1#define_import_path bevy_pbr::mesh_view_types
2
3struct ClusterableObject {
4    // For point lights: the lower-right 2x2 values of the projection matrix [2][2] [2][3] [3][2] [3][3]
5    // For spot lights: the direction (x,z), spot_scale and spot_offset
6    light_custom_data: vec4<f32>,
7    color_inverse_square_range: vec4<f32>,
8    position_radius: vec4<f32>,
9    // 'flags' is a bit field indicating various options. u32 is 32 bits so we have up to 32 options.
10    flags: u32,
11    shadow_depth_bias: f32,
12    shadow_normal_bias: f32,
13    spot_light_tan_angle: f32,
14    soft_shadow_size: f32,
15    shadow_map_near_z: f32,
16    texture_index: u32,
17    pad: f32,
18};
19
20const POINT_LIGHT_FLAGS_SHADOWS_ENABLED_BIT: u32                    = 1u;
21const POINT_LIGHT_FLAGS_SPOT_LIGHT_Y_NEGATIVE: u32                  = 2u;
22const POINT_LIGHT_FLAGS_VOLUMETRIC_BIT: u32                         = 4u;
23const POINT_LIGHT_FLAGS_AFFECTS_LIGHTMAPPED_MESH_DIFFUSE_BIT: u32   = 8u;
24
25struct DirectionalCascade {
26    clip_from_world: mat4x4<f32>,
27    texel_size: f32,
28    far_bound: f32,
29}
30
31struct DirectionalLight {
32    cascades: array<DirectionalCascade, #{MAX_CASCADES_PER_LIGHT}>,
33    color: vec4<f32>,
34    direction_to_light: vec3<f32>,
35    // 'flags' is a bit field indicating various options. u32 is 32 bits so we have up to 32 options.
36    flags: u32,
37    soft_shadow_size: f32,
38    shadow_depth_bias: f32,
39    shadow_normal_bias: f32,
40    num_cascades: u32,
41    cascades_overlap_proportion: f32,
42    depth_texture_base_index: u32,
43};
44
45const DIRECTIONAL_LIGHT_FLAGS_SHADOWS_ENABLED_BIT: u32                  = 1u;
46const DIRECTIONAL_LIGHT_FLAGS_VOLUMETRIC_BIT: u32                       = 2u;
47const DIRECTIONAL_LIGHT_FLAGS_AFFECTS_LIGHTMAPPED_MESH_DIFFUSE_BIT: u32 = 4u;
48
49struct Lights {
50    // NOTE: this array size must be kept in sync with the constants defined in bevy_pbr/src/render/light.rs
51    directional_lights: array<DirectionalLight, #{MAX_DIRECTIONAL_LIGHTS}u>,
52    ambient_color: vec4<f32>,
53    // x/y/z dimensions and n_clusters in w
54    cluster_dimensions: vec4<u32>,
55    // xy are vec2<f32>(cluster_dimensions.xy) / vec2<f32>(view.width, view.height)
56    //
57    // For perspective projections:
58    // z is cluster_dimensions.z / log(far / near)
59    // w is cluster_dimensions.z * log(near) / log(far / near)
60    //
61    // For orthographic projections:
62    // NOTE: near and far are +ve but -z is infront of the camera
63    // z is -near
64    // w is cluster_dimensions.z / (-far - -near)
65    cluster_factors: vec4<f32>,
66    n_directional_lights: u32,
67    spot_light_shadowmap_offset: i32,
68    environment_map_smallest_specular_mip_level: u32,
69    environment_map_intensity: f32,
70};
71
72struct Fog {
73    base_color: vec4<f32>,
74    directional_light_color: vec4<f32>,
75    // `be` and `bi` are allocated differently depending on the fog mode
76    //
77    // For Linear Fog:
78    //     be.x = start, be.y = end
79    // For Exponential and ExponentialSquared Fog:
80    //     be.x = density
81    // For Atmospheric Fog:
82    //     be = per-channel extinction density
83    //     bi = per-channel inscattering density
84    be: vec3<f32>,
85    directional_light_exponent: f32,
86    bi: vec3<f32>,
87    mode: u32,
