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Rotation-independent line width

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This commit is contained in:
numzero 2024-09-23 22:14:13 +03:00
parent dca80473d0
commit 1d57ca8a93
2 changed files with 15 additions and 14 deletions
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25
src/bin/wireframe/main.rs
View File

@ -157,6 +157,8 @@ static KEYS_ROTATE: &'static [(PhysicalKey, Vec3)] = &[
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
struct CameraUniform {
mvp: [[f32; 4]; 4],
scale: [f32; 2],
pad: [u32; 2],
}
#[repr(C)]
@ -178,7 +180,6 @@ struct State<'a> {
cam: camctl::CameraLocation,
t1: Instant,
camera_uniform: CameraUniform,
camera_buffer: wgpu::Buffer,
camera_bind_group: wgpu::BindGroup,
@ -242,13 +243,11 @@ impl<'a> State<'a> {
let cam = camctl::CameraLocation::new();
let t1 = Instant::now();
let camera_uniform = CameraUniform {
mvp: cam.view_mtx().to_cols_array_2d(),
};
let camera_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
let camera_buffer = device.create_buffer(&wgpu::BufferDescriptor {
label: Some("Camera Buffer"),
contents: bytemuck::cast_slice(&[camera_uniform]),
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
size: mem::size_of::<CameraUniform>() as u64,
mapped_at_creation: false,
});
let camera_bind_group_layout =
device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
@ -357,7 +356,6 @@ impl<'a> State<'a> {
scene,
camera_buffer,
camera_bind_group,
camera_uniform,
window,
}
}
@ -398,12 +396,13 @@ impl<'a> State<'a> {
);
let view = my_to_gl * self.cam.view_mtx();
let mvp = proj * view;
self.camera_uniform.mvp = mvp.to_cols_array_2d();
self.queue.write_buffer(
&self.camera_buffer,
0,
bytemuck::cast_slice(&[self.camera_uniform]),
);
let camera_uniform = CameraUniform {
mvp: mvp.to_cols_array_2d(),
scale: (1. / size).to_array(),
pad: [0; 2],
};
self.queue
.write_buffer(&self.camera_buffer, 0, bytemuck::bytes_of(&camera_uniform));
}
fn render(&mut self) -> Result<(), wgpu::SurfaceError> {

4
src/bin/wireframe/ray.wgsl
View File

@ -1,5 +1,6 @@
struct CameraUniform {
mvp: mat4x4<f32>,
scale: vec2<f32>,
}
@group(0) @binding(0)
var<uniform> camera: CameraUniform;
@ -30,7 +31,8 @@ fn vs_main(seg: SegmentInput, off: OffsetInput) -> VertexOutput {
let a = camera.mvp * vec4(seg.a, 1.);
let b = camera.mvp * vec4(seg.b, 1.);
let dir = normalize(b.xy / b.w - a.xy / a.w);
let d = width * vec4(-dir.y, dir.x, 0., 0.);
let ortho = width * camera.scale * vec2(-dir.y, dir.x);
let d = vec4(ortho, 0., 0.);
switch (off.idx) {
case 0u: { out.clip_position = a - d; }
case 1u: { out.clip_position = a + d; }