gl_MultiTexCoord1

gl_MultiTexCoord1

Valid Programs: gbuffers_*.vsh, shadow.vsh

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Note

gl_MultiTexCoord2 is also valid for the same purposes.

gl_MultiTexCoord1 stores the block light level in the x component, and the sky light level in the y component. However, the exact range of the values is indeterminate (though it is currently 0-240). Therefore, it is recommended to use gl_TextureMatrix[1].

vec2 lmcoord = (gl_TextureMatrix[1] * gl_MultiTexCoord1).xy;

in ivec2 vaUV2;

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.

It is recommended to use the following matrix:

const mat4 TEXTURE_MATRIX_2 = mat4(vec4(0.00390625, 0.0, 0.0, 0.0), vec4(0.0, 0.00390625, 0.0, 0.0), vec4(0.0, 0.0, 0.00390625, 0.0), vec4(0.03125, 0.03125, 0.03125, 1.0));

vec2 lmcoord = (TEXTURE_MATRIX_2 * vec4(vaUV2, 0.0, 1.0)).xy;