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a8ce9a143abbb51eae28e5d0cae1fb310bd0c24c
blender-archive/source/blender/blenkernel/intern/multires_reshape.c
Sergey Sharybin 8a7085b9d4 Fix T70163: Error painting with Subdivision at end of stack 
Deformation of subdivision surface modifier was using wrong coordinates
for the coarse mesh: as the modifier flow goes the coordinates are to be
taken from the input array of coordinates.
2019-09-26 12:01:52 +02:00

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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) 2018 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup bke
*/
#include "MEM_guardedalloc.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_scene_types.h"
#include "BLI_utildefines.h"
#include "BLI_math_vector.h"
#include "BLI_task.h"
#include "BKE_ccg.h"
#include "BKE_library.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_modifier.h"
#include "BKE_multires.h"
#include "BKE_subdiv.h"
#include "BKE_subdiv_ccg.h"
#include "BKE_subdiv_eval.h"
#include "BKE_subdiv_foreach.h"
#include "BKE_subdiv_mesh.h"
#include "DEG_depsgraph_query.h"
static void multires_reshape_init_mmd(MultiresModifierData *reshape_mmd,
const MultiresModifierData *mmd)
{
*reshape_mmd = *mmd;
}
static void multires_reshape_init_mmd_top_level(MultiresModifierData *reshape_mmd,
const MultiresModifierData *mmd)
{
*reshape_mmd = *mmd;
reshape_mmd->lvl = reshape_mmd->totlvl;
}
/* =============================================================================
* General reshape implementation, reused by all particular cases.
*/
typedef struct MultiresReshapeContext {
Subdiv *subdiv;
const Mesh *coarse_mesh;
MDisps *mdisps;
GridPaintMask *grid_paint_mask;
int top_grid_size;
int top_level;
/* Indexed by coarse face index, returns first ptex face index corresponding
* to that coarse face. */
int *face_ptex_offset;
} MultiresReshapeContext;
static void multires_reshape_allocate_displacement_grid(MDisps *displacement_grid, const int level)
{
const int grid_size = BKE_subdiv_grid_size_from_level(level);
const int grid_area = grid_size * grid_size;
float(*disps)[3] = MEM_calloc_arrayN(grid_area, 3 * sizeof(float), "multires disps");
if (displacement_grid->disps != NULL) {
MEM_freeN(displacement_grid->disps);
}
displacement_grid->disps = disps;
displacement_grid->totdisp = grid_area;
displacement_grid->level = level;
}
static void multires_reshape_ensure_displacement_grid(MDisps *displacement_grid, const int level)
{
if (displacement_grid->disps != NULL && displacement_grid->level == level) {
return;
}
multires_reshape_allocate_displacement_grid(displacement_grid, level);
}
static void multires_reshape_ensure_displacement_grids(Mesh *mesh, const int grid_level)
{
const int num_grids = mesh->totloop;
MDisps *mdisps = CustomData_get_layer(&mesh->ldata, CD_MDISPS);
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
multires_reshape_ensure_displacement_grid(&mdisps[grid_index], grid_level);
}
}
static void multires_reshape_ensure_mask_grids(Mesh *mesh, const int grid_level)
{
GridPaintMask *grid_paint_masks = CustomData_get_layer(&mesh->ldata, CD_GRID_PAINT_MASK);
if (grid_paint_masks == NULL) {
return;
}
const int num_grids = mesh->totloop;
const int grid_size = BKE_subdiv_grid_size_from_level(grid_level);
const int grid_area = grid_size * grid_size;
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
GridPaintMask *grid_paint_mask = &grid_paint_masks[grid_index];
if (grid_paint_mask->level == grid_level) {
continue;
}
grid_paint_mask->level = grid_level;
if (grid_paint_mask->data) {
MEM_freeN(grid_paint_mask->data);
}
grid_paint_mask->data = MEM_calloc_arrayN(grid_area, sizeof(float), "gpm.data");
}
}
static void multires_reshape_ensure_grids(Mesh *mesh, const int grid_level)
{
multires_reshape_ensure_displacement_grids(mesh, grid_level);
multires_reshape_ensure_mask_grids(mesh, grid_level);
}
/* Convert normalized coordinate within a grid to a normalized coordinate within
* a ptex face. */
static void multires_reshape_corner_coord_to_ptex(const MPoly *coarse_poly,
