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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_attribute_math.hh"
#include "BKE_brush.h"
#include "BKE_bvhutils.h"
#include "BKE_context.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "DEG_depsgraph.h"
#include "DNA_brush_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "WM_api.h"
#include "BLI_length_parameterize.hh"
#include "curves_sculpt_intern.hh"
namespace blender::ed::sculpt_paint {
class PuffOperation : public CurvesSculptStrokeOperation {
private:
/** Only used when a 3D brush is used. */
CurvesBrush3D brush_3d_;
/** Length of each segment indexed by the index of the first point in the segment. */
Array<float> segment_lengths_cu_;
friend struct PuffOperationExecutor;
public:
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
static float3 compute_surface_point_normal(const MLoopTri &looptri,
const float3 &bary_coord,
const Span<float3> corner_normals)
{
const int l0 = looptri.tri[0];
const int l1 = looptri.tri[1];
const int l2 = looptri.tri[2];
const float3 &l0_normal = corner_normals[l0];
const float3 &l1_normal = corner_normals[l1];
const float3 &l2_normal = corner_normals[l2];
const float3 normal = math::normalize(
attribute_math::mix3(bary_coord, l0_normal, l1_normal, l2_normal));
return normal;
}
/**
* Utility class that actually executes the update when the stroke is updated. That's useful
* because it avoids passing a very large number of parameters between functions.
*/
struct PuffOperationExecutor {
PuffOperation *self_ = nullptr;
CurvesSculptCommonContext ctx_;
Object *object_ = nullptr;
Curves *curves_id_ = nullptr;
CurvesGeometry *curves_ = nullptr;
VArray<float> point_factors_;
Vector<int64_t> selected_curve_indices_;
IndexMask curve_selection_;
const CurvesSculpt *curves_sculpt_ = nullptr;
const Brush *brush_ = nullptr;
float brush_radius_base_re_;
float brush_radius_factor_;
float brush_strength_;
float2 brush_pos_re_;
eBrushFalloffShape falloff_shape_;
CurvesSurfaceTransforms transforms_;
Object *surface_ob_ = nullptr;
Mesh *surface_ = nullptr;
Span<MLoopTri> surface_looptris_;
Span<float3> corner_normals_su_;
BVHTreeFromMesh surface_bvh_;
PuffOperationExecutor(const bContext &C) : ctx_(C)
{
}
void execute(PuffOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
{
UNUSED_VARS(C, stroke_extension);
self_ = &self;
object_ = CTX_data_active_object(&C);
curves_id_ = static_cast<Curves *>(object_->data);
curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
if (curves_->curves_num() == 0) {
return;
}
if (curves_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
return;
}
curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
brush_radius_base_re_ = BKE_brush_size_get(ctx_.scene, brush_);
brush_radius_factor_ = brush_radius_factor(*brush_, stroke_extension);
brush_strength_ = brush_strength_get(*ctx_.scene, *brush_, stroke_extension);
brush_pos_re_ = stroke_extension.mouse_position;
point_factors_ = get_point_selection(*curves_id_);
curve_selection_ = retrieve_selected_curves(*curves_id_, selected_curve_indices_);
falloff_shape_ = static_cast<eBrushFalloffShape>(brush_->falloff_shape);
surface_ob_ = curves_id_->surface;
surface_ = static_cast<Mesh *>(surface_ob_->data);
transforms_ = CurvesSurfaceTransforms(*object_, surface_ob_);
if (!CustomData_has_layer(&surface_->ldata, CD_NORMAL)) {
BKE_mesh_calc_normals_split(surface_);
}
corner_normals_su_ = {
reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_->ldata, CD_NORMAL)),
surface_->totloop};
BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
surface_looptris_ = {BKE_mesh_runtime_looptri_ensure(surface_),
BKE_mesh_runtime_looptri_len(surface_)};
if (stroke_extension.is_first) {
this->initialize_segment_lengths();
if (falloff_shape_ == PAINT_FALLOFF_SHAPE_SPHERE) {
self.brush_3d_ = *sample_curves_3d_brush(*ctx_.depsgraph,
*ctx_.region,
*ctx_.v3d,
*ctx_.rv3d,
*object_,
brush_pos_re_,
brush_radius_base_re_);
}
}
Array<float> curve_weights(curve_selection_.size(), 0.0f);
if (falloff_shape_ == PAINT_FALLOFF_SHAPE_TUBE) {
