debugging the BSP

[dosdemo] / src / bsptree.c

diff --git a/src/bsptree.c b/src/bsptree.c
index e9353d1..30f67ef 100644 (file)
--- a/src/bsptree.c
+++ b/src/bsptree.c
@@ -18,6 +18,7 @@ static void free_tree(struct bspnode *n);
 
 static struct bspnode *new_node(struct g3d_vertex *v, int vnum);
 static struct bspnode *add_poly_tree(struct bspnode *n, struct g3d_vertex *v, int vnum);
+static void draw_bsp_tree(struct bspnode *n, const vec3_t *vdir);
 
 static void save_bsp_tree(struct bspnode *n, FILE *fp);
 static struct bspnode *load_bsp_tree(FILE *fp);
@@ -118,6 +119,11 @@ int bsp_add_mesh(struct bsptree *bsp, struct g3d_mesh *m)
 
 void draw_bsp(struct bsptree *bsp, float view_x, float view_y, float view_z)
 {
+       vec3_t vdir;
+       vdir.x = view_x;
+       vdir.y = view_y;
+       vdir.z = view_z;
+       draw_bsp_tree(bsp->root, &vdir);
 }
 
 static int count_nodes(struct bspnode *n)
@@ -233,6 +239,24 @@ static struct bspnode *add_poly_tree(struct bspnode *n, struct g3d_vertex *v, in
        return n;
 }
 
+static void draw_bsp_tree(struct bspnode *n, const vec3_t *vdir)
+{
+       float dot;
+
+       if(!n) return;
+
+       dot = vdir->x * n->plane.nx + vdir->y * n->plane.ny + vdir->z * n->plane.nz;
+       if(dot >= 0.0f) {
+               draw_bsp_tree(n->front, vdir);
+               g3d_draw_indexed(n->vcount, n->verts, n->vcount, 0, 0);
+               draw_bsp_tree(n->back, vdir);
+       } else {
+               draw_bsp_tree(n->back, vdir);
+               g3d_draw_indexed(n->vcount, n->verts, n->vcount, 0, 0);
+               draw_bsp_tree(n->front, vdir);
+       }
+}
+
 static void save_bsp_tree(struct bspnode *n, FILE *fp)
 {
        /* TODO */