const int corner,
const float corner_u,
const float corner_v,
float *r_ptex_face_u,
float *r_ptex_face_v)
{
if (coarse_poly->totloop == 4) {
float grid_u, grid_v;
BKE_subdiv_ptex_face_uv_to_grid_uv(corner_u, corner_v, &grid_u, &grid_v);
BKE_subdiv_rotate_grid_to_quad(corner, grid_u, grid_v, r_ptex_face_u, r_ptex_face_v);
}
else {
*r_ptex_face_u = corner_u;
*r_ptex_face_v = corner_v;
}
}
/* NOTE: The tangent vectors are measured in ptex face normalized coordinates,
* which is different from grid tangent. */
static void multires_reshape_sample_surface(Subdiv *subdiv,
const MPoly *coarse_poly,
const int corner,
const float corner_u,
const float corner_v,
const int ptex_face_index,
float r_P[3],
float r_dPdu[3],
float r_dPdv[3])
{
float ptex_face_u, ptex_face_v;
multires_reshape_corner_coord_to_ptex(
coarse_poly, corner, corner_u, corner_v, &ptex_face_u, &ptex_face_v);
BKE_subdiv_eval_limit_point_and_derivatives(
subdiv, ptex_face_index, ptex_face_u, ptex_face_v, r_P, r_dPdu, r_dPdv);
}
static void multires_reshape_tangent_matrix_for_corner(const MPoly *coarse_poly,
const int coarse_corner,
const float dPdu[3],
const float dPdv[3],
float r_tangent_matrix[3][3])
{
/* For a quad faces we would need to flip the tangent, since they will use
* use different coordinates within displacement grid comparent to ptex
* face. */
const bool is_quad = (coarse_poly->totloop == 4);
const int tangent_corner = is_quad ? coarse_corner : 0;
BKE_multires_construct_tangent_matrix(r_tangent_matrix, dPdu, dPdv, tangent_corner);
}
static void multires_reshape_vertex_from_final_data(MultiresReshapeContext *ctx,
const int ptex_face_index,
const float corner_u,
const float corner_v,
const int coarse_poly_index,
const int coarse_corner,
const float final_P[3],
const float final_mask)
{
Subdiv *subdiv = ctx->subdiv;
const int grid_size = ctx->top_grid_size;
const Mesh *coarse_mesh = ctx->coarse_mesh;
const MPoly *coarse_mpoly = coarse_mesh->mpoly;
const MPoly *coarse_poly = &coarse_mpoly[coarse_poly_index];
const int loop_index = coarse_poly->loopstart + coarse_corner;
/* Evaluate limit surface. */
float P[3], dPdu[3], dPdv[3];
multires_reshape_sample_surface(
subdiv, coarse_poly, coarse_corner, corner_u, corner_v, ptex_face_index, P, dPdu, dPdv);
/* Construct tangent matrix which matches orientation of the current
* displacement grid. */
float tangent_matrix[3][3], inv_tangent_matrix[3][3];
multires_reshape_tangent_matrix_for_corner(
coarse_poly, coarse_corner, dPdu, dPdv, tangent_matrix);
invert_m3_m3(inv_tangent_matrix, tangent_matrix);
/* Convert object coordinate to a tangent space of displacement grid. */
float D[3];
sub_v3_v3v3(D, final_P, P);
float tangent_D[3];
mul_v3_m3v3(tangent_D, inv_tangent_matrix, D);
/* Calculate index of element within the grid. */
float grid_u, grid_v;
BKE_subdiv_ptex_face_uv_to_grid_uv(corner_u, corner_v, &grid_u, &grid_v);
const int grid_x = (grid_u * (grid_size - 1) + 0.5f);
const int grid_y = (grid_v * (grid_size - 1) + 0.5f);
const int index = grid_y * grid_size + grid_x;
/* Write tangent displacement. */
MDisps *displacement_grid = &ctx->mdisps[loop_index];
copy_v3_v3(displacement_grid->disps[index], tangent_D);
/* Write mask grid. */
if (ctx->grid_paint_mask != NULL) {
GridPaintMask *grid_paint_mask = &ctx->grid_paint_mask[loop_index];
BLI_assert(grid_paint_mask->level == displacement_grid->level);
grid_paint_mask->data[index] = final_mask;
}
}
/* =============================================================================
* Helpers to propagate displacement to higher levels.
*/
typedef struct MultiresPropagateData {
/* Number of displacement grids. */
int num_grids;
/* Resolution level up to which displacement is known. */
int reshape_level;
/* Resolution up to which propagation is happening, affecting all the
* levels in [reshape_level + 1, top_level]. */
int top_level;
/* Grid sizes at the corresponding levels. */
int reshape_grid_size;
int top_grid_size;
/* Keys to access CCG at different levels. */
CCGKey reshape_level_key;
CCGKey top_level_key;
/* Original grid data, before any updates for reshape.
