35826be6f7
This commit allows Bevy to bind 16 lightmaps at a time, if the current platform supports bindless textures. Naturally, if bindless textures aren't supported, Bevy falls back to binding only a single lightmap at a time. As lightmaps are usually heavily atlased, I doubt many scenes will use more than 16 lightmap textures. This has little performance impact now, but it's desirable for us to reap the benefits of multidraw and bindless textures on scenes that use lightmaps. Otherwise, we might have to break batches in order to switch those lightmaps. Additionally, this PR slightly reduces the cost of binning because it makes the lightmap index in `Opaque3dBinKey` 32 bits instead of an `AssetId`. ## Migration Guide * The `Opaque3dBinKey::lightmap_image` field is now `Opaque3dBinKey::lightmap_slab`, which is a lightweight identifier for an entire binding array of lightmaps.
39 lines
1.2 KiB
WebGPU Shading Language
39 lines
1.2 KiB
WebGPU Shading Language
#import bevy_pbr::forward_io::VertexOutput
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#import bevy_pbr::mesh_bindings::mesh
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struct Color {
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base_color: vec4<f32>,
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}
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#ifdef BINDLESS
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@group(2) @binding(0) var<storage> material_color: binding_array<Color, 4>;
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@group(2) @binding(1) var material_color_texture: binding_array<texture_2d<f32>, 4>;
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@group(2) @binding(2) var material_color_sampler: binding_array<sampler, 4>;
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#else // BINDLESS
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@group(2) @binding(0) var<uniform> material_color: Color;
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@group(2) @binding(1) var material_color_texture: texture_2d<f32>;
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@group(2) @binding(2) var material_color_sampler: sampler;
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#endif // BINDLESS
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@fragment
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fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
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#ifdef BINDLESS
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let slot = mesh[in.instance_index].material_and_lightmap_bind_group_slot & 0xffffu;
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let base_color = material_color[slot].base_color;
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#else // BINDLESS
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let base_color = material_color.base_color;
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#endif // BINDLESS
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return base_color * textureSampleLevel(
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#ifdef BINDLESS
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material_color_texture[slot],
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material_color_sampler[slot],
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#else // BINDLESS
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material_color_texture,
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material_color_sampler,
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#endif // BINDLESS
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in.uv,
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0.0
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);
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}
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