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tornavis/source/blender/blenkernel/intern/multires_reshape_smooth.c

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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup bke
*/
#include "multires_reshape.h"
#include "MEM_guardedalloc.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "BLI_bitmap.h"
#include "BLI_math_vector.h"
#include "BLI_task.h"
#include "BLI_utildefines.h"
#include "BKE_customdata.h"
#include "BKE_multires.h"
#include "BKE_subdiv.h"
#include "BKE_subdiv_eval.h"
#include "BKE_subdiv_foreach.h"
#include "BKE_subdiv_mesh.h"
#include "opensubdiv_converter_capi.h"
#include "opensubdiv_evaluator_capi.h"
#include "opensubdiv_topology_refiner_capi.h"
#include "atomic_ops.h"
#include "subdiv_converter.h"
/* -------------------------------------------------------------------- */
/** \name Local Structs
* \{ */
/* Surface refers to a simplified and lower-memory footprint representation of the limit surface.
*
* Used to store pre-calculated information which is expensive or impossible to evaluate when
* traversing the final limit surface. */
typedef struct SurfacePoint {
float P[3];
float tangent_matrix[3][3];
} SurfacePoint;
typedef struct SurfaceGrid {
SurfacePoint *points;
} SurfaceGrid;
/* Geometry elements which are used to simplify creation of topology refiner at the sculpt level.
* Contains a limited subset of information needed to construct topology refiner. */
typedef struct Vertex {
/* All grid coordinates which the vertex corresponding to.
* For a vertices which are created from inner points of grids there is always one coordinate. */
int num_grid_coords;
GridCoord *grid_coords;
bool is_infinite_sharp;
} Vertex;
typedef struct Corner {
const Vertex *vertex;
int grid_index;
} Corner;
typedef struct Face {
int start_corner_index;
int num_corners;
} Face;
typedef struct Edge {
int v1;
int v2;
float sharpness;
} Edge;
/* Storage of data which is linearly interpolated from the reshape level to the top level. */
typedef struct LinearGridElement {
float mask;
} LinearGridElement;
typedef struct LinearGrid {
LinearGridElement *elements;
} LinearGrid;
typedef struct LinearGrids {
int num_grids;
int level;
/* Cached size for the grid, for faster lookup. */
int grid_size;
/* Indexed by grid index. */
LinearGrid *grids;
/* Elements for all grids are allocated in a single array, for the allocation performance. */
LinearGridElement *elements_storage;
} LinearGrids;
/* Context which holds all information eeded during propagation and smoothing. */
typedef struct MultiresReshapeSmoothContext {
const MultiresReshapeContext *reshape_context;
/* Geometry at a reshape multires level. */
struct {
int num_vertices;
Vertex *vertices;
/* Maximum number of edges which might be stored in the edges array.
* Is calculated based on the number of edges in the base mesh and the subdivision level. */
int max_edges;
/* Sparse storage of edges. Will only include edges which have non-zero sharpness.
*
* NOTE: Different type from others to be able to easier use atomic ops. */
size_t num_edges;
Edge *edges;
int num_corners;
Corner *corners;
int num_faces;
Face *faces;
} geometry;
/* Grids of data which is linearly interpolated between grid elements at the reshape level.
* The data is actually stored as a delta, which is then to be added to the higher levels. */
LinearGrids linear_delta_grids;
/* Index i of this map indicates that base edge i is adjacent to at least one face. */
BLI_bitmap *non_loose_base_edge_map;
/* Subdivision surface created for geometry at a reshape level. */
Subdiv *reshape_subdiv;
/* Limit surface of the base mesh with original sculpt level details on it, subdivided up to the
* top level.
* Is used as a base point to calculate how much displacement has been made in the sculpt mode.
*
* NOTE: Referring to sculpt as it is the main user of this functionality and it is clear to
* understand what it actually means in a concrete example. This is a generic code which is also
* used by Subdivide operation, but the idea is exactly the same as propagation in the sculpt
* mode. */
SurfaceGrid *base_surface_grids;
/* Defines how displacement is interpolated on the higher levels (for example, whether
* displacement is smoothed in Catmull-Clark mode or interpolated linearly preserving sharp edges
* of the current sculpt level).
*
* NOTE: Uses same enumerator type as Subdivide operator, since the values are the same and
* decoupling type just adds extra headache to convert one enumerator to another. */
eMultiresSubdivideModeType smoothing_type;
} MultiresReshapeSmoothContext;
/** \} */
/* -------------------------------------------------------------------- */
/** \name Linear grids manipulation
* \{ */
static void linear_grids_init(LinearGrids *linear_grids)
{
linear_grids->num_grids = 0;
linear_grids->level = 0;
linear_grids->grids = NULL;
linear_grids->elements_storage = NULL;
}
static void linear_grids_allocate(LinearGrids *linear_grids, int num_grids, int level)
{
const size_t grid_size = BKE_subdiv_grid_size_from_level(level);
const size_t grid_area = grid_size * grid_size;
const size_t num_grid_elements = num_grids * grid_area;
linear_grids->num_grids = num_grids;
linear_grids->level = level;
linear_grids->grid_size = grid_size;
linear_grids->grids = MEM_malloc_arrayN(num_grids, sizeof(LinearGrid), "linear grids");
linear_grids->elements_storage = MEM_calloc_arrayN(
num_grid_elements, sizeof(LinearGridElement), "linear elements storage");
for (int i = 0; i < num_grids; ++i) {
const size_t element_offset = grid_area * i;
linear_grids->grids[i].elements = &linear_grids->elements_storage[element_offset];
}
}
static LinearGridElement *linear_grid_element_get(const LinearGrids *linear_grids,
const GridCoord *grid_coord)
{
BLI_assert(grid_coord->grid_index >= 0);
BLI_assert(grid_coord->grid_index < linear_grids->num_grids);
const int grid_size = linear_grids->grid_size;
const int grid_x = lround(grid_coord->u * (grid_size - 1));
const int grid_y = lround(grid_coord->v * (grid_size - 1));
const int grid_element_index = grid_y * grid_size + grid_x;
LinearGrid *grid = &linear_grids->grids[grid_coord->grid_index];
return &grid->elements[grid_element_index];
}
static void linear_grids_free(LinearGrids *linear_grids)
{
MEM_SAFE_FREE(linear_grids->grids);
MEM_SAFE_FREE(linear_grids->elements_storage);
}
static void linear_grid_element_init(LinearGridElement *linear_grid_element)
{
linear_grid_element->mask = 0.0f;
}
/* result = a - b. */
static void linear_grid_element_sub(LinearGridElement *result,
const LinearGridElement *a,
const LinearGridElement *b)
{
result->mask = a->mask - b->mask;
}
static void linear_grid_element_interpolate(LinearGridElement *result,
const LinearGridElement elements[4],
const float weights[4])
{
result->mask = elements[0].mask * weights[0] + elements[1].mask * weights[1] +
elements[2].mask * weights[2] + elements[3].mask * weights[3];
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Surface
* \{ */
