Texture: Add defaults to textures.

[gero3]

A followup on #17550 (comment).

This adds defaults to DataTexture2DArray & DataTexture3D.

[EliasHasle]

Quoting the WebGL 2 specification:

void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView? srcData)

void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView srcData, GLuint srcOffset) (OpenGL ES 3.0.4 §3.8.4, man page)

Allocates and initializes the specified mipmap level of a three-dimensional or two-dimensional array texture.

If a WebGLBuffer is bound to the PIXEL_UNPACK_BUFFER target, generates an INVALID_OPERATION error.

If srcData is null, a buffer of sufficient size initialized to 0 is passed.

So this should be right, for the same reasons it was (should be) right with DataTexture.

Resolved

I am a bit scared by this line, though. I cannot (using GitHub search) find any place where `texture.image.complete` is set, for _any_ type of texture. Then I would guess it is done outside three.js, but that cannot be the case for `DataTexture`, right? Edit: Ah, it checks for `image.complete === false`, not for `! image.complete`. Then `image.complete === undefined` skips the block. OK! `image.complete` is presumably used, or at least intended for use, when using images before they are completely loaded (although I find no mentions in either `TextureLoader` or `ImageLoader`).

[Mugen87]

Merging this one for consistency and testing on dev.

[Mugen87]

Updated builds: cfdfcd7

[mrdoob]

Thanks!