remove layer usage to reduce vram consumption

Plugins/ZShell/Blobs/CMakeLists.txt

@@ -5,6 +5,10 @@ qml_module(ZShell-blobs
 		blobshape.cpp
 		blobrect.cpp
 		blobinvertedrect.cpp
+		blobgroup2.cpp
+		blobshape2.cpp
+		blobrect2.cpp
+		blobinvertedrect2.cpp
 		blobmaterial.cpp
 	LIBRARIES
 		Qt::Quick

Plugins/ZShell/Blobs/blobgroup2.cpp

@@ -0,0 +1,382 @@
+#include "blobgroup2.hpp"
+#include "blobinvertedrect2.hpp"
+#include "blobshape2.hpp"
+
+#include <qsggeometry.h>
+#include <qsgnode.h>
+
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+
+static float cpuSdBox(
+	float px, float py, float cx, float cy, float hw, float hh) {
+	const float dx = std::abs(px - cx) - hw;
+	const float dy = std::abs(py - cy) - hh;
+	const float mdx = std::max(dx, 0.0f);
+	const float mdy = std::max(dy, 0.0f);
+	return std::sqrt(mdx * mdx + mdy * mdy) + std::min(std::max(dx, dy), 0.0f);
+}
+
+static float cpuSmoothstep(float edge0, float edge1, float x) {
+	const float t = std::clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
+	return t * t * (3.0f - 2.0f * t);
+}
+
+static float cornerFillFactor(float sd, float smoothFactor) {
+	const float outside = cpuSmoothstep(0.0f, smoothFactor, sd);
+	const float inside = cpuSmoothstep(0.0f, -smoothFactor, sd);
+	return std::max(outside, inside);
+}
+
+BlobGroup2::BlobGroup2(QQuickItem* parent) : QQuickItem(parent) {
+	setFlag(ItemHasContents);
+}
+
+BlobGroup2::~BlobGroup2() {
+	for (auto* shape : std::as_const(m_shapes))
+		shape->m_group = nullptr;
+	if (m_invertedRect)
+		static_cast<BlobShape2*>(m_invertedRect)->m_group = nullptr;
+}
+
+void BlobGroup2::setSmoothing(qreal s) {
+	if (qFuzzyCompare(m_smoothing, s)) return;
+	m_smoothing = s;
+	emit smoothingChanged();
+	markDirty();
+}
+
+void BlobGroup2::setColor(const QColor& c) {
+	if (m_color == c) return;
+	m_color = c;
+	emit colorChanged();
+	markDirty();
+}
+
+void BlobGroup2::setCornerFill(bool e) {
+	if (m_cornerFill == e) return;
+	m_cornerFill = e;
+	emit cornerFillChanged();
+	markDirty();
+}
+
+void BlobGroup2::setShadowColor(const QColor& c) {
+	if (m_shadowColor == c) return;
+	m_shadowColor = c;
+	emit shadowColorChanged();
+	markDirty();
+}
+
+void BlobGroup2::setShadowRadius(qreal r) {
+	if (qFuzzyCompare(m_shadowRadius, r)) return;
+	m_shadowRadius = r;
+	emit shadowRadiusChanged();
+	markDirty();
+}
+
+void BlobGroup2::addShape(BlobShape2* shape) {
+	if (!shape || m_shapes.contains(shape)) return;
+	m_shapes.append(shape);
+	markDirty();
+}
+
+void BlobGroup2::removeShape(BlobShape2* shape) {
+	m_shapes.removeOne(shape);
+	markDirty();
+}
+
+void BlobGroup2::setInvertedRect(BlobInvertedRect2* rect) {
+	if (m_invertedRect == rect) return;
+	m_invertedRect = rect;
+	markDirty();
+}
+
+void BlobGroup2::clearInvertedRect(BlobInvertedRect2* rect) {
+	if (m_invertedRect != rect) return;
+	m_invertedRect = nullptr;
+	markDirty();
+}
+
+void BlobGroup2::markDirty() {
+	m_physicsUpdated = false;
+	m_dataBuilt = false;
+	// Physics runs during polish, before the render pass. The panel content is
+	// transformed by deformMatrix from QML, so the matrix has to be final for this
+	// frame; building the data in updatePaintNode would let the transform lag one
+	// frame behind the material.
+	polish();
+	update();
+}
+
+void BlobGroup2::updatePolish() {
+	// The group is the only thing that draws, so it also drives the shapes'
+	// physics.
+	ensureDataBuilt();
+}
+
+void BlobGroup2::ensurePhysicsUpdated() {
+	if (m_physicsUpdated) return;
+	m_physicsUpdated = true;
+	for (auto* shape : std::as_const(m_shapes))
+		shape->updatePhysics();
+}
+
+void BlobGroup2::ensureDataBuilt() {
+	if (m_dataBuilt) return;
+	ensurePhysicsUpdated();
+
+	// Physics can request the next frame through markDirty(); the data is
+	// refreshed here anyway, so the flag is set after it runs.
+	m_dataBuilt = true;
+	m_data.rects.clear();
+	m_bounds = QRectF();
+
+	const float smoothFactor = static_cast<float>(m_smoothing);
+	// The same reach the shader uses to decide whether a rect can contribute, plus
+	// the shadow, so every pixel the shader can give a value to is inside the node.
+	const double extent = static_cast<double>(smoothFactor) * 1.5 +
+						  static_cast<double>(m_shadowRadius);
+
+	// Group order, no pruning: the shader sees this list for every pixel.
+	// entryShapes maps a shared entry back to the shape it came from.
+	QVector<BlobShape2*> entryShapes;
+
+	for (auto* shape : std::as_const(m_shapes)) {
+		if (shape->width() <= 0 || shape->height() <= 0) continue;
+		if (static_cast<int>(m_data.rects.size()) >= BlobGroupData::kMaxRects)
+			continue;
+
+		const QPointF scene = shape->mapToScene(QPointF(0, 0));
+		const QMatrix4x4& dm = shape->m_deformMatrix;
+
+		BlobRectData r;
+		r.cx = static_cast<float>(scene.x() + shape->width() / 2.0);
+		r.cy = static_cast<float>(scene.y() + shape->height() / 2.0);
+		r.hw = static_cast<float>(shape->width()) * 0.5f;
+		r.hh = static_cast<float>(shape->height()) * 0.5f;
+		shape->cornerRadii(r.radius);
+		r.offsetX = dm(0, 3);
+		r.offsetY = dm(1, 3);
+
+		const float a = dm(0, 0), b = dm(1, 0);
+		const float c = dm(0, 1), e = dm(1, 1);
+		const float det = a * e - c * b;
+		const float invDet = std::abs(det) > 1e-6f ? 1.0f / det : 1.0f;
+		r.invDeform[0] = e * invDet;
+		r.invDeform[1] = -b * invDet;
+		r.invDeform[2] = -c * invDet;
+		r.invDeform[3] = a * invDet;
+
+		const float halfTr = 0.5f * (a + e);
+		const float halfDiff = 0.5f * (a - e);
+		r.minEig = halfTr - std::sqrt(halfDiff * halfDiff + c * c);
+
+		r.screenHalfX = std::abs(a) * r.hw + std::abs(c) * r.hh;
+		r.screenHalfY = std::abs(b) * r.hw + std::abs(e) * r.hh;
+
+		m_data.rects.append(r);
+		m_bounds = m_bounds.united(QRectF(
+			static_cast<double>(r.cx) + static_cast<double>(r.offsetX) -
+				static_cast<double>(r.screenHalfX) - extent,
+			static_cast<double>(r.cy) + static_cast<double>(r.offsetY) -
+				static_cast<double>(r.screenHalfY) - extent,
+			2.0 * (static_cast<double>(r.screenHalfX) + extent),
+			2.0 * (static_cast<double>(r.screenHalfY) + extent)));
+
+		entryShapes.append(shape);
+	}
+
+	const int count = static_cast<int>(m_data.rects.size());
+
+	// Exclusion gates only the smooth blend.
+	for (int i = 0; i < count; ++i) {
+		int mask = 0;
+		BlobShape2* const si = entryShapes[i];
+		for (int j = 0; j < count; ++j) {
+			if (j == i) continue;
+			BlobShape2* const sj = entryShapes[j];
+			if (si->isExcluded(sj) || sj->isExcluded(si)) mask |= (1 << j);
+		}
+		m_data.rects[i].excludeMask = mask;