this->find_curve_weights_projected_with_symmetry(curve_weights);
}
else if (falloff_shape_ == PAINT_FALLOFF_SHAPE_SPHERE) {
this->find_curves_weights_spherical_with_symmetry(curve_weights);
}
else {
BLI_assert_unreachable();
}
this->puff(curve_weights);
this->restore_segment_lengths();
curves_->tag_positions_changed();
DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
ED_region_tag_redraw(ctx_.region);
}
void find_curve_weights_projected_with_symmetry(MutableSpan<float> r_curve_weights)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->find_curve_weights_projected(brush_transform, r_curve_weights);
}
}
void find_curve_weights_projected(const float4x4 &brush_transform,
MutableSpan<float> r_curve_weights)
{
Span<float3> positions_cu = curves_->positions();
const float4x4 brush_transform_inv = brush_transform.inverted();
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
const float brush_radius_sq_re = pow2f(brush_radius_re);
threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
for (const int curve_selection_i : range) {
const int curve_i = curve_selection_[curve_selection_i];
const IndexRange points = curves_->points_for_curve(curve_i);
const float3 first_pos_cu = brush_transform_inv * positions_cu[points[0]];
float2 prev_pos_re;
ED_view3d_project_float_v2_m4(ctx_.region, first_pos_cu, prev_pos_re, projection.values);
for (const int point_i : points.drop_front(1)) {
const float3 pos_cu = brush_transform_inv * positions_cu[point_i];
float2 pos_re;
ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
BLI_SCOPED_DEFER([&]() { prev_pos_re = pos_re; });
const float dist_to_brush_sq_re = dist_squared_to_line_segment_v2(
brush_pos_re_, prev_pos_re, pos_re);
if (dist_to_brush_sq_re > brush_radius_sq_re) {
continue;
}
const float dist_to_brush_re = std::sqrt(dist_to_brush_sq_re);
const float radius_falloff = BKE_brush_curve_strength(
brush_, dist_to_brush_re, brush_radius_re);
const float weight = radius_falloff;
math::max_inplace(r_curve_weights[curve_selection_i], weight);
}
}
});
}
void find_curves_weights_spherical_with_symmetry(MutableSpan<float> r_curve_weights)
{
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
float3 brush_pos_wo;
ED_view3d_win_to_3d(ctx_.v3d,
ctx_.region,
transforms_.curves_to_world * self_->brush_3d_.position_cu,
brush_pos_re_,
brush_pos_wo);
const float3 brush_pos_cu = transforms_.world_to_curves * brush_pos_wo;
const float brush_radius_cu = self_->brush_3d_.radius_cu * brush_radius_factor_;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->find_curves_weights_spherical(
brush_transform * brush_pos_cu, brush_radius_cu, r_curve_weights);
}
}
void find_curves_weights_spherical(const float3 &brush_pos_cu,
const float brush_radius_cu,
MutableSpan<float> r_curve_weights)
{
const Span<float3> positions_cu = curves_->positions();
const float brush_radius_sq_cu = pow2f(brush_radius_cu);
threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
for (const int curve_selection_i : range) {
const int curve_i = curve_selection_[curve_selection_i];
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int point_i : points.drop_front(1)) {
const float3 &prev_pos_cu = positions_cu[point_i - 1];
const float3 &pos_cu = positions_cu[point_i];
const float dist_to_brush_sq_cu = dist_squared_to_line_segment_v3(
brush_pos_cu, prev_pos_cu, pos_cu);
if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
continue;
}
const float dist_to_brush_cu = std::sqrt(dist_to_brush_sq_cu);
const float radius_falloff = BKE_brush_curve_strength(
brush_, dist_to_brush_cu, brush_radius_cu);
const float weight = radius_falloff;
math::max_inplace(r_curve_weights[curve_selection_i], weight);
}
}
});
}
void puff(const Span<float> curve_weights)
{
BLI_assert(curve_weights.size() == curve_selection_.size());
MutableSpan<float3> positions_cu = curves_->positions_for_write();
threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
Vector<float> accumulated_lengths_cu;
for (const int curve_selection_i : range) {
const int curve_i = curve_selection_[curve_selection_i];
