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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/editmesh_tangent.c
* \ingroup bke
*/
#include "BLI_math.h"
#include "BLI_task.h"
#include "BKE_DerivedMesh.h"
#include "BKE_mesh.h"
#include "BKE_mesh_tangent.h" /* for utility functions */
#include "BKE_editmesh.h"
#include "BKE_editmesh_tangent.h"
#include "MEM_guardedalloc.h"
/* interface */
#include "mikktspace.h"
/** \name Tangent Space Calculation
* \{ */
/* Necessary complexity to handle looptri's as quads for correct tangents */
#define USE_LOOPTRI_DETECT_QUADS
typedef struct {
const float (*precomputedFaceNormals)[3];
const float (*precomputedLoopNormals)[3];
const BMLoop *(*looptris)[3];
int cd_loop_uv_offset; /* texture coordinates */
const float (*orco)[3];
float (*tangent)[4]; /* destination */
int numTessFaces;
#ifdef USE_LOOPTRI_DETECT_QUADS
/* map from 'fake' face index to looptri,
* quads will point to the first looptri of the quad */
const int *face_as_quad_map;
int num_face_as_quad_map;
#endif
} SGLSLEditMeshToTangent;
#ifdef USE_LOOPTRI_DETECT_QUADS
/* seems weak but only used on quads */
static const BMLoop *bm_loop_at_face_index(const BMFace *f, int vert_index)
{
const BMLoop *l = BM_FACE_FIRST_LOOP(f);
while (vert_index--) {
l = l->next;
}
return l;
}
#endif
static int emdm_ts_GetNumFaces(const SMikkTSpaceContext *pContext)
{
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
#ifdef USE_LOOPTRI_DETECT_QUADS
return pMesh->num_face_as_quad_map;
#else
return pMesh->numTessFaces;
#endif
}
static int emdm_ts_GetNumVertsOfFace(const SMikkTSpaceContext *pContext, const int face_num)
{
#ifdef USE_LOOPTRI_DETECT_QUADS
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
if (pMesh->face_as_quad_map) {
const BMLoop **lt = pMesh->looptris[pMesh->face_as_quad_map[face_num]];
if (lt[0]->f->len == 4) {
return 4;
}
}
return 3;
#else
UNUSED_VARS(pContext, face_num);
return 3;
#endif
}
static void emdm_ts_GetPosition(
const SMikkTSpaceContext *pContext, float r_co[3],
const int face_num, const int vert_index)
{
//assert(vert_index >= 0 && vert_index < 4);
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
const BMLoop **lt;
const BMLoop *l;
#ifdef USE_LOOPTRI_DETECT_QUADS
if (pMesh->face_as_quad_map) {
lt = pMesh->looptris[pMesh->face_as_quad_map[face_num]];
if (lt[0]->f->len == 4) {
l = bm_loop_at_face_index(lt[0]->f, vert_index);
goto finally;
}
/* fall through to regular triangle */
}
else {
lt = pMesh->looptris[face_num];
}
#else
lt = pMesh->looptris[face_num];
#endif
l = lt[vert_index];
const float *co;
finally:
co = l->v->co;
copy_v3_v3(r_co, co);
}
static void emdm_ts_GetTextureCoordinate(
const SMikkTSpaceContext *pContext, float r_uv[2],
const int face_num, const int vert_index)
{
//assert(vert_index >= 0 && vert_index < 4);
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
const BMLoop **lt;
const BMLoop *l;
#ifdef USE_LOOPTRI_DETECT_QUADS
if (pMesh->face_as_quad_map) {
lt = pMesh->looptris[pMesh->face_as_quad_map[face_num]];
if (lt[0]->f->len == 4) {
l = bm_loop_at_face_index(lt[0]->f, vert_index);
goto finally;
}
/* fall through to regular triangle */
