use crate::core::{Size, Transformation}; use crate::graphics; use std::num::NonZeroU64; #[derive(Debug)] pub struct Blit { format: wgpu::TextureFormat, pipeline: wgpu::RenderPipeline, constants: wgpu::BindGroup, ratio: wgpu::Buffer, texture_layout: wgpu::BindGroupLayout, sample_count: u32, targets: Option, last_region: Option>, } impl Blit { pub fn new( device: &wgpu::Device, format: wgpu::TextureFormat, antialiasing: graphics::Antialiasing, ) -> Blit { let sampler = device.create_sampler(&wgpu::SamplerDescriptor::default()); let ratio = device.create_buffer(&wgpu::BufferDescriptor { label: Some("iced-wgpu::triangle::msaa ratio"), size: std::mem::size_of::() as u64, usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::UNIFORM, mapped_at_creation: false, }); let constant_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { label: Some("iced_wgpu::triangle:msaa uniforms layout"), entries: &[ wgpu::BindGroupLayoutEntry { binding: 0, visibility: wgpu::ShaderStages::FRAGMENT, ty: wgpu::BindingType::Sampler( wgpu::SamplerBindingType::NonFiltering, ), count: None, }, wgpu::BindGroupLayoutEntry { binding: 1, visibility: wgpu::ShaderStages::VERTEX, ty: wgpu::BindingType::Buffer { ty: wgpu::BufferBindingType::Uniform, has_dynamic_offset: false, min_binding_size: None, }, count: None, }, ], }); let constant_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor { label: Some("iced_wgpu::triangle::msaa uniforms bind group"), layout: &constant_layout, entries: &[ wgpu::BindGroupEntry { binding: 0, resource: wgpu::BindingResource::Sampler(&sampler), }, wgpu::BindGroupEntry { binding: 1, resource: ratio.as_entire_binding(), }, ], }); let texture_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { label: Some("iced_wgpu::triangle::msaa texture layout"), entries: &[wgpu::BindGroupLayoutEntry { binding: 0, visibility: wgpu::ShaderStages::FRAGMENT, ty: wgpu::BindingType::Texture { sample_type: wgpu::TextureSampleType::Float { filterable: false, }, view_dimension: wgpu::TextureViewDimension::D2, multisampled: false, }, count: None, }], }); let layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor { label: Some("iced_wgpu::triangle::msaa pipeline layout"), push_constant_ranges: &[], bind_group_layouts: &[&constant_layout, &texture_layout], }); let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor { label: Some("iced_wgpu triangle blit_shader"), source: wgpu::ShaderSource::Wgsl(std::borrow::Cow::Borrowed( include_str!("../shader/blit.wgsl"), )), }); let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor { label: Some("iced_wgpu::triangle::msaa pipeline"), layout: Some(&layout), vertex: wgpu::VertexState { module: &shader, entry_point: "vs_main", buffers: &[], }, fragment: Some(wgpu::FragmentState { module: &shader, entry_point: "fs_main", targets: &[Some(wgpu::ColorTargetState { format, blend: Some( wgpu::BlendState::PREMULTIPLIED_ALPHA_BLENDING, ), write_mask: wgpu::ColorWrites::ALL, })], }), 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, }); Blit { format, pipeline, constants: constant_bind_group, ratio, texture_layout, sample_count: antialiasing.sample_count(), targets: None, last_region: None, } } pub fn prepare( &mut self, device: &wgpu::Device, encoder: &mut wgpu::CommandEncoder, belt: &mut wgpu::util::StagingBelt, region_size: Size, ) -> Transformation { match &mut self.targets { Some(targets) if region_size.width <= targets.size.width && region_size.height <= targets.size.height => {} _ => { self.targets = Some(Targets::new( device, self.format, &self.texture_layout, self.sample_count, region_size, )); } } let targets = self.targets.as_mut().unwrap(); if Some(region_size) != self.last_region { let ratio = Ratio { u: region_size.width as f32 / targets.size.width as f32, v: region_size.height as f32 / targets.size.height as f32, }; belt.write_buffer( encoder, &self.ratio, 0, NonZeroU64::new(std::mem::size_of::() as u64) .expect("non-empty ratio"), device, ) .copy_from_slice(bytemuck::bytes_of(&ratio)); self.last_region = Some(region_size); } Transformation::orthographic(targets.size.width, targets.size.height) } pub fn targets(&self) -> (&wgpu::TextureView, &wgpu::TextureView) { let targets = self.targets.as_ref().unwrap(); (&targets.attachment, &targets.resolve) } pub fn draw( &self, encoder: &mut wgpu::CommandEncoder, target: &wgpu::TextureView, ) { let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor { label: Some("iced_wgpu::triangle::msaa render pass"), color_attachments: &[Some(wgpu::RenderPassColorAttachment { view: target, resolve_target: None, ops: wgpu::Operations { load: wgpu::LoadOp::Load, store: wgpu::StoreOp::Store, }, })], depth_stencil_attachment: None, timestamp_writes: None, occlusion_query_set: None, }); render_pass.set_pipeline(&self.pipeline); render_pass.set_bind_group(0, &self.constants, &[]); render_pass.set_bind_group( 1, &self.targets.as_ref().unwrap().bind_group, &[], ); render_pass.draw(0..6, 0..1); } } #[derive(Debug)] struct Targets { attachment: wgpu::TextureView, resolve: wgpu::TextureView, bind_group: wgpu::BindGroup, size: Size, } impl Targets { pub fn new( device: &wgpu::Device, format: wgpu::TextureFormat, texture_layout: &wgpu::BindGroupLayout, sample_count: u32, size: Size, ) -> Targets { let extent = wgpu::Extent3d { width: size.width, height: size.height, depth_or_array_layers: 1, }; let attachment = device.create_texture(&wgpu::TextureDescriptor { label: Some("iced_wgpu::triangle::msaa attachment"), size: extent, mip_level_count: 1, sample_count, dimension: wgpu::TextureDimension::D2, format, usage: wgpu::TextureUsages::RENDER_ATTACHMENT, view_formats: &[], }); let resolve = device.create_texture(&wgpu::TextureDescriptor { label: Some("iced_wgpu::triangle::msaa resolve target"), size: extent, mip_level_count: 1, sample_count: 1, dimension: wgpu::TextureDimension::D2, format, usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::TEXTURE_BINDING, view_formats: &[], }); let attachment = attachment.create_view(&wgpu::TextureViewDescriptor::default()); let resolve = resolve.create_view(&wgpu::TextureViewDescriptor::default()); let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor { label: Some("iced_wgpu::triangle::msaa texture bind group"), layout: texture_layout, entries: &[wgpu::BindGroupEntry { binding: 0, resource: wgpu::BindingResource::TextureView(&resolve), }], }); Targets { attachment, resolve, bind_group, size, } } } #[derive(Debug, Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)] #[repr(C)] struct Ratio { u: f32, v: f32, }