Hi Team,
I’ve had a recurring issue when trying to write shaders in webgpu, in that uniforms never seem to have any data in them (or are misaligned). This seems particularly obvious when attempting to pass an array of values. Everything compiles, but even the simplest data i.e. if (0.0 > myUniform). where my Uniform is hardcoded to some large value. Doesn’t work. Hardcoding the values in the shader works as expected so its not the shader itself.
Heres some code similar to how I’m setting it:
const positions = new Float32Array(maxNumber * 3);
const blendRadii = new Float32Array(maxNumber);
const indices = new Float32Array(maxNumber);
manager.getList().forEach((p, idx) => {
positions.set(p.worldPosition, idx * 3);
blendRadii[idx] = 5;
indicies[idx] = idx;
});
app.root.findComponents('render').forEach((r) =>
r.meshInstances.forEach((m: MeshInstance) => {
const mat = m.material;
mat.setParameter('pCount', textures.length);
mat.setParameter('positions', positions);
mat.setParameter('blendRadii', blendRadii);
mat.setParameter('indices', indices);
mat.update();
})
);
And the uniforms in the shader:
uniform pCount: u32;
uniform positions: array<vec3f, 4>;
uniform blendRadii: array<f32, 4>;
uniform indicies: array<f32, 4>;
This is almost certainly the same issue that blocked me when doing my other rnd work on volumetrics on webgpu (even though it works in webgl, I couldn’t for the life of me get the webgpu version working)
What am I doing wrong?
