The chromium_experimental_resource_table is an experimental extension that provides different prototype options to support the WebGPU bindless prototypes.
This extension is experimental and the syntax is being discussed. No official WebGPU specification has been written yet.
| Platform | Notes | | SPIR-V | Requires SPV_EXT_descriptor_indexing extension and RuntimeDescriptorArray capability | | HLSL | Supported for DXC, not FXC | | MSL | Supported (TODO determine if there are Metal version restrictions) | | GLSL | Not supported |
Due to limited availability, this will need an enable statement to be used. For this experimental extension it would be enable chromium_experimental_resource_table.
The concept of a Resource Table is added to WGSL. This is not a type which can be written, or an address space, but a data table available to use with the getResource and hasResource methods. The table is made available by the system and is just accessible.
hasResource@must_use fn hasResource<T>(index: I) -> bool
I is an i32 or u32T is a format-less storage texture (e.g. texture_storage_2d<f32>), sampled texture, multisampled texture, or depth texture.hasResource returns true if the item a index of the resource table is of type T.
getResource@must_use fn getResource<T>(index: I) -> T
I is an i32 or u32T is a format-less storage texture (e.g. texture_storage_2d<f32>), sampled texture, multisampled texture, or depth texture.getResource returns the value in the resource table at index of type T.
If index is outside the bounds of the resource table then a default value of type T will be returned. If the item at index is not of type T then a default value of type T is returned. Essentially, a value is always returned, it may just be a synthensized default value.
enable chromium_experimental_resource_table;
const kHouseTexture = 0u;
@fragment fn fs() {
if (hasResource<texture_2d<f32>>(kHouseTexture)) {
let tex = textureLoad(getResource<texture_2d<f32>>(kHouseTexture));
}
}