84991d34f3
# Objective - Make the reusable PBR shading functionality a little more reusable - Add constructor functions for `StandardMaterial` and `PbrInput` structs to populate them with default values - Document unclear `PbrInput` members - Demonstrate how to reuse the bevy PBR shading functionality - The final important piece from #3969 as the initial shot at making the PBR shader code reusable in custom materials ## Solution - Add back and rework the 'old' `array_texture` example from pre-0.6. - Create a custom shader material - Use a single array texture binding and sampler for the material bind group - Use a shader that calls `pbr()` from the `bevy_pbr::pbr_functions` import - Spawn a row of cubes using the custom material - In the shader, select the array texture layer to sample by using the world position x coordinate modulo the number of array texture layers <img width="1392" alt="Screenshot 2022-06-23 at 12 28 05" src="https://user-images.githubusercontent.com/302146/175278593-2296f519-f577-4ece-81c0-d842283784a1.png"> Co-authored-by: Carter Anderson <mcanders1@gmail.com>
64 lines
1.8 KiB
WebGPU Shading Language
64 lines
1.8 KiB
WebGPU Shading Language
#import bevy_pbr::mesh_view_bindings
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#import bevy_pbr::mesh_bindings
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#import bevy_pbr::pbr_types
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#import bevy_pbr::utils
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#import bevy_pbr::clustered_forward
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#import bevy_pbr::lighting
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#import bevy_pbr::shadows
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#import bevy_pbr::pbr_functions
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[[group(1), binding(0)]]
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var my_array_texture: texture_2d_array<f32>;
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[[group(1), binding(1)]]
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var my_array_texture_sampler: sampler;
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struct FragmentInput {
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[[builtin(front_facing)]] is_front: bool;
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[[builtin(position)]] frag_coord: vec4<f32>;
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[[location(0)]] world_position: vec4<f32>;
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[[location(1)]] world_normal: vec3<f32>;
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[[location(2)]] uv: vec2<f32>;
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#ifdef VERTEX_TANGENTS
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[[location(3)]] world_tangent: vec4<f32>;
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#endif
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#ifdef VERTEX_COLORS
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[[location(4)]] color: vec4<f32>;
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#endif
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};
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[[stage(fragment)]]
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fn fragment(in: FragmentInput) -> [[location(0)]] vec4<f32> {
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let layer = i32(in.world_position.x) & 0x3;
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// Prepare a 'processed' StandardMaterial by sampling all textures to resolve
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// the material members
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var pbr_input: PbrInput = pbr_input_new();
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pbr_input.material.base_color = textureSample(my_array_texture, my_array_texture_sampler, in.uv, layer);
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#ifdef VERTEX_COLORS
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pbr_input.material.base_color = pbr_input.material.base_color * in.color;
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#endif
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pbr_input.frag_coord = in.frag_coord;
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pbr_input.world_position = in.world_position;
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pbr_input.world_normal = in.world_normal;
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pbr_input.is_orthographic = view.projection[3].w == 1.0;
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pbr_input.N = prepare_normal(
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pbr_input.material.flags,
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in.world_normal,
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#ifdef VERTEX_TANGENTS
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#ifdef STANDARDMATERIAL_NORMAL_MAP
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in.world_tangent,
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#endif
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#endif
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in.uv,
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in.is_front,
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);
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pbr_input.V = calculate_view(in.world_position, pbr_input.is_orthographic);
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return pbr(pbr_input);
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}
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