mc_Entity

in vec2 mc_Entity;

Valid Programs: terrain (gbuffers_terrain, gbuffers_water, shadow)

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The x component stores the block ID which was assigned to the current block in block.properties. If an ID for the current block is not defined, a value of -1 is sent.

Tip

Iris 1.3 and later (as well as Optifine) use a signed short for mc_Entity, meaning they can store IDs from -32768 to 32767. Older Iris versions do not support negative values, and will send the maximum unsigned value,65535, for any blocks with unassigned IDs.

When block.properties is not present in the shader pack files, a legacy fallback is used. This assigns most block IDs according to their pre 1.13 numerical values, as described in the Minecraft Wiki. This is intended for legacy purposes, and should not be used for new shader packs.

The y component stores the “render type”, which is 1 for fluids (water, lava, etc) and -1 for all other blocks.

This attribute is only available for terrain. For other types of geometry, see entityid and blockentityid.