Improve and clarify texture filtering documentation

- Mention the Use Nearest Mipmap Filter project setting.
- Fix nearest mipmap claiming to always use bilinear filtering
  (it uses trilinear filtering by default, like linear mipmap).

(cherry picked from commit 47cadda3ad)

doc/classes/BaseMaterial3D.xml

@@ -498,22 +498,22 @@
 			Represents the size of the [enum TextureParam] enum.
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST" value="0" enum="TextureFilter">
-			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering, but the texture will look pixelized.
+			The texture filter reads from the nearest pixel only. This makes the texture look pixelated from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR" value="1" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels. Use this when you want to avoid a pixelated style, but do not want mipmaps.
+			The texture filter blends between the nearest 4 pixels. This makes the texture look smooth from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST_WITH_MIPMAPS" value="2" enum="TextureFilter">
-			The texture filter reads from the nearest pixel in the nearest mipmap. The fastest way to read from textures with mipmaps.
+			The texture filter reads from the nearest pixel and blends between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look pixelated from up close, and smooth from a distance.
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR_WITH_MIPMAPS" value="3" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps. Use this for most cases as mipmaps are important to smooth out pixels that are far from the camera.
+			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look smooth from up close, and smooth from a distance.
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC" value="4" enum="TextureFilter">
-			The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			The texture filter reads from the nearest pixel and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look pixelated from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC" value="5" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			The texture filter blends between the nearest 4 pixels and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look smooth from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
 		</constant>
 		<constant name="TEXTURE_FILTER_MAX" value="6" enum="TextureFilter">
 			Represents the size of the [enum TextureFilter] enum.

doc/classes/CanvasItem.xml

@@ -660,24 +660,26 @@
 			The [CanvasItem] will inherit the filter from its parent.
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST" value="1" enum="TextureFilter">
-			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering. Useful for pixel art.
+			The texture filter reads from the nearest pixel only. This makes the texture look pixelated from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR" value="2" enum="TextureFilter">
-			The texture filter blends between the nearest four pixels. Use this for most cases where you want to avoid a pixelated style.
+			The texture filter blends between the nearest 4 pixels. This makes the texture look smooth from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST_WITH_MIPMAPS" value="3" enum="TextureFilter">
-			The texture filter reads from the nearest pixel in the nearest mipmap. This is the fastest way to read from textures with mipmaps.
+			The texture filter reads from the nearest pixel and blends between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look pixelated from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR_WITH_MIPMAPS" value="4" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps. Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
+			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look smooth from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC" value="5" enum="TextureFilter">
-			The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
-			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_NEAREST_WITH_MIPMAPS] is usually more appropriate.
+			The texture filter reads from the nearest pixel and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look pixelated from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_NEAREST_WITH_MIPMAPS] is usually more appropriate in this case.
 		</constant>
 		<constant name="TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC" value="6" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
-			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_LINEAR_WITH_MIPMAPS] is usually more appropriate.
+			The texture filter blends between the nearest 4 pixels and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look smooth from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_LINEAR_WITH_MIPMAPS] is usually more appropriate in this case.
 		</constant>
 		<constant name="TEXTURE_FILTER_MAX" value="7" enum="TextureFilter">
 			Represents the size of the [enum TextureFilter] enum.

doc/classes/RenderingServer.xml

@@ -5033,22 +5033,26 @@
 			Uses the default filter mode for this [Viewport].
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_NEAREST" value="1" enum="CanvasItemTextureFilter">
-			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering, but the texture will look pixelized.
+			The texture filter reads from the nearest pixel only. This makes the texture look pixelated from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_LINEAR" value="2" enum="CanvasItemTextureFilter">
-			The texture filter blends between the nearest 4 pixels. Use this when you want to avoid a pixelated style, but do not want mipmaps.
+			The texture filter blends between the nearest 4 pixels. This makes the texture look smooth from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS" value="3" enum="CanvasItemTextureFilter">
-			The texture filter reads from the nearest pixel in the nearest mipmap. The fastest way to read from textures with mipmaps.
+			The texture filter reads from the nearest pixel and blends between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look pixelated from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS" value="4" enum="CanvasItemTextureFilter">
-			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps.
+			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look smooth from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC" value="5" enum="CanvasItemTextureFilter">
-			The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera.
+			The texture filter reads from the nearest pixel and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look pixelated from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS] is usually more appropriate in this case.
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC" value="6" enum="CanvasItemTextureFilter">
-			The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing.
+			The texture filter blends between the nearest 4 pixels and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look smooth from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS] is usually more appropriate in this case.
 		</constant>
 		<constant name="CANVAS_ITEM_TEXTURE_FILTER_MAX" value="7" enum="CanvasItemTextureFilter">
 			Max value for [enum CanvasItemTextureFilter] enum.

