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