Tripod!

src/bin/wireframe/main.rs

@@ -30,11 +30,11 @@ impl<S: Copy> DragCtl<S> {
 	pub fn on_button(&mut self, pos: Vec2, state: ElementState) {
 		match state {
 			ElementState::Pressed => {
-				assert!(self.ctl.is_none());
+				if self.ctl.is_none() {
 					self.ctl = Some((pos, self.state));
 				}
+			}
 			ElementState::Released => {
-				assert!(self.ctl.is_some());
 				self.ctl = None;
 			}
 		}
@@ -60,23 +60,35 @@ fn main() {
 	let indices = glium::index::NoIndices(glium::index::PrimitiveType::LineLoop);
 	let shape = vec![
 		Vertex {
-			position: [-1., 0., 4.],
+			position: [0., 0., 0.],
 		},
 		Vertex {
-			position: [0., -1., 4.],
+			position: [1., 0., 0.],
 		},
 		Vertex {
-			position: [1., 0., 4.],
+			position: [0., 0., 0.],
 		},
 		Vertex {
-			position: [0., 1., 4.],
+			position: [0., 1., 0.],
+		},
+		Vertex {
+			position: [0., 0., 0.],
+		},
+		Vertex {
+			position: [0., 0., 1.],
 		},
 	];
 	let vertex_buffer = VertexBuffer::new(&display, &shape).unwrap();
 
+	let rot = Quat::from_euler(
+		glam::EulerRot::YXZ,
+		std::f32::consts::FRAC_PI_4,
+		std::f32::consts::FRAC_PI_6,
+		0.,
+	);
 	let mut cur_pos = vec2(0., 0.);
-	let mut cam_pos = DragCtl::new(Vec3::ZERO);
-	let mut cam_rot = DragCtl::new(Quat::IDENTITY);
+	let mut cam_pos = DragCtl::new(rot * vec3(0., 0., 4.));
+	let mut cam_rot = DragCtl::new(rot.inverse());
 
 	#[allow(deprecated)]
 	event_loop

src/bin/wireframe/ray.v.glsl

@@ -8,6 +8,6 @@ in vec3 position;
 out vec3 vertex_color;
 
 void main() {
-	vertex_color = color;
+	vertex_color = position;
 	gl_Position = mvp * vec4(position, 1.0);
 }