Java Edition 21w10a

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 "title": "Minecraft 21w10a",
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 "field": "''(link to Java Edition article, displayed as Java Edition)''",
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 "field": "March 10, 2021",
 "label": "Release date"
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 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 "field": "[https://piston-data.mojang.com/v1/objects/7840a9b8d9aeb480b16962c40a2ca3758893f00e/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/40a9d63c50dc098824ff9117cc19e39afb61598d/21w10a.json .json])<br />[https://piston-data.mojang.com/v1/objects/5998d2c7c15fea04b2541efdcbec4c8cfe5df2a6/server.jar Server]",
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 "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741842<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000012",
 "label": "(link to Protocol version article, displayed as Protocol version)"
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 "label": "(link to Data version article, displayed as Data version)"
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 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
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 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w08b|◄  21w08b]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w10a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w11a| 21w11a ►]]\n</td>\n</tr>\n</table>"
}

21w10a is the thirteenth snapshot for Java Edition 1.17, released on March 10, 2021,^[1] which adds lush caves and new deepslate variants.

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Cracked deepslate bricks

• A cracked variation of deepslate bricks.
• Obtained by smelting deepslate bricks.

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Cracked deepslate tiles

• A cracked variation of deepslate tiles.
• Obtained by smelting deepslate tiles.

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Deepslate ores

• Added deepslate ore variants for copper, emerald and coal ore.
  • Do not generate by default; they only have been added for use by creators of maps and data packs.
  • Like other deepslate ores, they can be used in blasting and smelting recipes like normal ores.
    • Again, like other deepslate ores, they unlock these recipes in the recipe book.

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Infested deepslate

• An infested variant of deepslate.

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Azalea tree

• Generate above lush caves, either on the surface or underground.
• Consist of azalea leaves (both variants), oak logs and rooted dirt.

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Lush caves

• Currently the biome is only accessible in single-biome worlds.
• Adaptive to the environment: every type of cave generation can be a lush cave.
• Moss blocks cover the floors and ceilings, along with moss carpets and grass on the floors.
• Spore blossoms grow from the ceiling and drip particles.
• Contains clay pools where dripleaf plants grow out of them.
  • Clay pools sometimes generate water sources over air, and the water is suspended and does not flow. This has yet to be fixed.
• Contains azalea bushes (both variants).
• Cave vines with glow berries grow from the ceiling and light up the caves.

Shaders

• Are now included for all supported render states.
• Any shader except for the blitting shader can also be replaced in resource packs.
• For now replacing these shaders is not officially supported and the way it works may change in the future.
• Current rendering engine uses a system similar to the post-processing shader pipeline. There are some differences between both systems that cater to slightly different requirements.

Tags

• Added the coal_ores, copper_ores, and emerald_ores block and item tags.
  • Contain both the normal and deepslate ores of each ore type.
• Added the lush_ground_replaceable block tag.
  • Contains the #lush_plants_replaceable block tag, clay, and moss block.

Deepslate diamond ore, deepslate gold ore, deepslate iron ore, deepslate lapis lazuli ore, deepslate redstone ore, coal ore, diamond ore, iron ore, gold ore

• The textures of these ores have been changed.
  • Iron ore and deepslate iron ore no longer have streaks, better matching the appearance of other ores.
  • Diamond ore closer resembles deepslate diamond ore.

Cobbled deepslate

• The texture has been changed.
• Can now be smelted back into deepslate.

Deepslate

• Both the top and side textures have been changed.
• Deepslate can now be placed along any axis.
• Textures in caves now generate with a random rotation.

Deepslate bricks and deepslate tiles

• Can now be crafted.

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End gateway block

• Particle field has been visually enlarged.
• End sky texture in the background is now stretched to fit the whole screen, rather than being tiled and rotated as was done previously.

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End portal block

• Particle field has been visually enlarged.
• End sky texture in the background is now stretched to fit the whole screen, rather than being tiled and rotated as was done previously.

Lava

• Now replaces air below Y=-53.

Lightning rod

• Changelog states they can now be waterlogged, though this is not the case.

Moss block

• Using bone meal on it now spreads moss to blocks on any height.

Spyglass

• The item model has been changed back to a dedicated texture.
  • Similar to tridents, the spyglass still uses a 3d model in the hand.
  • The texture is different from the original item texture.

Slime

• The maximum size that slimes can be summoned with is now 128.

Crack carvers

• Now are much less common.

Fossils

• The fossils in the deepest part of the underground generate with deepslate diamond ore instead of coal ore.

Ore distribution

• Now generates more emerald ore in mountains.
• Now generates more lapis lazuli ore.
• Now generates less copper ore, gold ore, and redstone ore.
• Now generates smaller diamond ore blobs, but slightly more frequent (less diamond ore overall though).
• Now generates less iron ore, and it generates lower down.
  • The deepest iron generation range: previously Y=-64 to -8, now Y=-64 to -32.
  • The middle iron generation range: previously Y=-16 to 80 (most at 32), now Y=-24 to 56 (most at 16).
• Reduced air exposure for coal ore.

/give

• The give command can only give up to 100 stacks of items at a time (e.g. 6400 stone or 100 iron swords)

/spawnpoint

• Can no longer set a player's spawnpoint to areas that are out of the world.