}
else {
lt = pMesh->looptris[face_num];
}
#else
lt = pMesh->looptris[face_num];
#endif
l = lt[vert_index];
finally:
if (pMesh->cd_loop_uv_offset != -1) {
const float *uv = BM_ELEM_CD_GET_VOID_P(l, pMesh->cd_loop_uv_offset);
copy_v2_v2(r_uv, uv);
}
else {
const float *orco = pMesh->orco[BM_elem_index_get(l->v)];
map_to_sphere(&r_uv[0], &r_uv[1], orco[0], orco[1], orco[2]);
}
}
static void emdm_ts_GetNormal(
const SMikkTSpaceContext *pContext, float r_no[3],
const int face_num, const int vert_index)
{
//assert(vert_index >= 0 && vert_index < 4);
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
const BMLoop **lt;
const BMLoop *l;
#ifdef USE_LOOPTRI_DETECT_QUADS
if (pMesh->face_as_quad_map) {
lt = pMesh->looptris[pMesh->face_as_quad_map[face_num]];
if (lt[0]->f->len == 4) {
l = bm_loop_at_face_index(lt[0]->f, vert_index);
goto finally;
}
/* fall through to regular triangle */
}
else {
lt = pMesh->looptris[face_num];
}
#else
lt = pMesh->looptris[face_num];
#endif
l = lt[vert_index];
finally:
if (pMesh->precomputedLoopNormals) {
copy_v3_v3(r_no, pMesh->precomputedLoopNormals[BM_elem_index_get(l)]);
}
else if (BM_elem_flag_test(l->f, BM_ELEM_SMOOTH) == 0) { /* flat */
if (pMesh->precomputedFaceNormals) {
copy_v3_v3(r_no, pMesh->precomputedFaceNormals[BM_elem_index_get(l->f)]);
}
else {
copy_v3_v3(r_no, l->f->no);
}
}
else {
copy_v3_v3(r_no, l->v->no);
}
}
static void emdm_ts_SetTSpace(
const SMikkTSpaceContext *pContext, const float fvTangent[3], const float fSign,
const int face_num, const int vert_index)
{
//assert(vert_index >= 0 && vert_index < 4);
SGLSLEditMeshToTangent *pMesh = pContext->m_pUserData;
const BMLoop **lt;
const BMLoop *l;
#ifdef USE_LOOPTRI_DETECT_QUADS
if (pMesh->face_as_quad_map) {
lt = pMesh->looptris[pMesh->face_as_quad_map[face_num]];
if (lt[0]->f->len == 4) {
l = bm_loop_at_face_index(lt[0]->f, vert_index);
goto finally;
}
/* fall through to regular triangle */
}
else {
lt = pMesh->looptris[face_num];
}
#else
lt = pMesh->looptris[face_num];
#endif
l = lt[vert_index];
float *pRes;
finally:
pRes = pMesh->tangent[BM_elem_index_get(l)];
copy_v3_v3(pRes, fvTangent);
pRes[3] = fSign;
}
static void emDM_calc_loop_tangents_thread(TaskPool * __restrict UNUSED(pool), void *taskdata, int UNUSED(threadid))
{
struct SGLSLEditMeshToTangent *mesh2tangent = taskdata;
/* new computation method */
{
SMikkTSpaceContext sContext = {NULL};
SMikkTSpaceInterface sInterface = {NULL};
sContext.m_pUserData = mesh2tangent;
sContext.m_pInterface = &sInterface;
sInterface.m_getNumFaces = emdm_ts_GetNumFaces;
sInterface.m_getNumVerticesOfFace = emdm_ts_GetNumVertsOfFace;
sInterface.m_getPosition = emdm_ts_GetPosition;
sInterface.m_getTexCoord = emdm_ts_GetTextureCoordinate;
sInterface.m_getNormal = emdm_ts_GetNormal;
sInterface.m_setTSpaceBasic = emdm_ts_SetTSpace;
/* 0 if failed */
genTangSpaceDefault(&sContext);
}
}
/**
* \see #BKE_mesh_calc_loop_tangent, same logic but used arrays instead of #BMesh data.
*
* \note This function is not so normal, its using `bm->ldata` as input, but output's to `dm->loopData`.
* This is done because #CD_TANGENT is cache data used only for drawing.
