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mc_Entity

in vec2 mc_Entity;

Valid Programs: terrain (gbuffers_terrain, gbuffers_water, shadow)

The x component stores block ID which was assigned to the current block in the block.properties file. If an ID for the current block is not defined, a value of -1 (newer Iris versions) or 0 (older Iris versions, Optifine) is sent.

Note: newer Iris versions use a signed short, meaning they can store IDs from -32768 to 32767. Older Iris versions and Optifine do not support negative values.

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