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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <algorithm>
#include "curves_sculpt_intern.hh"
#include "BLI_float4x4.hh"
#include "BLI_index_mask_ops.hh"
#include "BLI_kdtree.h"
#include "BLI_rand.hh"
#include "BLI_vector.hh"
#include "PIL_time.h"
#include "DEG_depsgraph.h"
#include "BKE_attribute_math.hh"
#include "BKE_brush.h"
#include "BKE_bvhutils.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_paint.h"
#include "DNA_brush_enums.h"
#include "DNA_brush_types.h"
#include "DNA_curves_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "WM_api.h"
/**
* The code below uses a suffix naming convention to indicate the coordinate space:
* cu: Local space of the curves object that is being edited.
* wo: World space.
* re: 2D coordinates within the region.
*/
namespace blender::ed::sculpt_paint {
using blender::bke::CurvesGeometry;
class DeleteOperation : public CurvesSculptStrokeOperation {
private:
float2 brush_pos_prev_re_;
CurvesBrush3D brush_3d_;
friend struct DeleteOperationExecutor;
public:
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
struct DeleteOperationExecutor {
DeleteOperation *self_ = nullptr;
const Depsgraph *depsgraph_ = nullptr;
const Scene *scene_ = nullptr;
ARegion *region_ = nullptr;
const View3D *v3d_ = nullptr;
const RegionView3D *rv3d_ = nullptr;
Object *object_ = nullptr;
Curves *curves_id_ = nullptr;
CurvesGeometry *curves_ = nullptr;
const CurvesSculpt *curves_sculpt_ = nullptr;
const Brush *brush_ = nullptr;
float brush_radius_re_;
float2 brush_pos_re_;
float2 brush_pos_prev_re_;
float4x4 curves_to_world_mat_;
float4x4 world_to_curves_mat_;
void execute(DeleteOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
{
BLI_SCOPED_DEFER([&]() { self.brush_pos_prev_re_ = stroke_extension.mouse_position; });
self_ = &self;
depsgraph_ = CTX_data_depsgraph_pointer(&C);
scene_ = CTX_data_scene(&C);
object_ = CTX_data_active_object(&C);
region_ = CTX_wm_region(&C);
v3d_ = CTX_wm_view3d(&C);
rv3d_ = CTX_wm_region_view3d(&C);
curves_id_ = static_cast<Curves *>(object_->data);
curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
curves_sculpt_ = scene_->toolsettings->curves_sculpt;
brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
brush_radius_re_ = BKE_brush_size_get(scene_, brush_);
brush_pos_re_ = stroke_extension.mouse_position;
brush_pos_prev_re_ = stroke_extension.is_first ? stroke_extension.mouse_position :
self.brush_pos_prev_re_;
curves_to_world_mat_ = object_->obmat;
world_to_curves_mat_ = curves_to_world_mat_.inverted();
const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
brush_->falloff_shape);
if (stroke_extension.is_first) {
if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->initialize_spherical_brush_reference_point();
}
}
Array<bool> curves_to_delete(curves_->curves_num(), false);
if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
this->delete_projected_with_symmetry(curves_to_delete);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->delete_spherical_with_symmetry(curves_to_delete);
}
else {
BLI_assert_unreachable();
}
Vector<int64_t> indices;
const IndexMask mask = index_mask_ops::find_indices_based_on_predicate(
curves_->curves_range(), 4096, indices, [&](const int curve_i) {
return curves_to_delete[curve_i];
});
curves_->remove_curves(mask);
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(region_);
}
void delete_projected_with_symmetry(MutableSpan<bool> curves_to_delete)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->delete_projected(brush_transform, curves_to_delete);
}
}
void delete_projected(const float4x4 &brush_transform, MutableSpan<bool> curves_to_delete)
{
const float4x4 brush_transform_inv = brush_transform.inverted();
float4x4 projection;
ED_view3d_ob_project_mat_get(rv3d_, object_, projection.values);
Span<float3> positions_cu = curves_->positions();
threading::parallel_for(curves_->curves_range(), 512, [&](IndexRange curve_range) {
for (const int curve_i : curve_range) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int segment_i : IndexRange(points.size() - 1)) {
const float3 pos1_cu = brush_transform_inv * positions_cu[points[segment_i]];
const float3 pos2_cu = brush_transform_inv * positions_cu[points[segment_i + 1]];
float2 pos1_re, pos2_re;
ED_view3d_project_float_v2_m4(region_, pos1_cu, pos1_re, projection.values);
ED_view3d_project_float_v2_m4(region_, pos2_cu, pos2_re, projection.values);
const float dist = dist_seg_seg_v2(pos1_re, pos2_re, brush_pos_prev_re_, brush_pos_re_);
if (dist <= brush_radius_re_) {
curves_to_delete[curve_i] = true;
break;
}
}
}
});
}
void delete_spherical_with_symmetry(MutableSpan<bool> curves_to_delete)
{
float4x4 projection;
ED_view3d_ob_project_mat_get(rv3d_, object_, projection.values);
float3 brush_start_wo, brush_end_wo;
ED_view3d_win_to_3d(v3d_,
region_,
curves_to_world_mat_ * self_->brush_3d_.position_cu,
brush_pos_prev_re_,
brush_start_wo);
ED_view3d_win_to_3d(v3d_,
region_,
curves_to_world_mat_ * self_->brush_3d_.position_cu,
brush_pos_re_,
brush_end_wo);
const float3 brush_start_cu = world_to_curves_mat_ * brush_start_wo;
const float3 brush_end_cu = world_to_curves_mat_ * brush_end_wo;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->delete_spherical(
brush_transform * brush_start_cu, brush_transform * brush_end_cu, curves_to_delete);
}
}
void delete_spherical(const float3 &brush_start_cu,
const float3 &brush_end_cu,
MutableSpan<bool> curves_to_delete)
{
Span<float3> positions_cu = curves_->positions();
const float brush_radius_cu = self_->brush_3d_.radius_cu;
const float brush_radius_sq_cu = pow2f(brush_radius_cu);
threading::parallel_for(curves_->curves_range(), 512, [&](IndexRange curve_range) {
for (const int curve_i : curve_range) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int segment_i : IndexRange(points.size() - 1)) {
const float3 pos1_cu = positions_cu[points[segment_i]];
const float3 pos2_cu = positions_cu[points[segment_i] + 1];
float3 closest_segment_cu, closest_brush_cu;
isect_seg_seg_v3(pos1_cu,
pos2_cu,
brush_start_cu,
brush_end_cu,
closest_segment_cu,
closest_brush_cu);
const float distance_to_brush_sq_cu = math::distance_squared(closest_segment_cu,
closest_brush_cu);
if (distance_to_brush_sq_cu > brush_radius_sq_cu) {
continue;
}
curves_to_delete[curve_i] = true;
break;
}
}
});
}
void initialize_spherical_brush_reference_point()
{
std::optional<CurvesBrush3D> brush_3d = sample_curves_3d_brush(
*depsgraph_, *region_, *v3d_, *rv3d_, *object_, brush_pos_re_, brush_radius_re_);
if (brush_3d.has_value()) {
self_->brush_3d_ = *brush_3d;
}
}
};
void DeleteOperation::on_stroke_extended(const bContext &C,
const StrokeExtension &stroke_extension)
{
DeleteOperationExecutor executor;
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_delete_operation()
{
return std::make_unique<DeleteOperation>();
}
} // namespace blender::ed::sculpt_paint
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