261 lines
9.9 KiB
C++
261 lines
9.9 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "BKE_brush.hh"
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#include "BKE_context.hh"
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#include "BKE_crazyspace.hh"
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#include "ED_screen.hh"
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#include "ED_view3d.hh"
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#include "DEG_depsgraph.hh"
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#include "DNA_brush_types.h"
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#include "WM_api.hh"
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#include "BLI_enumerable_thread_specific.hh"
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#include "BLI_task.hh"
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#include "curves_sculpt_intern.hh"
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namespace blender::ed::sculpt_paint {
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class SmoothOperation : public CurvesSculptStrokeOperation {
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private:
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/** Only used when a 3D brush is used. */
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CurvesBrush3D brush_3d_;
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friend struct SmoothOperationExecutor;
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public:
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void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
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};
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/**
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* Utility class that actually executes the update when the stroke is updated. That's useful
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* because it avoids passing a very large number of parameters between functions.
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*/
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struct SmoothOperationExecutor {
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SmoothOperation *self_ = nullptr;
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CurvesSculptCommonContext ctx_;
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Object *object_ = nullptr;
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Curves *curves_id_ = nullptr;
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CurvesGeometry *curves_ = nullptr;
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VArray<float> point_factors_;
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IndexMaskMemory selected_curve_memory_;
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IndexMask curve_selection_;
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const CurvesSculpt *curves_sculpt_ = nullptr;
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const Brush *brush_ = nullptr;
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float brush_radius_base_re_;
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float brush_radius_factor_;
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float brush_strength_;
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float2 brush_pos_re_;
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CurvesSurfaceTransforms transforms_;
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SmoothOperationExecutor(const bContext &C) : ctx_(C) {}
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void execute(SmoothOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
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{
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UNUSED_VARS(C, stroke_extension);
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self_ = &self;
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object_ = CTX_data_active_object(&C);
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curves_id_ = static_cast<Curves *>(object_->data);
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curves_ = &curves_id_->geometry.wrap();
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if (curves_->curves_num() == 0) {
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return;
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}
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curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
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brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
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brush_radius_base_re_ = BKE_brush_size_get(ctx_.scene, brush_);
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brush_radius_factor_ = brush_radius_factor(*brush_, stroke_extension);
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brush_strength_ = brush_strength_get(*ctx_.scene, *brush_, stroke_extension);
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brush_pos_re_ = stroke_extension.mouse_position;
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point_factors_ = *curves_->attributes().lookup_or_default<float>(
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".selection", bke::AttrDomain::Point, 1.0f);
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curve_selection_ = curves::retrieve_selected_curves(*curves_id_, selected_curve_memory_);
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transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
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const eBrushFalloffShape falloff_shape = eBrushFalloffShape(brush_->falloff_shape);
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if (stroke_extension.is_first) {
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if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
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self.brush_3d_ = *sample_curves_3d_brush(*ctx_.depsgraph,
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*ctx_.region,
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*ctx_.v3d,
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*ctx_.rv3d,
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*object_,
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brush_pos_re_,
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brush_radius_base_re_);
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}
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}
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Array<float> point_smooth_factors(curves_->points_num(), 0.0f);
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if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
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this->find_projected_smooth_factors_with_symmetry(point_smooth_factors);
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}
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else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
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this->find_spherical_smooth_factors_with_symmetry(point_smooth_factors);
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}
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else {
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BLI_assert_unreachable();
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}
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this->smooth(point_smooth_factors);
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curves_->tag_positions_changed();
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DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
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WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
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ED_region_tag_redraw(ctx_.region);
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}
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void find_projected_smooth_factors_with_symmetry(MutableSpan<float> r_point_smooth_factors)
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{
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const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
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eCurvesSymmetryType(curves_id_->symmetry));
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for (const float4x4 &brush_transform : symmetry_brush_transforms) {
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this->find_projected_smooth_factors(brush_transform, r_point_smooth_factors);
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}
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}
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void find_projected_smooth_factors(const float4x4 &brush_transform,
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MutableSpan<float> r_point_smooth_factors)
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{
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const float4x4 brush_transform_inv = math::invert(brush_transform);
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const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
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const float brush_radius_sq_re = pow2f(brush_radius_re);
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const float4x4 projection = ED_view3d_ob_project_mat_get(ctx_.rv3d, object_);
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const bke::crazyspace::GeometryDeformation deformation =
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bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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curve_selection_.foreach_index(GrainSize(256), [&](const int curve_i) {
