Comb brush parallel reduce D14376
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Authored by Hans Goudey (HooglyBoogly) on Mar 23 2022, 5:01 PM.

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	const BrushPositionCandidate best_candidate = threading::parallel_reduce(
	curves.curves_range(),
	128,
	BrushPositionCandidate(),
	[&](IndexRange curves_range, const BrushPositionCandidate &init) {
	BrushPositionCandidate result = init;
	for (const int curve_i : curves_range) {
	const IndexRange points = curves.range_for_curve(curve_i);
	const int tot_segments = points.size() - 1;

	for (const int segment_i : IndexRange(tot_segments)) {
	const float3 &p1_cu = positions[points[segment_i]];
	const float3 &p2_cu = positions[points[segment_i] + 1];

	float2 p1_re, p2_re;
	ED_view3d_project_float_v2_m4(&region, p1_cu, p1_re, projection.values);
	ED_view3d_project_float_v2_m4(&region, p2_cu, p2_re, projection.values);

	float2 closest_re;
	const float lambda = closest_to_line_segment_v2(
	closest_re, brush_pos_re, p1_re, p2_re);

	const float3 closest_cu = math::interpolate(p1_cu, p2_cu, lambda);
	const float depth_sq_cu = math::distance_squared(ray_start_cu, closest_cu);
	if (depth_sq_cu > max_depth_sq_cu) {
	continue;
	}

	const float distance_sq_re = math::distance_squared(brush_pos_re, closest_re);

	BrushPositionCandidate candidate;
	candidate.position_cu = closest_cu;
	candidate.depth_sq_cu = depth_sq_cu;
	candidate.distance_sq_re = distance_sq_re;

	update_if_better(result, candidate);
	}
	}
	return result;
	},
	[&](const BrushPositionCandidate &a, const BrushPositionCandidate &b) {
	return is_better_candidate(a, b) ? b : a;
	});

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