static void base_surface_grids_allocate(MultiresReshapeSmoothContext *reshape_smooth_context)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int num_grids = reshape_context->num_grids;
const int grid_size = reshape_context->top.grid_size;
const int grid_area = grid_size * grid_size;
SurfaceGrid *surface_grid = MEM_malloc_arrayN(num_grids, sizeof(SurfaceGrid), "delta grids");
for (int grid_index = 0; grid_index < num_grids; ++grid_index) {
surface_grid[grid_index].points = MEM_calloc_arrayN(
grid_area, sizeof(SurfacePoint), "delta grid displacement");
}
reshape_smooth_context->base_surface_grids = surface_grid;
}
static void base_surface_grids_free(MultiresReshapeSmoothContext *reshape_smooth_context)
{
if (reshape_smooth_context->base_surface_grids == NULL) {
return;
}
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int num_grids = reshape_context->num_grids;
for (int grid_index = 0; grid_index < num_grids; ++grid_index) {
MEM_freeN(reshape_smooth_context->base_surface_grids[grid_index].points);
}
MEM_freeN(reshape_smooth_context->base_surface_grids);
}
static SurfacePoint *base_surface_grids_read(
const MultiresReshapeSmoothContext *reshape_smooth_context, const GridCoord *grid_coord)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int grid_index = grid_coord->grid_index;
const int grid_size = reshape_context->top.grid_size;
const int grid_x = lround(grid_coord->u * (grid_size - 1));
const int grid_y = lround(grid_coord->v * (grid_size - 1));
const int grid_element_index = grid_y * grid_size + grid_x;
SurfaceGrid *surface_grid = &reshape_smooth_context->base_surface_grids[grid_index];
return &surface_grid->points[grid_element_index];
}
static void base_surface_grids_write(const MultiresReshapeSmoothContext *reshape_smooth_context,
const GridCoord *grid_coord,
float P[3],
float tangent_matrix[3][3])
{
SurfacePoint *point = base_surface_grids_read(reshape_smooth_context, grid_coord);
copy_v3_v3(point->P, P);
copy_m3_m3(point->tangent_matrix, tangent_matrix);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Evaluation of subdivision surface at a reshape level
* \{ */
typedef void (*ForeachTopLevelGridCoordCallback)(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *ptex_coord,
const GridCoord *grid_coord,
void *userdata_v);
typedef struct ForeachTopLevelGridCoordTaskData {
const MultiresReshapeSmoothContext *reshape_smooth_context;
int inner_grid_size;
float inner_grid_size_1_inv;
ForeachTopLevelGridCoordCallback callback;
void *callback_userdata_v;
} ForeachHighLevelCoordTaskData;
/* Find grid index which given face was created for. */
static int get_face_grid_index(const MultiresReshapeSmoothContext *reshape_smooth_context,
const Face *face)
{
const Corner *first_corner = &reshape_smooth_context->geometry.corners[face->start_corner_index];
const int grid_index = first_corner->grid_index;
#ifndef NDEBUG
for (int face_corner = 0; face_corner < face->num_corners; ++face_corner) {
const int corner_index = face->start_corner_index + face_corner;
const Corner *corner = &reshape_smooth_context->geometry.corners[corner_index];
BLI_assert(corner->grid_index == grid_index);
}
#endif
return grid_index;
}
static GridCoord *vertex_grid_coord_with_grid_index(const Vertex *vertex, const int grid_index)
{
for (int i = 0; i < vertex->num_grid_coords; ++i) {
if (vertex->grid_coords[i].grid_index == grid_index) {
return &vertex->grid_coords[i];
}
}
return NULL;
}
/* Get grid coordinates which correspond to corners of the given face.
* All the grid coordinates will be from the same grid index. */
static void grid_coords_from_face_vertices(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const Face *face,
const GridCoord *grid_coords[])
{
BLI_assert(face->num_corners == 4);
const int grid_index = get_face_grid_index(reshape_smooth_context, face);
BLI_assert(grid_index != -1);
for (int i = 0; i < face->num_corners; ++i) {
const int corner_index = face->start_corner_index + i;
const Corner *corner = &reshape_smooth_context->geometry.corners[corner_index];
grid_coords[i] = vertex_grid_coord_with_grid_index(corner->vertex, grid_index);
BLI_assert(grid_coords[i] != NULL);
}
}
static float lerp(float t, float a, float b)
{
return (a + t * (b - a));
}
static void interpolate_grid_coord(GridCoord *result,
const GridCoord *face_grid_coords[4],
const float u,
const float v)
{
/*
* v
* ^
* | (3) -------- (2)
* | | |
* | | |
* | | |
* | | |
* | (0) -------- (1)
* *--------------------------> u
*/
const float u01 = lerp(u, face_grid_coords[0]->u, face_grid_coords[1]->u);
const float u32 = lerp(u, face_grid_coords[3]->u, face_grid_coords[2]->u);
const float v03 = lerp(v, face_grid_coords[0]->v, face_grid_coords[3]->v);
const float v12 = lerp(v, face_grid_coords[1]->v, face_grid_coords[2]->v);
result->grid_index = face_grid_coords[0]->grid_index;
result->u = lerp(v, u01, u32);
result->v = lerp(u, v03, v12);
}
static void foreach_toplevel_grid_coord_task(void *__restrict userdata_v,
const int face_index,
const TaskParallelTLS *__restrict UNUSED(tls))
{
ForeachHighLevelCoordTaskData *data = userdata_v;
const MultiresReshapeSmoothContext *reshape_smooth_context = data->reshape_smooth_context;
const int inner_grid_size = data->inner_grid_size;
const float inner_grid_size_1_inv = data->inner_grid_size_1_inv;
const Face *face = &reshape_smooth_context->geometry.faces[face_index];
const GridCoord *face_grid_coords[4];
grid_coords_from_face_vertices(reshape_smooth_context, face, face_grid_coords);
for (int y = 0; y < inner_grid_size; ++y) {
const float ptex_v = (float)y * inner_grid_size_1_inv;
for (int x = 0; x < inner_grid_size; ++x) {
const float ptex_u = (float)x * inner_grid_size_1_inv;
PTexCoord ptex_coord;
ptex_coord.ptex_face_index = face_index;
ptex_coord.u = ptex_u;
ptex_coord.v = ptex_v;
GridCoord grid_coord;
interpolate_grid_coord(&grid_coord, face_grid_coords, ptex_u, ptex_v);
data->callback(reshape_smooth_context, &ptex_coord, &grid_coord, data->callback_userdata_v);
}
}
}
static void foreach_toplevel_grid_coord(const MultiresReshapeSmoothContext *reshape_smooth_context,
ForeachTopLevelGridCoordCallback callback,
void *callback_userdata_v)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int level_difference = (reshape_context->top.level - reshape_context->reshape.level);
ForeachHighLevelCoordTaskData data;
data.reshape_smooth_context = reshape_smooth_context;
data.inner_grid_size = (1 << level_difference) + 1;
data.inner_grid_size_1_inv = 1.0f / (float)(data.inner_grid_size - 1);
data.callback = callback;
data.callback_userdata_v = callback_userdata_v;
TaskParallelSettings parallel_range_settings;
BLI_parallel_range_settings_defaults(&parallel_range_settings);
parallel_range_settings.min_iter_per_thread = 1;
const int num_faces = reshape_smooth_context->geometry.num_faces;
BLI_task_parallel_range(
0, num_faces, &data, foreach_toplevel_grid_coord_task, &parallel_range_settings);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Generation of a topology information for OpenSubdiv converter
*
* Calculates vertices, their coordinates in the original grids, and connections of them so then
* it's easy to create OpenSubdiv's topology refiner.
