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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <algorithm>
#include <numeric>
#include "BLI_memory_utils.hh"
#include "BLI_task.hh"
#include "DNA_brush_types.h"
#include "BKE_brush.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "DEG_depsgraph.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "WM_api.h"
#include "curves_sculpt_intern.hh"
/**
* 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 bke::CurvesGeometry;
class SelectionPaintOperation : public CurvesSculptStrokeOperation {
private:
bool use_select_;
bool clear_selection_;
CurvesBrush3D brush_3d_;
friend struct SelectionPaintOperationExecutor;
public:
SelectionPaintOperation(const bool use_select, const bool clear_selection)
: use_select_(use_select), clear_selection_(clear_selection)
{
}
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
struct SelectionPaintOperationExecutor {
SelectionPaintOperation *self_ = nullptr;
CurvesSculptCommonContext ctx_;
Object *object_ = nullptr;
Curves *curves_id_ = nullptr;
CurvesGeometry *curves_ = nullptr;
const Brush *brush_ = nullptr;
float brush_radius_base_re_;
float brush_radius_factor_;
float brush_strength_;
float selection_goal_;
float2 brush_pos_re_;
CurvesSculptTransforms transforms_;
SelectionPaintOperationExecutor(const bContext &C) : ctx_(C)
{
}
void execute(SelectionPaintOperation &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);
curves_id_->flag |= CV_SCULPT_SELECTION_ENABLED;
if (curves_->curves_num() == 0) {
return;
}
brush_ = BKE_paint_brush_for_read(&ctx_.scene->toolsettings->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_);
brush_pos_re_ = stroke_extension.mouse_position;
if (self.clear_selection_) {
if (stroke_extension.is_first) {
if (curves_id_->selection_domain == ATTR_DOMAIN_POINT) {
curves_->selection_point_float_for_write().fill(0.0f);
}
else if (curves_id_->selection_domain == ATTR_DOMAIN_CURVE) {
curves_->selection_curve_float_for_write().fill(0.0f);
}
}
}
transforms_ = CurvesSculptTransforms(*object_, curves_id_->surface);
const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
brush_->falloff_shape);
selection_goal_ = self_->use_select_ ? 1.0f : 0.0f;
if (stroke_extension.is_first) {
if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->initialize_spherical_brush_reference_point();
}
}
if (curves_id_->selection_domain == ATTR_DOMAIN_POINT) {
MutableSpan<float> selection = curves_->selection_point_float_for_write();
if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
this->paint_point_selection_projected_with_symmetry(selection);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->paint_point_selection_spherical_with_symmetry(selection);
}
}
else {
MutableSpan<float> selection = curves_->selection_curve_float_for_write();
if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
this->paint_curve_selection_projected_with_symmetry(selection);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->paint_curve_selection_spherical_with_symmetry(selection);
}
}
/* Use #ID_RECALC_GEOMETRY instead of #ID_RECALC_SELECT because
* selection is handled as a generic attribute for now. */
DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
ctx_.rv3d->rflag &= ~RV3D_PAINTING;
ED_region_tag_redraw(ctx_.region);
}
void paint_point_selection_projected_with_symmetry(MutableSpan<float> selection)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->paint_point_selection_projected(brush_transform, selection);
}
}
void paint_point_selection_projected(const float4x4 &brush_transform,
MutableSpan<float> selection)
{
const float4x4 brush_transform_inv = brush_transform.inverted();
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
Span<float3> positions_cu = curves_->positions();
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(curves_->points_range(), 1024, [&](const IndexRange point_range) {
for (const int point_i : point_range) {
const float3 pos_cu = brush_transform_inv * positions_cu[point_i];
/* Find the position of the point in screen space. */
float2 pos_re;
ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
const float distance_to_brush_sq_re = math::distance_squared(pos_re, brush_pos_re_);
if (distance_to_brush_sq_re > brush_radius_sq_re) {
/* Ignore the point because it's too far away. */
continue;
}
const float distance_to_brush_re = std::sqrt(distance_to_brush_sq_re);
/* A falloff that is based on how far away the point is from the stroke. */
const float radius_falloff = BKE_brush_curve_strength(
brush_, distance_to_brush_re, brush_radius_re);
/* Combine the falloff and brush strength. */
const float weight = brush_strength_ * radius_falloff;
selection[point_i] = math::interpolate(selection[point_i], selection_goal_, weight);
}
});
}
void paint_point_selection_spherical_with_symmetry(MutableSpan<float> selection)
{
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
float3 brush_wo;
ED_view3d_win_to_3d(ctx_.v3d,
ctx_.region,
transforms_.curves_to_world * self_->brush_3d_.position_cu,
brush_pos_re_,
brush_wo);
const float3 brush_cu = transforms_.world_to_curves * brush_wo;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->paint_point_selection_spherical(selection, brush_transform * brush_cu);
