src/bin/minitracer/main.rs

@@ -1,7 +1,6 @@
 use std::error::Error;
 
-use glam::{uvec2, vec2};
+use glam::uvec2;
-use raytracing3::glare::Glarer;
 use raytracing3::present::{self, Presenter};
 use raytracing3::scene::{load_envmap, Renderer, SceneParams};
 use winit::{
@@ -29,7 +28,6 @@ fn main() {
 	let hdr_format = wgpu::TextureFormat::Rgba16Float;
 	let scene = SceneParams::new(N_SPHERES);
 	let renderer = Renderer::new(&device, envmap);
-	let glarer = Glarer::new(&device, hdr_format);
 	let presenter = Presenter::new(&device, output_format);
 
 	let mut frame = 0;
@@ -75,13 +73,13 @@ fn main() {
 						usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::TEXTURE_BINDING,
 						view_formats: &[],
 					});
-					let hdr1v = hdr.create_view(&wgpu::TextureViewDescriptor::default());
+					let hdr = hdr.create_view(&wgpu::TextureViewDescriptor::default());
 					let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
 					{
-						let mut render_pass = renderer.prepare(&mut encoder, &hdr1v);
+						let mut render_pass = renderer.prepare(&mut encoder, &hdr);
-						let time = frame as f32 / (60. * RAYS_PER_PIXEL as f32);
 						for _ in 0..RAYS_PER_PIXEL {
 							frame += 1;
+							let time = frame as f32 / (60. * RAYS_PER_PIXEL as f32);
 							renderer.render_frame(
 								&device,
 								&mut render_pass,
@@ -92,12 +90,10 @@ fn main() {
 							);
 						}
 					}
-					let sigma = vec2(size.width as f32, size.height as f32).length();
-					glarer.render(&device, &mut encoder, &hdr, raytracing3::glare::Params { sigma });
 					presenter.render(
 						&device,
 						&mut encoder,
-						&hdr1v,
+						&hdr,
 						&view,
 						present::Params {
 							divisor: RAYS_PER_PIXEL as f32,

