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WIP throt

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This commit is contained in:
Alejandro Alonso 2026-04-24 13:18:12 +02:00
parent 7e76aace1b
commit 7750eb35e5
1 changed files with 53 additions and 0 deletions
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53
render-wasm/src/render.rs
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@ -334,6 +334,11 @@ pub(crate) struct RenderState {
/// Cleared at the beginning of a render pass; set to true after we clear Cache the first
/// time we are about to blit a tile into Cache for this pass.
pub cache_cleared_this_render: bool,
/// Present/backpressure state to avoid enqueuing GPU work when the driver is blocked.
pub last_present_ms: i32,
pub last_submit_dt_ms: i32,
pub gpu_backpressure_until_ms: i32,
}
pub fn get_cache_size(viewbox: Viewbox, scale: f32, interest: i32) -> skia::ISize {
@ -407,6 +412,9 @@ impl RenderState {
preview_mode: false,
export_context: None,
cache_cleared_this_render: false,
last_present_ms: 0,
last_submit_dt_ms: 33,
gpu_backpressure_until_ms: 0,
})
}
@ -1811,6 +1819,28 @@ impl RenderState {
) -> Result<()> {
performance::begin_measure!("process_animation_frame");
if self.render_in_progress {
let now0 = performance::get_time();
if now0 < self.gpu_backpressure_until_ms {
self.cancel_animation_frame();
self.render_request_id = Some(wapi::request_animation_frame!());
performance::end_measure!("process_animation_frame");
return Ok(());
}
// Key idea: during interactive transforms / viewport interactions,
// only enqueue GPU work in frames where we'll actually submit/present.
let min_interval_ms = self.last_submit_dt_ms.clamp(33, 200);
let should_submit_now = now0 - self.last_present_ms >= min_interval_ms;
// if (self.options.is_interactive_transform() || self.options.is_viewport_interaction())
// && !should_submit_now
if !should_submit_now
{
self.cancel_animation_frame();
self.render_request_id = Some(wapi::request_animation_frame!());
performance::end_measure!("process_animation_frame");
return Ok(());
}
if tree.len() != 0 {
self.render_shape_tree_partial(base_object, tree, timestamp, true)?;
}
@ -1829,12 +1859,35 @@ impl RenderState {
if !self.options.is_viewport_interaction() {
// self.gpu_state.context.flush_and_submit();
if self.options.is_interactive_transform() {
let t0 = performance::get_time();
self.gpu_state.context.flush_and_submit();
let dt = performance::get_time() - t0;
self.last_submit_dt_ms = dt;
self.last_present_ms = performance::get_time();
if dt > 16 {
self.gpu_backpressure_until_ms =
self.last_present_ms + (dt - 16).min(200);
}
} else {
let t0 = performance::get_time();
self.flush_and_submit();
let dt = performance::get_time() - t0;
self.last_submit_dt_ms = dt;
self.last_present_ms = performance::get_time();
if dt > 16 {
self.gpu_backpressure_until_ms =
self.last_present_ms + (dt - 16).min(200);
}
}
} else {
let t0 = performance::get_time();
self.gpu_state.context.flush_and_submit();
let dt = performance::get_time() - t0;
self.last_submit_dt_ms = dt;
self.last_present_ms = performance::get_time();
if dt > 16 {
self.gpu_backpressure_until_ms = self.last_present_ms + (dt - 16).min(200);
}
}
if self.render_in_progress {