add light

src/lib.rs

@@ -109,13 +109,20 @@ impl Core {
 		let camera = camera::OrbitalCamera {
 			position_yaw: args.camera_yaw,
 			position_pitch: args.camera_pitch,
-			distance: 5. * args.shape.base_diameter,
+			distance: 160.,
+		};
+		let light = camera::OrbitalCamera {
+			position_yaw: args.light_yaw,
+			position_pitch: args.light_pitch,
+			distance: 1.,
 		};
 		let perspective = Mat4::perspective_lh(std::f32::consts::FRAC_PI_3, aspect, 1e1, 1e3);
 		self.pipeline.set_look(
 			&self.queue,
 			render::LookParams {
 				m: perspective * camera.transform(),
+				light: light.direction(),
+				bright: 1.,
 			},
 		);
 		self.queue.submit([]); // flush buffer updates

src/mesh.wgsl

@@ -1,5 +1,7 @@
 struct LookParams {
 	m: mat4x4f,
+	light: vec3f,
+	bright: f32,
 }
 
 struct Vertex {
@@ -23,5 +25,6 @@ fn on_vertex(in: Vertex) -> Varying {
 
 @fragment
 fn on_fragment(in: Varying) -> @location(0) vec4f {
-	return vec4f(0.5 + 0.5 * in.normal, 1.0);
+	let light = -dot(look.light, in.normal);
+	return vec4f(clamp(light, 0.01, 1.0) * vec3f(1.0), 1.0);
 }

src/render.rs

@@ -12,6 +12,8 @@ static MESH_SHADER: &str = include_str!("mesh.wgsl");
 #[repr(C)]
 pub struct LookParams {
 	pub m: Mat4,
+	pub light: Vec3,
+	pub bright: f32,
 }
 
 #[derive(Debug, Clone, Copy, Zeroable, Pod)]

ui/src/main_window.ui

@@ -274,9 +274,9 @@
          <widget class="KColorCombo" name="inBackground">
           <property name="color">
            <color>
-            <red>85</red>
-            <green>170</green>
-            <blue>255</blue>
+            <red>0</red>
+            <green>0</green>
+            <blue>0</blue>
            </color>
           </property>
          </widget>