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Packages › bevy_pbr › pbr_functions.wgsl

Constants

DITHER_THRESHOLD_MAP

#
Used by 8 shaders
const DITHER_THRESHOLD_MAP: vec4<u32> = vec4( 0x0a020800, 0x060e040c, 0x09010b03, 0x050d070f )

Structures

SampleBias

#
Used by 8 shaders

Biasing info needed to sample from a texture when calling sample_texture. How this is done depends on whether we’re rendering meshlets or regular meshes.

struct SampleBias {
ddx_uv: vec2<f32>, MESHLET_MESH_MATERIAL_PASS
ddy_uv: vec2<f32>, MESHLET_MESH_MATERIAL_PASS
mip_bias: f32, !MESHLET_MESH_MATERIAL_PASS
}

Functions

visibility_range_dither

#
Used by 8 shaders
Active when
VISIBILITY_RANGE_DITHER
fn visibility_range_dither (
frag_coord: vec4<f32>,
dither: i32
)

alpha_discard

#
Used by 9 shaders
fn alpha_discard (
material: pbr_types,
output_color: vec4<f32>
) -> vec4<f32>

sample_texture

#
Used by 8 shaders

Samples a texture using the appropriate biasing metric for the type of mesh in use (mesh vs. meshlet).

fn sample_texture (
texture: texture_2d<f32>,
samp: sampler,
uv: vec2<f32>,
bias: SampleBias
) -> vec4<f32>

prepare_world_normal

#
Used by 8 shaders
fn prepare_world_normal (
world_normal: vec3<f32>,
double_sided: bool,
is_front: bool
) -> vec3<f32>

calculate_tbn_mikktspace

#
Used by 8 shaders
fn calculate_tbn_mikktspace (
world_normal: vec3<f32>,
world_tangent: vec4<f32>
) -> mat3x3<f32>

apply_normal_mapping

#
Used by 8 shaders
fn apply_normal_mapping (
standard_material_flags: u32,
TBN: mat3x3<f32>,
double_sided: bool,
is_front: bool,
in_Nt: vec3<f32>
) -> vec3<f32>

bend_normal_for_anisotropy

#
Used by 8 shaders
Active when
STANDARD_MATERIAL_ANISOTROPY

This follows the suggested implementation in the KHR_materials_anisotropy specification: https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_anisotropy/README.md#image-based-lighting

fn bend_normal_for_anisotropy (
lighting_input: ptr,
lighting: LightingInput
)

calculate_view

#
Used by 8 shaders

NOTE: Correctly calculates the view vector depending on whether the projection is orthographic or perspective.

fn calculate_view (
world_position: vec4<f32>,
is_orthographic: bool
) -> vec3<f32>

calculate_diffuse_color

#
Used by 8 shaders

Diffuse strength is inversely related to metallicity, specular and diffuse transmission

fn calculate_diffuse_color (
base_color: vec3<f32>,
metallic: f32,
specular_transmission: f32,
diffuse_transmission: f32
) -> vec3<f32>

calculate_F0

#
Used by 8 shaders

Remapping [0,1] reflectance to F0 See https://google.github.io/filament/Filament.html#materialsystem/parameterization/remapping

fn calculate_F0 (
base_color: vec3<f32>,
metallic: f32,
reflectance: f32
) -> vec3<f32>

apply_pbr_lighting

#
Used by 9 shaders
Active when
!PREPASS_FRAGMENT
fn apply_pbr_lighting (
in: pbr_types
) -> vec4<f32>

apply_fog

#
Used by 8 shaders
fn apply_fog (
fog_params: mesh_view_types,
input_color: vec4<f32>,
fragment_world_position: vec3<f32>,
view_world_position: vec3<f32>
) -> vec4<f32>

premultiply_alpha

#
Used by 8 shaders
Active when
PREMULTIPLY_ALPHA
fn premultiply_alpha (
standard_material_flags: u32,
color: vec4<f32>
) -> vec4<f32>

main_pass_post_lighting_processing

#
Used by 9 shaders

fog, alpha premultiply for non-hdr cameras, tonemapping and debanding

fn main_pass_post_lighting_processing (
pbr_input: pbr_types,
input_color: vec4<f32>
) -> vec4<f32>
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