* Contains data at the reshape_level resolution level. */
CCGElem **orig_grids_data;
/* Custom data layers from a coarse mesh. */
MDisps *mdisps;
GridPaintMask *grid_paint_mask;
} MultiresPropagateData;
static CCGElem **allocate_grids(CCGKey *key, int num_grids)
{
CCGElem **grids = MEM_calloc_arrayN(num_grids, sizeof(CCGElem *), "reshape grids*");
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
grids[grid_index] = MEM_calloc_arrayN(
key->elem_size, key->grid_area, "reshape orig_grids_data elems");
}
return grids;
}
static void free_grids(CCGElem **grids, int num_grids)
{
if (grids == NULL) {
return;
}
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
MEM_freeN(grids[grid_index]);
}
MEM_freeN(grids);
}
/* Initialize element sizes and offsets. */
static void multires_reshape_init_key_layers(CCGKey *key, const MultiresPropagateData *data)
{
key->elem_size = 3 * sizeof(float);
if (data->grid_paint_mask != NULL) {
key->mask_offset = 3 * sizeof(float);
key->elem_size += sizeof(float);
key->has_mask = true;
}
else {
key->mask_offset = -1;
key->has_mask = false;
}
/* We never have normals in original grids. */
key->normal_offset = -1;
key->has_normals = false;
}
/* Initialize key used to access reshape grids at given level. */
static void multires_reshape_init_level_key(CCGKey *key,
const MultiresPropagateData *data,
const int level)
{
key->level = level;
/* Init layers. */
multires_reshape_init_key_layers(key, data);
/* By default, only 3 floats for coordinate, */
key->grid_size = BKE_subdiv_grid_size_from_level(key->level);
key->grid_area = key->grid_size * key->grid_size;
key->grid_bytes = key->elem_size * key->grid_area;
}
static void multires_reshape_store_original_grids(MultiresPropagateData *data)
{
const int num_grids = data->num_grids;
/* Original data to be backed up. */
const MDisps *mdisps = data->mdisps;
const GridPaintMask *grid_paint_mask = data->grid_paint_mask;
/* Allocate grids for backup. */
CCGKey *orig_key = &data->reshape_level_key;
CCGElem **orig_grids_data = allocate_grids(orig_key, num_grids);
/* Fill in grids. */
const int orig_grid_size = data->reshape_grid_size;
const int top_grid_size = data->top_grid_size;
const int skip = (top_grid_size - 1) / (orig_grid_size - 1);
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
CCGElem *orig_grid = orig_grids_data[grid_index];
for (int y = 0; y < orig_grid_size; y++) {
const int top_y = y * skip;
for (int x = 0; x < orig_grid_size; x++) {
const int top_x = x * skip;
const int top_index = top_y * top_grid_size + top_x;
memcpy(CCG_grid_elem_co(orig_key, orig_grid, x, y),
mdisps[grid_index].disps[top_index],
sizeof(float) * 3);
if (orig_key->has_mask) {
*CCG_grid_elem_mask(
orig_key, orig_grid, x, y) = grid_paint_mask[grid_index].data[top_index];
}
}
}
}
/* Store in the context. */
data->orig_grids_data = orig_grids_data;
}
static void multires_reshape_propagate_prepare(MultiresPropagateData *data,
Mesh *coarse_mesh,
const int reshape_level,
const int top_level)
{
BLI_assert(reshape_level <= top_level);
memset(data, 0, sizeof(*data));
data->num_grids = coarse_mesh->totloop;
data->reshape_level = reshape_level;
data->top_level = top_level;
if (reshape_level == top_level) {
/* Nothing to do, reshape will happen on the whole grid content. */
return;
}
data->mdisps = CustomData_get_layer(&coarse_mesh->ldata, CD_MDISPS);
data->grid_paint_mask = CustomData_get_layer(&coarse_mesh->ldata, CD_GRID_PAINT_MASK);
data->top_grid_size = BKE_subdiv_grid_size_from_level(top_level);
data->reshape_grid_size = BKE_subdiv_grid_size_from_level(reshape_level);
/* Initialize keys to access CCG at different levels. */
multires_reshape_init_level_key(&data->reshape_level_key, data, data->reshape_level);
multires_reshape_init_level_key(&data->top_level_key, data, data->top_level);
/* Make a copy of grids before reshaping, so we can calculate deltas
* later on. */
multires_reshape_store_original_grids(data);
}
static void multires_reshape_propagate_prepare_from_mmd(MultiresPropagateData *data,
struct Depsgraph *depsgraph,
Object *object,
const MultiresModifierData *mmd,
const int top_level,
const bool use_render_params)
{
/* TODO(sergey): Find mode reliable way of getting current level. */
Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
Mesh *mesh = object->data;
const int level = multires_get_level(scene_eval, object, mmd, use_render_params, true);
multires_reshape_propagate_prepare(data, mesh, level, top_level);
}
/* Calculate delta of changed reshape level data layers. Delta goes to a
* grids at top level (meaning, the result grids are only partially filled
* in). */
static void multires_reshape_calculate_delta(MultiresPropagateData *data,
CCGElem **delta_grids_data)
{
const int num_grids = data->num_grids;
/* At this point those custom data layers has updated data for the