src/glare.rs

@@ -1,222 +0,0 @@
-use std::mem::offset_of;
-
-use bytemuck::{bytes_of, Pod, Zeroable};
-use glam::{vec2, UVec2, Vec2};
-use wgpu::util::DeviceExt;
-
-#[derive(Debug, Clone, Copy, Pod, Zeroable)]
-#[repr(C)]
-struct Vertex {
-	pub screen: Vec2,
-}
-
-#[derive(Debug, Clone, Copy, Pod, Zeroable)]
-#[repr(C)]
-pub struct Params {
-	pub sigma: f32, // in pixels
-}
-
-pub struct Glarer {
-	view_buf: wgpu::Buffer,
-	format: wgpu::TextureFormat,
-	pipeline_h: wgpu::RenderPipeline,
-	pipeline_v: wgpu::RenderPipeline,
-}
-
-static SHADER: &str = include_str!("glare.wgsl");
-
-impl Glarer {
-	pub fn new(device: &wgpu::Device, format: wgpu::TextureFormat) -> Self {
-		let view_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-			label: None,
-			contents: bytes_of(&[(0., 0.), (1., 0.), (0., 1.), (1., 1.)].map(|(x, y)| Vertex { screen: vec2(x, y) })),
-			usage: wgpu::BufferUsages::VERTEX,
-		});
-		let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
-			label: None,
-			source: wgpu::ShaderSource::Wgsl(SHADER.into()),
-		});
-		let vertex_state = wgpu::VertexState {
-			module: &shader,
-			entry_point: None,
-			compilation_options: wgpu::PipelineCompilationOptions::default(),
-			buffers: &[wgpu::VertexBufferLayout {
-				array_stride: size_of::<Vertex>() as u64,
-				step_mode: wgpu::VertexStepMode::Vertex,
-				attributes: &[wgpu::VertexAttribute {
-					shader_location: 0,
-					offset: offset_of!(Vertex, screen) as u64,
-					format: wgpu::VertexFormat::Float32x2,
-				}],
-			}],
-		};
-		let pipeline1 = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
-			label: None,
-			layout: None,
-			vertex: vertex_state.clone(),
-			primitive: wgpu::PrimitiveState {
-				topology: wgpu::PrimitiveTopology::TriangleStrip,
-				..Default::default()
-			},
-			depth_stencil: None,
-			multisample: wgpu::MultisampleState::default(),
-			fragment: Some(wgpu::FragmentState {
-				module: &shader,
-				entry_point: Some("pass_h"),
-				compilation_options: wgpu::PipelineCompilationOptions::default(),
-				targets: &[Some(wgpu::ColorTargetState {
-					format,
-					blend: Some(wgpu::BlendState::REPLACE),
-					write_mask: wgpu::ColorWrites::ALL,
-				})],
-			}),
-			multiview: None,
-			cache: None,
-		});
-		let pipeline2 = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
-			label: None,
-			layout: None,
-			vertex: vertex_state.clone(),
-			primitive: wgpu::PrimitiveState {
-				topology: wgpu::PrimitiveTopology::TriangleStrip,
-				..Default::default()
-			},
-			depth_stencil: None,
-			multisample: wgpu::MultisampleState::default(),
-			fragment: Some(wgpu::FragmentState {
-				module: &shader,
-				entry_point: Some("pass_v"),
-				compilation_options: wgpu::PipelineCompilationOptions::default(),
-				targets: &[Some(wgpu::ColorTargetState {
-					format,
-					blend: Some(wgpu::BlendState {
-						color: wgpu::BlendComponent {
-							src_factor: wgpu::BlendFactor::One,
-							dst_factor: wgpu::BlendFactor::One,
-							operation: wgpu::BlendOperation::Add,
-						},
-						alpha: wgpu::BlendComponent {
-							src_factor: wgpu::BlendFactor::One,
-							dst_factor: wgpu::BlendFactor::One,
-							operation: wgpu::BlendOperation::Add,
-						},
-					}),
-					write_mask: wgpu::ColorWrites::ALL,
-				})],
-			}),
-			multiview: None,
-			cache: None,
-		});
-		Self {
-			view_buf,
-			format,
-			pipeline_h: pipeline1,
-			pipeline_v: pipeline2,
-		}
-	}
-
-	pub fn render(
-		&self,
-		device: &wgpu::Device,
-		encoder: &mut wgpu::CommandEncoder,
-		source: &wgpu::Texture,
-		// target: &wgpu::Texture,
-		params: Params,
-	) {
-		let target = source;
-		let size = target.size();
-		// assert_eq!(source.size(), size);
-		let intermediate = device.create_texture(&wgpu::TextureDescriptor {
-			label: None,
-			size,
-			mip_level_count: 1,
-			sample_count: 1,
-			dimension: wgpu::TextureDimension::D2,
-			format: self.format,
-			usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::RENDER_ATTACHMENT,
-			view_formats: &[],
-		});
-		let intermediate = intermediate.create_view(&wgpu::TextureViewDescriptor::default());
-		let params_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-			label: None,
-			contents: bytes_of(&params),
-			usage: wgpu::BufferUsages::UNIFORM,
-		});
-		let source = &source.create_view(&wgpu::TextureViewDescriptor::default());
-		let target = &target.create_view(&wgpu::TextureViewDescriptor::default());
-		{
-			let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
-				label: None,
-				color_attachments: &[Some(wgpu::RenderPassColorAttachment {
-					view: &intermediate,
-					resolve_target: None,
-					ops: wgpu::Operations {
-						load: wgpu::LoadOp::Clear(wgpu::Color::TRANSPARENT),
-						store: wgpu::StoreOp::Store,
-					},
-				})],
-				depth_stencil_attachment: None,
-				occlusion_query_set: None,
-				timestamp_writes: None,
-			});
-			let bindings = device.create_bind_group(&wgpu::BindGroupDescriptor {
-				label: None,
-				layout: &self.pipeline_h.get_bind_group_layout(0),
-				entries: &[
-					wgpu::BindGroupEntry {
-						binding: 1,
-						resource: wgpu::BindingResource::TextureView(source),
-					},
-					wgpu::BindGroupEntry {
-						binding: 2,
-						resource: params_buf.as_entire_binding(),
-					},
-				],
-			});
-			pass.set_pipeline(&self.pipeline_h);
-			pass.set_vertex_buffer(0, self.view_buf.slice(..));
-			pass.set_bind_group(0, &bindings, &[]);
-			pass.draw(0..4, 0..1);
-		}
-		{
-			let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
-				label: None,
-				color_attachments: &[Some(wgpu::RenderPassColorAttachment {
-					view: target,
-					resolve_target: None,
-					ops: wgpu::Operations {
-						// load: wgpu::LoadOp::Load,
-						load: wgpu::LoadOp::Clear(wgpu::Color::TRANSPARENT),
-						store: wgpu::StoreOp::Store,
-					},
-				})],
-				depth_stencil_attachment: None,
-				occlusion_query_set: None,
-				timestamp_writes: None,
-			});
-			let params_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-				label: None,
-				contents: bytes_of(&params),
-				usage: wgpu::BufferUsages::UNIFORM,
-			});
-			let bindings = device.create_bind_group(&wgpu::BindGroupDescriptor {
-				label: None,
-				layout: &self.pipeline_v.get_bind_group_layout(0),
-				entries: &[
-					wgpu::BindGroupEntry {
-						binding: 1,
-						resource: wgpu::BindingResource::TextureView(&intermediate),
-					},
-					wgpu::BindGroupEntry {
-						binding: 2,
-						resource: params_buf.as_entire_binding(),
-					},
-				],
-			});
-			pass.set_pipeline(&self.pipeline_v);
-			pass.set_vertex_buffer(0, self.view_buf.slice(..));
-			pass.set_bind_group(0, &bindings, &[]);
-			pass.draw(0..4, 0..1);
-		}
-	}
-}

