Implement KHR_meshopt_compression extension

Author: pablode

README.md

@@ -83,6 +83,7 @@ KHR_materials_unlit                 | ✅ Complete
 KHR_materials_variants              | ✅ Complete
 KHR_materials_volume                | ✅ Partial <sup>2</sup>
 KHR_mesh_quantization               | ✅ Complete
+KHR_meshopt_compression             | ✅ Complete
 KHR_texture_transform               | ✅ Complete
 
 <sup>\[1\]</sup> Spotlight cone falloff is ignored.  

src/libguc/src/cgltf_util.cpp

@@ -65,6 +65,7 @@ namespace detail
            strcmp(name, "KHR_materials_variants") == 0 ||
            strcmp(name, "KHR_materials_volume") == 0 ||
            strcmp(name, "KHR_mesh_quantization") == 0 ||
+           strcmp(name, "KHR_meshopt_compression") == 0 ||
            strcmp(name, "KHR_texture_transform") == 0;
   }
 
@@ -408,6 +409,10 @@ namespace detail
       case cgltf_meshopt_compression_filter_exponential:
         meshopt_decodeFilterExp(result, mc.count, mc.stride);
         break;
+
+      case cgltf_meshopt_compression_filter_color:
+        meshopt_decodeFilterColor(result, mc.count, mc.stride);
+        break;
       }
 
       bufferView.data = result;