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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2018 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bke
*/
#include <math.h>
#include "BKE_subdiv_ccg.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "BLI_utildefines.h"
#include "BKE_customdata.h"
#include "BKE_subdiv.h"
#include "MEM_guardedalloc.h"
typedef struct PolyCornerIndex {
int poly_index;
int corner;
} PolyCornerIndex;
typedef struct GridPaintMaskData {
// int grid_size;
const MPoly *mpoly;
const GridPaintMask *grid_paint_mask;
/* Indexed by ptex face index, contains polygon/corner which corresponds
* to it.
*
* NOTE: For quad polygon this is an index of first corner only, since
* there we only have one ptex.
*/
PolyCornerIndex *ptex_poly_corner;
} GridPaintMaskData;
static int mask_get_grid_and_coord(SubdivCCGMaskEvaluator *mask_evaluator,
const int ptex_face_index,
const float u,
const float v,
const GridPaintMask **r_mask_grid,
float *grid_u,
float *grid_v)
{
GridPaintMaskData *data = mask_evaluator->user_data;
const PolyCornerIndex *poly_corner = &data->ptex_poly_corner[ptex_face_index];
const MPoly *poly = &data->mpoly[poly_corner->poly_index];
const int start_grid_index = poly->loopstart + poly_corner->corner;
int corner = 0;
if (poly->totloop == 4) {
float corner_u, corner_v;
corner = BKE_subdiv_rotate_quad_to_corner(u, v, &corner_u, &corner_v);
*r_mask_grid = &data->grid_paint_mask[start_grid_index + corner];
BKE_subdiv_ptex_face_uv_to_grid_uv(corner_u, corner_v, grid_u, grid_v);
}
else {
*r_mask_grid = &data->grid_paint_mask[start_grid_index];
BKE_subdiv_ptex_face_uv_to_grid_uv(u, v, grid_u, grid_v);
}
return corner;
}
BLI_INLINE float read_mask_grid(const GridPaintMask *mask_grid,
const float grid_u,
const float grid_v)
{
if (mask_grid->data == NULL) {
return 0;
}
const int grid_size = BKE_subdiv_grid_size_from_level(mask_grid->level);
const int x = roundf(grid_u * (grid_size - 1));
const int y = roundf(grid_v * (grid_size - 1));
return mask_grid->data[y * grid_size + x];
}
static float eval_mask(SubdivCCGMaskEvaluator *mask_evaluator,
const int ptex_face_index,
const float u,
const float v)
{
const GridPaintMask *mask_grid;
float grid_u, grid_v;
mask_get_grid_and_coord(mask_evaluator, ptex_face_index, u, v, &mask_grid, &grid_u, &grid_v);
return read_mask_grid(mask_grid, grid_u, grid_v);
}
static void free_mask_data(SubdivCCGMaskEvaluator *mask_evaluator)
{
GridPaintMaskData *data = mask_evaluator->user_data;
MEM_freeN(data->ptex_poly_corner);
MEM_freeN(data);
}
/* TODO(sergey): This seems to be generally used information, which almost
* worth adding to a subdiv itself, with possible cache of the value.
*/
static int count_num_ptex_faces(const Mesh *mesh)
{
int num_ptex_faces = 0;
const MPoly *mpoly = mesh->mpoly;
for (int poly_index = 0; poly_index < mesh->totpoly; poly_index++) {
const MPoly *poly = &mpoly[poly_index];
num_ptex_faces += (poly->totloop == 4) ? 1 : poly->totloop;
}
return num_ptex_faces;
}
static void mask_data_init_mapping(SubdivCCGMaskEvaluator *mask_evaluator, const Mesh *mesh)
{
GridPaintMaskData *data = mask_evaluator->user_data;
const MPoly *mpoly = mesh->mpoly;
const int num_ptex_faces = count_num_ptex_faces(mesh);
/* Allocate memory. */
data->ptex_poly_corner = MEM_malloc_arrayN(
num_ptex_faces, sizeof(*data->ptex_poly_corner), "ptex poly corner");
/* Fill in offsets. */
int ptex_face_index = 0;
PolyCornerIndex *ptex_poly_corner = data->ptex_poly_corner;
for (int poly_index = 0; poly_index < mesh->totpoly; poly_index++) {
const MPoly *poly = &mpoly[poly_index];
if (poly->totloop == 4) {
ptex_poly_corner[ptex_face_index].poly_index = poly_index;
ptex_poly_corner[ptex_face_index].corner = 0;
ptex_face_index++;
}
else {
for (int corner = 0; corner < poly->totloop; corner++) {
ptex_poly_corner[ptex_face_index].poly_index = poly_index;
ptex_poly_corner[ptex_face_index].corner = corner;
ptex_face_index++;
}
}
}
}
static void mask_init_data(SubdivCCGMaskEvaluator *mask_evaluator, const Mesh *mesh)
{
GridPaintMaskData *data = mask_evaluator->user_data;
data->mpoly = mesh->mpoly;
data->grid_paint_mask = CustomData_get_layer(&mesh->ldata, CD_GRID_PAINT_MASK);
mask_data_init_mapping(mask_evaluator, mesh);
}
static void mask_init_functions(SubdivCCGMaskEvaluator *mask_evaluator)
{
mask_evaluator->eval_mask = eval_mask;
mask_evaluator->free = free_mask_data;
}
bool BKE_subdiv_ccg_mask_init_from_paint(SubdivCCGMaskEvaluator *mask_evaluator,
const struct Mesh *mesh)
{
if (!CustomData_get_layer(&mesh->ldata, CD_GRID_PAINT_MASK)) {
return false;
}
/* Allocate all required memory. */
mask_evaluator->user_data = MEM_callocN(sizeof(GridPaintMaskData), "mask from grid data");
mask_init_data(mask_evaluator, mesh);
mask_init_functions(mask_evaluator);
return true;
}
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