src/glare.wgsl

@@ -1,81 +0,0 @@
-struct Params {
-	sigma: f32,
-}
-
-struct Vertex {
-	@location(0) screen: vec2f,
-}
-
-struct Varying {
-	@location(0) tex: vec2f,
-	@builtin(position) v: vec4f,
-}
-
-@group(0) @binding(1) var tex: texture_2d<f32>;
-@group(0) @binding(2) var<uniform> params: Params;
-
-@vertex
-fn on_vertex(in: Vertex) -> Varying {
-	let uv = in.screen;
-	let xy = vec2(2. * uv.x - 1., 1. - 2. * uv.y);
-	return Varying(uv, vec4(xy, 0., 1.));
-}
-
-const CUTOFF: i32 = 10000;
-
-@fragment
-fn pass_h(in: Varying) -> @location(0) vec4f {
-	let size = vec2i(textureDimensions(tex));
-	let pix = vec2i(floor(in.tex * vec2f(size)));
-	let a = max(0, pix.x - CUTOFF);
-	let b = min(size.x, pix.x + CUTOFF + 1);
-	var accum = vec4(0.);
-	for (var x = a; x < b; x++) {
-		let w = weight(x - pix.x);
-		let pixel = textureLoad(tex, vec2i(x, pix.y), 0);
-		accum += w * pixel;
-	}
-	return vec4(accum.xyz, params.sigma);
-}
-
-@fragment
-fn pass_v(in: Varying) -> @location(0) vec4f {
-	let size = vec2i(textureDimensions(tex));
-	let pix = vec2i(floor(in.tex * vec2f(size)));
-	let a = max(0, pix.y - CUTOFF);
-	let b = min(size.y, pix.y + CUTOFF + 1);
-	var accum = vec4(0.);
-	for (var y = a; y < b; y++) {
-		let w = weight(y - pix.y);
-		let pixel = textureLoad(tex, vec2i(pix.x, y), 0);
-		accum += w * pixel;
-	}
-	return vec4(accum.xyz, params.sigma);
-}
-
-// fn weight(dist: i32) -> f32 {
-// 	let σ = 50.;
-// 	let d = f32(dist);
-// 	let w = max(0., 1. - abs(d) / σ) / σ;
-// 	return .1 * w;
-// }
-
-// fn weight(dist: i32) -> f32 {
-// 	let σ = params.sigma / 3000.;
-// 	let d = f32(dist) / σ;
-// 	return .1 / (1. + d*d) / σ;
-// }
-
-// fn weight(dist: i32) -> f32 {
-// 	let σ = params.sigma / 300.;
-// 	let d = abs(f32(dist) / σ);
-// 	return 1. / (1. + d*d*d) / σ;
-// }
-
-fn weight(dist: i32) -> f32 {
-	let d = f32(abs(dist));
-	let c = mix(.01, 1., exp(-d*d));
-// 	return c * pow(1.2, -d);
-	return c / (1. + pow(d, 2.0));
-// 	return .25 * c / (1. + pow(.1 * d, 4.0));
-}

