vaUV0

Danger

This attribute only works with the “core profile” in Minecraft 1.17 and newer. It is recommended to use the “compatibility profile” with Iris for better support.

in vec2 vaUV0;

Valid Programs: all gbuffers/shadow

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The vertex texture coordinate attribute, equivalent to gl_MultiTexCoord0 from the compatibility profile.

Usually the coordinate in vaUV0 corresponds directly to the atlas texture coordinate, however some geometry (such as enchantment glint) requires a texture matrix. Therefore it is always recommended to use textureMatrix (or gl_TextureMatrix[0] in the compatibility profile) in gbuffers-style programs.

vec2 coord = (textureMatrix * vec4(vaUV0, 0.0, 1.0)).xy;

vec2 coord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;