bevy/assets/shaders/custom_material_2d.wgsl

#import bevy_sprite::mesh2d_vertex_output::VertexOutput
// we can import items from shader modules in the assets folder with a quoted path
#import "shaders/custom_material_import.wgsl"::COLOR_MULTIPLIER

@group(2) @binding(0) var<uniform> material_color: vec4<f32>;
@group(2) @binding(1) var base_color_texture: texture_2d<f32>;
@group(2) @binding(2) var base_color_sampler: sampler;

@fragment
fn fragment(mesh: VertexOutput) -> @location(0) vec4<f32> {
    return material_color * textureSample(base_color_texture, base_color_sampler, mesh.uv) * COLOR_MULTIPLIER;
}