e6ba9a6d18
# Objective Closes #18075 In order to enable a number of patterns for dynamic materials in the engine, it's necessary to decouple the renderer from the `Material` trait. This opens the possibility for: - Materials that aren't coupled to `AsBindGroup`. - 2d using the underlying 3d bindless infrastructure. - Dynamic materials that can change their layout at runtime. - Materials that aren't even backed by a Rust struct at all. ## Solution In short, remove all trait bounds from render world material systems and resources. This means moving a bunch of stuff onto `MaterialProperties` and engaging in some hacks to make specialization work. Rather than storing the bind group data in `MaterialBindGroupAllocator`, right now we're storing it in a closure on `MaterialProperties`. TBD if this has bad performance characteristics. ## Benchmarks - `many_cubes`: `cargo run --example many_cubes --release --features=bevy/trace_tracy -- --vary-material-data-per-instance`:  - @DGriffin91's Caldera `cargo run --release --features=bevy/trace_tracy -- --random-materials`  - @DGriffin91's Caldera with 20 unique material types (i.e. `MaterialPlugin<M>`) and random materials per mesh `cargo run --release --features=bevy/trace_tracy -- --random-materials`  ### TODO - We almost certainly lost some parallelization from removing the type params that could be gained back from smarter iteration. - Test all the things that could have broken. - ~Fix meshlets~ ## Showcase See [the example](https://github.com/bevyengine/bevy/pull/19667/files#diff-9d768cfe1c3aa81eff365d250d3cbe5a63e8df63e81dd85f64c3c3cd993f6d94) for a custom material implemented without the use of the `Material` trait and thus `AsBindGroup`.  --------- Co-authored-by: IceSentry <IceSentry@users.noreply.github.com> Co-authored-by: IceSentry <c.giguere42@gmail.com>
12 lines
333 B
WebGPU Shading Language
12 lines
333 B
WebGPU Shading Language
#import bevy_pbr::forward_io::VertexOutput
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@group(3) @binding(0) var material_color_texture: texture_2d<f32>;
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@group(3) @binding(1) var material_color_sampler: sampler;
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@fragment
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fn fragment(
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mesh: VertexOutput,
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) -> @location(0) vec4<f32> {
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return textureSample(material_color_texture, material_color_sampler, mesh.uv);
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}
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