diff options
Diffstat (limited to 'source/blender/blenkernel/intern/subdiv_ccg.c')
-rw-r--r-- | source/blender/blenkernel/intern/subdiv_ccg.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/subdiv_ccg.c b/source/blender/blenkernel/intern/subdiv_ccg.c index ea8bae4737a..0997b42a19f 100644 --- a/source/blender/blenkernel/intern/subdiv_ccg.c +++ b/source/blender/blenkernel/intern/subdiv_ccg.c @@ -1933,4 +1933,47 @@ void BKE_subdiv_ccg_grid_hidden_ensure(SubdivCCG *subdiv_ccg, int grid_index) subdiv_ccg->grid_hidden[grid_index] = BLI_BITMAP_NEW(key.grid_area, __func__); } +static void subdiv_ccg_coord_to_ptex_coord(const SubdivCCG *subdiv_ccg, + const SubdivCCGCoord *coord, + int *r_ptex_face_index, + float *r_u, + float *r_v) +{ + Subdiv *subdiv = subdiv_ccg->subdiv; + + const float grid_size = subdiv_ccg->grid_size; + const float grid_size_1_inv = 1.0f / (grid_size - 1); + + const float grid_u = coord->x * grid_size_1_inv; + const float grid_v = coord->y * grid_size_1_inv; + + const int face_index = BKE_subdiv_ccg_grid_to_face_index(subdiv_ccg, coord->grid_index); + const SubdivCCGFace *faces = subdiv_ccg->faces; + const SubdivCCGFace *face = &faces[face_index]; + const int *face_ptex_offset = BKE_subdiv_face_ptex_offset_get(subdiv); + *r_ptex_face_index = face_ptex_offset[face_index]; + + const float corner = coord->grid_index - face->start_grid_index; + + if (face->num_grids == 4) { + BKE_subdiv_rotate_grid_to_quad(corner, grid_u, grid_v, r_u, r_v); + } + else { + *r_ptex_face_index += corner; + *r_u = 1.0f - grid_v; + *r_v = 1.0f - grid_u; + } +} + +void BKE_subdiv_ccg_eval_limit_point(const SubdivCCG *subdiv_ccg, + const SubdivCCGCoord *coord, + float r_point[3]) +{ + Subdiv *subdiv = subdiv_ccg->subdiv; + int ptex_face_index; + float u, v; + subdiv_ccg_coord_to_ptex_coord(subdiv_ccg, coord, &ptex_face_index, &u, &v); + BKE_subdiv_eval_limit_point(subdiv, ptex_face_index, u, v, r_point); +} + /** \} */ |