1#import bevy_pbr::{
2    pbr_fragment::pbr_input_from_standard_material,
3    pbr_functions::alpha_discard,
4}
5
6#ifdef PREPASS_PIPELINE
7#import bevy_pbr::{
8    prepass_io::{VertexOutput, FragmentOutput},
9    pbr_deferred_functions::deferred_output,
10}
11#else
12#import bevy_pbr::{
13    forward_io::{VertexOutput, FragmentOutput},
14    pbr_functions::{apply_pbr_lighting, main_pass_post_lighting_processing},
15}
16#endif
17
18struct MyExtendedMaterial {
19    quantize_steps: u32,
20#ifdef SIXTEEN_BYTE_ALIGNMENT
21    // Web examples WebGL2 support: structs must be 16 byte aligned.
22    _webgl2_padding_8b: u32,
23    _webgl2_padding_12b: u32,
24    _webgl2_padding_16b: u32,
25#endif
26}
27
28@group(2) @binding(100)
29var<uniform> my_extended_material: MyExtendedMaterial;
30
31@fragment
32fn fragment(
33    in: VertexOutput,
34    @builtin(front_facing) is_front: bool,
35) -> FragmentOutput {
36    // generate a PbrInput struct from the StandardMaterial bindings
37    var pbr_input = pbr_input_from_standard_material(in, is_front);
38
39    // we can optionally modify the input before lighting and alpha_discard is applied
40    pbr_input.material.base_color.b = pbr_input.material.base_color.r;
41
42    // alpha discard
43    pbr_input.material.base_color = alpha_discard(pbr_input.material, pbr_input.material.base_color);
44
45#ifdef PREPASS_PIPELINE
46    // in deferred mode we can't modify anything after that, as lighting is run in a separate fullscreen shader.
47    let out = deferred_output(in, pbr_input);
48#else
49    var out: FragmentOutput;
50    // apply lighting
51    out.color = apply_pbr_lighting(pbr_input);
52
53    // we can optionally modify the lit color before post-processing is applied
54    out.color = vec4<f32>(vec4<u32>(out.color * f32(my_extended_material.quantize_steps))) / f32(my_extended_material.quantize_steps);
55
56    // apply in-shader post processing (fog, alpha-premultiply, and also tonemapping, debanding if the camera is non-hdr)
57    // note this does not include fullscreen postprocessing effects like bloom.
58    out.color = main_pass_post_lighting_processing(pbr_input, out.color);
59
60    // we can optionally modify the final result here
61    out.color = out.color * 2.0;
62#endif
63
64    return out;
65}