[3.x] Add Anisotropic Filter option for TextureArrays

[TokisanGames]

• Adds an option to enable anisotropic filtering for TextureArrays at import or runtime.
• Fixes typo in Texture::_bind_methods.
• Sets TextureLayered default flags to the same as Texture defaults: Repeat, Filter, Mipmaps. (This also changes it for TextureArray [desired for HTerrain] and Texture3D, I'm not sure if that's ok)

Addresses point three in #50900.

I'm using TextureArrays in @Zylann 's hterrain. Here it's working as expected. The new FLAGS_DEFAULT on top and that plus anisotropic filtering on bottom. This is with an 8192x6144 (4x3x2k) texture array.

[clayjohn]

Sets TextureLayered default flags to the same as Texture defaults: Repeat, Filter, Mipmaps. (This also changes it for TextureArray [desired for HTerrain] and Texture3D, I'm not sure if that's ok)

We should look into setting a different default for Texture3D and for ArrayTexture. IMO the old default made more sense for Texture3D, but the new default makes more sense for ArrayTextures.

[TokisanGames]

I have created a second commit, not yet squashed, that separates the bound enums defaults, and the create function.

This bit of code produces the following output.

func _ready():
	var t3d = Texture3D.new()
	print("T3d new flags: %d" % [ t3d.flags ])
	t3d.create(100, 100, 2, Image.FORMAT_RGB8)
	print("T3d object flags: %d, T3d default: %d" % [ t3d.flags, Texture3D.FLAGS_DEFAULT])

	var ta = TextureArray.new()
	print("TA new flags: %d" % [ ta.flags ])
	ta.create(100, 100, 2, Image.FORMAT_RGB8)
	print("TA object flags: %d, TA default: %d" % [ ta.flags, TextureArray.FLAGS_DEFAULT]) 

	get_tree().quit()

T3d new flags: 4
T3d object flags: 4, T3d default: 4
TA new flags: 7
TA object flags: 7, TA default: 7

Is this what you want?

[clayjohn]

I'd prefer to not duplicate the Flags in both classes. Wouldn't it be enough for them to just use different default values? You could even consider adding a FLAGS_DEFAULT_TEXTURE_ARRAY and FLAGS_DEFAULT_TEXTURE_3D enums to TextureLayered.

[TokisanGames]

If I can have two enum defaults, that makes things much simpler so I don't have to work around the clunky auto-documentation and bindings systems, and since C++ doesn't allow overriding enums.

This squashed version now includes separate default enum entries.

func _ready():
	var t3d = Texture3D.new()
	print("T3d new flags: %d" % [ t3d.flags ])
	t3d.create(100, 100, 2, Image.FORMAT_RGB8)
	print("T3d object flags: %d, T3d default: %d" % [ t3d.flags, Texture3D.FLAGS_DEFAULT_TEXTURE_3D])

	var ta = TextureArray.new()
	print("TA new flags: %d" % [ ta.flags ])
	ta.create(100, 100, 2, Image.FORMAT_RGB8)
	print("TA object flags: %d, TA default: %d" % [ ta.flags, TextureArray.FLAGS_DEFAULT_TEXTURE_ARRAY])

T3d new flags: 4
T3d object flags: 4, T3d default: 4
TA new flags: 7
TA object flags: 7, TA default: 7

[clayjohn]

Looks great now! Thank you!

[akien-mga]

Thanks!