Geometry Shader Concepts and Examples
Mike Bailey, Steve Cunningham · 2011
Texture Coordinates Texture coordinates specify the coordinates in texture space for each vertex of a graphics primitive. Texture coordinates are not part of the basic geometry of a primitive, but rather are an attribute attached to each vertex. In the vertex shader, the per-vertex texture coordinates are typically assigned to variables that can be interpolated by the rasterizer across the entire polygon and then given to the fragment shaders.