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use {
crate::{
color::Linear,
error::ResourceNotFound,
handles::LayerHandle,
layer::{Builder, Layer},
pipeline::Pipeline,
render::Render,
resources::Resources,
shader,
vertex::Vertex,
},
wgpu::{CommandEncoder, TextureView},
};
/// The type that represented a current frame
/// and creates new [layers](crate::Layer).
pub struct Frame<'d> {
render: &'d Render,
resources: &'d Resources,
encoder: Encoder,
frame_view: TextureView,
drawn_in_frame: bool,
}
impl<'d> Frame<'d> {
pub(crate) fn new(
render: &'d Render,
resources: &'d Resources,
frame_view: TextureView,
) -> Self {
Self {
render,
resources,
encoder: Encoder::default(),
frame_view,
drawn_in_frame: false,
}
}
/// Draws the frame in the screen buffer.
///
/// You usually don't need to call this method manually.
/// It is called automatically at the end of the [`Frame`] lifetime.
/// It can be useful if you want to partially render a frame in multiple layers.
///
/// # Example
/// ```
/// # #[derive(Clone, Copy)]
/// # struct Frame;
/// # impl Frame {
/// # fn texture_layer(self) -> Self { self }
/// # fn start(self) -> Self { self }
/// # fn commit_in_frame(self) {}
/// # }
/// # let frame = Frame;
/// // Create a new layer
/// let mut layer = frame
/// .texture_layer()
/// .start();
///
/// // Draw something in the layer
///
/// // Drop the layer to release a frame
/// drop(layer);
///
/// // Commit the layer in frame
/// frame.commit_in_frame();
/// ```
pub fn commit_in_frame(&mut self) {
use wgpu::*;
if !self.drawn_in_frame {
return;
}
self.drawn_in_frame = false;
{
let mut pass = self
.encoder
.get(self.render)
.begin_render_pass(&RenderPassDescriptor {
label: Some("post render pass"),
color_attachments: &[Some(RenderPassColorAttachment {
view: &self.frame_view,
resolve_target: None,
ops: Operations {
load: LoadOp::Load,
store: true,
},
})],
depth_stencil_attachment: None,
});
pass.set_pipeline(self.render.post_pipeline().as_ref());
pass.set_bind_group(
shader::POST_TEXTURE_GROUP,
self.render.framebuffer().render_bind_group(),
&[],
);
pass.set_bind_group(
shader::POST_DATA_GROUP,
self.render.post_shader_data().bind_group(),
&[],
);
pass.draw(0..4, 0..1);
}
self.encoder.finish(self.render);
}
/// Starts a [layer](crate::handles::LayerHandle).
///
/// # Errors
/// Returns [`Error::NotFound`] if given instance handler was deleted.
pub fn layer<V, T>(
&mut self,
handle: LayerHandle<V, T>,
) -> Result<Builder<'_, 'd, V, T>, ResourceNotFound> {
Ok(Builder::new(self, self.resources.layers.get(handle.id())?))
}
/// Creates a new [layer](crate::Layer).
pub(crate) fn start_layer<'l, V, T>(
&'l mut self,
pipeline: &'l Pipeline,
clear_color: Option<Linear<f32>>,
clear_depth: bool,
) -> Layer<V, T>
where
V: Vertex,
{
use wgpu::*;
// Before start a new layer, finish the previous one if it exists
self.encoder.finish(self.render);
let mut pass = self
.encoder
.get(self.render)
.begin_render_pass(&RenderPassDescriptor {
label: Some("layer render pass"),
color_attachments: &[Some(RenderPassColorAttachment {
view: self.render.framebuffer().render_view(),
resolve_target: None,
ops: Operations {
load: clear_color.map_or(LoadOp::Load, |Linear([r, g, b, a])| {
LoadOp::Clear(Color {
r: r as f64,
g: g as f64,
b: b as f64,
a: a as f64,
})
}),
store: true,
},
})],
depth_stencil_attachment: Some(RenderPassDepthStencilAttachment {
view: self.render.framebuffer().depth_view(),
depth_ops: Some(Operations {
load: if clear_depth {
LoadOp::Clear(1.)
} else {
LoadOp::Load
},
store: true,
}),
stencil_ops: None,
}),
});
pass.set_pipeline(pipeline.as_ref());
let (vw, vh) = self.render.screen().virtual_size();
pass.set_viewport(0., 0., vw as f32, vh as f32, 0., 1.);
Layer::new(
pass,
(vw, vh),
self.render.context().queue(),
self.resources,
&mut self.drawn_in_frame,
)
}
}
#[derive(Default)]
struct Encoder(Option<CommandEncoder>);
impl Encoder {
fn get(&mut self, render: &Render) -> &mut CommandEncoder {
use wgpu::CommandEncoderDescriptor;
self.0.get_or_insert_with(|| {
render
.context()
.device()
.create_command_encoder(&CommandEncoderDescriptor::default())
})
}
fn finish(&mut self, render: &Render) {
if let Some(encoder) = self.0.take() {
render.context().queue().submit([encoder.finish()]);
}
}
}