+	}
+
+	constexpr float minR = 2.0f;
+	const bool cornerFill = m_cornerFill;
+
+	for (int i = 0; i < count; ++i) {
+		auto& ri = m_data.rects[i];
+		BlobShape2* const si = entryShapes[i];
+		float fTr = 1.0f, fBr = 1.0f, fBl = 1.0f, fTl = 1.0f;
+
+		const float cTrX = ri.cx + ri.hw, cTrY = ri.cy - ri.hh;
+		const float cBrX = ri.cx + ri.hw, cBrY = ri.cy + ri.hh;
+		const float cBlX = ri.cx - ri.hw, cBlY = ri.cy + ri.hh;
+		const float cTlX = ri.cx - ri.hw, cTlY = ri.cy - ri.hh;
+
+		if (cornerFill) {
+			for (int j = 0; j < count; ++j) {
+				if (j == i) continue;
+				if (ri.excludeMask & (1 << j)) continue;
+				BlobShape2* const sj = entryShapes[j];
+				if (si->isCornerExcluded(sj) || sj->isCornerExcluded(si))
+					continue;
+				const auto& rj = m_data.rects[j];
+				fTr = std::min(
+					fTr,
+					cornerFillFactor(
+						cpuSdBox(cTrX, cTrY, rj.cx, rj.cy, rj.hw, rj.hh),
+						smoothFactor));
+				fBr = std::min(
+					fBr,
+					cornerFillFactor(
+						cpuSdBox(cBrX, cBrY, rj.cx, rj.cy, rj.hw, rj.hh),
+						smoothFactor));
+				fBl = std::min(
+					fBl,
+					cornerFillFactor(
+						cpuSdBox(cBlX, cBlY, rj.cx, rj.cy, rj.hw, rj.hh),
+						smoothFactor));
+				fTl = std::min(
+					fTl,
+					cornerFillFactor(
+						cpuSdBox(cTlX, cTlY, rj.cx, rj.cy, rj.hw, rj.hh),
+						smoothFactor));
+			}
+		}
+
+		ri.radius[0] = std::max(ri.radius[0] * fTr, minR);
+		ri.radius[1] = std::max(ri.radius[1] * fBr, minR);
+		ri.radius[2] = std::max(ri.radius[2] * fBl, minR);
+		ri.radius[3] = std::max(ri.radius[3] * fTl, minR);
+	}
+
+	// Inverted rect. The frame term is evaluated for every pixel in the bounds,
+	// so the group flag cannot be gated per shape.
+	if (!m_invertedRect) return;
+
+	auto* inv = static_cast<BlobShape2*>(m_invertedRect);
+	if (inv->width() <= 0 || inv->height() <= 0) return;
+
+	const QPointF invScene = inv->mapToScene(QPointF(0, 0));
+	const float outerCX = static_cast<float>(invScene.x() + inv->width() / 2.0);
+	const float outerCY =
+		static_cast<float>(invScene.y() + inv->height() / 2.0);
+	const float outerHW = static_cast<float>(inv->width()) * 0.5f;
+	const float outerHH = static_cast<float>(inv->height()) * 0.5f;
+
+	const auto* invRect = m_invertedRect;
+	const float innerCX =
+		outerCX + static_cast<float>(
+					  (invRect->borderLeft() - invRect->borderRight()) / 2.0);
+	const float innerCY =
+		outerCY + static_cast<float>(
+					  (invRect->borderTop() - invRect->borderBottom()) / 2.0);
+	const float innerHW =
+		outerHW - static_cast<float>(
+					  (invRect->borderLeft() + invRect->borderRight()) / 2.0);
+	const float innerHH =
+		outerHH - static_cast<float>(
+					  (invRect->borderTop() + invRect->borderBottom()) / 2.0);
+
+	m_data.hasInverted = true;
+	m_data.invertedRadius = static_cast<float>(invRect->radius());
+
+	m_data.invertedOuter[0] = outerCX;
+	m_data.invertedOuter[1] = outerCY;
+	m_data.invertedOuter[2] = outerHW;
+	m_data.invertedOuter[3] = outerHH;
+
+	m_data.invertedInner[0] = innerCX;
+	m_data.invertedInner[1] = innerCY;
+	m_data.invertedInner[2] = innerHW;
+	m_data.invertedInner[3] = innerHH;
+
+	m_bounds = m_bounds.united(QRectF(
+		static_cast<double>(outerCX) - static_cast<double>(outerHW) - extent,
+		static_cast<double>(outerCY) - static_cast<double>(outerHH) - extent,
+		2.0 * (static_cast<double>(outerHW) + extent),
+		2.0 * (static_cast<double>(outerHH) + extent)));
+}
+
+void BlobGroup2::fillMaterial(BlobMaterial* material) {
+	material->m_paddedX = static_cast<float>(m_bounds.x());
+	material->m_paddedY = static_cast<float>(m_bounds.y());
+	material->m_paddedW = static_cast<float>(m_bounds.width());
+	material->m_paddedH = static_cast<float>(m_bounds.height());
+
+	material->m_smoothFactor = static_cast<float>(m_smoothing);
+	// The single group draw has no owner, so the shader skips the ownership test.
+	material->m_myIndex = -2;
+	material->m_color = m_color;
+	material->m_hasInverted = m_data.hasInverted ? 1 : 0;
+	material->m_invertedRadius = data().invertedRadius;
+	memcpy(
+		material->m_invertedOuter,
+		data().invertedOuter,
+		sizeof(data().invertedOuter));
+	memcpy(
+		material->m_invertedInner,
+		data().invertedInner,
+		sizeof(data().invertedInner));
+
+	material->m_shadowRadius = static_cast<float>(m_shadowRadius);
+	material->m_shadowColor[0] = static_cast<float>(m_shadowColor.redF());
+	material->m_shadowColor[1] = static_cast<float>(m_shadowColor.greenF());
+	material->m_shadowColor[2] = static_cast<float>(m_shadowColor.blueF());
+	material->m_shadowColor[3] = static_cast<float>(m_shadowColor.alphaF());
+
+	const int count =
+		static_cast<int>(qMin(data().rects.size(), qsizetype(16)));
+	material->m_rectCount = count;
+	for (int i = 0; i < count; ++i)
+		material->m_rects[i] = data().rects[i];
+}
+
+QSGNode* BlobGroup2::updatePaintNode(QSGNode* oldNode, UpdatePaintNodeData*) {
+	// Data is built during polish. This only covers a render pass that happens
+	// without one.
+	ensureDataBuilt();
+
+	if (m_data.rects.isEmpty() && !m_data.hasInverted) {
+		delete oldNode;
+		return nullptr;
+	}
+
+	auto* node = static_cast<QSGGeometryNode*>(oldNode);
+	if (!node) {
+		node = new QSGGeometryNode;
+
+		auto* geometry =
+			new QSGGeometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4);
+		geometry->setDrawingMode(QSGGeometry::DrawTriangleStrip);
+		node->setGeometry(geometry);
+		node->setFlag(QSGNode::OwnsGeometry);
+
+		auto* material = new BlobMaterial;
+		material->setFlag(QSGMaterial::Blending);
+		node->setMaterial(material);
+		node->setFlag(QSGNode::OwnsMaterial);
+	}
+
+	// The shader evaluates the field at the scene position a vertex maps to, so
+	// the group item itself must not be transformed. The vertex positions are the
+	// bounds in this item's frame; the material carries the same rect in scene
+	// coordinates.
+	auto* v = node->geometry()->vertexDataAsTexturedPoint2D();
+	const QPointF p0 = mapFromScene(m_bounds.topLeft());
+	const QPointF p1 = mapFromScene(m_bounds.bottomRight());
+
+	v[0].set(static_cast<float>(p0.x()), static_cast<float>(p0.y()), 0.0f, 0.0f);
+	v[1].set(static_cast<float>(p1.x()), static_cast<float>(p0.y()), 1.0f, 0.0f);
+	v[2].set(static_cast<float>(p0.x()), static_cast<float>(p1.y()), 0.0f, 1.0f);
+	v[3].set(static_cast<float>(p1.x()), static_cast<float>(p1.y()), 1.0f, 1.0f);
+
+	node->markDirty(QSGNode::DirtyGeometry);
+
+	fillMaterial(static_cast<BlobMaterial*>(node->material()));
+
+	node->markDirty(QSGNode::DirtyMaterial);
+
+	return node;
+}

