static int clip_edge(struct g3d_vertex *poly, int *vnumptr,
const struct g3d_vertex *v0, const struct g3d_vertex *v1,
const struct cplane *plane);
+static int check_clip_edge(const struct g3d_vertex *v0,
+ const struct g3d_vertex *v1, const struct cplane *plane);
static int clip_edge_frustum(struct g3d_vertex *poly, int *vnumptr,
const struct g3d_vertex *v0, const struct g3d_vertex *v1, int fplane);
static float distance_signed(float *pos, const struct cplane *plane);
return edges_clipped > 0 ? 0 : 1;
}
+int check_clip_poly(const struct g3d_vertex *v, int vnum, struct cplane *plane)
+{
+ int i, nextidx, res;
+ int edges_clipped = 0;
+
+ for(i=0; i<vnum; i++) {
+ nextidx = i + 1;
+ if(nextidx >= vnum) nextidx = 0;
+ res = check_clip_edge(v + i, v + nextidx, plane);
+ if(res == 0) {
+ ++edges_clipped;
+ }
+ }
+ return edges_clipped ? 0 : res;
+}
int clip_frustum(struct g3d_vertex *vout, int *voutnum,
const struct g3d_vertex *vin, int vnum, int fplane)
return 0;
}
+/* same as above, but only checks for clipping and classifies the edge */
+static int check_clip_edge(const struct g3d_vertex *v0,
+ const struct g3d_vertex *v1, const struct cplane *plane)
+{
+ float pos0[3], pos1[3];
+ float d0, d1;
+
+ pos0[0] = v0->x; pos0[1] = v0->y; pos0[2] = v0->z;
+ pos1[0] = v1->x; pos1[1] = v1->y; pos1[2] = v1->z;
+
+ d0 = distance_signed(pos0, plane);
+ d1 = distance_signed(pos1, plane);
+
+ if(d0 > 0.0f && d1 > 0.0f) {
+ return 1;
+ }
+ if(d0 < 0.0f && d1 < 0.0f) {
+ return -1;
+ }
+ return 0;
+}
static float distance_signed(float *pos, const struct cplane *plane)
{
int clip_poly(struct g3d_vertex *vout, int *voutnum,
const struct g3d_vertex *vin, int vnum, struct cplane *plane);
+/* only checks if the polygon would be clipped by the plane, and classifies it
+ * as inside/outside/straddling, without actually producing a clipped polygon.
+ * return values are the same as clip_poly.
+ */
+int check_clip_poly(const struct g3d_vertex *v, int vnum, struct cplane *plane);
+
/* Special-case frustum clipper (might be slightly faster) */
int clip_frustum(struct g3d_vertex *vout, int *voutnum,
const struct g3d_vertex *vin, int vnum, int fplane);
static struct pimage tex;
-static int use_bsp = 1;
+static int use_bsp = 0;
#define LOWRES_SCALE 10
static uint16_t *lowres_pixels;
torus.varr[i].v *= 2.0;
}
+ /*
init_bsp(&torus_bsp);
if(bsp_add_mesh(&torus_bsp, &torus) == -1) {
fprintf(stderr, "failed to construct torus BSP tree\n");
return -1;
}
+ */
gen_texture(&tex, 128, 128);
free(cube.varr);
free(torus.varr);
free(torus.iarr);
+ /*
destroy_bsp(&torus_bsp);
+ */
}
static void start(long trans_time)