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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_vector.hh"
#include "PIL_time.h"
#include "DEG_depsgraph.h"
#include "BKE_brush.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_paint.h"
#include "DNA_brush_enums.h"
#include "DNA_brush_types.h"
#include "DNA_curves_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 prefix naming convention to indicate the coordinate space:
* `cu`: Local space of the curves object that is being edited.
* `su`: Local space of the surface object.
* `wo`: World space.
* `re`: 2D coordinates within the region.
*/
namespace blender::ed::sculpt_paint {
class PinchOperation : public CurvesSculptStrokeOperation {
private:
bool invert_pinch_;
Array<float> segment_lengths_cu_;
/** Only used when a 3D brush is used. */
CurvesBrush3D brush_3d_;
friend struct PinchOperationExecutor;
public:
PinchOperation(const bool invert_pinch) : invert_pinch_(invert_pinch)
{
}
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
struct PinchOperationExecutor {
PinchOperation *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_;
CurvesSculptTransforms transforms_;
const CurvesSculpt *curves_sculpt_ = nullptr;
const Brush *brush_ = nullptr;
float brush_radius_base_re_;
float brush_radius_factor_;
float brush_strength_;
float invert_factor_;
float2 brush_pos_re_;
PinchOperationExecutor(const bContext &C) : ctx_(C)
{
}
void execute(PinchOperation &self, const bContext &C, const StrokeExtension &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;
}
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_ = BKE_brush_alpha_get(ctx_.scene, brush_);
invert_factor_ = self_->invert_pinch_ ? -1.0f : 1.0f;
transforms_ = CurvesSculptTransforms(*object_, curves_id_->surface);
point_factors_ = get_point_selection(*curves_id_);
curve_selection_ = retrieve_selected_curves(*curves_id_, selected_curve_indices_);
brush_pos_re_ = stroke_extension.mouse_position;
const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
brush_->falloff_shape);
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<bool> changed_curves(curves_->curves_num(), false);
if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
this->pinch_projected_with_symmetry(changed_curves);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->pinch_spherical_with_symmetry(changed_curves);
}
else {
BLI_assert_unreachable();
}
this->restore_segment_lengths(changed_curves);
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 pinch_projected_with_symmetry(MutableSpan<bool> r_changed_curves)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->pinch_projected(brush_transform, r_changed_curves);
}
}
void pinch_projected(const float4x4 &brush_transform, MutableSpan<bool> r_changed_curves)
{
const float4x4 brush_transform_inv = brush_transform.inverted();
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
MutableSpan<float3> positions_cu = curves_->positions_for_write();
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_i : curve_selection_.slice(range)) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int point_i : points.drop_front(1)) {
const float3 old_pos_cu = brush_transform_inv * positions_cu[point_i];
float2 old_pos_re;
ED_view3d_project_float_v2_m4(ctx_.region, old_pos_cu, old_pos_re, projection.values);
const float dist_to_brush_sq_re = math::distance_squared(old_pos_re, brush_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 t = safe_divide(dist_to_brush_re, brush_radius_base_re_);
const float radius_falloff = t * BKE_brush_curve_strength(brush_, t, 1.0f);
const float weight = invert_factor_ * 0.1f * brush_strength_ * radius_falloff *
point_factors_[point_i];
const float2 new_pos_re = math::interpolate(old_pos_re, brush_pos_re_, weight);
const float3 old_pos_wo = transforms_.curves_to_world * old_pos_cu;
float3 new_pos_wo;
ED_view3d_win_to_3d(ctx_.v3d, ctx_.region, old_pos_wo, new_pos_re, new_pos_wo);
const float3 new_pos_cu = transforms_.world_to_curves * new_pos_wo;
positions_cu[point_i] = brush_transform * new_pos_cu;
r_changed_curves[curve_i] = true;
}
}
});
}
void pinch_spherical_with_symmetry(MutableSpan<bool> r_changed_curves)
{
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->pinch_spherical(brush_transform * brush_pos_cu, brush_radius_cu, r_changed_curves);
}
}
void pinch_spherical(const float3 &brush_pos_cu,
const float brush_radius_cu,
MutableSpan<bool> r_changed_curves)
{
MutableSpan<float3> positions_cu = curves_->positions_for_write();
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_i : curve_selection_.slice(range)) {
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int point_i : points.drop_front(1)) {
const float3 old_pos_cu = positions_cu[point_i];
const float dist_to_brush_sq_cu = math::distance_squared(old_pos_cu, brush_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 t = safe_divide(dist_to_brush_cu, brush_radius_cu);
const float radius_falloff = t * BKE_brush_curve_strength(brush_, t, 1.0f);
const float weight = invert_factor_ * 0.1f * brush_strength_ * radius_falloff *
point_factors_[point_i];
const float3 new_pos_cu = math::interpolate(old_pos_cu, brush_pos_cu, weight);
positions_cu[point_i] = new_pos_cu;
r_changed_curves[curve_i] = true;
}
}
});
}
void initialize_segment_lengths()
{
const Span<float3> positions_cu = curves_->positions();
self_->segment_lengths_cu_.reinitialize(curves_->points_num());
threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
for (const int curve_i : curve_selection_.slice(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<bool> changed_curves)
{
const Span<float> expected_lengths_cu = self_->segment_lengths_cu_;
MutableSpan<float3> positions_cu = curves_->positions_for_write();
threading::parallel_for(changed_curves.index_range(), 256, [&](const IndexRange range) {
for (const int curve_i : range) {
if (!changed_curves[curve_i]) {
continue;
}
const IndexRange points = curves_->points_for_curve(curve_i);
for (const int segment_i : IndexRange(points.size() - 1)) {
const float3 &p1_cu = positions_cu[points[segment_i]];
float3 &p2_cu = positions_cu[points[segment_i] + 1];
const float3 direction = math::normalize(p2_cu - p1_cu);
const float expected_length_cu = expected_lengths_cu[points[segment_i]];
p2_cu = p1_cu + direction * expected_length_cu;
}
}
});
}
};
void PinchOperation::on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension)
{
PinchOperationExecutor executor{C};
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_pinch_operation(const BrushStrokeMode brush_mode,
const bContext &C)
{
const Scene &scene = *CTX_data_scene(&C);
const Brush &brush = *BKE_paint_brush_for_read(&scene.toolsettings->curves_sculpt->paint);
const bool invert_pinch = (brush_mode == BRUSH_STROKE_INVERT) !=
((brush.flag & BRUSH_DIR_IN) != 0);
return std::make_unique<PinchOperation>(invert_pinch);
}
} // namespace blender::ed::sculpt_paint
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