+void g3d_light_dir(int idx, float x, float y, float z)
+{
+ int mvtop = st->mtop[G3D_MODELVIEW];
+
+ st->lt[idx].type = LT_DIR;
+ st->lt[idx].x = x;
+ st->lt[idx].y = y;
+ st->lt[idx].z = z;
+
+ /* calc the normal matrix */
+ memcpy(st->norm_mat, st->mat[G3D_MODELVIEW][mvtop], 16 * sizeof(float));
+ st->norm_mat[12] = st->norm_mat[13] = st->norm_mat[14] = 0.0f;
+
+ xform4_vec3(st->norm_mat, &st->lt[idx].x);
+
+ NORMALIZE(&st->lt[idx].x);
+}
+