* \{ */
static int get_reshape_level_resolution(const MultiresReshapeContext *reshape_context)
{
return (1 << reshape_context->reshape.level) + 1;
}
/* Get crease which will be used for communication to OpenSubdiv topology.
* Note that simple subdivision treats all base edges as infinitely sharp. */
static char get_effective_edge_crease_char(
const MultiresReshapeSmoothContext *reshape_smooth_context, const MEdge *base_edge)
{
if (ELEM(reshape_smooth_context->smoothing_type,
MULTIRES_SUBDIVIDE_LINEAR,
MULTIRES_SUBDIVIDE_SIMPLE)) {
return 255;
}
return base_edge->crease;
}
static void context_init(MultiresReshapeSmoothContext *reshape_smooth_context,
const MultiresReshapeContext *reshape_context,
const eMultiresSubdivideModeType mode)
{
reshape_smooth_context->reshape_context = reshape_context;
reshape_smooth_context->geometry.num_vertices = 0;
reshape_smooth_context->geometry.vertices = NULL;
reshape_smooth_context->geometry.max_edges = 0;
reshape_smooth_context->geometry.num_edges = 0;
reshape_smooth_context->geometry.edges = NULL;
reshape_smooth_context->geometry.num_corners = 0;
reshape_smooth_context->geometry.corners = NULL;
reshape_smooth_context->geometry.num_faces = 0;
reshape_smooth_context->geometry.faces = NULL;
linear_grids_init(&reshape_smooth_context->linear_delta_grids);
reshape_smooth_context->non_loose_base_edge_map = NULL;
reshape_smooth_context->reshape_subdiv = NULL;
reshape_smooth_context->base_surface_grids = NULL;
reshape_smooth_context->smoothing_type = mode;
}
static void context_free_geometry(MultiresReshapeSmoothContext *reshape_smooth_context)
{
if (reshape_smooth_context->geometry.vertices != NULL) {
for (int i = 0; i < reshape_smooth_context->geometry.num_vertices; ++i) {
MEM_SAFE_FREE(reshape_smooth_context->geometry.vertices[i].grid_coords);
}
}
MEM_SAFE_FREE(reshape_smooth_context->geometry.vertices);
MEM_SAFE_FREE(reshape_smooth_context->geometry.corners);
MEM_SAFE_FREE(reshape_smooth_context->geometry.faces);
MEM_SAFE_FREE(reshape_smooth_context->geometry.edges);
linear_grids_free(&reshape_smooth_context->linear_delta_grids);
}
static void context_free_subdiv(MultiresReshapeSmoothContext *reshape_smooth_context)
{
if (reshape_smooth_context->reshape_subdiv == NULL) {
return;
}
BKE_subdiv_free(reshape_smooth_context->reshape_subdiv);
}
static void context_free(MultiresReshapeSmoothContext *reshape_smooth_context)
{
MEM_freeN(reshape_smooth_context->non_loose_base_edge_map);
context_free_geometry(reshape_smooth_context);
context_free_subdiv(reshape_smooth_context);
base_surface_grids_free(reshape_smooth_context);
}
static bool foreach_topology_info(const SubdivForeachContext *foreach_context,
const int num_vertices,
const int num_edges,
const int num_loops,
const int num_polygons,
const int *UNUSED(subdiv_polygon_offset))
{
MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
const int max_edges = reshape_smooth_context->smoothing_type == MULTIRES_SUBDIVIDE_LINEAR ?
