1#import bevy_pbr::{
2    forward_io::VertexOutput,
3    mesh_view_bindings::view,
4    pbr_types::{STANDARD_MATERIAL_FLAGS_DOUBLE_SIDED_BIT, PbrInput, pbr_input_new},
5    pbr_functions as fns,
6    pbr_bindings,
7}
8#import bevy_core_pipeline::tonemapping::tone_mapping
9
10@group(#{MATERIAL_BIND_GROUP}) @binding(0) var my_array_texture: texture_2d_array<f32>;
11@group(#{MATERIAL_BIND_GROUP}) @binding(1) var my_array_texture_sampler: sampler;
12
13@fragment
14fn fragment(
15    @builtin(front_facing) is_front: bool,
16    mesh: VertexOutput,
17) -> @location(0) vec4<f32> {
18    let layer = i32(mesh.world_position.x) & 0x3;
19
20    // Prepare a 'processed' StandardMaterial by sampling all textures to resolve
21    // the material members
22    var pbr_input: PbrInput = pbr_input_new();
23
24    pbr_input.material.base_color = textureSample(my_array_texture, my_array_texture_sampler, mesh.uv, layer);
25#ifdef VERTEX_COLORS
26    pbr_input.material.base_color = pbr_input.material.base_color * mesh.color;
27#endif
28
29    let double_sided = (pbr_input.material.flags & STANDARD_MATERIAL_FLAGS_DOUBLE_SIDED_BIT) != 0u;
30
31    pbr_input.frag_coord = mesh.position;
32    pbr_input.world_position = mesh.world_position;
33    pbr_input.world_normal = fns::prepare_world_normal(
34        mesh.world_normal,
35        double_sided,
36        is_front,
37    );
38
39    pbr_input.is_orthographic = view.clip_from_view[3].w == 1.0;
40
41    pbr_input.N = normalize(pbr_input.world_normal);
42
43#ifdef VERTEX_TANGENTS
44    let Nt = textureSampleBias(pbr_bindings::normal_map_texture, pbr_bindings::normal_map_sampler, mesh.uv, view.mip_bias).rgb;
45    let TBN = fns::calculate_tbn_mikktspace(mesh.world_normal, mesh.world_tangent);
46    pbr_input.N = fns::apply_normal_mapping(
47        pbr_input.material.flags,
48        TBN,
49        double_sided,
50        is_front,
51        Nt,
52    );
53#endif
54
55    pbr_input.V = fns::calculate_view(mesh.world_position, pbr_input.is_orthographic);
56
57    return tone_mapping(fns::apply_pbr_lighting(pbr_input), view.color_grading);
58}