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Ray-caster: only draw when the scene is changed

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This is how I typically schedule draw calls in JavaScript applications.
The baseline CPU activity for the display prototype is now in line with
other pages (though perhaps a bit higher), and the profiler shows little
time being spent in draw calls, even when I'm continually moving a
slider. The interface feels pretty responsive overall, although the
sliders seem to be lagging a bit.
This commit is contained in:
Aaron Fenyes 2024-08-27 13:55:08 -07:00
parent f62f44b5a7
commit a40a110788
1 changed files with 73 additions and 57 deletions
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130
app-proto/inversive-display/src/main.rs
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@ -108,6 +108,21 @@ fn main() {
// display
let display = create_node_ref();
// change listener
let scene_changed = create_signal(true);
create_effect(move || {
ctrl_x.track();
ctrl_y.track();
radius_x.track();
radius_y.track();
opacity.track();
highlight.track();
layer_threshold.track();
debug_mode.track();
scene_changed.set(true);
});
on_mount(move || {
// list construction elements
const SPHERE_MAX: usize = 12;
@ -216,66 +231,67 @@ fn main() {
bind_vertex_attrib(&ctx, position_index, 3, &positions);
// set up a repainting routine
let (_, start_updating_display, _) = create_raf(move || {
/* INSTRUMENTS */
// measure frame time
frames_since_last_sample += 1;
if frames_since_last_sample >= SAMPLE_PERIOD {
let frame_moment = performance.now();
frame_time.set((frame_moment - last_frame_moment) / (SAMPLE_PERIOD as f64));
last_frame_moment = frame_moment;
let (_, start_animation_loop, _) = create_raf(move || {
if scene_changed.get() {
/* INSTRUMENTS */
// measure frame time
frames_since_last_sample += 1;
if frames_since_last_sample >= SAMPLE_PERIOD {
let frame_moment = performance.now();
frame_time.set((frame_moment - last_frame_moment) / (SAMPLE_PERIOD as f64));
last_frame_moment = frame_moment;
frames_since_last_sample = 0;
}
// update the construction
sphere_vec.clear();
sphere_vec.push(engine::sphere(0.5, 0.5, -5.0 + ctrl_x.get(), radius_x.get()));
sphere_vec.push(engine::sphere(-0.5, -0.5, -5.0 + ctrl_y.get(), radius_y.get()));
sphere_vec.push(engine::sphere(-0.5, 0.5, -5.0, 0.75));
// set the resolution
let width = canvas.width() as f32;
let height = canvas.height() as f32;
ctx.uniform2f(resolution_loc.as_ref(), width, height);
ctx.uniform1f(shortdim_loc.as_ref(), width.min(height));
// pass the construction
ctx.uniform1i(sphere_cnt_loc.as_ref(), sphere_vec.len() as i32);
for n in 0..sphere_vec.len() {
let v = &sphere_vec[n];
ctx.uniform3f(
sphere_sp_locs[n].as_ref(),
v[0] as f32, v[1] as f32, v[2] as f32
);
ctx.uniform2f(
sphere_lt_locs[n].as_ref(),
v[3] as f32, v[4] as f32
);
ctx.uniform3fv_with_f32_array(
color_locs[n].as_ref(),
&color_vec[n]
);
}
// pass the control parameters
ctx.uniform2f(ctrl_loc.as_ref(), ctrl_x.get() as f32, ctrl_y.get() as f32); /* DEBUG */
ctx.uniform2f(radius_loc.as_ref(), radius_x.get() as f32, radius_y.get() as f32); /* DEBUG */
ctx.uniform1f(opacity_loc.as_ref(), opacity.get() as f32);
ctx.uniform1f(highlight_loc.as_ref(), highlight.get() as f32);
ctx.uniform1i(layer_threshold_loc.as_ref(), layer_threshold.get() as i32);
ctx.uniform1i(debug_mode_loc.as_ref(), debug_mode.get() as i32);
// draw the scene
ctx.draw_arrays(WebGl2RenderingContext::TRIANGLES, 0, VERTEX_CNT as i32);
// clear scene change flag
scene_changed.set(false);
} else {
frames_since_last_sample = 0;
frame_time.set(-1.0);
}
// update the construction
sphere_vec.clear();
sphere_vec.push(engine::sphere(0.5, 0.5, -5.0 + ctrl_x.get(), radius_x.get()));
sphere_vec.push(engine::sphere(-0.5, -0.5, -5.0 + ctrl_y.get(), radius_y.get()));
sphere_vec.push(engine::sphere(-0.5, 0.5, -5.0, 0.75));
// set the resolution
let width = canvas.width() as f32;
let height = canvas.height() as f32;
ctx.uniform2f(resolution_loc.as_ref(), width, height);
ctx.uniform1f(shortdim_loc.as_ref(), width.min(height));
// pass the construction
ctx.uniform1i(sphere_cnt_loc.as_ref(), sphere_vec.len() as i32);
for n in 0..sphere_vec.len() {
let v = &sphere_vec[n];
ctx.uniform3f(
sphere_sp_locs[n].as_ref(),
v[0] as f32, v[1] as f32, v[2] as f32
);
ctx.uniform2f(
sphere_lt_locs[n].as_ref(),
v[3] as f32, v[4] as f32
);
ctx.uniform3fv_with_f32_array(
color_locs[n].as_ref(),
&color_vec[n]
);
}
// pass the control parameters
ctx.uniform2f(ctrl_loc.as_ref(), ctrl_x.get() as f32, ctrl_y.get() as f32); /* DEBUG */
ctx.uniform2f(radius_loc.as_ref(), radius_x.get() as f32, radius_y.get() as f32); /* DEBUG */
ctx.uniform1f(opacity_loc.as_ref(), opacity.get() as f32);
ctx.uniform1f(highlight_loc.as_ref(), highlight.get() as f32);
ctx.uniform1i(layer_threshold_loc.as_ref(), layer_threshold.get() as i32);
ctx.uniform1i(debug_mode_loc.as_ref(), debug_mode.get() as i32);
// draw the scene
ctx.draw_arrays(WebGl2RenderingContext::TRIANGLES, 0, VERTEX_CNT as i32);
});
/*
this wastes CPU time by running an animation loop, which updates the
display even when nothing has changed. there should be a way to make
Sycamore do single-frame updates in response to changes, but i
haven't found it yet
*/
start_updating_display();
start_animation_loop();
});
view! {