num_edges :
reshape_smooth_context->geometry.max_edges;
/* NOTE: Calloc so the counters are re-set to 0 "for free". */
reshape_smooth_context->geometry.num_vertices = num_vertices;
reshape_smooth_context->geometry.vertices = MEM_calloc_arrayN(
num_vertices, sizeof(Vertex), "smooth vertices");
reshape_smooth_context->geometry.max_edges = max_edges;
reshape_smooth_context->geometry.edges = MEM_malloc_arrayN(
max_edges, sizeof(Edge), "smooth edges");
reshape_smooth_context->geometry.num_corners = num_loops;
reshape_smooth_context->geometry.corners = MEM_malloc_arrayN(
num_loops, sizeof(Corner), "smooth corners");
reshape_smooth_context->geometry.num_faces = num_polygons;
reshape_smooth_context->geometry.faces = MEM_malloc_arrayN(
num_polygons, sizeof(Face), "smooth faces");
return true;
}
static void foreach_single_vertex(const SubdivForeachContext *foreach_context,
const GridCoord *grid_coord,
const int subdiv_vertex_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
BLI_assert(subdiv_vertex_index < reshape_smooth_context->geometry.num_vertices);
Vertex *vertex = &reshape_smooth_context->geometry.vertices[subdiv_vertex_index];
vertex->grid_coords = MEM_reallocN(vertex->grid_coords,
sizeof(Vertex) * (vertex->num_grid_coords + 1));
vertex->grid_coords[vertex->num_grid_coords] = *grid_coord;
++vertex->num_grid_coords;
}
/* TODO(sergey): De-duplicate with similar function in multires_reshape_vertcos.c */
static void foreach_vertex(const SubdivForeachContext *foreach_context,
const PTexCoord *ptex_coord,
const int subdiv_vertex_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const GridCoord grid_coord = multires_reshape_ptex_coord_to_grid(reshape_context, ptex_coord);
const int face_index = multires_reshape_grid_to_face_index(reshape_context,
grid_coord.grid_index);
const Mesh *base_mesh = reshape_context->base_mesh;
const MPoly *base_poly = &base_mesh->mpoly[face_index];
const int num_corners = base_poly->totloop;
const int start_grid_index = reshape_context->face_start_grid_index[face_index];
const int corner = grid_coord.grid_index - start_grid_index;
if (grid_coord.u == 0.0f && grid_coord.v == 0.0f) {
for (int current_corner = 0; current_corner < num_corners; ++current_corner) {
GridCoord corner_grid_coord = grid_coord;
corner_grid_coord.grid_index = start_grid_index + current_corner;
foreach_single_vertex(foreach_context, &corner_grid_coord, subdiv_vertex_index);
}
return;
}
foreach_single_vertex(foreach_context, &grid_coord, subdiv_vertex_index);
if (grid_coord.u == 0.0f) {
GridCoord prev_grid_coord;
prev_grid_coord.grid_index = start_grid_index + ((corner + num_corners - 1) % num_corners);
prev_grid_coord.u = grid_coord.v;
prev_grid_coord.v = 0.0f;
foreach_single_vertex(foreach_context, &prev_grid_coord, subdiv_vertex_index);
}
if (grid_coord.v == 0.0f) {
GridCoord next_grid_coord;
next_grid_coord.grid_index = start_grid_index + ((corner + 1) % num_corners);
next_grid_coord.u = 0.0f;
next_grid_coord.v = grid_coord.u;
foreach_single_vertex(foreach_context, &next_grid_coord, subdiv_vertex_index);
}
}
static void foreach_vertex_inner(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls),
const int ptex_face_index,
const float ptex_face_u,
const float ptex_face_v,
const int UNUSED(coarse_poly_index),
const int UNUSED(coarse_corner),
const int subdiv_vertex_index)
{
const PTexCoord ptex_coord = {
.ptex_face_index = ptex_face_index,
.u = ptex_face_u,
.v = ptex_face_v,
};
foreach_vertex(foreach_context, &ptex_coord, subdiv_vertex_index);
}
static void foreach_vertex_every_corner(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls_v),
const int ptex_face_index,
const float ptex_face_u,
const float ptex_face_v,
const int UNUSED(coarse_vertex_index),
const int UNUSED(coarse_face_index),
const int UNUSED(coarse_face_corner),
const int subdiv_vertex_index)
{
const PTexCoord ptex_coord = {
.ptex_face_index = ptex_face_index,
.u = ptex_face_u,
.v = ptex_face_v,
};
foreach_vertex(foreach_context, &ptex_coord, subdiv_vertex_index);
}
static void foreach_vertex_every_edge(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls_v),
const int ptex_face_index,
const float ptex_face_u,
const float ptex_face_v,
const int UNUSED(coarse_edge_index),
const int UNUSED(coarse_face_index),
const int UNUSED(coarse_face_corner),
const int subdiv_vertex_index)
{
const PTexCoord ptex_coord = {
.ptex_face_index = ptex_face_index,
.u = ptex_face_u,
.v = ptex_face_v,
};
foreach_vertex(foreach_context, &ptex_coord, subdiv_vertex_index);
}
static void foreach_loop(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls),
const int UNUSED(ptex_face_index),
const float UNUSED(ptex_face_u),
const float UNUSED(ptex_face_v),
const int UNUSED(coarse_loop_index),
const int coarse_poly_index,
const int coarse_corner,
const int subdiv_loop_index,
const int subdiv_vertex_index,
const int UNUSED(subdiv_edge_index))
{
MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
BLI_assert(subdiv_loop_index < reshape_smooth_context->geometry.num_corners);
Corner *corner = &reshape_smooth_context->geometry.corners[subdiv_loop_index];
corner->vertex = &reshape_smooth_context->geometry.vertices[subdiv_vertex_index];
const int first_grid_index = reshape_context->face_start_grid_index[coarse_poly_index];
corner->grid_index = first_grid_index + coarse_corner;
}
static void foreach_poly(const SubdivForeachContext *foreach_context,
void *UNUSED(tls),
const int UNUSED(coarse_poly_index),
const int subdiv_poly_index,
const int start_loop_index,
const int num_loops)
{
MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
BLI_assert(subdiv_poly_index < reshape_smooth_context->geometry.num_faces);
Face *face = &reshape_smooth_context->geometry.faces[subdiv_poly_index];
face->start_corner_index = start_loop_index;
face->num_corners = num_loops;
}
static void foreach_vertex_of_loose_edge(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls),
const int UNUSED(coarse_edge_index),
const float UNUSED(u),
const int vertex_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
Vertex *vertex = &reshape_smooth_context->geometry.vertices[vertex_index];
if (vertex->num_grid_coords != 0) {
vertex->is_infinite_sharp = true;
}
}
static void store_edge(MultiresReshapeSmoothContext *reshape_smooth_context,
