TSL: UniformsNode support int/uint

[RenaudRohlinger]

Related issue: #27706

Description

const vectors = uniforms( [
	new THREE.Vector4( 1, 0, 1, 1 ),
	new THREE.Vector4( 0, 1, 0, 1 ),
	new THREE.Vector4( 0, 0, 1, 1 )
], 'ivec4' );

Allow to specify the bufferType to uniforms. Without it, the struct in the WGSL backend was always generating float vec4 which would then break some operation when using layouts.

This contribution is funded by Utsubo

[sunag]

What do you think about using builder.getComponentType() in setup and define bufferType there, so we could have a single parameter for type.

const vectors = uniforms( [
	new THREE.Vector4( 1, 0, 1, 1 ),
	new THREE.Vector4( 0, 1, 0, 1 ),
	new THREE.Vector4( 0, 0, 1, 1 )
], 'ivec4' );

[RenaudRohlinger]

Then since the best practice is to use vec4 with UBOs I guess I will need to do something like so:

const type = ...toLowerCase().charAt( 0 );

let _type = 'vec4';
if ( type === 'u' ) {

_type = 'uvec4';

} else if ( type === 'i' ) {

_type = 'ivec4';

}

[sunag]

@RenaudRohlinger I imagined something like your example too 👍

I haven't tested this one maybe this work?
this.bufferType = builder.changeComponentType( 'vec4', builder.getComponentType( this.elementType ) )