* level we are propagating from. */
const MDisps *mdisps = data->mdisps;
const GridPaintMask *grid_paint_mask = data->grid_paint_mask;
CCGKey *reshape_key = &data->reshape_level_key;
CCGKey *delta_level_key = &data->top_level_key;
/* Calculate delta. */
const int top_grid_size = data->top_grid_size;
const int reshape_grid_size = data->reshape_grid_size;
const int delta_grid_size = data->top_grid_size;
const int skip = (top_grid_size - 1) / (reshape_grid_size - 1);
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
/*const*/ CCGElem *orig_grid = data->orig_grids_data[grid_index];
CCGElem *delta_grid = delta_grids_data[grid_index];
for (int y = 0; y < reshape_grid_size; y++) {
const int top_y = y * skip;
for (int x = 0; x < reshape_grid_size; x++) {
const int top_x = x * skip;
const int top_index = top_y * delta_grid_size + top_x;
sub_v3_v3v3(CCG_grid_elem_co(delta_level_key, delta_grid, top_x, top_y),
mdisps[grid_index].disps[top_index],
CCG_grid_elem_co(reshape_key, orig_grid, x, y));
if (delta_level_key->has_mask) {
const float old_mask_value = *CCG_grid_elem_mask(reshape_key, orig_grid, x, y);
const float new_mask_value = grid_paint_mask[grid_index].data[top_index];
*CCG_grid_elem_mask(delta_level_key, delta_grid, top_x, top_y) = new_mask_value -
old_mask_value;
}
}
}
}
}
/* Makes it so delta is propagated onto all the higher levels, but is also
* that this delta is smoothed in a way that it does not cause artifacts on
* boundaries. */
typedef struct MultiresPropagateCornerData {
float coord_delta[3];
float mask_delta;
} MultiresPropagateCornerData;
BLI_INLINE void multires_reshape_propagate_init_patch_corners(
MultiresPropagateData *data,
CCGElem *delta_grid,
const int patch_x,
const int patch_y,
MultiresPropagateCornerData r_corners[4])
{
CCGKey *delta_level_key = &data->top_level_key;
const int orig_grid_size = data->reshape_grid_size;
const int top_grid_size = data->top_grid_size;
const int skip = (top_grid_size - 1) / (orig_grid_size - 1);
const int x = patch_x * skip;
const int y = patch_y * skip;
/* Store coordinate deltas. */
copy_v3_v3(r_corners[0].coord_delta, CCG_grid_elem_co(delta_level_key, delta_grid, x, y));
copy_v3_v3(r_corners[1].coord_delta, CCG_grid_elem_co(delta_level_key, delta_grid, x + skip, y));
copy_v3_v3(r_corners[2].coord_delta, CCG_grid_elem_co(delta_level_key, delta_grid, x, y + skip));
copy_v3_v3(r_corners[3].coord_delta,
CCG_grid_elem_co(delta_level_key, delta_grid, x + skip, y + skip));
if (delta_level_key->has_mask) {
r_corners[0].mask_delta = *CCG_grid_elem_mask(delta_level_key, delta_grid, x, y);
r_corners[1].mask_delta = *CCG_grid_elem_mask(delta_level_key, delta_grid, x + skip, y);
r_corners[2].mask_delta = *CCG_grid_elem_mask(delta_level_key, delta_grid, x, y + skip);
r_corners[3].mask_delta = *CCG_grid_elem_mask(delta_level_key, delta_grid, x + skip, y + skip);
}
}
BLI_INLINE void multires_reshape_propagate_interpolate_coord(
float delta[3], const MultiresPropagateCornerData corners[4], const float weights[4])
{
interp_v3_v3v3v3v3(delta,
corners[0].coord_delta,
corners[1].coord_delta,
corners[2].coord_delta,
corners[3].coord_delta,
weights);
}
BLI_INLINE float multires_reshape_propagate_interpolate_mask(
const MultiresPropagateCornerData corners[4], const float weights[4])
{
return corners[0].mask_delta * weights[0] + corners[1].mask_delta * weights[1] +
corners[2].mask_delta * weights[2] + corners[3].mask_delta * weights[3];
}
BLI_INLINE void multires_reshape_propagate_and_smooth_delta_grid_patch(MultiresPropagateData *data,
CCGElem *delta_grid,
const int patch_x,
const int patch_y)
{
CCGKey *delta_level_key = &data->top_level_key;
const int orig_grid_size = data->reshape_grid_size;
const int top_grid_size = data->top_grid_size;
const int skip = (top_grid_size - 1) / (orig_grid_size - 1);
const float skip_inv = 1.0f / (float)skip;
MultiresPropagateCornerData corners[4];
multires_reshape_propagate_init_patch_corners(data, delta_grid, patch_x, patch_y, corners);
const int start_x = patch_x * skip;
const int start_y = patch_y * skip;
for (int y = 0; y <= skip; y++) {
const float v = (float)y * skip_inv;
const int final_y = start_y + y;
for (int x = 0; x <= skip; x++) {
const float u = (float)x * skip_inv;
const int final_x = start_x + x;
const float linear_weights[4] = {
(1.0f - u) * (1.0f - v), u * (1.0f - v), (1.0f - u) * v, u * v};
multires_reshape_propagate_interpolate_coord(
CCG_grid_elem_co(delta_level_key, delta_grid, final_x, final_y),
corners,
linear_weights);
if (delta_level_key->has_mask) {
float *mask = CCG_grid_elem_mask(delta_level_key, delta_grid, final_x, final_y);
*mask = multires_reshape_propagate_interpolate_mask(corners, linear_weights);
}
}
}
}
BLI_INLINE void multires_reshape_propagate_and_smooth_delta_grid(MultiresPropagateData *data,
CCGElem *delta_grid)
{
