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use super::state::{clear_error, reload, reload_changed_sources, set_error, update_status};
use super::*;
pub(super) fn render_loop(
root: PathBuf,
shared: Shared,
controls: mpsc::Receiver<Control>,
preserve_reload_state: bool,
runtime: &mut Runtime<'_>,
mut recorder: Option<ReplayRecorder>,
) {
let mut loaded: Option<LoadedManifest> = None;
let mut sources: Option<SourceGraph> = None;
let mut changed_paths = BTreeSet::new();
let mut width = 1280u32;
let mut height = 720u32;
let mut fps = 60.0f32;
let mut paused = false;
let mut view = String::from("image");
let mut fresh = true;
let mut force_render = true;
let mut reload_due: Option<Instant> = None;
let mut next_frame = Instant::now();
match reload(
&root,
runtime,
&mut loaded,
&mut sources,
&mut width,
&mut height,
&mut fps,
&mut view,
preserve_reload_state,
) {
Ok(()) => {
update_status(
&shared,
loaded.as_ref(),
runtime,
width,
height,
fps,
paused,
&view,
None,
false,
);
}
Err(error) => {
update_status(
&shared,
loaded.as_ref(),
runtime,
width,
height,
fps,
paused,
&view,
Some(error.to_string()),
false,
);
}
}
'main: loop {
let mut pending = Vec::new();
while let Ok(control) = controls.try_recv() {
pending.push(control);
}
for control in pending {
if !handle_control(
control,
&root,
&shared,
runtime,
&mut recorder,
&mut loaded,
&mut sources,
&mut changed_paths,
&mut width,
&mut height,
&mut fps,
&mut paused,
&mut view,
&mut fresh,
&mut force_render,
&mut reload_due,
&mut next_frame,
) {
break 'main;
}
}
if let Some(due) = reload_due
&& Instant::now() >= due
{
reload_due = None;
let changed = std::mem::take(&mut changed_paths);
let incremental = match (&loaded, &mut sources) {
(Some(current), Some(current_sources)) => {
reload_changed_sources(&root, runtime, current, current_sources, &changed)
}
_ => Ok(false),
};
match incremental {
Ok(true) => {
force_render = true;
clear_error(&shared);
}
Ok(false) => {
match reload(
&root,
runtime,
&mut loaded,
&mut sources,
&mut width,
&mut height,
&mut fps,
&mut view,
preserve_reload_state,
) {
Ok(()) => {
fresh = true;
force_render = true;
clear_error(&shared);
}
Err(error) => {
// Full project reload compiles before replacing the active pipeline.
// Keep rendering the last good project and frame.
set_error(&shared, format!("{error:#}"));
}
}
}
Err(error) => {
// Per-pass reload is transactional and rolls back earlier impacted passes.
set_error(&shared, format!("{error:#}"));
}
}
}
let now = Instant::now();
let clients = shared.clients.load(Ordering::Relaxed);
let scheduled = !paused && clients > 0 && now >= next_frame;
if loaded.is_some() && (force_render || scheduled) {
let should_advance = !fresh && !paused && scheduled;
if should_advance && let Err(error) = runtime.tick_fixed(1.0 / fps, fps) {
set_error(&shared, error.to_string());
}
match runtime.render(width, height) {
Ok(final_image) => {
let selected = if let Some(project) = &loaded {
if view == project.manifest.final_pass().name {
Some(final_image)
} else {
let dimensions = project
.manifest
.passes
.iter()
.find(|pass| pass.name == view)
.map(|pass| project.manifest.pass_dimensions(pass, width, height));
match dimensions {
Some((pass_width, pass_height)) => {
match runtime.snapshot_pass_rgb(&view, pass_width, pass_height)
{
Ok(image) => Some(image),
Err(error) => {
set_error(&shared, error.to_string());
None
}
}
}
None => {
set_error(&shared, format!("unknown preview pass '{view}'"));
None
}
}
}
} else {
None
};
if let Some(image) = selected {
match rgb_png_bytes(&image) {
Ok(png) => {
let png = Bytes::from(png);
*shared
.frame_png
.write()
.expect("preview frame lock poisoned") = png.clone();
update_status(
&shared,
loaded.as_ref(),
runtime,
width,
height,
fps,
paused,
&view,
None,
true,
);
let _ = shared.frames.send(png);
}
Err(error) => set_error(&shared, error.to_string()),
}
}
if let Some(recorder) = &mut recorder
&& let Err(error) = recorder.record_frame(
runtime.frame(),
runtime.time(),
runtime.time_delta(),
runtime.frame_rate(),
)
{
set_error(&shared, format!("replay recording failed: {error:#}"));
}
let _ = runtime.clear_key_transients();
}
Err(error) => set_error(&shared, error.to_string()),
}
fresh = false;
force_render = false;
next_frame = Instant::now() + Duration::from_secs_f64(1.0 / f64::from(fps.max(1.0)));
}
let timeout = if !paused && shared.clients.load(Ordering::Relaxed) > 0 {
next_frame
.saturating_duration_since(Instant::now())
.min(Duration::from_millis(50))
} else {
Duration::from_millis(50)
