Add a 3D antialiasing demo

Author: Calinou

3d/antialiasing/README.md

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+# 3D Anti-Aliasing
+
+This project showcases the various 3D antialiasing techniques supported by Godot.
+
+- **Multisample antialiasing (MSAA):** High quality, high performance cost.
+  Does not blur the image.
+  - Does not affect shader-induced aliasing (such as specular aliasing) or alpha
+    scissor materials, so these will remain aliased.
+- **Fast approximate antialiasing (FXAA):** Medium quality, low performance cost.
+  Slightly blurs the image.
+- **Temporal antialiasing (TAA):** High-quality, low performance cost. Slightly
+  blurs the image (but less so than FXAA).
+  - Antialiasing quality is worse on fast-moving objects than other methods,
+    especially at lower framerates since the TAA won't have enough time to
+    converge on those objects.
+  - Can introduce ghosting artifacts on moving objects, especially if motion
+    vectors are not correctly generated from a given material shader.
+- **Supersampling (SSAA):** The highest-quality technique, but also the most
+  expensive. Does not blur the image.
+  - 200% resolution scale is equivalent to 4× SSAA, as each dimension is
+    doubled. For example, if running in a 1920×1080 window at 200% render scale,
+    the 3D framebuffer will be 3840×2160.
+  - SSAA can be used together with FXAA or TAA to counter the blurring added by
+    those algorithms, while further improving antialiasing quality.
+
+Godot allows using multiple antialiasing techniques at the same time. This can
+be useful to obtain the best possible quality, or to find a better performance
+tradeoff.
+
+Language: GDScript
+
+Renderer: Vulkan Clustered
+
+## Screenshots
+
+![Screenshot](screenshots/3d_anti_aliasing.png)

3d/antialiasing/checker.LICENSE.md

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+# License for `checker.png`
+
+Copyright (c) 2020 Kenney
+
+Licensed under CC0 1.0 Universal.
+
+Downloaded from https://kenney.nl/assets/prototype-textures

3d/antialiasing/checker.png

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://chjqieyps5n5r"
+path.s3tc="res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.s3tc.ctex"
+path.etc2="res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://checker.png"
+dest_files=["res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.s3tc.ctex", "res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/size_limit=0
+detect_3d/compress_to=0

3d/antialiasing/checker.png.import

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+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="Sky" id=1]
+
+[resource]
+background_mode = 2
+sky = SubResource( 1 )

3d/antialiasing/default_env.tres

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://8c1xtc7yj6s5"
+path.s3tc="res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.s3tc.ctex"
+path.etc2="res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=["res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.s3tc.ctex", "res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

3d/antialiasing/icon.png

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+# License for `paint.png` and `paint_normal.png`
+
+Copyright (c) 2010 johndn
+
+Licensed under CC BY 3.0 Unported.
+
+Downloaded from https://opengameart.org/content/splatter-pack

3d/antialiasing/icon.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ccgkupemr6e1q"
+path="res://.godot/imported/paint.png-26dd29729d733230544ae1ff468a1f09.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://paint.png"
+dest_files=["res://.godot/imported/paint.png-26dd29729d733230544ae1ff468a1f09.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/size_limit=0
+detect_3d/compress_to=1