src/lib.rs

@@ -1,5 +1,4 @@
 pub mod anim;
-pub mod glare;
 pub mod perlin;
 pub mod present;
 pub mod scene;

src/scene.rs

@@ -125,6 +125,8 @@ impl Renderer {
 			trace::Aperture {
 				radius: 0.0003,
 				focal_distance: std::f32::INFINITY,
+				glare_strength: 0.1,
+				glare_radius: 0.1,
 			},
 			location,
 		);

src/trace.rs

@@ -22,6 +22,8 @@ pub struct Viewport {
 pub struct Aperture {
 	pub radius: f32,
 	pub focal_distance: f32, // from 0 (exclusive) to +∞ (inclusive)
+	pub glare_strength: f32,
+	pub glare_radius: f32, // at distance 1
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -48,6 +50,8 @@ struct CameraData {
 	aperture: f32,
 	eye: Vec3,
 	antifocal: f32,
+	glare_strength: f32,
+	glare_radius: f32,
 }
 
 impl From<(Viewport, CameraLocation, Aperture)> for CameraData {
@@ -61,6 +65,8 @@ impl From<(Viewport, CameraLocation, Aperture)> for CameraData {
 			height: value.0.corner.y / value.0.corner.z,
 			aperture: value.2.radius,
 			antifocal: 1. / value.2.focal_distance,
+			glare_strength: value.2.glare_strength,
+			glare_radius: value.2.glare_radius,
 		}
 	}
 }

src/trace.wgsl

@@ -12,6 +12,9 @@ struct Params {
 	aperture: f32,
 	eye: vec3f,
 	antifocal: f32,
+
+	glare_strength: f32,
+	glare_radius: f32,
 }
 
 struct Sphere {
@@ -82,6 +85,12 @@ fn trace_fragment(in: Varying) -> vec3f {
 	let off_px = vec2(rand_float(), rand_float()) - .5;
 	let off_w = mat2x3(dpdx(in.dir), dpdy(in.dir));
 	var dir = in.dir + off_w * off_px;
+	if (rand_float() < params.glare_strength) {
+		let p = rand_float();
+		let d = params.glare_radius * pow(p, 2.);
+		let glare_off = d * rand_disc();
+		dir += view_mtx * vec3(glare_off, 0.);
+	}
 	ray = normalize(dir - params.antifocal * aperture_offset_abs);
 
 	for (var k = 0; k < params.max_reflections; k++) {