const int orig_grid_size = data->reshape_grid_size;
for (int patch_y = 0; patch_y < orig_grid_size - 1; patch_y++) {
for (int patch_x = 0; patch_x < orig_grid_size - 1; patch_x++) {
multires_reshape_propagate_and_smooth_delta_grid_patch(data, delta_grid, patch_x, patch_y);
}
}
}
/* Entry point to propagate+smooth. */
static void multires_reshape_propagate_and_smooth_delta(MultiresPropagateData *data,
CCGElem **delta_grids_data)
{
const int num_grids = data->num_grids;
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
CCGElem *delta_grid = delta_grids_data[grid_index];
multires_reshape_propagate_and_smooth_delta_grid(data, delta_grid);
}
}
/* Apply smoothed deltas on the actual data layers. */
static void multires_reshape_propagate_apply_delta(MultiresPropagateData *data,
CCGElem **delta_grids_data)
{
const int num_grids = data->num_grids;
/* At this point those custom data layers has updated data for the
* level we are propagating from. */
MDisps *mdisps = data->mdisps;
GridPaintMask *grid_paint_mask = data->grid_paint_mask;
CCGKey *orig_key = &data->reshape_level_key;
CCGKey *delta_level_key = &data->top_level_key;
CCGElem **orig_grids_data = data->orig_grids_data;
const int orig_grid_size = data->reshape_grid_size;
const int top_grid_size = data->top_grid_size;
const int skip = (top_grid_size - 1) / (orig_grid_size - 1);
/* Restore grid values at the reshape level. Those values are to be changed
* to the accommodate for the smooth delta. */
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
CCGElem *orig_grid = orig_grids_data[grid_index];
for (int y = 0; y < orig_grid_size; y++) {
const int top_y = y * skip;
for (int x = 0; x < orig_grid_size; x++) {
const int top_x = x * skip;
const int top_index = top_y * top_grid_size + top_x;
copy_v3_v3(mdisps[grid_index].disps[top_index],
CCG_grid_elem_co(orig_key, orig_grid, x, y));
if (grid_paint_mask != NULL) {
grid_paint_mask[grid_index].data[top_index] = *CCG_grid_elem_mask(
orig_key, orig_grid, x, y);
}
}
}
}
/* Add smoothed delta to all the levels. */
for (int grid_index = 0; grid_index < num_grids; grid_index++) {
CCGElem *delta_grid = delta_grids_data[grid_index];
for (int y = 0; y < top_grid_size; y++) {
for (int x = 0; x < top_grid_size; x++) {
const int top_index = y * top_grid_size + x;
add_v3_v3(mdisps[grid_index].disps[top_index],
CCG_grid_elem_co(delta_level_key, delta_grid, x, y));
if (delta_level_key->has_mask) {
grid_paint_mask[grid_index].data[top_index] += *CCG_grid_elem_mask(
delta_level_key, delta_grid, x, y);
}
}
}
}
}
static void multires_reshape_propagate(MultiresPropagateData *data)
{
if (data->reshape_level == data->top_level) {
return;
}
const int num_grids = data->num_grids;
/* Calculate delta made at the reshape level. */
CCGKey *delta_level_key = &data->top_level_key;
CCGElem **delta_grids_data = allocate_grids(delta_level_key, num_grids);
multires_reshape_calculate_delta(data, delta_grids_data);
/* Propagate deltas to the higher levels. */
multires_reshape_propagate_and_smooth_delta(data, delta_grids_data);
/* Finally, apply smoothed deltas. */
multires_reshape_propagate_apply_delta(data, delta_grids_data);
/* Cleanup. */
free_grids(delta_grids_data, num_grids);
}
static void multires_reshape_propagate_free(MultiresPropagateData *data)
{
free_grids(data->orig_grids_data, data->num_grids);
}
/* =============================================================================
* Reshape from deformed vertex coordinates.
*/
typedef struct MultiresReshapeFromDeformedVertsContext {
MultiresReshapeContext reshape_ctx;
const float (*deformed_verts)[3];
int num_deformed_verts;
} MultiresReshapeFromDeformedVertsContext;
static bool multires_reshape_topology_info(const SubdivForeachContext *foreach_context,
const int num_vertices,
const int UNUSED(num_edges),
const int UNUSED(num_loops),
const int UNUSED(num_polygons))
{
MultiresReshapeFromDeformedVertsContext *ctx = foreach_context->user_data;
if (num_vertices != ctx->num_deformed_verts) {
return false;
}
return true;
}
/* Will run reshaping for all grid elements which are adjacent to the given
* one. This is the way to ensure continuity of displacement stored in the
* grids across the inner boundaries of the grids. */
static void multires_reshape_neighour_boundary_vertices(MultiresReshapeContext *ctx,
const int UNUSED(ptex_face_index),
const float corner_u,
const float corner_v,
const int coarse_poly_index,
const int coarse_corner,
const float final_P[3],
const float final_mask)
{
const Mesh *coarse_mesh = ctx->coarse_mesh;
const MPoly *coarse_mpoly = coarse_mesh->mpoly;
const MPoly *coarse_poly = &coarse_mpoly[coarse_poly_index];
const int num_corners = coarse_poly->totloop;
const int start_ptex_face_index = ctx->face_ptex_offset[coarse_poly_index];
const bool is_quad = (coarse_poly->totloop == 4);
if (corner_u == 1.0f && corner_v == 1.0f) {
