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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_attribute_math.hh"
#include "BKE_brush.h"
#include "BKE_bvhutils.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_geometry_set.hh"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_sample.hh"
#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 "UI_interface.h"
#include "WM_api.h"
namespace blender::ed::sculpt_paint {
struct SlideCurveInfo {
/** Index of the curve to slide. */
int curve_i;
/** A weight based on the initial distance to the brush. */
float radius_falloff;
};
struct SlideInfo {
/** The transform used for the curves below (e.g. for symmetry). */
float4x4 brush_transform;
Vector<SlideCurveInfo> curves_to_slide;
};
class SlideOperation : public CurvesSculptStrokeOperation {
private:
/** Last mouse position. */
float2 brush_pos_last_re_;
/** Information about which curves to slide. This is initialized when the brush starts. */
Vector<SlideInfo> slide_info_;
friend struct SlideOperationExecutor;
public:
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
/**
* 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 SlideOperationExecutor {
SlideOperation *self_ = nullptr;
CurvesSculptCommonContext ctx_;
const CurvesSculpt *curves_sculpt_ = nullptr;
const Brush *brush_ = nullptr;
float brush_radius_base_re_;
float brush_radius_factor_;
float brush_strength_;
Object *object_ = nullptr;
Curves *curves_id_ = nullptr;
CurvesGeometry *curves_ = nullptr;
Object *surface_ob_ = nullptr;
Mesh *surface_ = nullptr;
Span<MLoopTri> surface_looptris_;
VArraySpan<float2> surface_uv_map_;
VArray<float> curve_factors_;
VArray<float> point_factors_;
Vector<int64_t> selected_curve_indices_;
IndexMask curve_selection_;
float2 brush_pos_prev_re_;
float2 brush_pos_re_;
float2 brush_pos_diff_re_;
CurvesSurfaceTransforms transforms_;
BVHTreeFromMesh surface_bvh_;
SlideOperationExecutor(const bContext &C) : ctx_(C)
{
}
void execute(SlideOperation &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_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
return;
}
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_ = brush_strength_get(*ctx_.scene, *brush_, stroke_extension);
curve_factors_ = get_curves_selection(*curves_id_);
point_factors_ = get_point_selection(*curves_id_);
curve_selection_ = retrieve_selected_curves(*curves_id_, selected_curve_indices_);
brush_pos_prev_re_ = self_->brush_pos_last_re_;
brush_pos_re_ = stroke_extension.mouse_position;
brush_pos_diff_re_ = brush_pos_re_ - brush_pos_prev_re_;
BLI_SCOPED_DEFER([&]() { self_->brush_pos_last_re_ = brush_pos_re_; });
transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
surface_ob_ = curves_id_->surface;
surface_ = static_cast<Mesh *>(surface_ob_->data);
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 (curves_id_->surface_uv_map != nullptr) {
MeshComponent surface_component;
surface_component.replace(surface_, GeometryOwnershipType::ReadOnly);
surface_uv_map_ = surface_component
.attribute_try_get_for_read(curves_id_->surface_uv_map,
ATTR_DOMAIN_CORNER)
.typed<float2>();
}
if (stroke_extension.is_first) {
const Vector<float4x4> brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_->symmetry));
for (const float4x4 &brush_transform : brush_transforms) {
this->detect_curves_to_slide(brush_transform);
}
return;
}
this->slide_projected();
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 detect_curves_to_slide(const float4x4 &brush_transform)
{
const float4x4 brush_transform_inv = brush_transform.inverted();
const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
const float brush_radius_sq_re = pow2f(brush_radius_re);
const Span<float3> positions_cu = curves_->positions();
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
self_->slide_info_.append({brush_transform});
Vector<SlideCurveInfo> &curves_to_slide = self_->slide_info_.last().curves_to_slide;
/* Find curves in brush radius that should be moved. */
