diff options
Diffstat (limited to 'rust/crates/masks/src/sdf.rs')
| -rw-r--r-- | rust/crates/masks/src/sdf.rs | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/rust/crates/masks/src/sdf.rs b/rust/crates/masks/src/sdf.rs new file mode 100644 index 00000000..0e7ec01a --- /dev/null +++ b/rust/crates/masks/src/sdf.rs @@ -0,0 +1,308 @@ +use bytemuck::{Pod, Zeroable}; +use gpu::{FULLSCREEN_SHADER_SOURCE, GPU_TEXTURE_FORMAT, GpuContext}; +use wgpu::util::DeviceExt; + +const JFA_INIT_SHADER_SOURCE: &str = include_str!("shaders/jfa_init.wgsl"); +const JFA_STEP_SHADER_SOURCE: &str = include_str!("shaders/jfa_step.wgsl"); + +pub struct SignedDistanceFieldTextures { + pub inside_texture: wgpu::Texture, + pub outside_texture: wgpu::Texture, +} + +pub struct SdfPipeline { + texture_bind_group_layout: wgpu::BindGroupLayout, + uniform_bind_group_layout: wgpu::BindGroupLayout, + init_pipeline: wgpu::RenderPipeline, + step_pipeline: wgpu::RenderPipeline, +} + +#[repr(C)] +#[derive(Clone, Copy, Pod, Zeroable)] +struct JfaInitUniformBuffer { + resolution: [f32; 2], + invert: f32, + _padding: f32, +} + +#[repr(C)] +#[derive(Clone, Copy, Pod, Zeroable)] +struct JfaStepUniformBuffer { + resolution: [f32; 2], + step_size: f32, + _padding: f32, +} + +impl SdfPipeline { + pub fn new(context: &GpuContext) -> Self { + let device = context.device(); + let texture_bind_group_layout = + device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { + label: Some("gpu-sdf-texture-bind-group-layout"), + entries: &[ + wgpu::BindGroupLayoutEntry { + binding: 0, + visibility: wgpu::ShaderStages::FRAGMENT, + ty: wgpu::BindingType::Texture { + multisampled: false, + view_dimension: wgpu::TextureViewDimension::D2, + sample_type: wgpu::TextureSampleType::Float { filterable: true }, + }, + count: None, + }, + wgpu::BindGroupLayoutEntry { + binding: 1, + visibility: wgpu::ShaderStages::FRAGMENT, + ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering), + count: None, + }, + ], + }); + let uniform_bind_group_layout = + device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { + label: Some("gpu-sdf-uniform-bind-group-layout"), + entries: &[wgpu::BindGroupLayoutEntry { + binding: 0, + visibility: wgpu::ShaderStages::FRAGMENT, + ty: wgpu::BindingType::Buffer { + ty: wgpu::BufferBindingType::Uniform, + has_dynamic_offset: false, + min_binding_size: None, + }, + count: None, + }], + }); + let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor { + label: Some("gpu-sdf-pipeline-layout"), + bind_group_layouts: &[ + Some(&texture_bind_group_layout), + Some(&uniform_bind_group_layout), + ], + immediate_size: 0, + }); + let vertex_shader_module = device.create_shader_module(wgpu::ShaderModuleDescriptor { + label: Some("gpu-sdf-fullscreen-shader"), + source: wgpu::ShaderSource::Wgsl(FULLSCREEN_SHADER_SOURCE.into()), + }); + let init_shader_module = device.create_shader_module(wgpu::ShaderModuleDescriptor { + label: Some("gpu-jfa-init-shader"), + source: wgpu::ShaderSource::Wgsl(JFA_INIT_SHADER_SOURCE.into()), + }); + let step_shader_module = device.create_shader_module(wgpu::ShaderModuleDescriptor { + label: Some("gpu-jfa-step-shader"), + source: wgpu::ShaderSource::Wgsl(JFA_STEP_SHADER_SOURCE.into()), + }); + let init_pipeline = create_pipeline( + device, + "gpu-jfa-init-pipeline", + &pipeline_layout, + &vertex_shader_module, + &init_shader_module, + ); + let step_pipeline = create_pipeline( + device, + "gpu-jfa-step-pipeline", + &pipeline_layout, + &vertex_shader_module, + &step_shader_module, + ); + + Self { + texture_bind_group_layout, + uniform_bind_group_layout, + init_pipeline, + step_pipeline, + } + } + + pub fn compute_signed_distance_field( + &self, + context: &GpuContext, + source_texture: &wgpu::Texture, + width: u32, + height: u32, + ) -> SignedDistanceFieldTextures { + SignedDistanceFieldTextures { + inside_texture: self.run_jfa(context, source_texture, width, height, false), + outside_texture: self.run_jfa(context, source_texture, width, height, true), + } + } + + fn run_jfa( + &self, + context: &GpuContext, + source_texture: &wgpu::Texture, + width: u32, + height: u32, + is_inverted: bool, + ) -> wgpu::Texture { + let ping_texture = context.create_render_texture(width, height, "gpu-jfa-ping-texture"); + let pong_texture = context.create_render_texture(width, height, "gpu-jfa-pong-texture"); + + self.run_pass( + context, + source_texture, + &ping_texture, + &self.init_pipeline, + bytemuck::bytes_of(&JfaInitUniformBuffer { + resolution: [width as f32, height as f32], + invert: if is_inverted { 1.0 } else { 0.0 }, + _padding: 0.0, + }), + ); + + let mut source_is_ping = true; + let steps = (width.max(height) as f32).log2().ceil() as u32; + for step_index in (0..steps).rev() { + let step_size = 2u32.pow(step_index).max(1); + let input_texture = if source_is_ping { + &ping_texture + } else { + &pong_texture + }; + let output_texture = if source_is_ping { + &pong_texture + } else { + &ping_texture + }; + self.run_pass( + context, + input_texture, + output_texture, + &self.step_pipeline, + bytemuck::bytes_of(&JfaStepUniformBuffer { + resolution: [width as f32, height as f32], + step_size: step_size as f32, + _padding: 0.0, + }), + ); + source_is_ping = !source_is_ping; + } + + if source_is_ping { + ping_texture + } else { + pong_texture + } + } + + fn run_pass( + &self, + context: &GpuContext, + input_texture: &wgpu::Texture, + output_texture: &wgpu::Texture, + pipeline: &wgpu::RenderPipeline, + uniform_buffer_bytes: &[u8], + ) { + let input_view = input_texture.create_view(&wgpu::TextureViewDescriptor::default()); + let output_view = output_texture.create_view(&wgpu::TextureViewDescriptor::default()); + let texture_bind_group = context + .device() + .create_bind_group(&wgpu::BindGroupDescriptor { + label: Some("gpu-sdf-texture-bind-group"), + layout: &self.texture_bind_group_layout, + entries: &[ + wgpu::BindGroupEntry { + binding: 0, + resource: wgpu::BindingResource::TextureView(&input_view), + }, + wgpu::BindGroupEntry { + binding: 1, + resource: wgpu::BindingResource::Sampler(context.nearest_sampler()), + }, + ], + }); + let uniform_buffer = + context + .device() + .create_buffer_init(&wgpu::util::BufferInitDescriptor { + label: Some("gpu-sdf-uniform-buffer"), + contents: uniform_buffer_bytes, + usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST, + }); + let uniform_bind_group = context + .device() + .create_bind_group(&wgpu::BindGroupDescriptor { + label: Some("gpu-sdf-uniform-bind-group"), + layout: &self.uniform_bind_group_layout, + entries: &[wgpu::BindGroupEntry { + binding: 0, + resource: uniform_buffer.as_entire_binding(), + }], + }); + let mut encoder = + context + .device() + .create_command_encoder(&wgpu::CommandEncoderDescriptor { + label: Some("gpu-sdf-command-encoder"), + }); + + { + let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor { + label: Some("gpu-sdf-render-pass"), + color_attachments: &[Some(wgpu::RenderPassColorAttachment { + view: &output_view, + resolve_target: None, + depth_slice: None, + ops: wgpu::Operations { + load: wgpu::LoadOp::Clear(wgpu::Color::WHITE), + store: wgpu::StoreOp::Store, + }, + })], + depth_stencil_attachment: None, + occlusion_query_set: None, + timestamp_writes: None, + multiview_mask: None, + }); + render_pass.set_pipeline(pipeline); + render_pass.set_vertex_buffer(0, context.fullscreen_quad().slice(..)); + render_pass.set_bind_group(0, &texture_bind_group, &[]); + render_pass.set_bind_group(1, &uniform_bind_group, &[]); + render_pass.draw(0..6, 0..1); + } + + context.queue().submit([encoder.finish()]); + } +} + +fn create_pipeline( + device: &wgpu::Device, + label: &'static str, + layout: &wgpu::PipelineLayout, + vertex_shader_module: &wgpu::ShaderModule, + fragment_shader_module: &wgpu::ShaderModule, +) -> wgpu::RenderPipeline { + device.create_render_pipeline(&wgpu::RenderPipelineDescriptor { + label: Some(label), + layout: Some(layout), + vertex: wgpu::VertexState { + module: vertex_shader_module, + entry_point: Some("vertex_main"), + buffers: &[wgpu::VertexBufferLayout { + array_stride: std::mem::size_of::<[f32; 2]>() as u64, + step_mode: wgpu::VertexStepMode::Vertex, + attributes: &[wgpu::VertexAttribute { + format: wgpu::VertexFormat::Float32x2, + offset: 0, + shader_location: 0, + }], + }], + compilation_options: wgpu::PipelineCompilationOptions::default(), + }, + fragment: Some(wgpu::FragmentState { + module: fragment_shader_module, + entry_point: Some("fragment_main"), + targets: &[Some(wgpu::ColorTargetState { + format: GPU_TEXTURE_FORMAT, + blend: None, + write_mask: wgpu::ColorWrites::ALL, + })], + compilation_options: wgpu::PipelineCompilationOptions::default(), + }), + primitive: wgpu::PrimitiveState::default(), + depth_stencil: None, + multisample: wgpu::MultisampleState::default(), + multiview_mask: None, + cache: None, + }) +} |