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use std::collections::HashMap;
use std::ops::{Deref, DerefMut};
use zerocopy::AsBytes;
use wgpu::*;
use crate::draw::{Command as DrawCommand, DrawList, Update, Vertex};
use crate::layout::Rectangle;
use crate::style::Style;
use crate::Component;
use std::num::NonZeroU32;
use wgpu::util::DeviceExt;
/// Wrapper for [`Ui`](../../struct.Ui.html) that adds wgpu rendering.
/// Requires the "wgpu" feature.
pub struct Ui<C: 'static + Component> {
inner: crate::Ui<C>,
pipeline: RenderPipeline,
bind_group_layout: BindGroupLayout,
sampler: Sampler,
textures: HashMap<usize, TextureEntry>,
vertex_buffer: Option<Buffer>,
draw_commands: Vec<DrawCommand>,
}
struct TextureEntry {
texture: Texture,
bind_group: BindGroup,
}
impl<C: Component> Ui<C> {
/// Constructs a new `Ui`. Returns an error if the style fails to load.
pub fn new<S, E>(
root_component: C,
viewport: Rectangle,
hidpi_scale: f32,
style: S,
format: wgpu::TextureFormat,
device: &Device,
) -> anyhow::Result<Self>
where
S: TryInto<Style, Error = E>,
anyhow::Error: From<E>,
{
Ok(Self::new_inner(
crate::Ui::new(root_component, viewport, hidpi_scale, style)?,
format,
device,
))
}
fn new_inner(inner: crate::Ui<C>, format: wgpu::TextureFormat, device: &Device) -> Self {
let shader_module = device.create_shader_module(&ShaderModuleDescriptor {
label: Some("wgpu.wgsl"),
source: wgpu::ShaderSource::Wgsl(include_str!("wgpu.wgsl").into()),
});
let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: None,
entries: &[
wgpu::BindGroupLayoutEntry {
binding: 0,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Texture {
sample_type: wgpu::TextureSampleType::Float { filterable: true },
multisampled: false,
view_dimension: wgpu::TextureViewDimension::D2,
},
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 1,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Sampler {
filtering: true,
comparison: false,
},
count: None,
},
],
});
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: None,
bind_group_layouts: &[&bind_group_layout],
push_constant_ranges: &[],
});
let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
label: None,
layout: Some(&pipeline_layout),
vertex: wgpu::VertexState {
module: &shader_module,
entry_point: "vs_main",
buffers: &[wgpu::VertexBufferLayout {
array_stride: std::mem::size_of::<Vertex>() as u64,
step_mode: wgpu::VertexStepMode::Vertex,
attributes: &[
wgpu::VertexAttribute {
format: VertexFormat::Float32x2,
offset: 0,
shader_location: 0,
},
wgpu::VertexAttribute {
format: VertexFormat::Float32x2,
offset: 8,
shader_location: 1,
},
wgpu::VertexAttribute {
format: VertexFormat::Float32x4,
offset: 16,
shader_location: 2,
},
wgpu::VertexAttribute {
format: VertexFormat::Float32,
offset: 32,
shader_location: 3,
},
],
}],
},
primitive: wgpu::PrimitiveState {
topology: PrimitiveTopology::TriangleList,
..wgpu::PrimitiveState::default()
},
depth_stencil: None,
multisample: Default::default(),
fragment: Some(wgpu::FragmentState {
module: &shader_module,
entry_point: "fs_main",
targets: &[wgpu::ColorTargetState {
format,
blend: Some(wgpu::BlendState::ALPHA_BLENDING),
write_mask: wgpu::ColorWrites::ALL,
}],
}),
});
let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
label: None,
address_mode_u: wgpu::AddressMode::ClampToEdge,
address_mode_v: wgpu::AddressMode::ClampToEdge,
address_mode_w: wgpu::AddressMode::ClampToEdge,
mag_filter: wgpu::FilterMode::Nearest,
min_filter: wgpu::FilterMode::Linear,
mipmap_filter: wgpu::FilterMode::Linear,
lod_min_clamp: 0.0,
lod_max_clamp: 0.0,
compare: None,
anisotropy_clamp: None,
border_color: None,
});
Self {
inner,
pipeline,
bind_group_layout,
sampler,
textures: HashMap::new(),
vertex_buffer: None,
draw_commands: Vec::new(),
}
}
/// Draw the ui to a `RenderPass`.