doc/classes/Viewport.xml

@@ -543,16 +543,18 @@
 		<constant name="DEBUG_DRAW_MOTION_VECTORS" value="25" enum="DebugDraw">
 		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST" value="0" enum="DefaultCanvasItemTextureFilter">
-			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering, but the texture will look pixelized.
+			The texture filter reads from the nearest pixel only. This makes the texture look pixelated from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_LINEAR" value="1" enum="DefaultCanvasItemTextureFilter">
-			The texture filter blends between the nearest 4 pixels. Use this when you want to avoid a pixelated style, but do not want mipmaps.
+			The texture filter blends between the nearest 4 pixels. This makes the texture look smooth from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS" value="2" enum="DefaultCanvasItemTextureFilter">
-			The texture filter reads from the nearest pixel in the nearest mipmap. The fastest way to read from textures with mipmaps.
+			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look smooth from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS" value="3" enum="DefaultCanvasItemTextureFilter">
-			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps.
+			The texture filter reads from the nearest pixel and blends between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look pixelated from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_MAX" value="4" enum="DefaultCanvasItemTextureFilter">
 			Max value for [enum DefaultCanvasItemTextureFilter] enum.

doc/classes/VisualShaderNodeTextureParameter.xml

@@ -57,24 +57,26 @@
 			Sample the texture using the filter determined by the node this shader is attached to.
 		</constant>
 		<constant name="FILTER_NEAREST" value="1" enum="TextureFilter">
-			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering, but the texture will look pixelized.
+			The texture filter reads from the nearest pixel only. This makes the texture look pixelated from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="FILTER_LINEAR" value="2" enum="TextureFilter">
-			The texture filter blends between the nearest four pixels. Use this for most cases where you want to avoid a pixelated style.
+			The texture filter blends between the nearest 4 pixels. This makes the texture look smooth from up close, and grainy from a distance (due to mipmaps not being sampled).
 		</constant>
 		<constant name="FILTER_NEAREST_MIPMAP" value="3" enum="TextureFilter">
-			The texture filter reads from the nearest pixel in the nearest mipmap. This is the fastest way to read from textures with mipmaps.
+			The texture filter reads from the nearest pixel and blends between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look pixelated from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="FILTER_LINEAR_MIPMAP" value="4" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps. Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
+			The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]). This makes the texture look smooth from up close, and smooth from a distance.
+			Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom or sprite scaling), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels.
 		</constant>
 		<constant name="FILTER_NEAREST_MIPMAP_ANISOTROPIC" value="5" enum="TextureFilter">
-			The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
-			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant FILTER_LINEAR_MIPMAP] is usually more appropriate.
+			The texture filter reads from the nearest pixel and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look pixelated from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant FILTER_NEAREST_MIPMAP] is usually more appropriate in this case.
 		</constant>
 		<constant name="FILTER_LINEAR_MIPMAP_ANISOTROPIC" value="6" enum="TextureFilter">
-			The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
-			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant FILTER_LINEAR_MIPMAP] is usually more appropriate.
+			The texture filter blends between the nearest 4 pixels and blends between 2 mipmaps (or uses the nearest mipmap if [member ProjectSettings.rendering/textures/default_filters/use_nearest_mipmap_filter] is [code]true[/code]) based on the angle between the surface and the camera view. This makes the texture look smooth from up close, and smooth from a distance. Anisotropic filtering improves texture quality on surfaces that are almost in line with the camera, but is slightly slower. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level].
+			[b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant FILTER_LINEAR_MIPMAP] is usually more appropriate in this case.
 		</constant>
 		<constant name="FILTER_MAX" value="7" enum="TextureFilter">
 			Represents the size of the [enum TextureFilter] enum.