88}
89
90// Important: These must be kept in sync with `fog.rs`
91const FOG_MODE_OFF: u32                   = 0u;
92const FOG_MODE_LINEAR: u32                = 1u;
93const FOG_MODE_EXPONENTIAL: u32           = 2u;
94const FOG_MODE_EXPONENTIAL_SQUARED: u32   = 3u;
95const FOG_MODE_ATMOSPHERIC: u32           = 4u;
96
97#if AVAILABLE_STORAGE_BUFFER_BINDINGS >= 3
98struct ClusterableObjects {
99    data: array<ClusterableObject>,
100};
101struct ClusterLightIndexLists {
102    data: array<u32>,
103};
104struct ClusterOffsetsAndCounts {
105    data: array<array<vec4<u32>, 2>>,
106};
107#else
108struct ClusterableObjects {
109    data: array<ClusterableObject, 204u>,
110};
111struct ClusterLightIndexLists {
112    // each u32 contains 4 u8 indices into the ClusterableObjects array
113    data: array<vec4<u32>, 1024u>,
114};
115struct ClusterOffsetsAndCounts {
116    // each u32 contains a 24-bit index into ClusterLightIndexLists in the high 24 bits
117    // and an 8-bit count of the number of lights in the low 8 bits
118    data: array<vec4<u32>, 1024u>,
119};
120#endif
121
122struct LightProbe {
123    // This is stored as the transpose in order to save space in this structure.
124    // It'll be transposed in the `environment_map_light` function.
125    light_from_world_transposed: mat3x4<f32>,
126    cubemap_index: i32,
127    intensity: f32,
128    // Whether this light probe contributes diffuse light to lightmapped meshes.
129    affects_lightmapped_mesh_diffuse: u32,
130};
131
132struct LightProbes {
133    // This must match `MAX_VIEW_REFLECTION_PROBES` on the Rust side.
134    reflection_probes: array<LightProbe, 8u>,
135    irradiance_volumes: array<LightProbe, 8u>,
136    reflection_probe_count: i32,
137    irradiance_volume_count: i32,
138    // The index of the view environment map cubemap binding, or -1 if there's
139    // no such cubemap.
140    view_cubemap_index: i32,
141    // The smallest valid mipmap level for the specular environment cubemap
142    // associated with the view.
143    smallest_specular_mip_level_for_view: u32,
144    // The intensity of the environment map associated with the view.
145    intensity_for_view: f32,
146    // Whether the environment map attached to the view affects the diffuse
147    // lighting for lightmapped meshes.
148    view_environment_map_affects_lightmapped_mesh_diffuse: u32,
149};
150
151// Settings for screen space reflections.
152//
153// For more information on these settings, see the documentation for
154// `bevy_pbr::ssr::ScreenSpaceReflections`.
155struct ScreenSpaceReflectionsSettings {
156    perceptual_roughness_threshold: f32,
157    thickness: f32,
158    linear_steps: u32,
159    linear_march_exponent: f32,
160    bisection_steps: u32,
161    use_secant: u32,
162};
163
164struct EnvironmentMapUniform {
165    // Transformation matrix for the environment cubemaps in world space.
166    transform: mat4x4<f32>,
167};
168
169// Shader version of the order independent transparency settings component.
170struct OrderIndependentTransparencySettings {
171  layers_count: i32,
172  alpha_threshold: f32,
173};
174
175struct ClusteredDecal {
176    local_from_world: mat4x4<f32>,
177    image_index: i32,
178    tag: u32,
179    pad_a: u32,
180    pad_b: u32,
181}
182
183struct ClusteredDecals {
184    decals: array<ClusteredDecal>,
185}