nether: move nether roof blocks into new class

overviewer_core/src/block_class.c

@@ -259,3 +259,15 @@ const mc_block_t block_class_alt_height[] = {
     block_purpur_slab,
     block_wooden_slab};
 const size_t block_class_alt_height_len = COUNT_OF(block_class_alt_height);
+
+const mc_block_t block_class_nether_roof[] = {
+    block_bedrock,
+    block_netherrack,
+    block_quartz_ore,
+    block_lava,
+    block_soul_sand,
+    block_basalt,
+    block_blackstone,
+    block_soul_soil,
+    block_nether_gold_ore};
+const size_t block_class_nether_roof_len = COUNT_OF(block_class_nether_roof);

overviewer_core/src/block_class.h

@@ -48,4 +48,7 @@ extern const size_t block_class_ancil_len;
 extern const mc_block_t block_class_alt_height[];
 extern const size_t block_class_alt_height_len;
 
+extern const mc_block_t block_class_nether_roof[];
+extern const size_t block_class_nether_roof_len;
+
 #endif

overviewer_core/src/overviewer.h

@@ -31,7 +31,7 @@
 
 // increment this value if you've made a change to the c extension
 // and want to force users to rebuild
-#define OVERVIEWER_EXTENSION_VERSION 89
+#define OVERVIEWER_EXTENSION_VERSION 90
 
 #include <stdbool.h>
 #include <stdint.h>

overviewer_core/src/primitives/nether.c

@@ -37,9 +37,7 @@ walk_chunk(RenderState* state, RenderPrimitiveNether* data) {
 
             for (y = NETHER_ROOF - 1; y >= 0; y--) {
                 blockid = get_data(state, BLOCKS, x, y - (state->chunky * 16), z);
-                if (block_class_is_subset(blockid, (mc_block_t[]){block_bedrock, block_netherrack,
-                    block_quartz_ore, block_lava, block_soul_sand, block_basalt, block_blackstone,
-                    block_soul_soil, block_nether_gold_ore}, 9))
+                if (block_class_is_subset(blockid, block_class_nether_roof, block_class_nether_roof_len))
                     data->remove_block[x + 1][y][z + 1] = true;
                 else
                     break;