10glup_in 
float clip_dist;
 
   11glup_flat glup_in glup_id primitive_id;
 
   15    if(glupIsEnabled(GLUP_CLIPPING) && (clip_dist < 0.0)) {
 
   19    if(glupIsEnabled(GLUP_PICKING)) {
 
   20        glup_FragColor = glup_picking(
int(primitive_id));
 
   25    if(glupIsEnabled(GLUP_VERTEX_COLORS)) {
 
   28        result = GLUP.front_color;
 
   30    if(glupIsEnabled(GLUP_TEXTURING)) {
 
   31        result = glup_texturing(result, tex_coord);
 
   33    glup_FragColor = result;
 
vecng< 4, Numeric::float64 > vec4
Represents points and vectors in 4d.