WebGLTextures: Improve RED_INTEGER texture support.

[RenaudRohlinger]

This pull request enhances the THREE.WebGLTextures class in three.js to support the use of integer textures in WebGL2. Specifically, it adds conditional handling for the glFormat value of RED_INTEGER, assigning the appropriate internalFormat based on the given glType.

With this enhancement, WebGLTextures now correctly assigns the internalFormat for BYTE, SHORT, INT, UNSIGNED_BYTE, UNSIGNED_SHORT, and UNSIGNED_INT texture types when using the RED_INTEGER format.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
643.8 kB (159.6 kB)	644 kB (159.7 kB)	+187 B

🌳 Bundle size after tree-shaking

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

Filesize dev	Filesize PR	Diff
437 kB (105.8 kB)	437.2 kB (105.8 kB)	+187 B