const IndexRange points = curves_->points_for_curve(curve_i);
const int first_point_i = points[0];
const float3 first_pos_cu = positions_cu[first_point_i];
const float3 first_pos_su = transforms_.curves_to_surface * first_pos_cu;
/* Find the nearest position on the surface. The curve will be aligned to the normal of
* that point. */
BVHTreeNearest nearest;
nearest.dist_sq = FLT_MAX;
BLI_bvhtree_find_nearest(surface_bvh_.tree,
first_pos_su,
&nearest,
surface_bvh_.nearest_callback,
&surface_bvh_);
const MLoopTri &looptri = surface_looptris_[nearest.index];
const float3 closest_pos_su = nearest.co;
const float3 &v0_su = surface_->mvert[surface_->mloop[looptri.tri[0]].v].co;
const float3 &v1_su = surface_->mvert[surface_->mloop[looptri.tri[1]].v].co;
const float3 &v2_su = surface_->mvert[surface_->mloop[looptri.tri[2]].v].co;
float3 bary_coords;
interp_weights_tri_v3(bary_coords, v0_su, v1_su, v2_su, closest_pos_su);
const float3 normal_su = compute_surface_point_normal(
looptri, bary_coords, corner_normals_su_);
const float3 normal_cu = math::normalize(transforms_.surface_to_curves_normal * normal_su);
accumulated_lengths_cu.reinitialize(points.size() - 1);
length_parameterize::accumulate_lengths<float3>(
positions_cu.slice(points), false, accumulated_lengths_cu);
/* Align curve to the surface normal while making sure that the curve does not fold up much
* in the process (e.g. when the curve was pointing in the opposite direction before). */
for (const int i : IndexRange(points.size()).drop_front(1)) {
const int point_i = points[i];
const float3 old_pos_cu = positions_cu[point_i];
/* Compute final position of the point. */
const float length_param_cu = accumulated_lengths_cu[i - 1];
const float3 goal_pos_cu = first_pos_cu + length_param_cu * normal_cu;
const float weight = 0.01f * brush_strength_ * point_factors_[point_i] *
curve_weights[curve_selection_i];
float3 new_pos_cu = math::interpolate(old_pos_cu, goal_pos_cu, weight);
/* Make sure the point does not move closer to the root point than it was initially. This
* makes the curve kind of "rotate up". */
const float old_dist_to_root_cu = math::distance(old_pos_cu, first_pos_cu);
const float new_dist_to_root_cu = math::distance(new_pos_cu, first_pos_cu);
if (new_dist_to_root_cu < old_dist_to_root_cu) {
const float3 offset = math::normalize(new_pos_cu - first_pos_cu);
new_pos_cu += (old_dist_to_root_cu - new_dist_to_root_cu) * offset;
}
positions_cu[point_i] = new_pos_cu;
}
}
});
}
void initialize_segment_lengths()
{
const Span<float3> positions_cu = curves_->positions();
self_->segment_lengths_cu_.reinitialize(curves_->points_num());
threading::parallel_for(curves_->curves_range(), 128, [&](const IndexRange range) {
for (const int curve_i : range) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int point_i : points.drop_back(1)) {
const float3 &p1_cu = positions_cu[point_i];
const float3 &p2_cu = positions_cu[point_i + 1];
const float length_cu = math::distance(p1_cu, p2_cu);
self_->segment_lengths_cu_[point_i] = length_cu;
}
}
});
}
void restore_segment_lengths()
{
const Span<float> expected_lengths_cu = self_->segment_lengths_cu_;
MutableSpan<float3> positions_cu = curves_->positions_for_write();
threading::parallel_for(curves_->curves_range(), 256, [&](const IndexRange range) {
for (const int curve_i : range) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int segment_i : points.drop_back(1)) {
const float3 &p1_cu = positions_cu[segment_i];
float3 &p2_cu = positions_cu[segment_i + 1];
const float3 direction = math::normalize(p2_cu - p1_cu);
const float expected_length_cu = expected_lengths_cu[segment_i];
p2_cu = p1_cu + direction * expected_length_cu;
}
}
});
}
};
void PuffOperation::on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension)
{
PuffOperationExecutor executor{C};
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_puff_operation()
{
return std::make_unique<PuffOperation>();
}
} // namespace blender::ed::sculpt_paint
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