first commit

shaderpacks/Reimagined - High/shaders/lib/util/miplevel.glsl

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+vec2 midCoordPos = absMidCoordPos * signMidCoordPos;
+
+#include "/lib/util/dFdxdFdy.glsl"
+
+vec2 mipx = dcdx / absMidCoordPos * 8.0;
+vec2 mipy = dcdy / absMidCoordPos * 8.0;
+
+float mipDelta = max(dot(mipx, mipx), dot(mipy, mipy));
+float miplevel = max(0.5 * log2(mipDelta), 0.0);
+
+#if !defined GBUFFERS_ENTITIES && !defined GBUFFERS_HAND
+    vec2 atlasSizeM = atlasSize;
+#else
+    vec2 atlasSizeM = atlasSize.x + atlasSize.y > 0.5 ? atlasSize : textureSize(tex, 0);
+#endif