1#define_import_path bevy_pbr::mesh_types
2
3struct Mesh {
4    // Affine 4x3 matrices transposed to 3x4
5    // Use bevy_render::maths::affine3_to_square to unpack
6    world_from_local: mat3x4<f32>,
7    previous_world_from_local: mat3x4<f32>,
8    // 3x3 matrix packed in mat2x4 and f32 as:
9    // [0].xyz, [1].x,
10    // [1].yz, [2].xy
11    // [2].z
12    // Use bevy_pbr::mesh_functions::mat2x4_f32_to_mat3x3_unpack to unpack
13    local_from_world_transpose_a: mat2x4<f32>,
14    local_from_world_transpose_b: f32,
15    // 'flags' is a bit field indicating various options. u32 is 32 bits so we have up to 32 options.
16    flags: u32,
17    lightmap_uv_rect: vec2<u32>,
18    // The index of the mesh's first vertex in the vertex buffer.
19    first_vertex_index: u32,
20    current_skin_index: u32,
21    // Low 16 bits: index of the material inside the bind group data.
22    // High 16 bits: index of the lightmap in the binding array.
23    material_and_lightmap_bind_group_slot: u32,
24    // User supplied index to identify the mesh instance
25    tag: u32,
26    morph_descriptor_index: u32,
27};
28
29#ifdef SKINNED
30struct SkinnedMesh {
31    data: array<mat4x4<f32>, 256u>,
32};
33#endif
34
35#ifdef MORPH_TARGETS
36
37struct MorphWeights {
38    weights: array<vec4<f32>, 64u>, // 64 = 256 / 4 (256 = MAX_MORPH_WEIGHTS)
39};
40
41// Describes a single mesh instance that uses morph targets.
42struct MorphDescriptor {
43    // The index of the first morph target weight in the `morph_weights` array.
44    current_weights_offset: u32,
45    // The index of the first morph target weight in the `prev_morph_weights`
46    // array.
47    prev_weights_offset: u32,
48    // The index of the first morph target for this mesh in the
49    // `MorphAttributes` array.
50    targets_offset: u32,
51    // The number of vertices in the mesh.
52    vertex_count: u32,
53    // The number of morph targets this mesh has.
54    weight_count: u32,
55};
56
57// Morph displacement for a single vertex.
58struct MorphAttributes {
59    // The position delta.
60    position: vec3<f32>,
61    // Padding, to ensure that each `vec3<f32>` is aligned to 16 bytes.
62    pad_a: f32,
63    // The normal delta.
64    normal: vec3<f32>,
65    // Padding, to ensure that each `vec3<f32>` is aligned to 16 bytes.
66    pad_b: f32,
67    // The tangent delta.
68    tangent: vec3<f32>,
69    // Padding, to ensure that each `vec3<f32>` is aligned to 16 bytes.
70    pad_c: f32,
71};
72
73#endif  // MORPH_TARGETS
74
75// [2^0, 2^16)
76const MESH_FLAGS_VISIBILITY_RANGE_INDEX_BITS: u32     = (1u << 16u) - 1u;
77const MESH_FLAGS_AABB_BASED_VISIBILITY_RANGE_BIT: u32 = 1u << 27u;
78const MESH_FLAGS_NO_FRUSTUM_CULLING_BIT: u32          = 1u << 28u;
79const MESH_FLAGS_SHADOW_RECEIVER_BIT: u32             = 1u << 29u;
80const MESH_FLAGS_TRANSMITTED_SHADOW_RECEIVER_BIT: u32 = 1u << 30u;
81// if the flag is set, the sign is positive, else it is negative
82const MESH_FLAGS_SIGN_DETERMINANT_MODEL_3X3_BIT: u32  = 1u << 31u;