Plugins/ZShell/Blobs/blobgroup2.hpp

@@ -0,0 +1,128 @@
+#pragma once
+
+#include "blobmaterial.hpp"
+
+#include <qcolor.h>
+#include <qlist.h>
+#include <qobject.h>
+#include <qqmlengine.h>
+#include <qquickitem.h>
+#include <qrect.h>
+#include <qsgnode.h>
+#include <qvector.h>
+
+class BlobShape2;
+class BlobInvertedRect2;
+
+// One shared valuation for a whole group, drawn by one node.
+//
+// The shapes here are data only: they say where the material should be. The group
+// draws a single quad over everything the shader can evaluate, so a pixel cannot
+// be evaluated by one shape and missed by another, and no second draw can
+// disagree with the first. That is what makes overlapping shapes read as one
+// surface - one value, one writer, one alpha per pixel.
+struct BlobGroupData {
+	// The shader reads rectData[80] = 16 entries, and excludeMask is a 32-bit
+	// mask. The shared list is capped at 16, in group order, so the cap is the
+	// same list for every pixel.
+	static constexpr int kMaxRects = 16;
+
+	QVector<BlobRectData> rects;
+	bool hasInverted = false;
+	float invertedRadius = 0;
+	float invertedOuter[4] = {};
+	float invertedInner[4] = {};
+};
+
+class BlobGroup2 : public QQuickItem {
+	Q_OBJECT
+	QML_ELEMENT
+	Q_PROPERTY(
+		qreal smoothing READ smoothing WRITE setSmoothing NOTIFY
+			smoothingChanged)
+	Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)
+	Q_PROPERTY(
+		bool cornerFill READ cornerFill WRITE setCornerFill NOTIFY
+			cornerFillChanged)
+	Q_PROPERTY(
+		QColor shadowColor READ shadowColor WRITE setShadowColor NOTIFY
+			shadowColorChanged)
+	Q_PROPERTY(
+		qreal shadowRadius READ shadowRadius WRITE setShadowRadius NOTIFY
+			shadowRadiusChanged)
+
+	friend class BlobShape2;
+
+	public:
+	explicit BlobGroup2(QQuickItem* parent = nullptr);
+	~BlobGroup2() override;
+
+	[[nodiscard]] qreal smoothing() const { return m_smoothing; }
+
+	void setSmoothing(qreal s);
+
+	[[nodiscard]] QColor color() const { return m_color; }
+
+	void setColor(const QColor& c);
+
+	[[nodiscard]] bool cornerFill() const { return m_cornerFill; }
+
+	void setCornerFill(bool e);
+
+	[[nodiscard]] QColor shadowColor() const { return m_shadowColor; }
+
+	void setShadowColor(const QColor& c);
+
+	[[nodiscard]] qreal shadowRadius() const { return m_shadowRadius; }
+
+	void setShadowRadius(qreal r);
+
+	void addShape(BlobShape2* shape);
+	void removeShape(BlobShape2* shape);
+
+	void setInvertedRect(BlobInvertedRect2* rect);
+	void clearInvertedRect(BlobInvertedRect2* rect);
+
+	[[nodiscard]] const QList<BlobShape2*>& shapes() const { return m_shapes; }
+
+	[[nodiscard]] BlobInvertedRect2* invertedRect() const {
+		return m_invertedRect;
+	}
+
+	[[nodiscard]] const BlobGroupData& data() const { return m_data; }
+
+	// One draw per group, so a change to any shape changes the value for every
+	// pixel. Refresh the whole group.
+	void markDirty();
+
+	signals:
+	void smoothingChanged();
+	void colorChanged();
+	void cornerFillChanged();
+	void shadowColorChanged();
+	void shadowRadiusChanged();
+
+	protected:
+	void updatePolish() override;
+	QSGNode* updatePaintNode(QSGNode* oldNode, UpdatePaintNodeData*) override;
+
+	private:
+	void ensurePhysicsUpdated();
+	void ensureDataBuilt();
+	void fillMaterial(BlobMaterial* material);
+
+	qreal m_smoothing = 32.0;
+	QColor m_color{0x44, 0x88, 0xff};
+	bool m_cornerFill = true;
+	QColor m_shadowColor{0, 0, 0, 128};
+	qreal m_shadowRadius = 0.0;
+	QList<BlobShape2*> m_shapes;
+	BlobInvertedRect2* m_invertedRect = nullptr;
+	bool m_physicsUpdated = false;
+	bool m_dataBuilt = false;
+	BlobGroupData m_data;
+
+	// Scene-space union of what the shader can evaluate for any shape. The node
+	// covers exactly this, so gaps are not possible.
+	QRectF m_bounds;
+};

Plugins/ZShell/Blobs/blobinvertedrect2.cpp

@@ -0,0 +1,44 @@
+#include "blobinvertedrect2.hpp"
+#include "blobgroup2.hpp"
+
+BlobInvertedRect2::BlobInvertedRect2(QQuickItem* parent) : BlobShape2(parent) {}
+
+BlobInvertedRect2::~BlobInvertedRect2() {
+	if (m_group) m_group->clearInvertedRect(this);
+}
+
+void BlobInvertedRect2::setBorderLeft(qreal v) {
+	if (qFuzzyCompare(m_borderLeft, v)) return;
+	m_borderLeft = v;
+	emit borderLeftChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobInvertedRect2::setBorderRight(qreal v) {
+	if (qFuzzyCompare(m_borderRight, v)) return;
+	m_borderRight = v;
+	emit borderRightChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobInvertedRect2::setBorderTop(qreal v) {
+	if (qFuzzyCompare(m_borderTop, v)) return;
+	m_borderTop = v;
+	emit borderTopChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobInvertedRect2::setBorderBottom(qreal v) {
+	if (qFuzzyCompare(m_borderBottom, v)) return;
+	m_borderBottom = v;
+	emit borderBottomChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobInvertedRect2::registerWithGroup() {
+	if (m_group) m_group->setInvertedRect(this);
+}
+
+void BlobInvertedRect2::unregisterFromGroup() {
+	if (m_group) m_group->clearInvertedRect(this);
+}