for (const int curve_i : curve_selection_) {
const int first_point_i = curves_->offsets()[curve_i];
const float3 &first_pos_cu = brush_transform_inv * positions_cu[first_point_i];
float2 first_pos_re;
ED_view3d_project_float_v2_m4(ctx_.region, first_pos_cu, first_pos_re, projection.values);
const float dist_to_brush_sq_re = math::distance_squared(first_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 radius_falloff = BKE_brush_curve_strength(
brush_, dist_to_brush_re, brush_radius_re);
curves_to_slide.append({curve_i, radius_falloff});
}
}
void slide_projected()
{
MutableSpan<float3> positions_cu = curves_->positions_for_write();
MutableSpan<float2> surface_uv_coords;
if (!surface_uv_map_.is_empty()) {
surface_uv_coords = curves_->surface_uv_coords_for_write();
}
float4x4 projection;
ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
for (const SlideInfo &slide_info : self_->slide_info_) {
const float4x4 &brush_transform = slide_info.brush_transform;
const float4x4 brush_transform_inv = brush_transform.inverted();
const Span<SlideCurveInfo> curves_to_slide = slide_info.curves_to_slide;
threading::parallel_for(curves_to_slide.index_range(), 256, [&](const IndexRange range) {
for (const SlideCurveInfo &curve_slide_info : curves_to_slide.slice(range)) {
const int curve_i = curve_slide_info.curve_i;
const IndexRange points = curves_->points_for_curve(curve_i);
const int first_point_i = points.first();
const float3 old_first_pos_cu = brush_transform_inv * positions_cu[first_point_i];
float2 old_first_pos_re;
ED_view3d_project_float_v2_m4(
ctx_.region, old_first_pos_cu, old_first_pos_re, projection.values);
const float first_point_weight = brush_strength_ * curve_slide_info.radius_falloff;
/* Slide root position in region space and then project it back onto the surface. */
const float2 new_first_pos_re = old_first_pos_re +
first_point_weight * brush_pos_diff_re_;
float3 ray_start_wo, ray_end_wo;
ED_view3d_win_to_segment_clipped(ctx_.depsgraph,
ctx_.region,
ctx_.v3d,
new_first_pos_re,
ray_start_wo,
ray_end_wo,
true);
const float3 ray_start_su = transforms_.world_to_surface * ray_start_wo;
const float3 ray_end_su = transforms_.world_to_surface * ray_end_wo;
const float3 ray_direction_su = math::normalize(ray_end_su - ray_start_su);
BVHTreeRayHit hit;
hit.dist = FLT_MAX;
hit.index = -1;
BLI_bvhtree_ray_cast(surface_bvh_.tree,
ray_start_su,
ray_direction_su,
0.0f,
&hit,
surface_bvh_.raycast_callback,
&surface_bvh_);
if (hit.index == -1) {
continue;
}
const int looptri_index = hit.index;
const float3 attached_pos_su = hit.co;
const float3 attached_pos_cu = transforms_.surface_to_curves * attached_pos_su;
const float3 pos_offset_cu = brush_transform * (attached_pos_cu - old_first_pos_cu);
/* Update positions. The first point doesn't have an additional weight here, because then
* it wouldn't be attached to the surface anymore. */
positions_cu[first_point_i] += pos_offset_cu;
for (const int point_i : points.drop_front(1)) {
const float weight = point_factors_[point_i];
positions_cu[point_i] += weight * pos_offset_cu;
}
/* Update surface attachment information if necessary. */
if (!surface_uv_map_.is_empty()) {
const MLoopTri &looptri = surface_looptris_[looptri_index];
const float3 bary_coord = bke::mesh_surface_sample::compute_bary_coord_in_triangle(
*surface_, looptri, attached_pos_su);
const float2 &uv0 = surface_uv_map_[looptri.tri[0]];
const float2 &uv1 = surface_uv_map_[looptri.tri[1]];
const float2 &uv2 = surface_uv_map_[looptri.tri[2]];
const float2 uv = attribute_math::mix3(bary_coord, uv0, uv1, uv2);
surface_uv_coords[curve_i] = uv;
}
}
});
}
}
};
void SlideOperation::on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension)
{
SlideOperationExecutor executor{C};
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_slide_operation()
{
return std::make_unique<SlideOperation>();
}
} // namespace blender::ed::sculpt_paint
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