}
}
void paint_point_selection_spherical(MutableSpan<float> selection, const float3 &brush_cu)
{
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_->points_range(), 1024, [&](const IndexRange point_range) {
for (const int i : point_range) {
const float3 pos_old_cu = positions_cu[i];
/* Compute distance to the brush. */
const float distance_to_brush_sq_cu = math::distance_squared(pos_old_cu, brush_cu);
if (distance_to_brush_sq_cu > brush_radius_sq_cu) {
/* Ignore the point because it's too far away. */
continue;
}
const float distance_to_brush_cu = std::sqrt(distance_to_brush_sq_cu);
/* A falloff that is based on how far away the point is from the stroke. */
const float radius_falloff = BKE_brush_curve_strength(
brush_, distance_to_brush_cu, brush_radius_cu);
/* Combine the falloff and brush strength. */
const float weight = brush_strength_ * radius_falloff;
selection[i] = math::interpolate(selection[i], selection_goal_, weight);
}
});
}
void paint_curve_selection_projected_with_symmetry(MutableSpan<float> selection)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->paint_curve_selection_projected(brush_transform, selection);
}
}
void paint_curve_selection_projected(const float4x4 &brush_transform,
MutableSpan<float> selection)
{
const 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(curves_->curves_range(), 1024, [&](const IndexRange curves_range) {
for (const int curve_i : curves_range) {
const float max_weight = threading::parallel_reduce(
curves_->points_for_curve(curve_i).drop_back(1),
1024,
0.0f,
[&](const IndexRange segment_range, const float init) {
float max_weight = init;
for (const int segment_i : segment_range) {
const float3 pos1_cu = brush_transform_inv * positions_cu[segment_i];
const float3 pos2_cu = brush_transform_inv * positions_cu[segment_i + 1];
float2 pos1_re;
float2 pos2_re;
ED_view3d_project_float_v2_m4(ctx_.region, pos1_cu, pos1_re, projection.values);
ED_view3d_project_float_v2_m4(ctx_.region, pos2_cu, pos2_re, projection.values);
const float distance_sq_re = dist_squared_to_line_segment_v2(
brush_pos_re_, pos1_re, pos2_re);
if (distance_sq_re > brush_radius_sq_re) {
continue;
}
const float radius_falloff = BKE_brush_curve_strength(
brush_, std::sqrt(distance_sq_re), brush_radius_re);
const float weight = brush_strength_ * radius_falloff;
max_weight = std::max(max_weight, weight);
}
return max_weight;
},
[](float a, float b) { return std::max(a, b); });
selection[curve_i] = math::interpolate(selection[curve_i], selection_goal_, max_weight);
}
});
}
void paint_curve_selection_spherical_with_symmetry(MutableSpan<float> selection)
{
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
float3 brush_wo;
ED_view3d_win_to_3d(ctx_.v3d,
ctx_.region,
transforms_.curves_to_world * self_->brush_3d_.position_cu,
brush_pos_re_,
brush_wo);
const float3 brush_cu = transforms_.world_to_curves * brush_wo;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->paint_curve_selection_spherical(selection, brush_transform * brush_cu);
}
}
void paint_curve_selection_spherical(MutableSpan<float> selection, const float3 &brush_cu)
{
const 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(), 1024, [&](const IndexRange curves_range) {
for (const int curve_i : curves_range) {
const float max_weight = threading::parallel_reduce(
curves_->points_for_curve(curve_i).drop_back(1),
1024,
0.0f,
[&](const IndexRange segment_range, const float init) {
float max_weight = init;
for (const int segment_i : segment_range) {
const float3 &pos1_cu = positions_cu[segment_i];
const float3 &pos2_cu = positions_cu[segment_i + 1];
const float distance_sq_cu = dist_squared_to_line_segment_v3(
brush_cu, pos1_cu, pos2_cu);
if (distance_sq_cu > brush_radius_sq_cu) {
continue;
}
const float radius_falloff = BKE_brush_curve_strength(
brush_, std::sqrt(distance_sq_cu), brush_radius_cu);
const float weight = brush_strength_ * radius_falloff;
max_weight = std::max(max_weight, weight);
}
return max_weight;
},
[](float a, float b) { return std::max(a, b); });
selection[curve_i] = math::interpolate(selection[curve_i], selection_goal_, max_weight);
}
});
}
void initialize_spherical_brush_reference_point()
{
std::optional<CurvesBrush3D> brush_3d = sample_curves_3d_brush(*ctx_.depsgraph,
*ctx_.region,
*ctx_.v3d,
*ctx_.rv3d,
*object_,
brush_pos_re_,
brush_radius_base_re_);
if (brush_3d.has_value()) {
self_->brush_3d_ = *brush_3d;
}
}
};
void SelectionPaintOperation::on_stroke_extended(const bContext &C,
const StrokeExtension &stroke_extension)
{
SelectionPaintOperationExecutor executor{C};
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_selection_paint_operation(
const BrushStrokeMode brush_mode, const bContext &C)
{
Scene &scene = *CTX_data_scene(&C);
Brush &brush = *BKE_paint_brush(&scene.toolsettings->curves_sculpt->paint);
const bool use_select = ELEM(brush_mode, BRUSH_STROKE_INVERT) ==
((brush.flag & BRUSH_DIR_IN) != 0);
const bool clear_selection = use_select && brush_mode != BRUSH_STROKE_SMOOTH;
return std::make_unique<SelectionPaintOperation>(use_select, clear_selection);
}
} // namespace blender::ed::sculpt_paint
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