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const IndexRange points = points_by_curve[curve_i];
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for (const int point_i : points) {
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const float3 &pos_cu = math::transform_point(brush_transform_inv,
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deformation.positions[point_i]);
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const float2 pos_re = ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, projection);
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const float dist_to_brush_sq_re = math::distance_squared(pos_re, brush_pos_re_);
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if (dist_to_brush_sq_re > brush_radius_sq_re) {
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continue;
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}
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const float dist_to_brush_re = std::sqrt(dist_to_brush_sq_re);
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const float radius_falloff = BKE_brush_curve_strength(
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brush_, dist_to_brush_re, brush_radius_re);
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/* Used to make the brush easier to use. Otherwise a strength of 1 would be way too
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* large. */
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const float weight_factor = 0.1f;
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const float weight = weight_factor * brush_strength_ * radius_falloff *
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point_factors_[point_i];
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math::max_inplace(r_point_smooth_factors[point_i], weight);
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}
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});
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}
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void find_spherical_smooth_factors_with_symmetry(MutableSpan<float> r_point_smooth_factors)
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{
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float3 brush_pos_wo;
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ED_view3d_win_to_3d(
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ctx_.v3d,
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ctx_.region,
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math::transform_point(transforms_.curves_to_world, self_->brush_3d_.position_cu),
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brush_pos_re_,
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brush_pos_wo);
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const float3 brush_pos_cu = math::transform_point(transforms_.world_to_curves, brush_pos_wo);
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const float brush_radius_cu = self_->brush_3d_.radius_cu * brush_radius_factor_;
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const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
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eCurvesSymmetryType(curves_id_->symmetry));
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for (const float4x4 &brush_transform : symmetry_brush_transforms) {
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this->find_spherical_smooth_factors(math::transform_point(brush_transform, brush_pos_cu),
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brush_radius_cu,
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r_point_smooth_factors);
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}
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}
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void find_spherical_smooth_factors(const float3 &brush_pos_cu,
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const float brush_radius_cu,
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MutableSpan<float> r_point_smooth_factors)
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{
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const float brush_radius_sq_cu = pow2f(brush_radius_cu);
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const bke::crazyspace::GeometryDeformation deformation =
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bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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curve_selection_.foreach_index(GrainSize(256), [&](const int curve_i) {
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const IndexRange points = points_by_curve[curve_i];
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for (const int point_i : points) {
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const float3 &pos_cu = deformation.positions[point_i];
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const float dist_to_brush_sq_cu = math::distance_squared(pos_cu, brush_pos_cu);
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if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
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continue;
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}
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const float dist_to_brush_cu = std::sqrt(dist_to_brush_sq_cu);
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const float radius_falloff = BKE_brush_curve_strength(
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brush_, dist_to_brush_cu, brush_radius_cu);
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/* Used to make the brush easier to use. Otherwise a strength of 1 would be way too
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* large. */
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const float weight_factor = 0.1f;
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const float weight = weight_factor * brush_strength_ * radius_falloff *
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point_factors_[point_i];
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math::max_inplace(r_point_smooth_factors[point_i], weight);
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}
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});
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}
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void smooth(const Span<float> point_smooth_factors)
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{
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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MutableSpan<float3> positions = curves_->positions_for_write();
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curve_selection_.foreach_segment(GrainSize(256), [&](const IndexMaskSegment segment) {
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Vector<float3> old_positions;
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for (const int curve_i : segment) {
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const IndexRange points = points_by_curve[curve_i];
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old_positions.clear();
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old_positions.extend(positions.slice(points));
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for (const int i : IndexRange(points.size()).drop_front(1).drop_back(1)) {
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const int point_i = points[i];
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const float smooth_factor = point_smooth_factors[point_i];
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if (smooth_factor == 0.0f) {
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continue;
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}
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/* Move towards the middle of the neighboring points. */
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const float3 old_pos = old_positions[i];
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const float3 &prev_pos = old_positions[i - 1];
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const float3 &next_pos = old_positions[i + 1];
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const float3 goal_pos = math::midpoint(prev_pos, next_pos);
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const float3 new_pos = math::interpolate(old_pos, goal_pos, smooth_factor);
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positions[point_i] = new_pos;
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}
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}
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});
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}
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};
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void SmoothOperation::on_stroke_extended(const bContext &C,
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const StrokeExtension &stroke_extension)
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{
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SmoothOperationExecutor executor{C};
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executor.execute(*this, C, stroke_extension);
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}
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std::unique_ptr<CurvesSculptStrokeOperation> new_smooth_operation()
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{
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return std::make_unique<SmoothOperation>();
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}
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} // namespace blender::ed::sculpt_paint
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