const int subdiv_v1,
const int subdiv_v2,
const char crease)
{
/* This is a bit overhead to use atomics in such a simple function called from many threads,
* but this allows to save quite measurable amount of memory. */
const int edge_index = atomic_fetch_and_add_z(&reshape_smooth_context->geometry.num_edges, 1);
BLI_assert(edge_index < reshape_smooth_context->geometry.max_edges);
Edge *edge = &reshape_smooth_context->geometry.edges[edge_index];
edge->v1 = subdiv_v1;
edge->v2 = subdiv_v2;
edge->sharpness = BKE_subdiv_edge_crease_to_sharpness_char(crease);
}
static void foreach_edge(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls),
const int coarse_edge_index,
const int UNUSED(subdiv_edge_index),
const int subdiv_v1,
const int subdiv_v2)
{
MultiresReshapeSmoothContext *reshape_smooth_context = foreach_context->user_data;
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
if (reshape_smooth_context->smoothing_type == MULTIRES_SUBDIVIDE_LINEAR) {
store_edge(reshape_smooth_context, subdiv_v1, subdiv_v2, (char)255);
return;
}
/* Ignore all inner face edges as they have sharpness of zero when using Catmull-Clark mode. In
* simple mode, all edges have maximum sharpness, so they can't be skipped. */
if (coarse_edge_index == ORIGINDEX_NONE &&
reshape_smooth_context->smoothing_type != MULTIRES_SUBDIVIDE_SIMPLE) {
return;
}
/* Ignore all loose edges as well, as they are not communicated to the OpenSubdiv. */
if (!BLI_BITMAP_TEST_BOOL(reshape_smooth_context->non_loose_base_edge_map, coarse_edge_index)) {
return;
}
/* Edges without crease are to be ignored as well. */
const Mesh *base_mesh = reshape_context->base_mesh;
const MEdge *base_edge = &base_mesh->medge[coarse_edge_index];
const char crease = get_effective_edge_crease_char(reshape_smooth_context, base_edge);
if (crease == 0) {
return;
}
store_edge(reshape_smooth_context, subdiv_v1, subdiv_v2, crease);
}
static void geometry_init_loose_information(MultiresReshapeSmoothContext *reshape_smooth_context)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const Mesh *base_mesh = reshape_context->base_mesh;
const MPoly *base_mpoly = base_mesh->mpoly;
const MLoop *base_mloop = base_mesh->mloop;
const MEdge *base_edge = base_mesh->medge;
reshape_smooth_context->non_loose_base_edge_map = BLI_BITMAP_NEW(base_mesh->totedge,
"non_loose_base_edge_map");
int num_used_edges = 0;
for (int poly_index = 0; poly_index < base_mesh->totpoly; ++poly_index) {
const MPoly *base_poly = &base_mpoly[poly_index];
for (int corner = 0; corner < base_poly->totloop; corner++) {
const MLoop *loop = &base_mloop[base_poly->loopstart + corner];
if (!BLI_BITMAP_TEST_BOOL(reshape_smooth_context->non_loose_base_edge_map, loop->e)) {
BLI_BITMAP_ENABLE(reshape_smooth_context->non_loose_base_edge_map, loop->e);
const char crease = get_effective_edge_crease_char(reshape_smooth_context,
&base_edge[loop->e]);
if (crease != 0) {
++num_used_edges;
}
}
}
}
const int resolution = get_reshape_level_resolution(reshape_context);
const int num_subdiv_vertices_per_base_edge = resolution - 2;
reshape_smooth_context->geometry.max_edges = num_used_edges *
(num_subdiv_vertices_per_base_edge + 1);
}
static void geometry_create(MultiresReshapeSmoothContext *reshape_smooth_context)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
SubdivForeachContext foreach_context = {
.topology_info = foreach_topology_info,
.vertex_inner = foreach_vertex_inner,
.vertex_every_corner = foreach_vertex_every_corner,
.vertex_every_edge = foreach_vertex_every_edge,
.loop = foreach_loop,
.poly = foreach_poly,
.vertex_of_loose_edge = foreach_vertex_of_loose_edge,
.edge = foreach_edge,
.user_data = reshape_smooth_context,
};
geometry_init_loose_information(reshape_smooth_context);
SubdivToMeshSettings mesh_settings;
mesh_settings.resolution = get_reshape_level_resolution(reshape_context);
mesh_settings.use_optimal_display = false;
/* TODO(sergey): Tell the foreach() to ignore loose vertices. */
BKE_subdiv_foreach_subdiv_geometry(
reshape_context->subdiv, &foreach_context, &mesh_settings, reshape_context->base_mesh);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Generation of OpenSubdiv evaluator for topology created form reshape level
* \{ */
static OpenSubdiv_SchemeType get_scheme_type(const OpenSubdiv_Converter *UNUSED(converter))
{
return OSD_SCHEME_CATMARK;
}
static OpenSubdiv_VtxBoundaryInterpolation get_vtx_boundary_interpolation(
const struct OpenSubdiv_Converter *converter)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const SubdivSettings *settings = &reshape_context->subdiv->settings;
return BKE_subdiv_converter_vtx_boundary_interpolation_from_settings(settings);
}
static OpenSubdiv_FVarLinearInterpolation get_fvar_linear_interpolation(
const OpenSubdiv_Converter *converter)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const SubdivSettings *settings = &reshape_context->subdiv->settings;
return BKE_subdiv_converter_fvar_linear_from_settings(settings);
}
static bool specifies_full_topology(const OpenSubdiv_Converter *UNUSED(converter))
{
return false;
}
static int get_num_faces(const OpenSubdiv_Converter *converter)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
return reshape_smooth_context->geometry.num_faces;
}
static int get_num_vertices(const OpenSubdiv_Converter *converter)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
return reshape_smooth_context->geometry.num_vertices;
}
static int get_num_face_vertices(const OpenSubdiv_Converter *converter, int face_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
BLI_assert(face_index < reshape_smooth_context->geometry.num_faces);
const Face *face = &reshape_smooth_context->geometry.faces[face_index];
return face->num_corners;
}
static void get_face_vertices(const OpenSubdiv_Converter *converter,
int face_index,
int *face_vertices)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
BLI_assert(face_index < reshape_smooth_context->geometry.num_faces);
const Face *face = &reshape_smooth_context->geometry.faces[face_index];
for (int i = 0; i < face->num_corners; ++i) {
const int corner_index = face->start_corner_index + i;
const Corner *corner = &reshape_smooth_context->geometry.corners[corner_index];
face_vertices[i] = corner->vertex - reshape_smooth_context->geometry.vertices;