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Glowing

• Glowing is now based on the outline of all layers on an entity, not just the base layer.

Game library updates

• Rendering is now using OpenGL 3.2 core profile.
  • All fixed function rendering has been replaced with shader-based rendering.

Splashes

• Changed the splash "OpenGL 2.1 (if supported)!" to "Now on OpenGL 3.2 core profile!"

Subtitles

• Glow item frames have their own subtitles, no longer using the same subtitles as normal item frames.

Tags

• Removed moss block, the #flowers block tag, grass, tall grass, moss carpet, small dripleaf, big dripleaf, big dripleaf stem, and vines from the lush_plants_replaceable block tag.
• Removed the azalea_log_replaceable block tag.

55 issues fixed

From released versions before 1.17

• MC-29318 – Client misses inventory updates while the player is manipulating items - causing invisible items.
• MC-32452 – Fog generates only in the center of the screen.
• MC-84121 – Shape of the glow effect is based on the mob's base layer.
• MC-87019 – Only visible slots are updated clientside when you are inside an inventory.
• MC-91888 – Hotkeying books on enchantment table causing client-side item count inaccuracy.
• MC-93243 – Fog Rendering On AMD Graphics Cards & Integrated Graphics.
• MC-124109 – Horses glitched with glowing effect.
• MC-135561 – Failed to create OpenGL context on some Linux systems with Nvidia driver.
• MC-148071 – If you switch to a crossbow after charging another bow/crossbow, the crossbow you switched to will go weird for a second in the hotbar.
• MC-148206 – Hand punching animation is played after eating crops while looking at a block.
• MC-154094 – Lectern running /clear turns items into ghost items.
• MC-165208 – Text and other UI elements are completely black when being affected by night vision and void/blindness simultaneously.
• MC-175964 – Setblock command run by book in lectern to clear inventory run in command block causes ghost items.
• MC-182455 – Entity shadow texture glitching with a resource pack.
• MC-186864 – Leather armor can appear white.
• MC-194675 – While spectating a creeper, enderman, spider, or cave spider, UI elements are rendered completely white.
• MC-201316 – The /give command can create so many items that the game will freeze.
• MC-210408 – /spawnpoint allows players to set their spawnpoint to out-of-bounds coordinates, which crashes the game when trying to respawn.
• MC-212168 – + Pick Block does not copy block state "lit".
• MC-214629 – FOV decreases when underwater regardless of FOV Effects accessibility setting.
• MC-215534 – Spectating a mob with a shader whilst having a carved pumpkin equipped turns the screen completely white.
• MC-216510 – The world border red effect, affects the brightness of a mob's shader.

From the 1.17 development versions

• MC-204782 – The glowing effect outline no longer renders (Intel Graphics on macOS).
• MC-205112 – Enchantment glint appears white while inside powder snow.
• MC-206628 – Emptied Bundles have an empty Item Tag.
• MC-207818 – Placing a sign from the offhand closes the sign UI immediately.
• MC-208301 – /clear does not properly affect the item on the mouse pointer after crafting it.
• MC-208836 – Villager incorrectly holding spyglass.
• MC-211666 – Guardians attack invisible axolotls.
• MC-212127 – Normal ink sac and glow ink sac are not grouped in the creative inventory.
• MC-212144 – Subtitles refer to Glow Item Frame as "Item Frame".
• MC-212216 – Repeatedly clicking on a sign with an ink sac or glow ink sac abruptly stops the hand animation.
• MC-212236 – Cannot visually critical-hit a glow squid (No sound/particles).
• MC-212314 – Glow squid remains dark even if there is a light source block next to it.
• MC-212325 – Glow Squid entity data (potion effects, custom name, ...) does not get saved.
• MC-213825 – Using bone meal on a moss block only spreads moss to blocks on the same Y level.
• MC-214781 – Lava does not generate at the very bottom of noise caves.
• MC-214784 – Fossils can generate floating in caves.
• MC-214836 – Water caves cause the land to be excessively flooded.
• MC-214844 – Bedrock can be exposed to the air at the very bottom of the new caves.
• MC-214970 – Phantoms continuously make too much flapping sounds.
• MC-215194 – Structure blocks do not work below Y=0.
• MC-215838 – There is currently no way to craft deepslate tiles and deepslate bricks.
• MC-215847 – Infested stone generates in deepslate areas below mountain biomes.
• MC-215850 – Deepslate Tile Wall comes before Deepslate Brick Wall but Deepslate Bricks come before Deepslate Tiles in creative inventory.
• MC-215939 – Emerald ore spawns in lower frequencies than it should above Y=100.
• MC-216136 – Polished deepslate slab isn't grouped with the other deepslate slabs in the creative inventory.
• MC-216363 – Crash upon replacing soul sand or magma with the other under a tall bubble column using /setblock.
• MC-216492 – Fox incorrectly holding spyglass.
• MC-216735 – Stone Lapis Ore generating in Deepslate.
• MC-216736 – Lava lakes generate exposure in caves.
• MC-216738 – Deepslate diamond ore texture is shifted a pixel to the right.
• MC-216765 – Coal ore can generate below Y=0 when attached to a fossil.
• MC-216817 – Inconsistency: Cobbled deepslate cannot be smelted back into deepslate.

From the previous development version

• MC-217020 – Gold ore and deepslate gold ore textures are inconsistent.