Blend!

src/bin/wireframe/main.rs

@@ -3,11 +3,12 @@ use std::{collections::HashSet, time::Instant};
 use glam::{mat4, vec2, vec3, vec4, Mat4, Quat, Vec2, Vec3};
 use glium::{
 	backend::{glutin::SimpleWindowBuilder, Facade},
+	glutin::config::ConfigTemplateBuilder,
 	implement_vertex,
 	index::PrimitiveType,
 	uniform,
 	winit::event::{Event, WindowEvent},
-	Program, Surface, VertexBuffer,
+	DrawParameters, Program, Surface, VertexBuffer,
 };
 use winit::{
 	event::ElementState,
@@ -99,7 +100,9 @@ fn prepare_scene(display: &impl Facade) -> Vec<Wireframe> {
 
 fn main() {
 	let event_loop = EventLoop::builder().build().unwrap();
+	let cfg = ConfigTemplateBuilder::new().with_multisampling(8);
 	let (window, display) = SimpleWindowBuilder::new()
+		.with_config_template_builder(cfg)
 		.with_title("Refraction: Wireframe")
 		.build(&event_loop);
 
@@ -178,7 +181,7 @@ fn main() {
 						* Mat4::from_translation(-cam_pos);
 
 					let mut target = display.draw();
-					target.clear_color(0.0, 0.0, 0.2, 1.0);
+					target.clear_color(0.0, 0.0, 0.0, 0.0);
 
 					let mvp = proj * view;
 					let uniforms = uniform! {
@@ -194,6 +197,22 @@ fn main() {
 							&Default::default(),
 						)
 						.unwrap();
+					let params = DrawParameters {
+						blend: glium::Blend {
+							color: glium::BlendingFunction::Addition {
+								source: glium::LinearBlendingFactor::One,
+								destination: glium::LinearBlendingFactor::OneMinusSourceAlpha,
+							},
+							alpha: glium::BlendingFunction::Addition {
+								source: glium::LinearBlendingFactor::One,
+								destination: glium::LinearBlendingFactor::OneMinusSourceAlpha,
+							},
+							constant_value: (0., 0., 0., 0.),
+						},
+						line_width: Some(3.),
+						smooth: Some(glium::Smooth::Nicest),
+						..Default::default()
+					};
 					for mesh in &scene {
 						let uniforms = uniform! {
 							mvp: mvp.to_cols_array_2d(),
@@ -201,13 +220,7 @@ fn main() {
 						};
 						let indices = glium::index::NoIndices(mesh.mode);
 						target
-							.draw(
-								&mesh.data,
-								&indices,
-								&program,
-								&uniforms,
-								&Default::default(),
-							)
+							.draw(&mesh.data, &indices, &program, &uniforms, &params)
 							.unwrap();
 					}
 					target.finish().unwrap();

src/bin/wireframe/ray.f.glsl

@@ -5,5 +5,6 @@ in vec3 vertex_color;
 out vec4 color;
 
 void main() {
-	color = vec4(vertex_color, 1.0);
+	float opacity = pow(0.5 - 0.5 * gl_FragCoord.z, 0.25);
+	color = opacity * vec4(vertex_color, 1.0);
 }