Plugins/ZShell/Blobs/blobinvertedrect2.hpp

@@ -0,0 +1,58 @@
+#pragma once
+
+#include "blobshape2.hpp"
+
+#include <qqmlengine.h>
+
+class BlobInvertedRect2 : public BlobShape2 {
+	Q_OBJECT
+	QML_ELEMENT
+	Q_PROPERTY(
+		qreal borderLeft READ borderLeft WRITE setBorderLeft NOTIFY
+			borderLeftChanged)
+	Q_PROPERTY(
+		qreal borderRight READ borderRight WRITE setBorderRight NOTIFY
+			borderRightChanged)
+	Q_PROPERTY(
+		qreal borderTop READ borderTop WRITE setBorderTop NOTIFY
+			borderTopChanged)
+	Q_PROPERTY(
+		qreal borderBottom READ borderBottom WRITE setBorderBottom NOTIFY
+			borderBottomChanged)
+
+	public:
+	explicit BlobInvertedRect2(QQuickItem* parent = nullptr);
+	~BlobInvertedRect2() override;
+
+	[[nodiscard]] qreal borderLeft() const { return m_borderLeft; }
+
+	void setBorderLeft(qreal v);
+
+	[[nodiscard]] qreal borderRight() const { return m_borderRight; }
+
+	void setBorderRight(qreal v);
+
+	[[nodiscard]] qreal borderTop() const { return m_borderTop; }
+
+	void setBorderTop(qreal v);
+
+	[[nodiscard]] qreal borderBottom() const { return m_borderBottom; }
+
+	void setBorderBottom(qreal v);
+
+	signals:
+	void borderLeftChanged();
+	void borderRightChanged();
+	void borderTopChanged();
+	void borderBottomChanged();
+
+	protected:
+	void registerWithGroup() override;
+	void unregisterFromGroup() override;
+
+	private:
+	qreal m_borderLeft = 0;
+	qreal m_borderRight = 0;
+	qreal m_borderTop = 0;
+	qreal m_borderBottom = 0;
+};

Plugins/ZShell/Blobs/blobmaterial.cpp

@@ -33,7 +33,7 @@ bool BlobMaterialShader::updateUniformData(
 	Q_UNUSED(oldMaterial);
 	auto* mat = static_cast<BlobMaterial*>(newMaterial);
 	QByteArray* buf = state.uniformData();
-	Q_ASSERT(buf->size() >= 1440);
+	Q_ASSERT(buf->size() >= 1472);
 
 	if (state.isMatrixDirty()) {
 		const QMatrix4x4 m = state.combinedMatrix();
@@ -56,7 +56,7 @@ bool BlobMaterialShader::updateUniformData(
 	// Rect count (offset 88)
 	memcpy(buf->data() + 88, &mat->m_rectCount, 4);
 
-	// My index (offset 92)
+	// My index (offset 92). -2 skips the ownership test in the shader.
 	memcpy(buf->data() + 92, &mat->m_myIndex, 4);
 
 	// Color as vec4 (offset 96, 16 bytes)
@@ -100,5 +100,10 @@ bool BlobMaterialShader::updateUniformData(
 		memcpy(buf->data() + base + 64, r.radius, 16);
 	}
 
+	// Shadow: after rectData, which ends at 1440. shadowColor is 16-byte aligned,
+	// so it lands at 1456.
+	memcpy(buf->data() + 1440, &mat->m_shadowRadius, 4);
+	memcpy(buf->data() + 1456, mat->m_shadowColor, 16);
+
 	return true;
 }

Plugins/ZShell/Blobs/blobmaterial.hpp

@@ -32,12 +32,17 @@ class BlobMaterial : public QSGMaterial {
 	float m_paddedH = 0;
 	float m_smoothFactor = 32.0f;
 	int m_rectCount = 0;
+	// -2 means no owner test: the single group draw writes every pixel it covers.
 	int m_myIndex = -2;
 	QColor m_color{0x44, 0x88, 0xff};
 	int m_hasInverted = 0;
 	float m_invertedRadius = 0;
 	float m_invertedOuter[4] = {};
 	float m_invertedInner[4] = {};
+	// Phase 2: shadow around the material edges. Matches the uniform block, which
+	// puts these after rectData.
+	float m_shadowRadius = 0.0f;
+	float m_shadowColor[4] = {0.0f, 0.0f, 0.0f, 0.5f};
 	BlobRectData m_rects[16] = {};
 };
 

Plugins/ZShell/Blobs/blobrect.cpp

@@ -5,6 +5,10 @@
 #include <cmath>
 #include <qnamespace.h>
 
+namespace {
+constexpr float k_retireMs = 120.0f;
+}
+
 BlobRect::BlobRect(QQuickItem* parent) : BlobShape(parent) {}
 
 BlobRect::~BlobRect() {
@@ -12,41 +16,75 @@ BlobRect::~BlobRect() {
 }
 
 void BlobRect::updatePolish() {
-	if (m_physicsActive) {
-		float totalDelta = std::abs(m_dm00 - 1.0f) + std::abs(m_dm01) +
-						   std::abs(m_dm11 - 1.0f);
-		float totalVel =
-			std::abs(m_dmVel00) + std::abs(m_dmVel01) + std::abs(m_dmVel11);
+	BlobShape::updatePolish();
 
-		if (totalDelta < 0.004f && totalVel < 0.05f) {
+	if (!m_physicsActive) return;
+
+	if (m_retiring) {
+		const float t = std::clamp(
+			static_cast<float>(m_retireElapsed.elapsed()) / k_retireMs,
+			0.0f,
+			1.0f);
+		const float s = t * t * (3.0f - 2.0f * t);
+
+		if (t >= 1.0f) {
 			m_dm00 = 1.0f;
 			m_dm01 = 0.0f;
 			m_dm11 = 1.0f;
-			m_dmVel00 = m_dmVel01 = m_dmVel11 = 0.0f;
 			m_deformMatrix = QMatrix4x4();
-			emit rawDeformMatrixChanged();
-			updateCenteredDeformMatrix();
+			m_retiring = false;
 			m_physicsActive = false;
-
-			if (m_group) {
-				QMetaObject::invokeMethod(
-					this,
-					[this]() {
-						if (m_group) m_group->markDirty();
-					},
-					Qt::QueuedConnection);
-			}
 		} else {
-			QMetaObject::invokeMethod(
-				this,
-				[this]() {
-					if (m_physicsActive && m_group) m_group->markDirty();
-				},
-				Qt::QueuedConnection);
+			m_dm00 = m_retire00 + (1.0f - m_retire00) * s;
+			m_dm01 = m_retire01 - m_retire01 * s;
+			m_dm11 = m_retire11 + (1.0f - m_retire11) * s;
+			m_deformMatrix = QMatrix4x4(
+				m_dm00,
+				m_dm01,
+				0,
+				0,
+				m_dm01,
+				m_dm11,
+				0,
+				0,
+				0,
+				0,
+				1,
+				0,
+				0,
+				0,
+				0,
+				1);
 		}
+
+		emit rawDeformMatrixChanged();
+		updateCenteredDeformMatrix();
+
+		if (!m_physicsActive) return;
+	} else {
+		const float totalDelta = std::abs(m_dm00 - 1.0f) + std::abs(m_dm01) +
+								 std::abs(m_dm11 - 1.0f);
+		const float totalVel =
+			std::abs(m_dmVel00) + std::abs(m_dmVel01) + std::abs(m_dmVel11);
+
+		if (totalDelta < 0.004f && totalVel < 0.05f) beginRetire();
 	}
 
-	BlobShape::updatePolish();
+	QMetaObject::invokeMethod(
+		this,
+		[this]() {
+			if (m_physicsActive && m_group) m_group->markDirty();
+		},
+		Qt::QueuedConnection);
+}
+
+void BlobRect::beginRetire() {
+	m_retire00 = m_dm00;
+	m_retire01 = m_dm01;
+	m_retire11 = m_dm11;
+	m_dmVel00 = m_dmVel01 = m_dmVel11 = 0.0f;
+	m_retireElapsed.start();
+	m_retiring = true;
 }
 
 void BlobRect::updatePhysics() {
@@ -74,6 +112,13 @@ void BlobRect::updatePhysics() {
 
 	const float speed = std::sqrt(velX * velX + velY * velY);
 
+	if (m_retiring) {
+		if (speed > 5.0f)
+			m_retiring = false;
+		else
+			return;
+	}
+
 	if (!m_physicsActive) {
 		if (speed < 5.0f) return;
 		m_physicsActive = true;
@@ -297,6 +342,8 @@ void BlobRect::excludeCornersRemoveLast(QQmlListProperty<BlobRect>* prop) {
 }
 
 void BlobRect::checkAtRest(float speed) {
+	if (m_retiring) return;
+
 	constexpr float kEpsilon = 0.002f;
 	const bool atRest =
 		std::abs(m_dm00 - 1.0f) < kEpsilon && std::abs(m_dm01) < kEpsilon &&
@@ -304,25 +351,5 @@ void BlobRect::checkAtRest(float speed) {
 		std::abs(m_dmVel01) < kEpsilon && std::abs(m_dmVel11) < kEpsilon &&
 		speed < 5.0f;
 
