Add new hook to allow modification of lightmap via Dimension special effects (#8863)

src/main/java/net/minecraftforge/client/extensions/IForgeDimensionSpecialEffects.java

@@ -7,6 +7,7 @@ package net.minecraftforge.client.extensions;
 
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Matrix4f;
+import com.mojang.math.Vector3f;
 import net.minecraft.client.Camera;
 import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.client.renderer.DimensionSpecialEffects;
@@ -61,4 +62,20 @@ public interface IForgeDimensionSpecialEffects
     {
         return false;
     }
+
+    /**
+     * Allows for manipulating the coloring of the lightmap texture.
+     * Will be called for each 16*16 combination of sky/block light values.
+     *
+     * @param level        The current level (client-side).
+     * @param partialTicks Progress between ticks.
+     * @param skyDarken    Current darkness of the sky.
+     * @param skyLight     Sky light brightness factor.
+     * @param blockLight   Block light brightness factor.
+     * @param pixelX       X-coordinate of the lightmap texture.
+     * @param pixelY       Y-coordinate of the lightmap texture.
+     * @param colors       The color values that will be used: [r, g, b].
+     * @see LightTexture#updateLightTexture(float)
+     */
+    default void adjustLightmapColors(ClientLevel level, float partialTicks, float skyDarken, float skyLight, float blockLight, int pixelX, int pixelY, Vector3f colors) {}
 }