libblock.raycast: Add argument to specify blocks to ignore during ray casting

libentity.raycast: Add argument to specify blocks to ignore during ray casting
Chunk::rayCast: Add argument to specify blocks to ignore during ray casting.

On lua side filter blocks are passed as list of strings in form of "MOD:BLOCK_NAME"
On C++ size filter blocks are std::set of blockid_t

src/voxels/Chunks.cpp

@@ -414,7 +414,8 @@ voxel* Chunks::rayCast(
     float maxDist,
     glm::vec3& end,
     glm::ivec3& norm,
-    glm::ivec3& iend
+    glm::ivec3& iend,
+    std::set<blockid_t> filter
 ) {
     float px = start.x;
     float py = start.y;
@@ -454,8 +455,10 @@ voxel* Chunks::rayCast(
         if (voxel == nullptr) {
             return nullptr;
         }
+
         const auto& def = indices->blocks.require(voxel->id);
-        if (def.selectable) {
+        if ((filter.empty() && def.selectable) ||
+            (!filter.empty() && filter.find(def.rt.id) == filter.end())) {
             end.x = px + t * dx;
             end.y = py + t * dy;
             end.z = pz + t * dz;

src/voxels/Chunks.hpp

@@ -4,6 +4,7 @@
 
 #include <glm/glm.hpp>
 #include <memory>
+#include <set>
 #include <vector>
 
 #include "typedefs.hpp"
@@ -93,7 +94,8 @@ public:
         float maxLength,
         glm::vec3& end,
         glm::ivec3& norm,
-        glm::ivec3& iend
+        glm::ivec3& iend,
+        std::set<blockid_t> filter = {}
     );
 
     glm::vec3 rayCastToObstacle(glm::vec3 start, glm::vec3 dir, float maxDist);