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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2012 by Nicholas Bishop. All rights reserved. */
#pragma once
/** \file
* \ingroup bke
*/
/* defines BLI_INLINE */
#include "BLI_compiler_compat.h"
/* declares fprintf() and abort(), needed for BLI_assert */
#include <stdio.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
struct CCGSubSurf;
/* Each CCGElem is CCGSubSurf's representation of a subdivided
* vertex. All CCGElems in a particular CCGSubSurf have the same
* layout, but the layout can vary from one CCGSubSurf to another. For
* this reason, CCGElem is presented as an opaque pointer, and
* elements should always be accompanied by a CCGKey, which provides
* the necessary offsets to access components of a CCGElem.
*/
typedef struct CCGElem CCGElem;
typedef struct CCGKey {
int level;
/* number of bytes in each element (one float per layer, plus
* three floats for normals if enabled) */
int elem_size;
/* number of elements along each side of grid */
int grid_size;
/* number of elements in the grid (grid size squared) */
int grid_area;
/* number of bytes in each grid (grid_area * elem_size) */
int grid_bytes;
/* currently always the last three floats, unless normals are
* disabled */
int normal_offset;
/* offset in bytes of mask value; only valid if 'has_mask' is
* true */
int mask_offset;
int has_normals;
int has_mask;
} CCGKey;
/* initialize 'key' at the specified level */
void CCG_key(CCGKey *key, const struct CCGSubSurf *ss, int level);
void CCG_key_top_level(CCGKey *key, const struct CCGSubSurf *ss);
/* get a pointer to the coordinate, normal, or mask components */
BLI_INLINE float *CCG_elem_co(const CCGKey *key, CCGElem *elem);
BLI_INLINE float *CCG_elem_no(const CCGKey *key, CCGElem *elem);
BLI_INLINE float *CCG_elem_mask(const CCGKey *key, CCGElem *elem);
/* get the element at 'offset' in an array */
BLI_INLINE CCGElem *CCG_elem_offset(const CCGKey *key, CCGElem *elem, int offset);
/* get the element at coordinate (x,y) in a face-grid array */
BLI_INLINE CCGElem *CCG_grid_elem(const CCGKey *key, CCGElem *elem, int x, int y);
/* combinations of above functions */
BLI_INLINE float *CCG_grid_elem_co(const CCGKey *key, CCGElem *elem, int x, int y);
BLI_INLINE float *CCG_grid_elem_no(const CCGKey *key, CCGElem *elem, int x, int y);
BLI_INLINE float *CCG_grid_elem_mask(const CCGKey *key, CCGElem *elem, int x, int y);
BLI_INLINE float *CCG_elem_offset_co(const CCGKey *key, CCGElem *elem, int offset);
BLI_INLINE float *CCG_elem_offset_no(const CCGKey *key, CCGElem *elem, int offset);
BLI_INLINE float *CCG_elem_offset_mask(const CCGKey *key, CCGElem *elem, int offset);
/* for iteration, get a pointer to the next element in an array */
BLI_INLINE CCGElem *CCG_elem_next(const CCGKey *key, CCGElem *elem);
/* inline definitions follow */
BLI_INLINE float *CCG_elem_co(const CCGKey *UNUSED(key), CCGElem *elem)
{
return (float *)elem;
}
BLI_INLINE float *CCG_elem_no(const CCGKey *key, CCGElem *elem)
{
BLI_assert(key->has_normals);
return (float *)((char *)elem + key->normal_offset);
}
BLI_INLINE float *CCG_elem_mask(const CCGKey *key, CCGElem *elem)
{
BLI_assert(key->has_mask);
return (float *)((char *)elem + (key->mask_offset));
}
BLI_INLINE CCGElem *CCG_elem_offset(const CCGKey *key, CCGElem *elem, int offset)
{
return (CCGElem *)(((char *)elem) + key->elem_size * offset);
}
BLI_INLINE CCGElem *CCG_grid_elem(const CCGKey *key, CCGElem *elem, int x, int y)
{
// BLI_assert(x < key->grid_size && y < key->grid_size);
return CCG_elem_offset(key, elem, (y * key->grid_size + x));
}
BLI_INLINE float *CCG_grid_elem_co(const CCGKey *key, CCGElem *elem, int x, int y)
{
return CCG_elem_co(key, CCG_grid_elem(key, elem, x, y));
}
BLI_INLINE float *CCG_grid_elem_no(const CCGKey *key, CCGElem *elem, int x, int y)
{
return CCG_elem_no(key, CCG_grid_elem(key, elem, x, y));
}
BLI_INLINE float *CCG_grid_elem_mask(const CCGKey *key, CCGElem *elem, int x, int y)
{
return CCG_elem_mask(key, CCG_grid_elem(key, elem, x, y));
}
BLI_INLINE float *CCG_elem_offset_co(const CCGKey *key, CCGElem *elem, int offset)
{
return CCG_elem_co(key, CCG_elem_offset(key, elem, offset));
}
BLI_INLINE float *CCG_elem_offset_no(const CCGKey *key, CCGElem *elem, int offset)
{
return CCG_elem_no(key, CCG_elem_offset(key, elem, offset));
}
BLI_INLINE float *CCG_elem_offset_mask(const CCGKey *key, CCGElem *elem, int offset)
{
return CCG_elem_mask(key, CCG_elem_offset(key, elem, offset));
}
BLI_INLINE CCGElem *CCG_elem_next(const CCGKey *key, CCGElem *elem)
{
return CCG_elem_offset(key, elem, 1);
}
#ifdef __cplusplus
}
#endif
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