for (int current_corner = 0; current_corner < num_corners; current_corner++) {
if (current_corner == coarse_corner) {
continue;
}
const int current_ptex_face_index = is_quad ? start_ptex_face_index :
start_ptex_face_index + current_corner;
multires_reshape_vertex_from_final_data(ctx,
current_ptex_face_index,
1.0f,
1.0f,
coarse_poly_index,
current_corner,
final_P,
final_mask);
}
}
else if (corner_u == 1.0f) {
const float next_corner_index = (coarse_corner + 1) % num_corners;
const float next_corner_u = corner_v;
const float next_corner_v = 1.0f;
const int next_ptex_face_index = is_quad ? start_ptex_face_index :
start_ptex_face_index + next_corner_index;
multires_reshape_vertex_from_final_data(ctx,
next_ptex_face_index,
next_corner_u,
next_corner_v,
coarse_poly_index,
next_corner_index,
final_P,
final_mask);
}
else if (corner_v == 1.0f) {
const float prev_corner_index = (coarse_corner + num_corners - 1) % num_corners;
const float prev_corner_u = 1.0f;
const float prev_corner_v = corner_u;
const int prev_ptex_face_index = is_quad ? start_ptex_face_index :
start_ptex_face_index + prev_corner_index;
multires_reshape_vertex_from_final_data(ctx,
prev_ptex_face_index,
prev_corner_u,
prev_corner_v,
coarse_poly_index,
prev_corner_index,
final_P,
final_mask);
}
}
static void multires_reshape_vertex(MultiresReshapeFromDeformedVertsContext *ctx,
const int ptex_face_index,
const float u,
const float v,
const int coarse_poly_index,
const int coarse_corner,
const int subdiv_vertex_index)
{
const float *final_P = ctx->deformed_verts[subdiv_vertex_index];
const Mesh *coarse_mesh = ctx->reshape_ctx.coarse_mesh;
const MPoly *coarse_mpoly = coarse_mesh->mpoly;
const MPoly *coarse_poly = &coarse_mpoly[coarse_poly_index];
const bool is_quad = (coarse_poly->totloop == 4);
float corner_u, corner_v;
int actual_coarse_corner;
if (is_quad) {
actual_coarse_corner = BKE_subdiv_rotate_quad_to_corner(u, v, &corner_u, &corner_v);
}
else {
actual_coarse_corner = coarse_corner;
corner_u = u;
corner_v = v;
}
multires_reshape_vertex_from_final_data(&ctx->reshape_ctx,
ptex_face_index,
corner_u,
corner_v,
coarse_poly_index,
actual_coarse_corner,
final_P,
0.0f);
multires_reshape_neighour_boundary_vertices(&ctx->reshape_ctx,
ptex_face_index,
corner_u,
corner_v,
coarse_poly_index,
actual_coarse_corner,
final_P,
0.0f);
}
static void multires_reshape_vertex_inner(const SubdivForeachContext *foreach_context,
void *UNUSED(tls_v),
const int ptex_face_index,
const float u,
const float v,
const int coarse_poly_index,
const int coarse_corner,
const int subdiv_vertex_index)
{
MultiresReshapeFromDeformedVertsContext *ctx = foreach_context->user_data;
multires_reshape_vertex(
ctx, ptex_face_index, u, v, coarse_poly_index, coarse_corner, subdiv_vertex_index);
}
static void multires_reshape_vertex_every_corner(
const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls_v),
const int ptex_face_index,
const float u,
const float v,
const int UNUSED(coarse_vertex_index),
const int coarse_poly_index,
const int coarse_corner,
const int subdiv_vertex_index)
{
MultiresReshapeFromDeformedVertsContext *ctx = foreach_context->user_data;
multires_reshape_vertex(
ctx, ptex_face_index, u, v, coarse_poly_index, coarse_corner, subdiv_vertex_index);
}
static void multires_reshape_vertex_every_edge(const struct SubdivForeachContext *foreach_context,
void *UNUSED(tls_v),
const int ptex_face_index,
const float u,
const float v,
const int UNUSED(coarse_edge_index),
const int coarse_poly_index,
const int coarse_corner,
const int subdiv_vertex_index)
{
MultiresReshapeFromDeformedVertsContext *ctx = foreach_context->user_data;
multires_reshape_vertex(
ctx, ptex_face_index, u, v, coarse_poly_index, coarse_corner, subdiv_vertex_index);
}
static Subdiv *multires_create_subdiv_for_reshape(struct Depsgraph *depsgraph,
/*const*/ Object *object,
const MultiresModifierData *mmd)
{
Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
Object *object_eval = DEG_get_evaluated_object(depsgraph, object);
Mesh *deformed_mesh = mesh_get_eval_deform(
depsgraph, scene_eval, object_eval, &CD_MASK_BAREMESH);
SubdivSettings subdiv_settings;
BKE_multires_subdiv_settings_init(&subdiv_settings, mmd);
Subdiv *subdiv = BKE_subdiv_new_from_mesh(&subdiv_settings, deformed_mesh);
if (!BKE_subdiv_eval_update_from_mesh(subdiv, deformed_mesh, NULL)) {
BKE_subdiv_free(subdiv);
return NULL;
}
return subdiv;
}
static bool multires_reshape_from_vertcos(struct Depsgraph *depsgraph,
Object *object,
const MultiresModifierData *mmd,
const float (*deformed_verts)[3],
const int num_deformed_verts,
const bool use_render_params)
{
Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
Mesh *coarse_mesh = object->data;
MDisps *mdisps = CustomData_get_layer(&coarse_mesh->ldata, CD_MDISPS);
/* Pick maximum between multires level and displacement level.
