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Clarify tessellate

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Emil Ernerfeldt
2023-11-09 19:23:37 +01:00
parent a852333f9b
commit 0f7d1d557c
1 changed files with 12 additions and 10 deletions
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22
crates/egui/src/context.rs
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@@ -163,7 +163,7 @@ struct ContextImpl {
viewport_stack: Vec<ViewportIdPair>,
/// What is the last viewport rendered?
last: ViewportId,
last_viewport: ViewportId,
// The output of a frame:
graphics: ViewportIdMap<GraphicLayers>,
@@ -1542,7 +1542,7 @@ impl Context {
let mut viewports = Vec::new();
self.write(|ctx| {
ctx.last = viewport_id;
ctx.last_viewport = viewport_id;
ctx.viewports.retain(|_, viewport| {
let was_used = viewport.used;
@@ -1628,19 +1628,23 @@ impl Context {
/// Tessellate the given shapes into triangle meshes.
///
/// Will use the last viewport id
/// Will use the `pixels_per_point` of the last viewport for feathering (anti-aliasing).
pub fn tessellate(&self, shapes: Vec<ClippedShape>) -> Vec<ClippedPrimitive> {
let last = self.read(|ctx| ctx.last);
self.tessellate_for(shapes, last)
let last_viewport = self.read(|ctx| ctx.last_viewport);
// here we expect that we are the only user of context, since frame is ended
let pixels_per_point = self.input_for(last_viewport, |i| i.pixels_per_point());
self.tessellate_with_pixels_per_point(shapes, pixels_per_point)
}
/// Tessellate the given shapes into triangle meshes.
///
/// The `viewport_id` is used to get the correct `pixels_per_point`.
pub fn tessellate_for(
/// `pixels_per_point` is used for feathering (anti-aliasing).
pub fn tessellate_with_pixels_per_point(
&self,
shapes: Vec<ClippedShape>,
viewport_id: ViewportId,
pixels_per_point: f32,
) -> Vec<ClippedPrimitive> {
crate::profile_function!();
@@ -1648,8 +1652,6 @@ impl Context {
// shapes are the same, but just comparing the shapes takes about 50% of the time
// it takes to tessellate them, so it is not a worth optimization.
// here we expect that we are the only user of context, since frame is ended
let pixels_per_point = self.input_for(viewport_id, |i| i.pixels_per_point());
self.write(|ctx| {
let tessellation_options = ctx.memory.options.tessellation_options;
let texture_atlas = ctx