WebGPURenderer: error with empty compressed textures

[vlucendo]

Description

It is very common to assign an empty texture to a uniform while the asset loads, and then copy the loaded data to it once it's available. On WebGPU renderer this throws an error due to the lack of mipmaps.

Reproduction steps

1. Assign an empty compressed texture to a uniform
2. Render something with a shader using that uniform

Code

const testLoader = new KTX2Loader();
testLoader.detectSupport(webgpurenderer);
testLoader.setTranscoderPath(`libs/basis/`);

const cTexture = new CompressedTexture();
const textureNode = texture(cTexture);

testLoader.loadAsync('url_of_new_texture.ktx2').then((newTexture) => {
    cTexture.copy(newTexture);
    cTexture.needsUpdate = true;
});

 const fs = wgslFn(/* wgsl */ `
  fn test(
      vUv: vec2f,
      tex: texture_2d<f32>,
      tex_sampler: sampler
  ) -> vec4<f32> {
      var lala = textureSample(tex, tex_sampler, vUv);
      return vec4f(lala.rgb, 1.0);
  }
`);

this.material.fragmentNode = fs({
    vUv: varyingvUv,
    tex: textureNode,
    tex_sampler: textureNode,
});

// ... etc

Live example

• jsfiddle

Screenshots

No response

Version

r170

Device

No response

Browser

No response

OS

No response

[Mugen87]

I think this has been overlooked since we have only tested compressed textures with KTX2Loader so far. We then use loadAsync() which makes sure the compressed texture is ready on the first usage.