* This is because mesh can be used by objects with multires at different
* levels.
*
* TODO(sergey): At this point it should be possible to always use
* mdisps->level. */
const int top_level = max_ii(mmd->totlvl, mdisps->level);
/* Make sure displacement grids are ready. */
multires_reshape_ensure_grids(coarse_mesh, top_level);
/* Initialize subdivision surface. */
Subdiv *subdiv = multires_create_subdiv_for_reshape(depsgraph, object, mmd);
if (subdiv == NULL) {
return false;
}
/* Construct context. */
MultiresReshapeFromDeformedVertsContext reshape_deformed_verts_ctx = {
.reshape_ctx =
{
.subdiv = subdiv,
.coarse_mesh = coarse_mesh,
.mdisps = mdisps,
.grid_paint_mask = NULL,
.top_grid_size = BKE_subdiv_grid_size_from_level(top_level),
.top_level = top_level,
.face_ptex_offset = BKE_subdiv_face_ptex_offset_get(subdiv),
},
.deformed_verts = deformed_verts,
.num_deformed_verts = num_deformed_verts,
};
SubdivForeachContext foreach_context = {
.topology_info = multires_reshape_topology_info,
.vertex_inner = multires_reshape_vertex_inner,
.vertex_every_edge = multires_reshape_vertex_every_edge,
.vertex_every_corner = multires_reshape_vertex_every_corner,
.user_data = &reshape_deformed_verts_ctx,
};
/* Initialize mesh rasterization settings. */
SubdivToMeshSettings mesh_settings;
BKE_multires_subdiv_mesh_settings_init(
&mesh_settings, scene_eval, object, mmd, use_render_params, true);
/* Initialize propagation to higher levels. */
MultiresPropagateData propagate_data;
multires_reshape_propagate_prepare_from_mmd(
&propagate_data, depsgraph, object, mmd, top_level, use_render_params);
/* Run all the callbacks. */
BKE_subdiv_foreach_subdiv_geometry(subdiv, &foreach_context, &mesh_settings, coarse_mesh);
BKE_subdiv_free(subdiv);
/* Update higher levels if needed. */
multires_reshape_propagate(&propagate_data);
multires_reshape_propagate_free(&propagate_data);
return true;
}
/* =============================================================================
* Reshape from object.
*/
/* Returns truth on success, false otherwise.
*
* This function might fail in cases like source and destination not having
* matched amount of vertices. */
bool multiresModifier_reshapeFromObject(struct Depsgraph *depsgraph,
MultiresModifierData *mmd,
Object *dst,
Object *src)
{
/* Would be cool to support this eventually, but it is very tricky to match
* vertices order even for meshes, when mixing meshes and other objects it's
* even more tricky. */
if (src->type != OB_MESH) {
return false;
}
MultiresModifierData reshape_mmd;
multires_reshape_init_mmd(&reshape_mmd, mmd);
/* Get evaluated vertices locations to reshape to. */
Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
Object *src_eval = DEG_get_evaluated_object(depsgraph, src);
Mesh *src_mesh_eval = mesh_get_eval_final(depsgraph, scene_eval, src_eval, &CD_MASK_BAREMESH);
int num_deformed_verts;
float(*deformed_verts)[3] = BKE_mesh_vert_coords_alloc(src_mesh_eval, &num_deformed_verts);
bool result = multires_reshape_from_vertcos(
depsgraph, dst, &reshape_mmd, deformed_verts, num_deformed_verts, false);
MEM_freeN(deformed_verts);
return result;
}
/* =============================================================================
* Reshape from modifier.
*/
bool multiresModifier_reshapeFromDeformModifier(struct Depsgraph *depsgraph,
MultiresModifierData *mmd,
Object *object,
ModifierData *md)
{
MultiresModifierData highest_mmd;
/* It is possible that the current subdivision level of multires is lower
* that it's maximum possible one (i.e., viewport is set to a lower level
* for the performance purposes). But even then, we want all the multires
* levels to be reshaped. Most accurate way to do so is to ignore all
* simplifications and calculate deformation modifier for the highest
* possible multires level.
* Alternative would be propagate displacement from current level to a
* higher ones, but that is likely to cause artifacts. */
multires_reshape_init_mmd_top_level(&highest_mmd, mmd);
Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
/* Perform sanity checks and early output. */
if (multires_get_level(scene_eval, object, &highest_mmd, false, true) == 0) {
return false;
}
/* Create mesh for the multires, ignoring any further modifiers (leading
* deformation modifiers will be applied though). */
Mesh *multires_mesh = BKE_multires_create_mesh(depsgraph, scene_eval, &highest_mmd, object);
int num_deformed_verts;
float(*deformed_verts)[3] = BKE_mesh_vert_coords_alloc(multires_mesh, &num_deformed_verts);
/* Apply deformation modifier on the multires, */
const ModifierEvalContext modifier_ctx = {
.depsgraph = depsgraph,
.object = object,
.flag = MOD_APPLY_USECACHE | MOD_APPLY_IGNORE_SIMPLIFY,
};
modwrap_deformVerts(md, &modifier_ctx, multires_mesh, deformed_verts, multires_mesh->totvert);
BKE_id_free(NULL, multires_mesh);
/* Reshaping */
bool result = multires_reshape_from_vertcos(
depsgraph, object, &highest_mmd, deformed_verts, num_deformed_verts, false);
/* Cleanup */
MEM_freeN(deformed_verts);
return result;
}
/* =============================================================================
* Reshape from grids.
