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Changed gradient::Packed to be repr(C) for direct gpu upload.

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Bingus 2023-05-26 10:07:52 -07:00
parent 413526ad09
commit 902e333148
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GPG key ID: 5F84D2AA40A9F170
5 changed files with 31 additions and 22 deletions
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28
wgpu/src/layer.rs
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@ -13,6 +13,7 @@ pub use text::Text;
use crate::core;
use crate::core::alignment;
use crate::core::{Background, Color, Font, Point, Rectangle, Size, Vector};
use crate::graphics::gradient;
use crate::graphics::{Primitive, Viewport};
/// A group of primitives that should be clipped together.
@ -312,30 +313,33 @@ impl<'a> Layer<'a> {
}
/// Packs the [`Gradient`] for use in shader code.
fn pack_gradient(gradient: &core::Gradient, bounds: Rectangle) -> [f32; 44] {
fn pack_gradient(
gradient: &core::Gradient,
bounds: Rectangle,
) -> gradient::Packed {
match gradient {
core::Gradient::Linear(linear) => {
let mut pack: [f32; 44] = [0.0; 44];
let mut data: [f32; 44] = [0.0; 44];
for (index, stop) in linear.stops.iter().enumerate() {
let [r, g, b, a] =
stop.map_or(Color::default(), |s| s.color).into_linear();
pack[index * 4] = r;
pack[(index * 4) + 1] = g;
pack[(index * 4) + 2] = b;
pack[(index * 4) + 3] = a;
pack[32 + index] = stop.map_or(2.0, |s| s.offset);
data[index * 4] = r;
data[(index * 4) + 1] = g;
data[(index * 4) + 2] = b;
data[(index * 4) + 3] = a;
data[32 + index] = stop.map_or(2.0, |s| s.offset);
}
let (start, end) = linear.angle.to_distance(&bounds);
pack[40] = start.x;
pack[41] = start.y;
pack[42] = end.x;
pack[43] = end.y;
data[40] = start.x;
data[41] = start.y;
data[42] = end.x;
data[43] = end.y;
pack
data.into()
}
}
}