diff options
Diffstat (limited to 'source/blender/blenlib/BLI_polyfill_2d.h')
| -rw-r--r-- | source/blender/blenlib/BLI_polyfill_2d.h | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/source/blender/blenlib/BLI_polyfill_2d.h b/source/blender/blenlib/BLI_polyfill_2d.h index ca63ea5af87..25a624ba005 100644 --- a/source/blender/blenlib/BLI_polyfill_2d.h +++ b/source/blender/blenlib/BLI_polyfill_2d.h @@ -26,16 +26,32 @@ extern "C" { struct MemArena; +/** + * A version of #BLI_polyfill_calc that uses a memory arena to avoid re-allocations. + */ void BLI_polyfill_calc_arena(const float (*coords)[2], - const unsigned int coords_tot, - const int coords_sign, + unsigned int coords_tot, + int coords_sign, unsigned int (*r_tris)[3], struct MemArena *arena); +/** + * Triangulates the given (convex or concave) simple polygon to a list of triangle vertices. + * + * \param coords: 2D coordinates describing vertices of the polygon, + * in either clockwise or counterclockwise order. + * \param coords_tot: Total points in the array. + * \param coords_sign: Pass this when we know the sign in advance to avoid extra calculations. + * + * \param r_tris: This array is filled in with triangle indices in clockwise order. + * The length of the array must be `coords_tot - 2`. + * Indices are guaranteed to be assigned to unique triangles, with valid indices, + * even in the case of degenerate input (self intersecting polygons, zero area ears... etc). + */ void BLI_polyfill_calc(const float (*coords)[2], - const unsigned int coords_tot, - const int coords_sign, + unsigned int coords_tot, + int coords_sign, unsigned int (*r_tris)[3]); /* default size of polyfill arena */ |