/// The `device` must be the same as the one passed to [`new()`](#method.new).
/// The `render_pass` render target must be compatible with the `texture_format` passed to [`new`](#method.new).
pub fn draw<'a>(&'a mut self, device: &Device, queue: &Queue, render_pass: &mut RenderPass<'a>) {
if self.inner.needs_redraw() {
let DrawList {
updates,
vertices,
commands,
} = self.inner.draw();
self.vertex_buffer.take();
self.draw_commands = commands;
if !updates.is_empty() {
let cmd = device.create_command_encoder(&CommandEncoderDescriptor { label: None });
queue.submit(Some(
updates
.into_iter()
.fold(cmd, |mut cmd, update| {
match update {
Update::Texture {
id,
size,
data,
atlas: _,
} => {
let texture_desc = wgpu::TextureDescriptor {
label: None,
size: wgpu::Extent3d {
width: size[0],
height: size[1],
depth_or_array_layers: 1,
},
mip_level_count: 1,
sample_count: 1,
dimension: wgpu::TextureDimension::D2,
format: wgpu::TextureFormat::Rgba8Unorm,
usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
};
let texture = if data.is_empty() {
device.create_texture(&texture_desc)
} else {
device.create_texture_with_data(queue, &texture_desc, data.as_slice())
};
let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
layout: &self.bind_group_layout,
entries: &[
wgpu::BindGroupEntry {
binding: 0,
resource: wgpu::BindingResource::TextureView(&view),
},
wgpu::BindGroupEntry {
binding: 1,
resource: wgpu::BindingResource::Sampler(&self.sampler),
},
],
label: None,
});
self.textures.insert(id, TextureEntry { bind_group, texture });
}
Update::TextureSubresource { id, offset, size, data } => {
let texture = self
.textures
.get(&id)
.map(|val| &val.texture)
.expect("non existing texture is updated");
let padding = 256 - (size[0] * 4) % 256;
let data = if padding > 0 {
data.chunks(size[0] as usize * 4).fold(Vec::new(), |mut data, row| {
data.extend_from_slice(row);
data.extend(std::iter::repeat(0).take(padding as _));
data
})
} else {
data
};
let staging = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: None,
contents: data.as_slice(),
usage: wgpu::BufferUsages::COPY_SRC,
});
cmd.copy_buffer_to_texture(
wgpu::ImageCopyBuffer {
buffer: &staging,
layout: wgpu::ImageDataLayout {
offset: 0,
bytes_per_row: NonZeroU32::new(size[0] * 4 + padding),
rows_per_image: None,
},
},
wgpu::ImageCopyTexture {
texture,
mip_level: 0,
origin: wgpu::Origin3d {
x: offset[0],
y: offset[1],
z: 0,
},
aspect: wgpu::TextureAspect::All,
},
wgpu::Extent3d {
width: size[0],
height: size[1],
depth_or_array_layers: 1,
},
);
}
}
cmd
})
.finish(),
));
}
if !vertices.is_empty() {
self.vertex_buffer
.replace(device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: None,
contents: vertices.as_bytes(),
usage: wgpu::BufferUsages::VERTEX,
}));
}
}
if let Some(vertex_buffer) = self.vertex_buffer.as_ref() {
render_pass.set_pipeline(&self.pipeline);
render_pass.set_bind_group(0, &self.textures.values().next().unwrap().bind_group, &[]);
render_pass.set_vertex_buffer(0, vertex_buffer.slice(..));
}
for command in self.draw_commands.iter() {
match command {
DrawCommand::Clip { scissor } => {
render_pass.set_scissor_rect(
scissor.left as u32,
scissor.top as u32,
scissor.width() as u32,
scissor.height() as u32,
);
}
&DrawCommand::Colored { offset, count } => {
render_pass.draw(offset as u32..(offset + count) as u32, 0..1);
}
&DrawCommand::Textured { texture, offset, count } => {
render_pass.set_bind_group(0, &self.textures.get(&texture).unwrap().bind_group, &[]);
render_pass.draw(offset as u32..(offset + count) as u32, 0..1);
}
DrawCommand::Nop => (),
}
}
}
}
impl<C: Component> Deref for Ui<C> {
type Target = crate::Ui<C>;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<C: Component> DerefMut for Ui<C> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.inner
}
}