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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/editors/sculpt_paint/paint_vertex_weight_utils.c
* \ingroup edsculpt
*
* Intended for use by `paint_vertex.c` & `paint_vertex_weight_ops.c`.
*/
#include "MEM_guardedalloc.h"
#include "BLI_listbase.h"
#include "BLI_math.h"
#include "BLI_string_utils.h"
#include "DNA_armature_types.h"
#include "DNA_mesh_types.h"
#include "DNA_scene_types.h"
#include "DNA_brush_types.h"
#include "DNA_object_types.h"
#include "BKE_action.h"
#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"
#include "BKE_object_deform.h"
#include "BKE_report.h"
#include "WM_api.h"
#include "WM_types.h"
#include "paint_intern.h" /* own include */
/* -------------------------------------------------------------------- */
/** \name Weight Paint Sanity Checks
* \{ */
/* ensure we have data on wpaint start, add if needed */
bool ED_wpaint_ensure_data(
bContext *C, struct ReportList *reports,
enum eWPaintFlag flag, struct WPaintVGroupIndex *vgroup_index)
{
Scene *scene = CTX_data_scene(C);
Object *ob = CTX_data_active_object(C);
Mesh *me = BKE_mesh_from_object(ob);
if (vgroup_index) {
vgroup_index->active = -1;
vgroup_index->mirror = -1;
}
if (scene->obedit) {
return false;
}
if (me == NULL || me->totpoly == 0) {
return false;
}
/* if nothing was added yet, we make dverts and a vertex deform group */
if (!me->dvert) {
BKE_object_defgroup_data_create(&me->id);
WM_event_add_notifier(C, NC_GEOM | ND_DATA, me);
}
/* this happens on a Bone select, when no vgroup existed yet */
if (ob->actdef <= 0) {
Object *modob;
if ((modob = modifiers_isDeformedByArmature(ob))) {
Bone *actbone = ((bArmature *)modob->data)->act_bone;
if (actbone) {
bPoseChannel *pchan = BKE_pose_channel_find_name(modob->pose, actbone->name);
if (pchan) {
bDeformGroup *dg = defgroup_find_name(ob, pchan->name);
if (dg == NULL) {
dg = BKE_object_defgroup_add_name(ob, pchan->name); /* sets actdef */
}
else {
int actdef = 1 + BLI_findindex(&ob->defbase, dg);
BLI_assert(actdef >= 0);
ob->actdef = actdef;
}
}
}
}
}
if (BLI_listbase_is_empty(&ob->defbase)) {
BKE_object_defgroup_add(ob);
}
/* ensure we don't try paint onto an invalid group */
if (ob->actdef <= 0) {
BKE_report(reports, RPT_WARNING, "No active vertex group for painting, aborting");
return false;
}
if (vgroup_index) {
vgroup_index->active = ob->actdef - 1;
}
if (flag & WPAINT_ENSURE_MIRROR) {
if (me->editflag & ME_EDIT_MIRROR_X) {
int mirror = ED_wpaint_mirror_vgroup_ensure(ob, ob->actdef - 1);
if (vgroup_index) {
vgroup_index->mirror = mirror;
}
}
}
return true;
}
/** \} */
/* mirror_vgroup is set to -1 when invalid */
int ED_wpaint_mirror_vgroup_ensure(Object *ob, const int vgroup_active)
{
bDeformGroup *defgroup = BLI_findlink(&ob->defbase, vgroup_active);
if (defgroup) {
int mirrdef;
char name_flip[MAXBONENAME];
BLI_string_flip_side_name(name_flip, defgroup->name, false, sizeof(name_flip));
mirrdef = defgroup_name_index(ob, name_flip);
if (mirrdef == -1) {
if (BKE_defgroup_new(ob, name_flip)) {
mirrdef = BLI_listbase_count(&ob->defbase) - 1;
}
}
/* curdef should never be NULL unless this is
* a lamp and BKE_object_defgroup_add_name fails */
return mirrdef;
}
return -1;
}
/* -------------------------------------------------------------------- */
/** \name Weight Blending Modes
* \{ */
BLI_INLINE float wval_blend(const float weight, const float paintval, const float alpha)
{
const float talpha = min_ff(alpha, 1.0f); /* blending with values over 1 doesn't make sense */
return (paintval * talpha) + (weight * (1.0f - talpha));
}
BLI_INLINE float wval_add(const float weight, const float paintval, const float alpha)
{
return weight + (paintval * alpha);
}
BLI_INLINE float wval_sub(const float weight, const float paintval, const float alpha)
{
return weight - (paintval * alpha);
}
BLI_INLINE float wval_mul(const float weight, const float paintval, const float alpha)
{ /* first mul, then blend the fac */
return ((1.0f - alpha) + (alpha * paintval)) * weight;
}
BLI_INLINE float wval_lighten(const float weight, const float paintval, const float alpha)
{
return (weight < paintval) ? wval_blend(weight, paintval, alpha) : weight;
}
BLI_INLINE float wval_darken(const float weight, const float paintval, const float alpha)
{
return (weight > paintval) ? wval_blend(weight, paintval, alpha) : weight;
}
/* vpaint has 'vpaint_blend_tool' */
/* result is not clamped from [0-1] */
float ED_wpaint_blend_tool(
const int tool,
/* dw->weight */
const float weight,
const float paintval, const float alpha)
{
switch (tool) {
case PAINT_BLEND_MIX:
case PAINT_BLEND_AVERAGE:
case PAINT_BLEND_SMEAR:
case PAINT_BLEND_BLUR: return wval_blend(weight, paintval, alpha);
case PAINT_BLEND_ADD: return wval_add(weight, paintval, alpha);
case PAINT_BLEND_SUB: return wval_sub(weight, paintval, alpha);
case PAINT_BLEND_MUL: return wval_mul(weight, paintval, alpha);
case PAINT_BLEND_LIGHTEN: return wval_lighten(weight, paintval, alpha);
case PAINT_BLEND_DARKEN: return wval_darken(weight, paintval, alpha);
default:
BLI_assert(0);
return 0.0f;
}
}
/** \} */
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