Fixed negative chunks invisible

Shaders/shader.vert

@@ -82,7 +82,7 @@ void main()
     uint faceIndex = gl_VertexID / 6u;
     uint vertIndex = gl_VertexID % 6u;
 
-    uint start = faceIndex * 2u; // 2 byte per face
+    uint start = faceIndex * 2u; // 2 uint per face
      
     uint u0 = faces[start]; // data in uint 0
     uint u1 = faces[start + 1]; // data in uint 1
@@ -95,7 +95,8 @@ void main()
     uint texture = u1 & 0xFFu;
     uint lightLevel = (u1 >> 8) & 0xFFu;
 
-    vec3 basePos = vec3(x + chunkX * 16, y, z + chunkY * 16);
+    vec3 basePos = vec3(x, y, z) + vec3(chunkX, 0, chunkY) * 16.0;
+
     vec4 worldPos = vec4(basePos + offsets[facing][vertIndex], 1.0);
     float light = float(lightLevel) / 255.0; // use later for caves and stuff