feat: add click to select

destrum/assets_src/shaders/mesh.vert

@@ -9,6 +9,7 @@ layout (location = 1) out vec2 outUV;
 layout (location = 2) out vec3 outNormal;
 layout (location = 3) out vec4 outTangent;
 layout (location = 4) flat out uint outMaterialID;
+layout (location = 5) flat out uint outObjectID;
 
 // The depth pre-pass reuses this shader, positions have to match bit for bit
 // so the main pass can depth test against it with LESS_OR_EQUAL
@@ -34,4 +35,5 @@ void main()
     // w is the bitangent sign, the fragment shader builds the TBN from the interpolated vectors
     outTangent = vec4(mat3(instance.transform) * v.tangent.xyz, v.tangent.w);
     outMaterialID = instance.materialID;
+    outObjectID = instance.objectID;
 }