1#define_import_path bevy_pbr::mesh_functions
2
3fn mesh_position_local_to_world(model: mat4x4<f32>, vertex_position: vec4<f32>) -> vec4<f32> {
4    return model * vertex_position;
5}
6
7fn mesh_position_world_to_clip(world_position: vec4<f32>) -> vec4<f32> {
8    return view.view_proj * world_position;
9}
10
11// NOTE: The intermediate world_position assignment is important
12// for precision purposes when using the 'equals' depth comparison
13// function.
14fn mesh_position_local_to_clip(model: mat4x4<f32>, vertex_position: vec4<f32>) -> vec4<f32> {
15    let world_position = mesh_position_local_to_world(model, vertex_position);
16    return mesh_position_world_to_clip(world_position);
17}
18
19fn mesh_normal_local_to_world(vertex_normal: vec3<f32>) -> vec3<f32> {
20    return mat3x3<f32>(
21        mesh.inverse_transpose_model[0].xyz,
22        mesh.inverse_transpose_model[1].xyz,
23        mesh.inverse_transpose_model[2].xyz
24    ) * vertex_normal;
25}
26
27fn mesh_tangent_local_to_world(model: mat4x4<f32>, vertex_tangent: vec4<f32>) -> vec4<f32> {
28    return vec4<f32>(
29        mat3x3<f32>(
30            model[0].xyz,
31            model[1].xyz,
32            model[2].xyz
33        ) * vertex_tangent.xyz,
34        vertex_tangent.w
35    );
36}