GLSLNodeBuilder: Fix texelFetch lod type.

[Mugen87]

Fixed #33394.

Description

The PR makes sure the lod parameter for the texelFetch() call is of type int.

We could also make the change below and change float to int.

three.js/src/nodes/accessors/TextureNode.js

Line 548 in dc547c7

const levelSnippet = levelNode ? levelNode.build( builder, 'float' ) : null;

However, textureSampleLevel() and textureLod() required their lod parameter as a float. So we need at least one type cast.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	361.4 85.82	361.4 85.82	+0 B +0 B
WebGPU	637.46 177.05	637.49 177.06	+28 B +10 B
WebGPU Nodes	635.58 176.76	635.61 176.77	+28 B +9 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	493.91 120.5	493.91 120.5	+0 B +0 B
WebGPU	709.22 191.87	709.24 191.88	+28 B +9 B
WebGPU Nodes	658.43 179.17	658.46 179.18	+28 B +9 B