*/
void BKE_editmesh_loop_tangent_calc(
BMEditMesh *em, bool calc_active_tangent,
const char (*tangent_names)[MAX_NAME], int tangent_names_len,
const float (*poly_normals)[3],
const float (*loop_normals)[3],
const float (*vert_orco)[3],
/* result */
CustomData *loopdata_out,
const uint loopdata_out_len,
char *tangent_mask_curr_p)
{
BMesh *bm = em->bm;
BLI_assert(CustomData_number_of_layers(&bm->ldata, CD_MLOOPUV) != 0);
int act_uv_n = -1;
int ren_uv_n = -1;
bool calc_act = false;
bool calc_ren = false;
char act_uv_name[MAX_NAME];
char ren_uv_name[MAX_NAME];
char tangent_mask = 0;
char tangent_mask_curr = *tangent_mask_curr_p;
BKE_mesh_calc_loop_tangent_step_0(
&bm->ldata, calc_active_tangent, tangent_names, tangent_names_len,
&calc_act, &calc_ren, &act_uv_n, &ren_uv_n, act_uv_name, ren_uv_name, &tangent_mask);
if ((tangent_mask_curr | tangent_mask) != tangent_mask_curr) {
for (int i = 0; i < tangent_names_len; i++)
if (tangent_names[i][0])
BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, tangent_names[i]);
if (calc_act && act_uv_name[0])
BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, act_uv_name);
if (calc_ren && ren_uv_name[0])
BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, ren_uv_name);
int totface = em->tottri;
#ifdef USE_LOOPTRI_DETECT_QUADS
int num_face_as_quad_map;
int *face_as_quad_map = NULL;
/* map faces to quads */
if (em->tottri != bm->totface) {
/* over alloc, since we dont know how many ngon or quads we have */
/* map fake face index to looptri */
face_as_quad_map = MEM_mallocN(sizeof(int) * totface, __func__);
int i, j;
for (i = 0, j = 0; j < totface; i++, j++) {
face_as_quad_map[i] = j;
/* step over all quads */
if (em->looptris[j][0]->f->len == 4) {
j++; /* skips the nest looptri */
}
}
num_face_as_quad_map = i;
}
else {
num_face_as_quad_map = totface;
}
#endif
/* Calculation */
if (em->tottri != 0) {
TaskScheduler *scheduler = BLI_task_scheduler_get();
TaskPool *task_pool;
task_pool = BLI_task_pool_create(scheduler, NULL);
tangent_mask_curr = 0;
/* Calculate tangent layers */
SGLSLEditMeshToTangent data_array[MAX_MTFACE];
int index = 0;
int n = 0;
CustomData_update_typemap(loopdata_out);
const int tangent_layer_num = CustomData_number_of_layers(loopdata_out, CD_TANGENT);
for (n = 0; n < tangent_layer_num; n++) {
index = CustomData_get_layer_index_n(loopdata_out, CD_TANGENT, n);
BLI_assert(n < MAX_MTFACE);
SGLSLEditMeshToTangent *mesh2tangent = &data_array[n];
mesh2tangent->numTessFaces = em->tottri;
#ifdef USE_LOOPTRI_DETECT_QUADS
mesh2tangent->face_as_quad_map = face_as_quad_map;
mesh2tangent->num_face_as_quad_map = num_face_as_quad_map;
#endif
mesh2tangent->precomputedFaceNormals = poly_normals; /* dm->getPolyDataArray(dm, CD_NORMAL) */
/* Note, we assume we do have tessellated loop normals at this point (in case it is object-enabled),
* have to check this is valid...
*/
mesh2tangent->precomputedLoopNormals = loop_normals;
mesh2tangent->cd_loop_uv_offset = CustomData_get_n_offset(&bm->ldata, CD_MLOOPUV, n);
/* needed for indexing loop-tangents */
int htype_index = BM_LOOP;
if (mesh2tangent->cd_loop_uv_offset == -1) {
mesh2tangent->orco = vert_orco;
if (!mesh2tangent->orco)
continue;
/* needed for orco lookups */
htype_index |= BM_VERT;
}
if (mesh2tangent->precomputedFaceNormals) {
/* needed for face normal lookups */
htype_index |= BM_FACE;
}
BM_mesh_elem_index_ensure(bm, htype_index);
mesh2tangent->looptris = (const BMLoop *(*)[3])em->looptris;
mesh2tangent->tangent = loopdata_out->layers[index].data;
/* Fill the resulting tangent_mask */
int uv_ind = CustomData_get_named_layer_index(
&bm->ldata, CD_MLOOPUV, loopdata_out->layers[index].name);
int uv_start = CustomData_get_layer_index(&bm->ldata, CD_MLOOPUV);
BLI_assert(uv_ind != -1 && uv_start != -1);
BLI_assert(uv_ind - uv_start < MAX_MTFACE);
tangent_mask_curr |= 1 << (uv_ind - uv_start);
BLI_task_pool_push(task_pool, emDM_calc_loop_tangents_thread, mesh2tangent, false, TASK_PRIORITY_LOW);
}
BLI_assert(tangent_mask_curr == tangent_mask);
BLI_task_pool_work_and_wait(task_pool);
BLI_task_pool_free(task_pool);
}
else {
tangent_mask_curr = tangent_mask;
}
#ifdef USE_LOOPTRI_DETECT_QUADS
if (face_as_quad_map) {
MEM_freeN(face_as_quad_map);
}
#undef USE_LOOPTRI_DETECT_QUADS
#endif
}
*tangent_mask_curr_p = tangent_mask_curr;
/* Update active layer index */
int uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, act_uv_n);
int tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[uv_index].name);
CustomData_set_layer_active_index(loopdata_out, CD_TANGENT, tan_index);
/* Update render layer index */
uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, ren_uv_n);
tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[uv_index].name);
CustomData_set_layer_render_index(loopdata_out, CD_TANGENT, tan_index);
}
/** \} */
|