}
}
static int get_num_edges(const struct OpenSubdiv_Converter *converter)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
return reshape_smooth_context->geometry.num_edges;
}
static void get_edge_vertices(const OpenSubdiv_Converter *converter,
const int edge_index,
int edge_vertices[2])
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
BLI_assert(edge_index < reshape_smooth_context->geometry.num_edges);
const Edge *edge = &reshape_smooth_context->geometry.edges[edge_index];
edge_vertices[0] = edge->v1;
edge_vertices[1] = edge->v2;
}
static float get_edge_sharpness(const OpenSubdiv_Converter *converter, const int edge_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
BLI_assert(edge_index < reshape_smooth_context->geometry.num_edges);
const Edge *edge = &reshape_smooth_context->geometry.edges[edge_index];
return edge->sharpness;
}
static bool is_infinite_sharp_vertex(const OpenSubdiv_Converter *converter, int vertex_index)
{
const MultiresReshapeSmoothContext *reshape_smooth_context = converter->user_data;
BLI_assert(vertex_index < reshape_smooth_context->geometry.num_vertices);
const Vertex *vertex = &reshape_smooth_context->geometry.vertices[vertex_index];
return vertex->is_infinite_sharp;
}
static void converter_init(const MultiresReshapeSmoothContext *reshape_smooth_context,
OpenSubdiv_Converter *converter)
{
converter->getSchemeType = get_scheme_type;
converter->getVtxBoundaryInterpolation = get_vtx_boundary_interpolation;
converter->getFVarLinearInterpolation = get_fvar_linear_interpolation;
converter->specifiesFullTopology = specifies_full_topology;
converter->getNumFaces = get_num_faces;
converter->getNumEdges = get_num_edges;
converter->getNumVertices = get_num_vertices;
converter->getNumFaceVertices = get_num_face_vertices;
converter->getFaceVertices = get_face_vertices;
converter->getFaceEdges = NULL;
converter->getEdgeVertices = get_edge_vertices;
converter->getNumEdgeFaces = NULL;
converter->getEdgeFaces = NULL;
converter->getEdgeSharpness = get_edge_sharpness;
converter->getNumVertexEdges = NULL;
converter->getVertexEdges = NULL;
converter->getNumVertexFaces = NULL;
converter->getVertexFaces = NULL;
converter->isInfiniteSharpVertex = is_infinite_sharp_vertex;
converter->getVertexSharpness = NULL;
converter->getNumUVLayers = NULL;
converter->precalcUVLayer = NULL;
converter->finishUVLayer = NULL;
converter->getNumUVCoordinates = NULL;
converter->getFaceCornerUVIndex = NULL;
converter->freeUserData = NULL;
converter->user_data = (void *)reshape_smooth_context;
}
/* Create subdiv descriptor created for topology at a reshape level. */
static void reshape_subdiv_create(MultiresReshapeSmoothContext *reshape_smooth_context)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const SubdivSettings *settings = &reshape_context->subdiv->settings;
OpenSubdiv_Converter converter;
converter_init(reshape_smooth_context, &converter);
Subdiv *reshape_subdiv = BKE_subdiv_new_from_converter(settings, &converter);
BKE_subdiv_eval_begin(reshape_subdiv, SUBDIV_EVALUATOR_TYPE_CPU, NULL);
reshape_smooth_context->reshape_subdiv = reshape_subdiv;
BKE_subdiv_converter_free(&converter);
}
/* Callback to provide coarse position for subdivision surface topology at a reshape level. */
typedef void(ReshapeSubdivCoarsePositionCb)(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const Vertex *vertex,
float r_P[3]);
/* Refine subdivision surface topology at a reshape level for new coarse vertices positions. */
static void reshape_subdiv_refine(const MultiresReshapeSmoothContext *reshape_smooth_context,
ReshapeSubdivCoarsePositionCb coarse_position_cb)
{
Subdiv *reshape_subdiv = reshape_smooth_context->reshape_subdiv;
/* TODO(sergey): For non-trivial coarse_position_cb we should multi-thread this loop. */
const int num_vertices = reshape_smooth_context->geometry.num_vertices;
for (int i = 0; i < num_vertices; ++i) {
const Vertex *vertex = &reshape_smooth_context->geometry.vertices[i];
float P[3];
coarse_position_cb(reshape_smooth_context, vertex, P);
reshape_subdiv->evaluator->setCoarsePositions(reshape_subdiv->evaluator, P, i, 1);
}
reshape_subdiv->evaluator->refine(reshape_subdiv->evaluator);
}
BLI_INLINE const GridCoord *reshape_subdiv_refine_vertex_grid_coord(const Vertex *vertex)
{
if (vertex->num_grid_coords == 0) {
/* This is a loose vertex, the coordinate is not important. */
/* TODO(sergey): Once the subdiv_foreach() supports properly ignoring loose elements this
* should become an assert instead. */
return NULL;
}
/* NOTE: All grid coordinates will point to the same object position, so can be simple and use
* first grid coordinate. */
return &vertex->grid_coords[0];
}
/* Version of reshape_subdiv_refine() which uses coarse position from original grids. */
static void reshape_subdiv_refine_orig_P(
const MultiresReshapeSmoothContext *reshape_smooth_context, const Vertex *vertex, float r_P[3])
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const GridCoord *grid_coord = reshape_subdiv_refine_vertex_grid_coord(vertex);
/* Check whether this is a loose vertex. */
if (grid_coord == NULL) {
zero_v3(r_P);
return;
}
float limit_P[3];
float tangent_matrix[3][3];
multires_reshape_evaluate_limit_at_grid(reshape_context, grid_coord, limit_P, tangent_matrix);
const ReshapeConstGridElement orig_grid_element =
multires_reshape_orig_grid_element_for_grid_coord(reshape_context, grid_coord);
float D[3];
mul_v3_m3v3(D, tangent_matrix, orig_grid_element.displacement);
add_v3_v3v3(r_P, limit_P, D);
}
static void reshape_subdiv_refine_orig(const MultiresReshapeSmoothContext *reshape_smooth_context)
{
reshape_subdiv_refine(reshape_smooth_context, reshape_subdiv_refine_orig_P);
}
/* Version of reshape_subdiv_refine() which uses coarse position from final grids. */
static void reshape_subdiv_refine_final_P(
const MultiresReshapeSmoothContext *reshape_smooth_context, const Vertex *vertex, float r_P[3])
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const GridCoord *grid_coord = reshape_subdiv_refine_vertex_grid_coord(vertex);
/* Check whether this is a loose vertex. */
if (grid_coord == NULL) {
zero_v3(r_P);
return;
}
const ReshapeGridElement grid_element = multires_reshape_grid_element_for_grid_coord(
