Fix the Emissive Rendering for Experimental Light Pipeline (#9651)

src/main/java/net/minecraftforge/client/model/lighting/FlatQuadLighter.java

@@ -38,7 +38,7 @@ public class FlatQuadLighter extends QuadLighter
         isFullCube = Block.isShapeFullBlock(state.getCollisionShape(level, pos));
         for (Direction side : SIDES)
         {
-            packedLight[side.ordinal()] = getLightColor(level, pos.relative(side), state);
+            packedLight[side.ordinal()] = LevelRenderer.getLightColor(level, state, pos.relative(side));
         }
         //Note: We can just use the LevelRenderer method as we know the state is the state at the given position
         packedLight[6] = LevelRenderer.getLightColor(level, state, pos);

src/main/java/net/minecraftforge/client/model/lighting/QuadLighter.java

@@ -158,6 +158,7 @@ public abstract class QuadLighter
      * as it only uses the state for querying if the state has emissive rendering but instead looks up the state at the given position for checking the
      * light emission.
      */
+    @Deprecated(since = "1.20.1")
     protected static int getLightColor(BlockAndTintGetter level, BlockPos pos, BlockState state)
     {
         if (state.emissiveRendering(level, pos))

src/main/java/net/minecraftforge/client/model/lighting/SmoothQuadLighter.java

@@ -50,7 +50,7 @@ public class SmoothQuadLighter extends QuadLighter
                     pos.setWithOffset(origin, x - 1, y - 1, z - 1);
                     BlockState neighborState = level.getBlockState(pos);
                     t[x][y][z] = neighborState.getLightBlock(level, pos) < 15;
-                    int brightness = getLightColor(level, pos, state);
+                    int brightness = LevelRenderer.getLightColor(level, neighborState, pos);
                     s[x][y][z] = LightTexture.sky(brightness);
                     b[x][y][z] = LightTexture.block(brightness);
                     ao[x][y][z] = neighborState.getShadeBrightness(level, pos);