Made navmesh compile on Windows

Small updates to remove warnings
Testing nonuniform descriptor access in shader

code/vulkan/shaders/basic.vert

@@ -16,6 +16,7 @@ readonly buffer Vertices {
 
 layout(location = 0) out vec2 frag_uv;
 layout(location = 1) out vec4 frag_c;
+layout(location = 2) out flat uint idx;
 
 void main() {
 	Vertex v = vtx[gl_VertexIndex];
@@ -25,4 +26,6 @@ void main() {
 	frag_uv = v.uv;
 	frag_c  = vec4((v.c >> 24) & 0xFF, (v.c >> 16) & 0xFF, (v.c >> 8) & 0xFF, (v.c >> 0) & 0xFF) / 255.0f;
 	frag_c  = frag_c.abgr;
+
+	idx = v.pad;
 }