reshape_context, grid_coord);
/* NOTE: At this point in reshape/propagate pipeline grid displacement is actually storing object
* vertices coordinates. */
copy_v3_v3(r_P, grid_element.displacement);
}
static void reshape_subdiv_refine_final(const MultiresReshapeSmoothContext *reshape_smooth_context)
{
reshape_subdiv_refine(reshape_smooth_context, reshape_subdiv_refine_final_P);
}
static void reshape_subdiv_evaluate_limit_at_grid(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *ptex_coord,
const GridCoord *grid_coord,
float limit_P[3],
float r_tangent_matrix[3][3])
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
float dPdu[3], dPdv[3];
BKE_subdiv_eval_limit_point_and_derivatives(reshape_smooth_context->reshape_subdiv,
ptex_coord->ptex_face_index,
ptex_coord->u,
ptex_coord->v,
limit_P,
dPdu,
dPdv);
const int face_index = multires_reshape_grid_to_face_index(reshape_context,
grid_coord->grid_index);
const int corner = multires_reshape_grid_to_corner(reshape_context, grid_coord->grid_index);
multires_reshape_tangent_matrix_for_corner(
reshape_context, face_index, corner, dPdu, dPdv, r_tangent_matrix);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Linearly interpolated data
* \{ */
static LinearGridElement linear_grid_element_orig_get(
const MultiresReshapeSmoothContext *reshape_smooth_context, const GridCoord *grid_coord)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const ReshapeConstGridElement orig_grid_element =
multires_reshape_orig_grid_element_for_grid_coord(reshape_context, grid_coord);
LinearGridElement linear_grid_element;
linear_grid_element_init(&linear_grid_element);
linear_grid_element.mask = orig_grid_element.mask;
return linear_grid_element;
}
static LinearGridElement linear_grid_element_final_get(
const MultiresReshapeSmoothContext *reshape_smooth_context, const GridCoord *grid_coord)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const ReshapeGridElement final_grid_element = multires_reshape_grid_element_for_grid_coord(
reshape_context, grid_coord);
LinearGridElement linear_grid_element;
linear_grid_element_init(&linear_grid_element);
if (final_grid_element.mask != NULL) {
linear_grid_element.mask = *final_grid_element.mask;
}
return linear_grid_element;
}
/* Interpolate difference of the linear data.
*
* Will access final data and original data at the grid elements at the reshape level,
* calculate difference between final and original, and linearly interpolate to get value at the
* top level. */
static void linear_grid_element_delta_interpolate(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const GridCoord *grid_coord,
LinearGridElement *result)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int reshape_level = reshape_context->reshape.level;
const int reshape_level_grid_size = BKE_subdiv_grid_size_from_level(reshape_level);
const int reshape_level_grid_size_1 = reshape_level_grid_size - 1;
const float reshape_level_grid_size_1_inv = 1.0f / (float)(reshape_level_grid_size_1);
const float x_f = grid_coord->u * reshape_level_grid_size_1;
const float y_f = grid_coord->v * reshape_level_grid_size_1;
const int x_i = x_f;
const int y_i = y_f;
const int x_n_i = (x_i == reshape_level_grid_size - 1) ? (x_i) : (x_i + 1);
const int y_n_i = (y_i == reshape_level_grid_size - 1) ? (y_i) : (y_i + 1);
const int corners_int_coords[4][2] = {{x_i, y_i}, {x_n_i, y_i}, {x_n_i, y_n_i}, {x_i, y_n_i}};
LinearGridElement corner_elements[4];
for (int i = 0; i < 4; ++i) {
GridCoord corner_grid_coord;
corner_grid_coord.grid_index = grid_coord->grid_index;
corner_grid_coord.u = corners_int_coords[i][0] * reshape_level_grid_size_1_inv;
corner_grid_coord.v = corners_int_coords[i][1] * reshape_level_grid_size_1_inv;
const LinearGridElement orig_element = linear_grid_element_orig_get(reshape_smooth_context,
&corner_grid_coord);
const LinearGridElement final_element = linear_grid_element_final_get(reshape_smooth_context,
&corner_grid_coord);
linear_grid_element_sub(&corner_elements[i], &final_element, &orig_element);
}
const float u = x_f - x_i;
const float v = y_f - y_i;
const float weights[4] = {(1.0f - u) * (1.0f - v), u * (1.0f - v), u * v, (1.0f - u) * v};
linear_grid_element_interpolate(result, corner_elements, weights);
}
static void evaluate_linear_delta_grids_callback(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *UNUSED(ptex_coord),
const GridCoord *grid_coord,
void *UNUSED(userdata_v))
{
LinearGridElement *linear_delta_element = linear_grid_element_get(
&reshape_smooth_context->linear_delta_grids, grid_coord);
linear_grid_element_delta_interpolate(reshape_smooth_context, grid_coord, linear_delta_element);
}
static void evaluate_linear_delta_grids(MultiresReshapeSmoothContext *reshape_smooth_context)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
const int num_grids = reshape_context->num_grids;
const int top_level = reshape_context->top.level;
linear_grids_allocate(&reshape_smooth_context->linear_delta_grids, num_grids, top_level);
foreach_toplevel_grid_coord(reshape_smooth_context, evaluate_linear_delta_grids_callback, NULL);
}
static void propagate_linear_data_delta(const MultiresReshapeSmoothContext *reshape_smooth_context,
ReshapeGridElement *final_grid_element,
const GridCoord *grid_coord)
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
LinearGridElement *linear_delta_element = linear_grid_element_get(
&reshape_smooth_context->linear_delta_grids, grid_coord);
const ReshapeConstGridElement orig_grid_element =
multires_reshape_orig_grid_element_for_grid_coord(reshape_context, grid_coord);
if (final_grid_element->mask != NULL) {
*final_grid_element->mask = clamp_f(
orig_grid_element.mask + linear_delta_element->mask, 0.0f, 1.0f);
}
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Evaluation of base surface
* \{ */
static void evaluate_base_surface_grids_callback(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *ptex_coord,
const GridCoord *grid_coord,
void *UNUSED(userdata_v))
{
float limit_P[3];
float tangent_matrix[3][3];
reshape_subdiv_evaluate_limit_at_grid(
reshape_smooth_context, ptex_coord, grid_coord, limit_P, tangent_matrix);
base_surface_grids_write(reshape_smooth_context, grid_coord, limit_P, tangent_matrix);
}
static void evaluate_base_surface_grids(const MultiresReshapeSmoothContext *reshape_smooth_context)
