+void move_player(struct player *p, int right, int fwd)
+{
+ static const int step[][2] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
+ int fdir, rdir;
+ float angle;
+ cgm_vec3 vdir = {0, 0, -1};
+
+ cgm_vmul_m3v3(&vdir, p->view_xform);
+
+ angle = atan2(vdir.z, vdir.x) + 3.0 * M_PI;
+ fdir = (p->dir + (int)(2.0 * angle / M_PI)) & 3;
+
+ rdir = (fdir + 1) & 3;
+ p->cx += step[fdir][0] * fwd + step[rdir][0] * right;
+ p->cy += step[fdir][1] * fwd + step[rdir][1] * right;
+}
+
+void turn_player(struct player *p, int turn)
+{
+ if(!turn) return;
+ turn = turn > 0 ? 1 : 3;
+ p->dir = (p->dir + turn) & 3;
+ p->theta = 0;
+}
+