Merge pull request #95004 from Calinou/doc-texture-import-premul-alpha

Document support 3D premultiplied alpha in ResourceImporterTexture

doc/classes/ResourceImporterTexture.xml

@@ -84,8 +84,8 @@
 		</member>
 		<member name="process/premult_alpha" type="bool" setter="" getter="" default="false">
 			An alternative to fixing darkened borders with [member process/fix_alpha_border] is to use premultiplied alpha. By enabling this option, the texture will be converted to this format. A premultiplied alpha texture requires specific materials to be displayed correctly:
-			- In 2D, a [CanvasItemMaterial] will need to be created and configured to use the [constant CanvasItemMaterial.BLEND_MODE_PREMULT_ALPHA] blend mode on [CanvasItem]s that use this texture.
-			- In 3D, there is no support for premultiplied alpha blend mode yet, so this option is only suited for 2D.
+			- In 2D, a [CanvasItemMaterial] will need to be created and configured to use the [constant CanvasItemMaterial.BLEND_MODE_PREMULT_ALPHA] blend mode on [CanvasItem]s that use this texture. In custom [code]@canvas_item[/code] shaders, [code]render_mode blend_premul_alpha;[/code] should be used.
+			- In 3D, a [BaseMaterial3D] will need to be created and configured to use the [constant BaseMaterial3D.BLEND_MODE_PREMULT_ALPHA] blend mode on materials that use this texture. In custom [code]spatial[/code] shaders, [code]render_mode blend_premul_alpha;[/code] should be used.
 		</member>
 		<member name="process/size_limit" type="int" setter="" getter="" default="0">
 			If set to a value greater than [code]0[/code], the size of the texture is limited on import to a value smaller than or equal to the value specified here. For non-square textures, the size limit affects the longer dimension, with the shorter dimension scaled to preserve aspect ratio. Resizing is performed using cubic interpolation.