{
foreach_toplevel_grid_coord(reshape_smooth_context, evaluate_base_surface_grids_callback, NULL);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Evaluation of new surface
* \{ */
/* Evaluate final position of the original (pre-sculpt-edit) point position at a given grid
* coordinate. */
static void evaluate_final_original_point(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const GridCoord *grid_coord,
float r_orig_final_P[3])
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
/* Element of an original MDISPS grid) */
const ReshapeConstGridElement orig_grid_element =
multires_reshape_orig_grid_element_for_grid_coord(reshape_context, grid_coord);
/* Limit surface of the base mesh. */
float base_mesh_limit_P[3];
float base_mesh_tangent_matrix[3][3];
multires_reshape_evaluate_limit_at_grid(
reshape_context, grid_coord, base_mesh_limit_P, base_mesh_tangent_matrix);
/* Convert original displacement from tangent space to object space. */
float orig_displacement[3];
mul_v3_m3v3(orig_displacement, base_mesh_tangent_matrix, orig_grid_element.displacement);
/* Final point = limit surface + displacement. */
add_v3_v3v3(r_orig_final_P, base_mesh_limit_P, orig_displacement);
}
static void evaluate_higher_grid_positions_with_details_callback(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *ptex_coord,
const GridCoord *grid_coord,
void *UNUSED(userdata_v))
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
/* Position of the original vertex at top level. */
float orig_final_P[3];
evaluate_final_original_point(reshape_smooth_context, grid_coord, orig_final_P);
/* Original surface point on sculpt level (sculpt level before edits in sculpt mode). */
const SurfacePoint *orig_sculpt_point = base_surface_grids_read(reshape_smooth_context,
grid_coord);
/* Difference between original top level and original sculpt level in object space. */
float original_detail_delta[3];
sub_v3_v3v3(original_detail_delta, orig_final_P, orig_sculpt_point->P);
/* Difference between original top level and original sculpt level in tangent space of original
* sculpt level. */
float original_detail_delta_tangent[3];
float original_sculpt_tangent_matrix_inv[3][3];
invert_m3_m3(original_sculpt_tangent_matrix_inv, orig_sculpt_point->tangent_matrix);
mul_v3_m3v3(
original_detail_delta_tangent, original_sculpt_tangent_matrix_inv, original_detail_delta);
/* Limit surface of smoothed (subdivided) edited sculpt level. */
float smooth_limit_P[3];
float smooth_tangent_matrix[3][3];
reshape_subdiv_evaluate_limit_at_grid(
reshape_smooth_context, ptex_coord, grid_coord, smooth_limit_P, smooth_tangent_matrix);
/* Add original detail to the smoothed surface. */
float smooth_delta[3];
mul_v3_m3v3(smooth_delta, smooth_tangent_matrix, original_detail_delta_tangent);
/* Grid element of the result.
*
* NOTE: Displacement is storing object space coordinate. */
ReshapeGridElement grid_element = multires_reshape_grid_element_for_grid_coord(reshape_context,
grid_coord);
add_v3_v3v3(grid_element.displacement, smooth_limit_P, smooth_delta);
/* Propagate non-coordinate data. */
propagate_linear_data_delta(reshape_smooth_context, &grid_element, grid_coord);
}
static void evaluate_higher_grid_positions_with_details(
const MultiresReshapeSmoothContext *reshape_smooth_context)
{
foreach_toplevel_grid_coord(
reshape_smooth_context, evaluate_higher_grid_positions_with_details_callback, NULL);
}
static void evaluate_higher_grid_positions_callback(
const MultiresReshapeSmoothContext *reshape_smooth_context,
const PTexCoord *ptex_coord,
const GridCoord *grid_coord,
void *UNUSED(userdata_v))
{
const MultiresReshapeContext *reshape_context = reshape_smooth_context->reshape_context;
Subdiv *reshape_subdiv = reshape_smooth_context->reshape_subdiv;
ReshapeGridElement grid_element = multires_reshape_grid_element_for_grid_coord(reshape_context,
grid_coord);
/* Surface. */
float P[3];
BKE_subdiv_eval_limit_point(
reshape_subdiv, ptex_coord->ptex_face_index, ptex_coord->u, ptex_coord->v, P);
copy_v3_v3(grid_element.displacement, P);
/* Propagate non-coordinate data. */
propagate_linear_data_delta(reshape_smooth_context, &grid_element, grid_coord);
}
static void evaluate_higher_grid_positions(
const MultiresReshapeSmoothContext *reshape_smooth_context)
{
foreach_toplevel_grid_coord(
reshape_smooth_context, evaluate_higher_grid_positions_callback, NULL);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Entry point
* \{ */
void multires_reshape_smooth_object_grids_with_details(
const MultiresReshapeContext *reshape_context)
{
const int level_difference = (reshape_context->top.level - reshape_context->reshape.level);
if (level_difference == 0) {
/* Early output. */
return;
}
MultiresReshapeSmoothContext reshape_smooth_context;
if (reshape_context->subdiv->settings.is_simple) {
context_init(&reshape_smooth_context, reshape_context, MULTIRES_SUBDIVIDE_SIMPLE);
}
else {
context_init(&reshape_smooth_context, reshape_context, MULTIRES_SUBDIVIDE_CATMULL_CLARK);
}
geometry_create(&reshape_smooth_context);
evaluate_linear_delta_grids(&reshape_smooth_context);
reshape_subdiv_create(&reshape_smooth_context);
base_surface_grids_allocate(&reshape_smooth_context);
reshape_subdiv_refine_orig(&reshape_smooth_context);
evaluate_base_surface_grids(&reshape_smooth_context);
reshape_subdiv_refine_final(&reshape_smooth_context);
evaluate_higher_grid_positions_with_details(&reshape_smooth_context);
context_free(&reshape_smooth_context);
}
void multires_reshape_smooth_object_grids(const MultiresReshapeContext *reshape_context,
const eMultiresSubdivideModeType mode)
{
const int level_difference = (reshape_context->top.level - reshape_context->reshape.level);
if (level_difference == 0) {
/* Early output. */
return;
}
MultiresReshapeSmoothContext reshape_smooth_context;
context_init(&reshape_smooth_context, reshape_context, mode);
geometry_create(&reshape_smooth_context);
evaluate_linear_delta_grids(&reshape_smooth_context);
reshape_subdiv_create(&reshape_smooth_context);
reshape_subdiv_refine_final(&reshape_smooth_context);
evaluate_higher_grid_positions(&reshape_smooth_context);
context_free(&reshape_smooth_context);
}
/** \} */
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