-	if (atRest) {
-		m_dm00 = 1.0f;
-		m_dm01 = 0.0f;
-		m_dm11 = 1.0f;
-		m_dmVel00 = 0.0f;
-		m_dmVel01 = 0.0f;
-		m_dmVel11 = 0.0f;
-		m_deformMatrix = QMatrix4x4();
-		emit rawDeformMatrixChanged();
-		updateCenteredDeformMatrix();
-		m_physicsActive = false;
-
-		if (m_group) {
-			QMetaObject::invokeMethod(
-				this,
-				[this]() {
-					if (m_group) m_group->markDirty();
-				},
-				Qt::QueuedConnection);
-		}
-	}
+	if (atRest) beginRetire();
 }

Plugins/ZShell/Blobs/blobrect.hpp

@@ -108,6 +108,7 @@ class BlobRect : public BlobShape {
 
 	private:
 	void checkAtRest(float speed);
+	void beginRetire();
 
 	// Physics state
 	QPointF m_prevScenePos;
@@ -115,6 +116,12 @@ class BlobRect : public BlobShape {
 	bool m_physicsActive = false;
 	bool m_hasPrevPos = false;
 
+	bool m_retiring = false;
+	QElapsedTimer m_retireElapsed;
+	float m_retire00 = 1.0f;
+	float m_retire01 = 0.0f;
+	float m_retire11 = 1.0f;
+
 	// Symmetric 2x2 deformation matrix components (3 independent: m00, m01,
 	// m11) Rest state is identity: m00=1, m01=0, m11=1
 	float m_dm00 = 1.0f;

