vaColor

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 vec4 vaColor;

Valid Programs: all gbuffers/shadow

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The vertex color attribute, equivalent to gl_Color from the compatibility profile.

The color attribute is often used to apply tints to colored blocks such as leaves, grass, water, etc. It also contains the vanilla ao and, if enabled, the old lighting.

Enabling separateAo will move the AO from the rgb components of vaColor to the alpha component, which can be applied later like this:

vec3 color = vaColor.rgb * vaColor.a;