};
match controls.recv_timeout(timeout) {
Ok(control) => {
if !handle_control(
control,
&root,
&shared,
runtime,
&mut recorder,
&mut loaded,
&mut sources,
&mut changed_paths,
&mut width,
&mut height,
&mut fps,
&mut paused,
&mut view,
&mut fresh,
&mut force_render,
&mut reload_due,
&mut next_frame,
) {
break;
}
}
Err(mpsc::RecvTimeoutError::Timeout) => {}
Err(mpsc::RecvTimeoutError::Disconnected) => break,
}
}
if let Some(recorder) = &mut recorder
&& let Err(error) = recorder.flush()
{
set_error(&shared, format!("replay recording flush failed: {error:#}"));
}
}
#[allow(clippy::too_many_arguments)]
fn handle_control(
control: Control,
root: &Path,
shared: &Shared,
runtime: &mut Runtime<'_>,
recorder: &mut Option<ReplayRecorder>,
loaded: &mut Option<LoadedManifest>,
sources: &mut Option<SourceGraph>,
changed_paths: &mut BTreeSet<PathBuf>,
width: &mut u32,
height: &mut u32,
fps: &mut f32,
paused: &mut bool,
view: &mut String,
fresh: &mut bool,
force_render: &mut bool,
reload_due: &mut Option<Instant>,
next_frame: &mut Instant,
) -> bool {
match control {
Control::Shutdown => return false,
Control::FilesChanged(paths) => {
if let Some(recorder) = recorder
&& let Err(error) = recorder.invalidate(
"project files changed during recording; restart preview to capture a reproducible session",
)
{
set_error(shared, format!("replay recording invalidation failed: {error:#}"));
}
changed_paths.extend(paths);
*reload_due = Some(Instant::now() + Duration::from_millis(120));
}
Control::Pause => {
if let Err(error) = runtime.pause() {
set_error(shared, error.to_string());
} else {
*paused = true;
*force_render = true;
}
}
Control::Resume => {
if let Err(error) = runtime.resume() {
set_error(shared, error.to_string());
} else {
*paused = false;
*next_frame = Instant::now();
}
}
Control::Reset => match reload(
root, runtime, loaded, sources, width, height, fps, view, false,
) {
Ok(()) => {
*fresh = true;
*force_render = true;
clear_error(shared);
record_action(recorder, shared, ReplayAction::Reset);
}
Err(error) => set_error(shared, error.to_string()),
},
Control::Step => {
let was_paused = *paused;
if was_paused {
let _ = runtime.resume();
}
if let Err(error) = runtime.tick_fixed(1.0 / *fps, *fps) {
set_error(shared, error.to_string());
} else {
*fresh = true;
*force_render = true;
}
if was_paused {
let _ = runtime.pause();
}
}
Control::View(pass) => {
if let Some(project) = loaded {
if project
.manifest
.passes
.iter()
.any(|candidate| candidate.name == pass && candidate.kind != PassKind::Cubemap)
{
*view = pass;
*force_render = true;
} else {
set_error(shared, format!("unknown/non-2D preview pass '{pass}'"));
}
}
}
Control::Resolution(new_width, new_height) => {
if new_width == 0
|| new_height == 0
|| new_width > MAX_PREVIEW_DIMENSION
|| new_height > MAX_PREVIEW_DIMENSION
{
set_error(
shared,
format!(
"preview resolution must be between 1x1 and {0}x{0}",
MAX_PREVIEW_DIMENSION
),
);
} else {
*width = new_width;
*height = new_height;
// Keep the active runtime so fixed-size offscreen targets and their
// feedback history survive output-resolution changes. Dynamic
// output-sized buffers will resize on their next render.
*force_render = true;
clear_error(shared);
record_action(
recorder,
shared,
ReplayAction::Resolution {
width: new_width,
height: new_height,
},
);
}
}
Control::TimeScale(value) => {
if value.is_finite() && (-8.0..=8.0).contains(&value) {
if let Err(error) = runtime.set_time_scale(value) {
set_error(shared, error.to_string());
} else {
*force_render = true;
record_action(recorder, shared, ReplayAction::TimeScale { value });
}
} else {
set_error(
shared,
"time scale must be a finite log2 value in [-8, 8]".into(),
);
}
}
Control::Mouse {
x,
y,
down,
clicked,
} => {
if let Err(error) = runtime.set_mouse(x, y, down, clicked) {
set_error(shared, error.to_string());
} else {
record_action(
recorder,
shared,
ReplayAction::Mouse {
x,
y,
down,
clicked,
},
);
if *paused {
*force_render = true;
}
}
}
Control::Key {
code,
down,
pressed,
} => {
if let Err(error) = runtime.set_key(code, down, pressed) {
set_error(shared, error.to_string());
} else {
record_action(
recorder,
shared,
ReplayAction::Key {
code,
down,
pressed,
},
);
if *paused {
*force_render = true;
}
}
}
}
true
}
fn record_action(recorder: &mut Option<ReplayRecorder>, shared: &Shared, action: ReplayAction) {
if let Some(recorder) = recorder
&& let Err(error) = recorder.record(action)
{
set_error(shared, format!("replay recording failed: {error:#}"));
}
}