Plugins/ZShell/Blobs/blobrect2.cpp

@@ -0,0 +1,353 @@
+#include "blobrect2.hpp"
+#include "blobgroup2.hpp"
+
+#include <algorithm>
+#include <cmath>
+
+namespace {
+constexpr float k_retireMs = 120.0f;
+} // namespace
+
+BlobRect2::BlobRect2(QQuickItem* parent) : BlobShape2(parent) {}
+
+BlobRect2::~BlobRect2() {
+	if (m_group) m_group->removeShape(this);
+}
+
+void BlobRect2::finishAtIdentity() {
+	m_dm00 = 1.0f;
+	m_dm01 = 0.0f;
+	m_dm11 = 1.0f;
+	m_deformMatrix = QMatrix4x4();
+	m_retiring = false;
+	m_physicsActive = false;
+	emit rawDeformMatrixChanged();
+	updateCenteredDeformMatrix();
+}
+
+void BlobRect2::beginRetire() {
+	// The settle check would otherwise re-enter this every frame and restart the
+	// curve timer, so the curve never reaches t = 1.
+	if (m_retiring) return;
+
+	m_retire00 = m_dm00;
+	m_retire01 = m_dm01;
+	m_retire11 = m_dm11;
+	m_dmVel00 = m_dmVel01 = m_dmVel11 = 0.0f;
+	m_retireElapsed.start();
+	m_retiring = true;
+}
+
+void BlobRect2::updatePhysics() {
+	// Shapes are data only, so the group drives physics here.
+	if (m_retiring) {
+		const float t = std::clamp(
+			static_cast<float>(m_retireElapsed.elapsed()) / k_retireMs,
+			0.0f,
+			1.0f);
+		const float s = t * t * (3.0f - 2.0f * t);
+
+		if (t >= 1.0f) {
+			finishAtIdentity();
+			return;
+		}
+
+		m_dm00 = m_retire00 + (1.0f - m_retire00) * s;
+		m_dm01 = m_retire01 - m_retire01 * s;
+		m_dm11 = m_retire11 + (1.0f - m_retire11) * s;
+		m_deformMatrix = QMatrix4x4(
+			m_dm00, m_dm01, 0, 0, m_dm01, m_dm11, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
+		emit rawDeformMatrixChanged();
+		updateCenteredDeformMatrix();
+
+		if (!m_physicsActive) return;
+	}
+
+	// No "not active" guard here: an inactive shape still has to be evaluated so it
+	// can see the panel start moving and become active. The frame loop is only kept
+	// alive while active, and it is requested before anything can return early —
+	// requesting it at the end lets a shape stop being evaluated with the matrix
+	// still off identity, which is what left the panel contents blurry.
+	if (m_physicsActive && m_group) m_group->markDirty();
+
+	const QPointF scenePos = mapToScene(QPointF(width() / 2.0, height() / 2.0));
+
+	if (!m_hasPrevPos) {
+		m_prevScenePos = scenePos;
+		m_elapsed.start();
+		m_hasPrevPos = true;
+		return;
+	}
+
+	const float dt = static_cast<float>(m_elapsed.restart()) / 1000.0f;
+	if (dt > 0.1f || dt < 0.001f) {
+		m_prevScenePos = scenePos;
+		if (m_physicsActive) checkAtRest(0.0f);
+		return;
+	}
+
+	const float velX =
+		static_cast<float>(scenePos.x() - m_prevScenePos.x()) / dt;
+	const float velY =
+		static_cast<float>(scenePos.y() - m_prevScenePos.y()) / dt;
+	m_prevScenePos = scenePos;
+
+	const float speed = std::sqrt(velX * velX + velY * velY);
+
+	if (m_retiring) {
+		if (speed > 5.0f)
+			m_retiring = false;
+		else
+			return;
+	}
+
+	if (!m_physicsActive) {
+		if (speed < 5.0f) return;
+		m_physicsActive = true;
+	}
+
+	const float kStretchFactor = static_cast<float>(m_deformScale);
+	constexpr float kMaxStretch = 0.35f;
+
+	float target00 = 1.0f;
+	float target01 = 0.0f;
+	float target11 = 1.0f;
+
+	if (speed > 5.0f) {
+		const float targetStretch =
+			1.0f + std::min(speed * kStretchFactor, kMaxStretch);
+		const float targetCompress = 1.0f / targetStretch;
+
+		const float cosA = velX / speed;
+		const float sinA = velY / speed;
+		const float cos2 = cosA * cosA;
+		const float sin2 = sinA * sinA;
+		const float cs = cosA * sinA;
+
+		target00 = targetStretch * cos2 + targetCompress * sin2;
+		target01 = (targetStretch - targetCompress) * cs;
+		target11 = targetStretch * sin2 + targetCompress * cos2;
+	}
+
+	const float kStiffness = static_cast<float>(m_stiffness);
+	const float kDamping = static_cast<float>(m_damping);
+	const float invDamp = 1.0f / (1.0f + kDamping * dt);
+
+	m_dmVel00 = (m_dmVel00 - kStiffness * (m_dm00 - target00) * dt) * invDamp;
+	m_dm00 += m_dmVel00 * dt;
+
+	m_dmVel01 = (m_dmVel01 - kStiffness * (m_dm01 - target01) * dt) * invDamp;
+	m_dm01 += m_dmVel01 * dt;
+
+	m_dmVel11 = (m_dmVel11 - kStiffness * (m_dm11 - target11) * dt) * invDamp;
+	m_dm11 += m_dmVel11 * dt;
+
+	m_deformMatrix = QMatrix4x4(
+		m_dm00, m_dm01, 0, 0, m_dm01, m_dm11, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
+	emit rawDeformMatrixChanged();
+	updateCenteredDeformMatrix();
+
+	// Start the retire as soon as the matrix is close to identity, as in v1. Waiting
+	// for every term to fall below kEpsilon keeps the matrix just off identity for
+	// longer, and the panel content is transformed by it, which reads as blur on
+	// text.
+	const float totalDelta =
+		std::abs(m_dm00 - 1.0f) + std::abs(m_dm01) + std::abs(m_dm11 - 1.0f);
+	const float totalVel =
+		std::abs(m_dmVel00) + std::abs(m_dmVel01) + std::abs(m_dmVel11);
+	// The residual is already inside the rest epsilon, so the eased curve would only
+	// be aborted or restarted every frame by the panel creeping. Snap instead.
+	if (totalDelta < 0.004f && totalVel < 0.05f) {
+		finishAtIdentity();
+		return;
+	}
+
+	checkAtRest(speed);
+}
+
+void BlobRect2::setTopLeftRadius(qreal r) {
+	if (!qFuzzyCompare(m_topLeftRadius, r)) {
+		m_topLeftRadius = r;
+		emit topLeftRadiusChanged();
+		if (m_group) m_group->markDirty();
+	}
+}
+
+void BlobRect2::setTopRightRadius(qreal r) {
+	if (!qFuzzyCompare(m_topRightRadius, r)) {
+		m_topRightRadius = r;
+		emit topRightRadiusChanged();
+		if (m_group) m_group->markDirty();
+	}
+}
+
+void BlobRect2::setBottomLeftRadius(qreal r) {
+	if (!qFuzzyCompare(m_bottomLeftRadius, r)) {
+		m_bottomLeftRadius = r;
+		emit bottomLeftRadiusChanged();
+		if (m_group) m_group->markDirty();
+	}
+}
+
+void BlobRect2::setBottomRightRadius(qreal r) {
+	if (!qFuzzyCompare(m_bottomRightRadius, r)) {
+		m_bottomRightRadius = r;
+		emit bottomRightRadiusChanged();
+		if (m_group) m_group->markDirty();
+	}
+}
+
+void BlobRect2::cornerRadii(float out[4]) const {
+	const auto maxR = static_cast<float>(std::min(width(), height())) * 0.5f;
+	const auto base = std::min(static_cast<float>(m_radius), maxR);
+	out[0] = std::min(
+		m_topRightRadius >= 0 ? static_cast<float>(m_topRightRadius) : base,
+		maxR);
+	out[1] = std::min(
+		m_bottomRightRadius >= 0 ? static_cast<float>(m_bottomRightRadius)
+								 : base,
+		maxR);
+	out[2] = std::min(
+		m_bottomLeftRadius >= 0 ? static_cast<float>(m_bottomLeftRadius) : base,
+		maxR);
+	out[3] = std::min(
+		m_topLeftRadius >= 0 ? static_cast<float>(m_topLeftRadius) : base,
+		maxR);
+}
+
+bool BlobRect2::isExcluded(const BlobShape2* other) const {
+	for (const auto& ptr : m_exclude) {
+		if (ptr == other) return true;
+	}
+	return false;
+}
+
+bool BlobRect2::isCornerExcluded(const BlobShape2* other) const {
+	for (const auto& ptr : m_excludeCorners) {
+		if (ptr == other) return true;
+	}
+	return false;
+}
+
+QQmlListProperty<BlobRect2> BlobRect2::exclude() {
+	return QQmlListProperty<BlobRect2>(
+		this,
+		nullptr,
+		&excludeAppend,
+		&excludeCount,
+		&excludeAt,
+		&excludeClear,
+		&excludeReplace,
+		&excludeRemoveLast);
+}
+
+QQmlListProperty<BlobRect2> BlobRect2::excludeCorners() {
+	return QQmlListProperty<BlobRect2>(
+		this,
+		nullptr,
+		&excludeCornersAppend,
+		&excludeCornersCount,
+		&excludeCornersAt,
+		&excludeCornersClear,
+		&excludeCornersReplace,
+		&excludeCornersRemoveLast);
+}
+
+void BlobRect2::excludeAppend(
+	QQmlListProperty<BlobRect2>* prop, BlobRect2* rect) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	self->m_exclude.append(rect);
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeChanged();
+}
+
+qsizetype BlobRect2::excludeCount(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	return self->m_exclude.size();
+}
+
+BlobRect2* BlobRect2::excludeAt(
+	QQmlListProperty<BlobRect2>* prop, qsizetype index) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	return self->m_exclude.at(index);
+}
+
+void BlobRect2::excludeClear(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	if (self->m_exclude.isEmpty()) return;
+	self->m_exclude.clear();
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeChanged();
+}
+
+void BlobRect2::excludeReplace(
+	QQmlListProperty<BlobRect2>* prop, qsizetype index, BlobRect2* rect) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	self->m_exclude[index] = rect;
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeChanged();
+}
+
+void BlobRect2::excludeRemoveLast(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	if (self->m_exclude.isEmpty()) return;
+	self->m_exclude.removeLast();
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeChanged();
+}
+
+void BlobRect2::excludeCornersAppend(
+	QQmlListProperty<BlobRect2>* prop, BlobRect2* rect) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	self->m_excludeCorners.append(rect);
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeCornersChanged();
+}
+
+qsizetype BlobRect2::excludeCornersCount(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	return self->m_excludeCorners.size();
+}
+
+BlobRect2* BlobRect2::excludeCornersAt(
+	QQmlListProperty<BlobRect2>* prop, qsizetype index) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	return self->m_excludeCorners.at(index);
+}
+
+void BlobRect2::excludeCornersClear(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	if (self->m_excludeCorners.isEmpty()) return;
+	self->m_excludeCorners.clear();
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeCornersChanged();
+}
+
+void BlobRect2::excludeCornersReplace(
+	QQmlListProperty<BlobRect2>* prop, qsizetype index, BlobRect2* rect) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	self->m_excludeCorners[index] = rect;
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeCornersChanged();
+}
+
+void BlobRect2::excludeCornersRemoveLast(QQmlListProperty<BlobRect2>* prop) {
+	auto* self = static_cast<BlobRect2*>(prop->object);
+	if (self->m_excludeCorners.isEmpty()) return;
+	self->m_excludeCorners.removeLast();
+	if (self->m_group) self->m_group->markDirty();
+	emit self->excludeCornersChanged();
+}
+
+void BlobRect2::checkAtRest(float speed) {
+	if (m_retiring) return;
+
+	constexpr float kEpsilon = 0.002f;
+	const bool atRest =
+		std::abs(m_dm00 - 1.0f) < kEpsilon && std::abs(m_dm01) < kEpsilon &&
+		std::abs(m_dm11 - 1.0f) < kEpsilon && std::abs(m_dmVel00) < kEpsilon &&
+		std::abs(m_dmVel01) < kEpsilon && std::abs(m_dmVel11) < kEpsilon &&
+		speed < 5.0f;
+
+	if (atRest) beginRetire();
+}

