1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
struct InstanceInput {
@location(0) position: vec3<f32>,
@location(1) origin: vec3<f32>,
@location(2) radius: f32
};
struct VertexOutput {
@builtin(position) clip_position: vec4<f32>,
@location(0) local_position: vec3<f32>,
};
struct CameraUniform {
view: mat4x4<f32>,
proj: mat4x4<f32>,
abs_pos: vec3<f32>,
rel_pos: vec3<f32>,
scale: f32,
};
@group(0) @binding(0)
var<uniform> camera: CameraUniform;
const QUAD_VERTICES = array<vec3<f32>,6>(
vec3<f32>(-1.0, -1.0, 0.0),
vec3<f32>(-1.0, 1.0 , 0.0),
vec3<f32>(1.0, 1.0 , 0.0),
vec3<f32>(1.0, 1.0 , 0.0),
vec3<f32>(1.0, -1.0, 0.0),
vec3<f32>(-1.0, -1.0, 0.0),
);
@vertex
fn vs_main(
@builtin(vertex_index) index: u32,
instance: InstanceInput
) -> VertexOutput {
var out: VertexOutput;
let model = QUAD_VERTICES[index];
var view = camera.view;
out.local_position = model;
let min_size = 0.025;
let real_radius = max(min_size / 2.0, instance.radius * camera.scale);
//Scale the world around the camera scale and translate about the camera's
//absolute (/target) position
let relative_pos = instance.position;
let origin_pos = instance.origin - camera.abs_pos - camera.rel_pos;
let view_proj = camera.proj * view;
let origin_vp_pos = view_proj * vec4<f32>(origin_pos * camera.scale, 1.0);
let offset_vp = view_proj * vec4<f32>(relative_pos * camera.scale, 0.0);
let center_vp_pos = origin_vp_pos + offset_vp;
let offset_ndc = offset_vp.xy / origin_vp_pos.w;
if (length(offset_ndc) < 2.0 * min_size){
if all(offset_vp != vec4<f32>(0.0)) {
out.clip_position = vec4<f32>(0.0, 0.0, 0.0, 1.0);
return out;
}
}
let model_proj = camera.proj * vec4<f32>(model.xy, 0.0, 0.0);
let vertex_vp_pos = center_vp_pos + vec4<f32>(model_proj.xy * instance.radius * camera.scale, 0.0, 0.0);
let vertex_dist = length(vertex_vp_pos - center_vp_pos) / center_vp_pos.w;
if vertex_dist < min_size {
out.clip_position = center_vp_pos / center_vp_pos.w;
out.clip_position += model_proj * (min_size / 2.0);
}else{
out.clip_position = vertex_vp_pos;
}
return out;
}
@fragment
fn fs_main(in: VertexOutput
) -> @location(0) vec4<f32> {
let point_dist = length(in.local_position);
var alpha = 1.0;
if point_dist > 1.0 {
alpha = 0.0;
}
let color = vec3<f32>(1.0);
return vec4<f32>(color, alpha);
}
|