*/
typedef struct ReshapeFromCCGTaskData {
MultiresReshapeContext reshape_ctx;
const CCGKey *key;
/*const*/ CCGElem **grids;
} ReshapeFromCCGTaskData;
static void reshape_from_ccg_task(void *__restrict userdata,
const int coarse_poly_index,
const TaskParallelTLS *__restrict UNUSED(tls))
{
ReshapeFromCCGTaskData *data = userdata;
const CCGKey *key = data->key;
/*const*/ CCGElem **grids = data->grids;
const Mesh *coarse_mesh = data->reshape_ctx.coarse_mesh;
const MPoly *coarse_mpoly = coarse_mesh->mpoly;
const MPoly *coarse_poly = &coarse_mpoly[coarse_poly_index];
const int key_grid_size = key->grid_size;
const int key_grid_size_1 = key_grid_size - 1;
const int resolution = key_grid_size;
const float resolution_1_inv = 1.0f / (float)(resolution - 1);
const int start_ptex_face_index = data->reshape_ctx.face_ptex_offset[coarse_poly_index];
const bool is_quad = (coarse_poly->totloop == 4);
for (int corner = 0; corner < coarse_poly->totloop; corner++) {
for (int y = 0; y < resolution; y++) {
const float corner_v = y * resolution_1_inv;
for (int x = 0; x < resolution; x++) {
const float corner_u = x * resolution_1_inv;
/* Quad faces consists of a single ptex face. */
const int ptex_face_index = is_quad ? start_ptex_face_index :
start_ptex_face_index + corner;
float grid_u, grid_v;
BKE_subdiv_ptex_face_uv_to_grid_uv(corner_u, corner_v, &grid_u, &grid_v);
/*const*/ CCGElem *grid = grids[coarse_poly->loopstart + corner];
/*const*/ CCGElem *grid_element = CCG_grid_elem(
key, grid, key_grid_size_1 * grid_u, key_grid_size_1 * grid_v);
const float *final_P = CCG_elem_co(key, grid_element);
float final_mask = 0.0f;
if (key->has_mask) {
final_mask = *CCG_elem_mask(key, grid_element);
}
multires_reshape_vertex_from_final_data(&data->reshape_ctx,
ptex_face_index,
corner_u,
corner_v,
coarse_poly_index,
corner,
final_P,
final_mask);
}
}
}
}
bool multiresModifier_reshapeFromCCG(const int tot_level, Mesh *coarse_mesh, SubdivCCG *subdiv_ccg)
{
CCGKey key;
BKE_subdiv_ccg_key_top_level(&key, subdiv_ccg);
/* Sanity checks. */
if (coarse_mesh->totloop != subdiv_ccg->num_grids) {
/* Grids are supposed to eb created for each face-cornder (aka loop). */
return false;
}
MDisps *mdisps = CustomData_get_layer(&coarse_mesh->ldata, CD_MDISPS);
if (mdisps == NULL) {
/* Multires displacement has been removed before current changes were
* applies to all the levels. */
return false;
}
GridPaintMask *grid_paint_mask = CustomData_get_layer(&coarse_mesh->ldata, CD_GRID_PAINT_MASK);
Subdiv *subdiv = subdiv_ccg->subdiv;
/* Pick maximum between multires level and displacement level.
* This is because mesh can be used by objects with multires at different
* levels.
*
* TODO(sergey): At this point it should be possible to always use
* mdisps->level. */
const int top_level = max_ii(tot_level, mdisps->level);
/* Make sure displacement grids are ready. */
multires_reshape_ensure_grids(coarse_mesh, top_level);
/* Construct context. */
ReshapeFromCCGTaskData data = {
.reshape_ctx =
{
.subdiv = subdiv,
.coarse_mesh = coarse_mesh,
.mdisps = mdisps,
.grid_paint_mask = grid_paint_mask,
.top_grid_size = BKE_subdiv_grid_size_from_level(top_level),
.top_level = top_level,
.face_ptex_offset = BKE_subdiv_face_ptex_offset_get(subdiv),
},
.key = &key,
.grids = subdiv_ccg->grids,
};
/* Initialize propagation to higher levels. */
MultiresPropagateData propagate_data;
multires_reshape_propagate_prepare(&propagate_data, coarse_mesh, key.level, top_level);
/* Threaded grids iteration. */
TaskParallelSettings parallel_range_settings;
BLI_parallel_range_settings_defaults(&parallel_range_settings);
BLI_task_parallel_range(
0, coarse_mesh->totpoly, &data, reshape_from_ccg_task, &parallel_range_settings);
/* Update higher levels if needed. */
multires_reshape_propagate(&propagate_data);
multires_reshape_propagate_free(&propagate_data);
return true;
}
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