I am trying to write a shader that highlight the edge between each pair of vertices, much like the UCLA Wireframe Shader.
All implementations I came across require geometry shader support. I am wondering if this is possible with just vertex and fragment shaders?
(Of course, I can use texture to workaround it; but I am trying to avoid create custom textures for each model that I need this effect. On the other hand, I could just use geometry shader but it presents quite a problem when porting to iOS, which lacks support.)