Plugins/ZShell/Blobs/blobrect2.hpp

@@ -0,0 +1,167 @@
+#pragma once
+
+#include "blobshape2.hpp"
+
+#include <qelapsedtimer.h>
+#include <qpointer.h>
+#include <qqmlengine.h>
+#include <qqmllist.h>
+
+class BlobRect2 : public BlobShape2 {
+	Q_OBJECT
+	QML_ELEMENT
+	Q_PROPERTY(
+		qreal stiffness READ stiffness WRITE setStiffness NOTIFY
+			stiffnessChanged)
+	Q_PROPERTY(qreal damping READ damping WRITE setDamping NOTIFY dampingChanged)
+	Q_PROPERTY(
+		qreal deformScale READ deformScale WRITE setDeformScale NOTIFY
+			deformScaleChanged)
+	Q_PROPERTY(
+		QQmlListProperty<BlobRect2> exclude READ exclude NOTIFY excludeChanged)
+	Q_PROPERTY(
+		QQmlListProperty<BlobRect2> excludeCorners READ excludeCorners NOTIFY
+			excludeCornersChanged)
+	Q_PROPERTY(
+		qreal topLeftRadius READ topLeftRadius WRITE setTopLeftRadius NOTIFY
+			topLeftRadiusChanged)
+	Q_PROPERTY(
+		qreal topRightRadius READ topRightRadius WRITE setTopRightRadius NOTIFY
+			topRightRadiusChanged)
+	Q_PROPERTY(
+		qreal bottomLeftRadius READ bottomLeftRadius WRITE setBottomLeftRadius
+			NOTIFY bottomLeftRadiusChanged)
+	Q_PROPERTY(
+		qreal bottomRightRadius READ bottomRightRadius WRITE
+			setBottomRightRadius NOTIFY bottomRightRadiusChanged)
+
+	public:
+	explicit BlobRect2(QQuickItem* parent = nullptr);
+	~BlobRect2() override;
+
+	[[nodiscard]] qreal stiffness() const { return m_stiffness; }
+
+	void setStiffness(qreal s) {
+		if (!qFuzzyCompare(m_stiffness, s)) {
+			m_stiffness = s;
+			emit stiffnessChanged();
+		}
+	}
+
+	[[nodiscard]] qreal damping() const { return m_damping; }
+
+	void setDamping(qreal value) {
+		if (!qFuzzyCompare(m_damping, value)) {
+			m_damping = value;
+			emit dampingChanged();
+		}
+	}
+
+	[[nodiscard]] qreal deformScale() const { return m_deformScale; }
+
+	void setDeformScale(qreal s) {
+		if (!qFuzzyCompare(m_deformScale, s)) {
+			m_deformScale = s;
+			emit deformScaleChanged();
+		}
+	}
+
+	QQmlListProperty<BlobRect2> exclude();
+	QQmlListProperty<BlobRect2> excludeCorners();
+
+	bool isExcluded(const BlobShape2* other) const override;
+	bool isCornerExcluded(const BlobShape2* other) const override;
+	void cornerRadii(float out[4]) const override;
+
+	[[nodiscard]] qreal topLeftRadius() const { return m_topLeftRadius; }
+
+	void setTopLeftRadius(qreal r);
+
+	[[nodiscard]] qreal topRightRadius() const { return m_topRightRadius; }
+
+	void setTopRightRadius(qreal r);
+
+	[[nodiscard]] qreal bottomLeftRadius() const { return m_bottomLeftRadius; }
+
+	void setBottomLeftRadius(qreal r);
+
+	[[nodiscard]] qreal bottomRightRadius() const {
+		return m_bottomRightRadius;
+	}
+
+	void setBottomRightRadius(qreal r);
+
+	signals:
+	void stiffnessChanged();
+	void dampingChanged();
+	void deformScaleChanged();
+	void excludeChanged();
+	void excludeCornersChanged();
+	void topLeftRadiusChanged();
+	void topRightRadiusChanged();
+	void bottomLeftRadiusChanged();
+	void bottomRightRadiusChanged();
+
+	protected:
+	void updatePhysics() override;
+
+	private:
+	void checkAtRest(float speed);
+	void beginRetire();
+	void finishAtIdentity();
+
+	// Physics state
+	QPointF m_prevScenePos;
+	QElapsedTimer m_elapsed;
+	bool m_physicsActive = false;
+	bool m_hasPrevPos = false;
+
+	bool m_retiring = false;
+	QElapsedTimer m_retireElapsed;
+	float m_retire00 = 1.0f;
+	float m_retire01 = 0.0f;
+	float m_retire11 = 1.0f;
+
+	// Symmetric 2x2 deformation matrix components (3 independent: m00, m01,
+	// m11) Rest state is identity: m00=1, m01=0, m11=1
+	float m_dm00 = 1.0f;
+	float m_dm01 = 0.0f;
+	float m_dm11 = 1.0f;
+
+	// Spring velocities for each component
+	float m_dmVel00 = 0.0f;
+	float m_dmVel01 = 0.0f;
+	float m_dmVel11 = 0.0f;
+
+	qreal m_stiffness = 200.0;
+	qreal m_damping = 16.0;
+	qreal m_deformScale = 0.0005;
+
+	qreal m_topLeftRadius = -1;
+	qreal m_topRightRadius = -1;
+	qreal m_bottomLeftRadius = -1;
+	qreal m_bottomRightRadius = -1;
+
+	QList<QPointer<BlobRect2>> m_exclude;
+	QList<QPointer<BlobRect2>> m_excludeCorners;
+
+	static void excludeAppend(
+		QQmlListProperty<BlobRect2>* prop, BlobRect2* rect);
+	static qsizetype excludeCount(QQmlListProperty<BlobRect2>* prop);
+	static BlobRect2* excludeAt(
+		QQmlListProperty<BlobRect2>* prop, qsizetype index);
+	static void excludeClear(QQmlListProperty<BlobRect2>* prop);
+	static void excludeReplace(
+		QQmlListProperty<BlobRect2>* prop, qsizetype index, BlobRect2* rect);
+	static void excludeRemoveLast(QQmlListProperty<BlobRect2>* prop);
+
+	static void excludeCornersAppend(
+		QQmlListProperty<BlobRect2>* prop, BlobRect2* rect);
+	static qsizetype excludeCornersCount(QQmlListProperty<BlobRect2>* prop);
+	static BlobRect2* excludeCornersAt(
+		QQmlListProperty<BlobRect2>* prop, qsizetype index);
+	static void excludeCornersClear(QQmlListProperty<BlobRect2>* prop);
+	static void excludeCornersReplace(
+		QQmlListProperty<BlobRect2>* prop, qsizetype index, BlobRect2* rect);
+	static void excludeCornersRemoveLast(QQmlListProperty<BlobRect2>* prop);
+};

Plugins/ZShell/Blobs/blobshape.cpp

@@ -168,8 +168,10 @@ void BlobShape::updatePolish() {
 
 		if (other->width() <= 0 || other->height() <= 0) continue;
 
-		if (isExcluded(other)) continue;
-
+		// Excluded shapes stay in the rect data. Exclusion only gates the smooth
+		// blend (via excludeMask below); ownership must still see every shape,
+		// otherwise two nodes can both believe they own a pixel and the pixel is
+		// blended twice.
 		const QPointF otherScene = other->mapToScene(QPointF(0, 0));
 
 		bool include = false;

Plugins/ZShell/Blobs/blobshape2.cpp

@@ -0,0 +1,67 @@
+#include "blobshape2.hpp"
+#include "blobgroup2.hpp"
+
+#include <algorithm>
+#include <cmath>
+
+BlobShape2::BlobShape2(QQuickItem* parent) : QQuickItem(parent) {}
+
+void BlobShape2::setGroup(BlobGroup2* g) {
+	if (m_group == g) return;
+	if (m_group && isComponentComplete()) unregisterFromGroup();
+	m_group = g;
+	if (m_group && isComponentComplete()) registerWithGroup();
+	emit groupChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobShape2::setRadius(qreal r) {
+	if (qFuzzyCompare(m_radius, r)) return;
+	m_radius = r;
+	emit radiusChanged();
+	if (m_group) m_group->markDirty();
+}
+
+void BlobShape2::componentComplete() {
+	QQuickItem::componentComplete();
+	if (m_group) registerWithGroup();
+}
+
+void BlobShape2::geometryChange(
+	const QRectF& newGeometry, const QRectF& oldGeometry) {
+	QQuickItem::geometryChange(newGeometry, oldGeometry);
+	updateCenteredDeformMatrix();
+
+	// One draw covers the whole group, so any shape change is a group change.
+	if (m_group) m_group->markDirty();
+}
+
+void BlobShape2::updateCenteredDeformMatrix() {
+	const auto cx = static_cast<float>(width()) * 0.5f;
+	const auto cy = static_cast<float>(height()) * 0.5f;
+	QMatrix4x4 result;
+	result.translate(cx, cy);
+	result *= m_deformMatrix;
+	result.translate(-cx, -cy);
+	if (m_centeredDeformMatrix != result) {
+		m_centeredDeformMatrix = result;
+		emit deformMatrixChanged();
+	}
+}
+
+void BlobShape2::cornerRadii(float out[4]) const {
+	const auto maxR = static_cast<float>(std::min(width(), height())) * 0.5f;
+	const auto r = std::min(static_cast<float>(m_radius), maxR);
+	out[0] = r;
+	out[1] = r;
+	out[2] = r;
+	out[3] = r;
+}
+
+void BlobShape2::registerWithGroup() {
+	if (m_group) m_group->addShape(this);
+}
+
+void BlobShape2::unregisterFromGroup() {
+	if (m_group) m_group->removeShape(this);
+}

