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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 <string.h>
#include "BLI_utildefines.h"
#include "BKE_ccg.h"
#include "BKE_subdiv_ccg.h"
bool multires_reshape_assign_final_coords_from_ccg(const MultiresReshapeContext *reshape_context,
struct SubdivCCG *subdiv_ccg)
{
CCGKey reshape_level_key;
BKE_subdiv_ccg_key(&reshape_level_key, subdiv_ccg, reshape_context->reshape.level);
const int reshape_grid_size = reshape_context->reshape.grid_size;
const float reshape_grid_size_1_inv = 1.0f / (((float)reshape_grid_size) - 1.0f);
int num_grids = subdiv_ccg->num_grids;
for (int grid_index = 0; grid_index < num_grids; ++grid_index) {
CCGElem *ccg_grid = subdiv_ccg->grids[grid_index];
for (int y = 0; y < reshape_grid_size; ++y) {
const float v = (float)y * reshape_grid_size_1_inv;
for (int x = 0; x < reshape_grid_size; ++x) {
const float u = (float)x * reshape_grid_size_1_inv;
GridCoord grid_coord;
grid_coord.grid_index = grid_index;
grid_coord.u = u;
grid_coord.v = v;
ReshapeGridElement grid_element = multires_reshape_grid_element_for_grid_coord(
reshape_context, &grid_coord);
BLI_assert(grid_element.displacement != NULL);
memcpy(grid_element.displacement,
CCG_grid_elem_co(&reshape_level_key, ccg_grid, x, y),
sizeof(float[3]));
/* NOTE: The sculpt mode might have SubdivCCG's data out of sync from what is stored in
* the original object. This happens upon the following scenario:
*
* - User enters sculpt mode of the default cube object.
* - Sculpt mode creates new `layer`
* - User does some strokes.
* - User used undo until sculpt mode is exited.
*
* In an ideal world the sculpt mode will take care of keeping CustomData and CCG layers in
* sync by doing proper pushes to a local sculpt undo stack.
*
* Since the proper solution needs time to be implemented, consider the target object
* the source of truth of which data layers are to be updated during reshape. This means,
* for example, that if the undo system says object does not have paint mask layer, it is
* not to be updated.
*
* This is a fragile logic, and is only working correctly because the code path is only
* used by sculpt changes. In other use cases the code might not catch inconsistency and
* silently do wrong decision. */
/* NOTE: There is a known bug in Undo code that results in first Sculpt step
* after a Memfile one to never be undone (see T83806). This might be the root cause of
* this inconsistency. */
if (reshape_level_key.has_mask && grid_element.mask != NULL) {
*grid_element.mask = *CCG_grid_elem_mask(&reshape_level_key, ccg_grid, x, y);
}
}
}
}
return true;
}
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