1#import bevy_pbr::{
2    mesh_bindings::mesh,
3    mesh_functions,
4    skinning,
5    morph::morph,
6    forward_io::{Vertex, VertexOutput},
7    view_transformations::position_world_to_clip,
8}
9
10#ifdef MORPH_TARGETS
11fn morph_vertex(vertex_in: Vertex) -> Vertex {
12    var vertex = vertex_in;
13    let first_vertex = mesh[vertex.instance_index].first_vertex_index;
14    let vertex_index = vertex.index - first_vertex;
15
16    let weight_count = bevy_pbr::morph::layer_count();
17    for (var i: u32 = 0u; i < weight_count; i ++) {
18        let weight = bevy_pbr::morph::weight_at(i);
19        if weight == 0.0 {
20            continue;
21        }
22        vertex.position += weight * morph(vertex_index, bevy_pbr::morph::position_offset, i);
23#ifdef VERTEX_NORMALS
24        vertex.normal += weight * morph(vertex_index, bevy_pbr::morph::normal_offset, i);
25#endif
26#ifdef VERTEX_TANGENTS
27        vertex.tangent += vec4(weight * morph(vertex_index, bevy_pbr::morph::tangent_offset, i), 0.0);
28#endif
29    }
30    return vertex;
31}
32#endif
33
34@vertex
35fn vertex(vertex_no_morph: Vertex) -> VertexOutput {
36    var out: VertexOutput;
37
38#ifdef MORPH_TARGETS
39    var vertex = morph_vertex(vertex_no_morph);
40#else
41    var vertex = vertex_no_morph;
42#endif
43
44#ifdef SKINNED
45    var world_from_local = skinning::skin_model(vertex.joint_indices, vertex.joint_weights);
46#else
47    // Use vertex_no_morph.instance_index instead of vertex.instance_index to work around a wgpu dx12 bug.
48    // See https://github.com/gfx-rs/naga/issues/2416 .
49    var world_from_local = mesh_functions::get_world_from_local(vertex_no_morph.instance_index);
50#endif
51
52#ifdef VERTEX_NORMALS
53#ifdef SKINNED
54    out.world_normal = skinning::skin_normals(world_from_local, vertex.normal);
55#else
56    out.world_normal = mesh_functions::mesh_normal_local_to_world(
57        vertex.normal,
58        // Use vertex_no_morph.instance_index instead of vertex.instance_index to work around a wgpu dx12 bug.
59        // See https://github.com/gfx-rs/naga/issues/2416
60        vertex_no_morph.instance_index
61    );
62#endif
63#endif
64
65#ifdef VERTEX_POSITIONS
66    out.world_position = mesh_functions::mesh_position_local_to_world(world_from_local, vec4<f32>(vertex.position, 1.0));
67    out.position = position_world_to_clip(out.world_position.xyz);
68#endif
69
70#ifdef VERTEX_UVS_A
71    out.uv = vertex.uv;
72#endif
73#ifdef VERTEX_UVS_B
74    out.uv_b = vertex.uv_b;
75#endif
76
77#ifdef VERTEX_TANGENTS
78    out.world_tangent = mesh_functions::mesh_tangent_local_to_world(
79        world_from_local,
80        vertex.tangent,
81        // Use vertex_no_morph.instance_index instead of vertex.instance_index to work around a wgpu dx12 bug.
82        // See https://github.com/gfx-rs/naga/issues/2416
83        vertex_no_morph.instance_index
84    );
85#endif
86
87#ifdef VERTEX_COLORS
88    out.color = vertex.color;
89#endif
90
91#ifdef VERTEX_OUTPUT_INSTANCE_INDEX
92    // Use vertex_no_morph.instance_index instead of vertex.instance_index to work around a wgpu dx12 bug.
93    // See https://github.com/gfx-rs/naga/issues/2416
94    out.instance_index = vertex_no_morph.instance_index;
95#endif
96
97#ifdef VISIBILITY_RANGE_DITHER
98    out.visibility_range_dither = mesh_functions::get_visibility_range_dither_level(
99        vertex_no_morph.instance_index, world_from_local[3]);
100#endif
101
102    return out;
103}
104
105@fragment
106fn fragment(
107    mesh: VertexOutput,
108) -> @location(0) vec4<f32> {
109#ifdef VERTEX_COLORS
110    return mesh.color;
111#else
112    return vec4<f32>(1.0, 0.0, 1.0, 1.0);
113#endif
114}