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|
use crate::graphics::gradient;
use crate::quad::{self, Quad};
use crate::Buffer;
use bytemuck::{Pod, Zeroable};
use std::ops::Range;
/// A quad filled with interpolated colors.
#[derive(Clone, Copy, Debug)]
#[repr(C)]
pub struct Gradient {
/// The background gradient data of the quad.
pub gradient: gradient::Packed,
/// The [`Quad`] data of the [`Gradient`].
pub quad: Quad,
}
#[allow(unsafe_code)]
unsafe impl Pod for Gradient {}
#[allow(unsafe_code)]
unsafe impl Zeroable for Gradient {}
#[derive(Debug)]
pub struct Layer {
instances: Buffer<Gradient>,
instance_count: usize,
}
impl Layer {
pub fn new(device: &wgpu::Device) -> Self {
let instances = Buffer::new(
device,
"iced_wgpu.quad.gradient.buffer",
quad::INITIAL_INSTANCES,
wgpu::BufferUsages::VERTEX | wgpu::BufferUsages::COPY_DST,
);
Self {
instances,
instance_count: 0,
}
}
pub fn prepare(
&mut self,
device: &wgpu::Device,
queue: &wgpu::Queue,
instances: &[Gradient],
) {
let _ = self.instances.resize(device, instances.len());
let _ = self.instances.write(queue, 0, instances);
self.instance_count = instances.len();
}
}
#[derive(Debug)]
pub struct Pipeline {
pipeline: wgpu::RenderPipeline,
}
impl Pipeline {
pub fn new(
device: &wgpu::Device,
format: wgpu::TextureFormat,
constants_layout: &wgpu::BindGroupLayout,
) -> Self {
let layout =
device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: Some("iced_wgpu.quad.gradient.pipeline"),
push_constant_ranges: &[],
bind_group_layouts: &[constants_layout],
});
let shader =
device.create_shader_module(wgpu::ShaderModuleDescriptor {
label: Some("iced_wgpu.quad.gradient.shader"),
source: wgpu::ShaderSource::Wgsl(std::borrow::Cow::Borrowed(
include_str!("../shader/quad.wgsl"),
)),
});
let pipeline =
device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
label: Some("iced_wgpu.quad.gradient.pipeline"),
layout: Some(&layout),
vertex: wgpu::VertexState {
module: &shader,
entry_point: "gradient_vs_main",
buffers: &[
quad::Vertex::buffer_layout(),
wgpu::VertexBufferLayout {
array_stride: std::mem::size_of::<Gradient>()
as u64,
step_mode: wgpu::VertexStepMode::Instance,
attributes: &wgpu::vertex_attr_array!(
// Colors 1-2
1 => Uint32x4,
// Colors 3-4
2 => Uint32x4,
// Colors 5-6
3 => Uint32x4,
// Colors 7-8
4 => Uint32x4,
// Offsets 1-8
5 => Uint32x4,
// Direction
6 => Float32x4,
// Position & Scale
7 => Float32x4,
// Border color
8 => Float32x4,
// Border radius
9 => Float32x4,
// Border width
10 => Float32
),
},
],
},
fragment: Some(wgpu::FragmentState {
module: &shader,
entry_point: "gradient_fs_main",
targets: &quad::color_target_state(format),
}),
primitive: wgpu::PrimitiveState {
topology: wgpu::PrimitiveTopology::TriangleList,
front_face: wgpu::FrontFace::Cw,
..Default::default()
},
depth_stencil: None,
multisample: wgpu::MultisampleState {
count: 1,
mask: !0,
alpha_to_coverage_enabled: false,
},
multiview: None,
});
Self { pipeline }
}
pub fn render<'a>(
&'a self,
render_pass: &mut wgpu::RenderPass<'a>,
constants: &'a wgpu::BindGroup,
layer: &'a Layer,
range: Range<usize>,
) {
#[cfg(feature = "tracing")]
let _ = tracing::info_span!("Wgpu::Quad::Gradient", "DRAW").entered();
render_pass.set_pipeline(&self.pipeline);
render_pass.set_bind_group(0, constants, &[]);
render_pass.set_vertex_buffer(1, layer.instances.slice(..));
render_pass.draw_indexed(
0..quad::INDICES.len() as u32,
0,
range.start as u32..range.end as u32,
);
}
}
|
