rendering),
      native_rate_(native_rate), presentation_rate_(presentation_rate),
      native_pacer_(now, validated_native_rate(native_rate, presentation_rate)),
      presentation_clock_(now, presentation_rate, settings.experimental_frame_pacing),
      current_picture_{initial_frame.pixels, initial_frame.width, initial_frame.fixed_aspect} {
    last_presented_ = now;
    if (reduce_flashing_ && !initial_frame.pixels.empty()) {
        current_picture_.pixels = photosensitivity_filter_.apply(initial_frame.pixels, int(initial_frame.width),
                                                                 DisplaySettings::native_height, true, initial_frame.flashing,
                                                                 initial_frame.unfiltered_mask);
        filtered_frame_ = initial_frame.frame;
    }
}

bool PresentationPipeline::configure(const DisplaySettings& settings, double native_rate, double presentation_rate,
                                     Time now) {
    validated_native_rate(native_rate, presentation_rate);
    presentation_clock_.set_guard_enabled(settings.experimental_frame_pacing);
    const bool high_rate = presentation_enabled_ && settings.high_frame_rate();
    if (high_rate != high_rate_ || presentation_rate != presentation_rate_) {
        high_rate_ = high_rate;
        presentation_rate_ = presentation_rate;
        presentation_clock_.reset(now, presentation_rate);
        native_pacer_.set_rate(now, native_rate);
        interpolator_.reset();
        scene_motion_.reset();
        native_picture_pending_ = native_wait_pending_ = false;
        fresh_picture_pending_ = false;
        last_presented_ = now;
    }
    if (reduce_flashing_ != settings.reduce_flashing) {
        reduce_flashing_ = settings.reduce_flashing;
        interpolator_.reset(); // Never mix filtered and unfiltered endpoints.
        scene_motion_.reset();
        photosensitivity_filter_.reset();
        filtered_frame_.reset();
    }
    interpolate_frames_ = settings.interpolate_frames;
    if (direct_rendering_ != settings.direct_rendering) {
        direct_rendering_ = settings.direct_rendering;
        scene_motion_.reset();
        interpolator_.reset();
    }
    const bool changed_native_rate = native_rate != native_rate_;
    if (changed_native_rate) {
        native_rate_ = native_rate;
        native_pacer_.set_rate(now, native_rate);
        native_picture_pending_ = native_wait_pending_ = false;
    }
    return changed_native_rate;
}

void PresentationPipeline::reset_native_deadline(Time now) {
    native_pacer_.set_rate(now, native_rate_);
    native_picture_pending_ = native_wait_pending_ = false;
}

void PresentationPipeline::restored_frame(PresentationFrame frame, Time now) {
    current_picture_ = {frame.pixels, frame.width, frame.fixed_aspect};
    interpolator_.reset();
    scene_motion_.reset();
    photosensitivity_filter_.reset();
    filtered_frame_.reset();
    native_pacer_.set_rate(now, native_rate_);
    presentation_clock_.reset(now, presentation_rate_);
    native_picture_pending_ = native_wait_pending_ = false;
    fresh_picture_pending_ = false;
    last_presented_ = now;
    completed_frame(frame);
    refresh_current_picture(frame, false);
}

void PresentationPipeline::completed_frame(PresentationFrame frame) {
    if (reduce_flashing_) {
        current_picture_ = {photosensitivity_filter_.apply(frame.pixels, int(frame.width),
                                                           DisplaySettings::native_height, true, frame.flashing, frame.unfiltered_mask),
                            frame.width, frame.fixed_aspect};
        filtered_frame_ = frame.frame;
    }
    if (high_rate_) {
        interpolator_.submit(reduce_flashing_ ? current_picture_.pixels : frame.pixels, frame.width,
                             DisplaySettings::native_height, frame.frame, frame.fixed_aspect, interpolate_frames_ && !direct_rendering_);
        // Even a black phase must stay on the filtered path while exposure is
        // reduced; identical black RGB doesn't mean the reduction has ended.
        const bool clean = !reduce_flashing_ || !photosensitivity_filter_.dimmed();
        scene_motion_.submit(direct_rendering_ && clean ? frame.scene : nullptr);
    }
}

void PresentationPipeline::refresh_current_picture(PresentationFrame frame, bool force) {
    if (force) {
        current_picture_ = {photosensitivity_filter_.apply(frame.pixels, int(frame.width),
                                                           DisplaySettings::native_height, reduce_flashing_, frame.flashing, frame.unfiltered_mask),
                            frame.width, frame.fixed_aspect};
    } else if (!reduce_flashing_) {
        current_picture_ = {
            photosensitivity_filter_.apply(frame.pixels, int(frame.width), DisplaySettings::native_height, false),
            frame.width, frame.fixed_aspect};
        filtered_frame_.reset();
    } else if (filtered_frame_ != frame.frame) {
        current_picture_ = {photosensitivity_filter_.apply(frame.pixels, int(frame.width),
                                                           DisplaySettings::native_height, true, frame.flashing, frame.unfiltered_mask),
                            frame.width, frame.fixed_aspect};
        filtered_frame_ = frame.frame;
    }
}

void PresentationPipeline::simulation_finished(PresentationFrame current_frame, std::uint64_t elapsed_frames,
                                               Time now) {
    refresh_current_picture(current_frame, false);
    if (!presentation_enabled_)
        return;
    fresh_picture_pending_ = true;
    elapsed_frames = std::max<std::uint64_t>(elapsed_frames, 1);
    native_wait_pending_ = false;
    if (high_rate_) {
        presentation_clock_.simulated(elapsed_frames);
        if (presentation_clock_.simulation_due(now))
            catch_up_frames_ += elapsed_frames;
    } else {
        native_picture_pending_ = native_pacer_.advance(now, elapsed_frames);
        if (!native_picture_pending_)
            catch_up_frames_ += elapsed_frames;
    }
}

bool PresentationPipeline::simulation_due(Time now) {
    if (!high_rate_)
        return true;
    presentation_clock_.resume(now);
    return presentation_clock_.simulation_due(now);
}

bool PresentationPipeline::presentation_due(Time now) const {
    if (!presentation_enabled_)
        return false;
    const bool catch_up_picture = fresh_picture_pending_ && now - last_presented_ >= FramePacer::period() * 2;
    return high_rate_ ? interpolator_.width() && (presentation_clock_.presentation_due(now) || catch_up_picture)
                      : native_picture_pending_ || catch_up_picture;
}

PresentationPicture PresentationPipeline::picture(Time now) {
    if (high_rate_ && interpolator_.width()) {
        const auto& scene = scene_motion_.sample(presentation_clock_.fraction(now));
        return {interpolator_.sample(presentation_clock_.fraction(now)), interpolator_.width(),
                interpolator_.fixed_aspect(), scene.artwork ? &scene : nullptr};
    }
    return current_picture_;
}

void PresentationPipeline::presented(Time now, Time::duration cost) {
    ++presented_frames_;
    fresh_picture_pending_ = false;
    last_presented_ = now;
    if (high_rate_)
        presentation_clock_.presented(now, cost);
    else {
        native_picture_pending_ = false;
        native_wait_pending_ = true;
    }
}

PresentationPipeline::Time PresentationPipeline::wake_time(Time now) const {
    if (!presentation_enabled_)
        return now;
    if (high_rate_)
        return presentation_clock_.wake(now);
    return native_wait_pending_ ? native_pacer_.deadline() : now;
}

void PresentationPipeline::refresh_after_error(PresentationFrame current_frame) {
    refresh_current_picture(current_frame, true);
}
} // namespace eb