Plugins/ZShell/Blobs/blobshape2.hpp

@@ -0,0 +1,76 @@
+#pragma once
+
+#include "blobgroup2.hpp"
+
+#include <qmatrix4x4.h>
+#include <qquickitem.h>
+
+class BlobGroup2;
+
+// Data-only shape.
+//
+// The group draws a single node for the whole group, so a shape here contributes
+// only what the shader needs: position, radii, exclusion, physics. A shape does
+// not create a render node, so no pixel can be evaluated by one shape and missed
+// by another.
+class BlobShape2 : public QQuickItem {
+	Q_OBJECT
+	Q_PROPERTY(BlobGroup2* group READ group WRITE setGroup NOTIFY groupChanged)
+	Q_PROPERTY(qreal radius READ radius WRITE setRadius NOTIFY radiusChanged)
+	Q_PROPERTY(
+		QMatrix4x4 deformMatrix READ deformMatrix NOTIFY deformMatrixChanged)
+	Q_PROPERTY(
+		QMatrix4x4 rawDeformMatrix READ rawDeformMatrix NOTIFY
+			rawDeformMatrixChanged)
+
+	friend class BlobGroup2;
+
+	public:
+	explicit BlobShape2(QQuickItem* parent = nullptr);
+	~BlobShape2() override = default;
+
+	[[nodiscard]] BlobGroup2* group() const { return m_group; }
+
+	void setGroup(BlobGroup2* g);
+
+	[[nodiscard]] qreal radius() const { return m_radius; }
+
+	void setRadius(qreal r);
+
+	[[nodiscard]] QMatrix4x4 deformMatrix() const {
+		return m_centeredDeformMatrix;
+	}
+
+	[[nodiscard]] QMatrix4x4 rawDeformMatrix() const { return m_deformMatrix; }
+
+	signals:
+	void groupChanged();
+	void radiusChanged();
+	void deformMatrixChanged();
+	void rawDeformMatrixChanged();
+
+	protected:
+	void componentComplete() override;
+	void geometryChange(
+		const QRectF& newGeometry, const QRectF& oldGeometry) override;
+
+	virtual bool isExcluded(const BlobShape2*) const { return false; }
+
+	virtual bool isCornerExcluded(const BlobShape2* /*other*/) const {
+		return false;
+	}
+
+	virtual void cornerRadii(float out[4]) const;
+
+	// Called by the group when it rebuilds the shared data, once per frame.
+	virtual void updatePhysics() {}
+
+	virtual void registerWithGroup();
+	virtual void unregisterFromGroup();
+	void updateCenteredDeformMatrix();
+
+	BlobGroup2* m_group = nullptr;
+	qreal m_radius = 0;
+	QMatrix4x4 m_deformMatrix; // identity by default
+	QMatrix4x4 m_centeredDeformMatrix;
+};

Plugins/ZShell/Blobs/shaders/blob.frag

@@ -19,6 +19,8 @@ layout(std140, binding = 0) uniform buf {
   vec4 invertedOuter;
   vec4 invertedInner;
   vec4 rectData[80];
+  float shadowRadius;
+  vec4 shadowColor;
 };
 
 float sdRoundedBox(vec2 p, vec2 center, vec2 halfSize, float radius) {
@@ -63,9 +65,10 @@ float smaxSharpA(float a, float b, float k) {
 void main() {
   vec2 pixel = vec2(paddedX, paddedY) + qt_TexCoord0 * vec2(paddedW, paddedH);
 
-  // Phase 1: compute per-rect SDF, track owner. We can't smin yet because
-  // excluded pairs need to skip the smooth blend, which requires pairwise pass
-  // below.
+  // Phase 1: compute per-rect SDF, and track which rect owns the pixel for the
+  // per-shape path (BlobGroup). The single group draw (BlobGroup2) has no owner:
+  // myIndex stays -2, so the ownership test is skipped and this pass writes every
+  // pixel the quad covers. Excluded pairs still need the pairwise pass below.
   float dArr[16];
   int owner = -2;
   float minDist = 1e10;
@@ -82,8 +85,10 @@ void main() {
     // Offset center for asymmetric deformation
     vec2 center = rect.xy + props.yz;
 
-    // AABB early-out: skip rects far from this pixel
-    vec2 extent = sh.xy + vec2(smoothFactor * 1.5);
+    // AABB early-out: skip rects far from this pixel. The reach has to include the
+    // shadow, otherwise a rect that is only inside the shadow range would be
+    // skipped and its distance could not be used.
+    vec2 extent = sh.xy + vec2(smoothFactor * 1.5 + shadowRadius);
     if (abs(pixel.x - center.x) > extent.x ||
         abs(pixel.y - center.y) > extent.y) {
       dArr[i] = 1e10;
@@ -251,14 +256,39 @@ void main() {
     }
   }
 
-  // Each renderer only outputs pixels it owns, but allow rendering
-  // blend zones to prevent gaps (mergedSdf < smoothFactor means in blend)
-  // myIndex == -1: inverted rect renders border-owned pixels
-  // myIndex >= 0: individual rect renders its owned pixels
-  if (owner != myIndex && mergedSdf > smoothFactor)
+  // A pixel this far from every rect cannot have a value, so it is not written.
+  // The one-unit margin keeps the outermost pixels of the quad out of the AA: their
+  // derivatives are undefined (the quad neighbour is outside the primitive), which
+  // is what drew a line along the coverage edge.
+  float reach = max(smoothFactor, shadowRadius);
+  if (mergedSdf > reach - 1.0)
     discard;
 
-  float fw = fwidth(mergedSdf);
-  float alpha = 1.0 - smoothstep(-fw, fw, mergedSdf);
-  fragColor = vec4(color.rgb * alpha, alpha) * qt_Opacity;
+  // Only the owner writes a pixel, which is what makes the per-shape path look
+  // like one surface: qt_Opacity is applied once per pixel instead of once per
+  // overlapping draw. The single group draw has no owner (myIndex == -2), so the
+  // test is skipped and the value below is the only value a pixel can have.
+  if (myIndex >= -1 && owner != myIndex)
+    discard;
+
+  // Fixed-width AA: fwidth is capped at one unit, so a bad derivative near the quad
+  // boundary cannot make a wide edge.
+  float fw = min(fwidth(mergedSdf), 1.0);
+  float materialAlpha = 1.0 - smoothstep(-fw, fw, mergedSdf);
+
+  // Phase 2: the shadow, as a distance falloff from the merged surface. The
+  // quadratic reaches zero with zero slope at its outer edge, so that edge needs no
+  // AA of its own. Only the single group draw writes a shadow: in the per-shape
+  // path overlapping draws would darken the same area twice.
+  float shadowAlpha = 0.0;
+  if (shadowRadius > 0.0 && myIndex == -2) {
+    float t = clamp(mergedSdf / shadowRadius, 0.0, 1.0);
+    shadowAlpha = (1.0 - t) * (1.0 - t) * shadowColor.a;
+  }
+
+  // Material over shadow, premultiplied.
+  float totalAlpha = materialAlpha + shadowAlpha * (1.0 - materialAlpha);
+  vec3 rgb = color.rgb * materialAlpha
+             + shadowColor.rgb * shadowAlpha * (1.0 - materialAlpha);
+  fragColor = vec4(rgb, totalAlpha) * qt_Opacity;
 }