Plugins/ZShell/Blobs/CMakeLists.txt

@@ -12,6 +12,7 @@ qml_module(ZShell-blobs
 
 qt_add_shaders(ZShell-blobs "blob_shaders"
     BATCHABLE OPTIMIZED NOHLSL NOMSL
+	GLSL "300es,330"
     PREFIX "/"
     FILES
         shaders/blob.frag

Plugins/ZShell/Blobs/blobmaterial.cpp

@@ -2,6 +2,9 @@
 
 #include <cstring>
 
+static_assert(sizeof(decltype(BlobRectData::excludeMask)) == sizeof(float),
+              "BlobMaterial packs excludeMask into a float slot via memcpy");
+
 QSGMaterialType* BlobMaterial::type() const {
 	static QSGMaterialType s_type;
 	return &s_type;
@@ -82,8 +85,11 @@ bool BlobMaterialShader::updateUniformData(RenderState& state, QSGMaterial* newM
 	for (int i = 0; i < count; ++i) {
 		const auto& r = mat->m_rects[i];
 		const int base = 160 + i * 80;
+		// Pack excludeMask into props.x via bit-cast (read in shader with floatBitsToInt)
+		float maskAsFloat;
+		memcpy(&maskAsFloat, &r.excludeMask, sizeof(float));
 		const float d0[4] = { r.cx, r.cy, r.hw, r.hh };
-		const float d1[4] = { 0.0f, r.offsetX, r.offsetY, r.minEig };
+		const float d1[4] = { maskAsFloat, r.offsetX, r.offsetY, r.minEig };
 		const float d3[4] = { r.screenHalfX, r.screenHalfY, 0.0f, 0.0f };
 		memcpy(buf->data() + base, d0, 16);
 		memcpy(buf->data() + base + 16, d1, 16);

Plugins/ZShell/Blobs/blobmaterial.hpp

@@ -14,6 +14,9 @@ struct BlobRectData {
 	float screenHalfX = 0, screenHalfY = 0;
 	// Effective per-corner radii (tr, br, bl, tl), pre-computed on CPU
 	float radius[4] = { 0, 0, 0, 0 };
+	// Bitmask of indices in this rect's m_cachedRects that mutually exclude (or are excluded by) this rect.
+	// Used by the shader to skip smin between excluded pairs.
+	int excludeMask = 0;
 };
 
 class BlobMaterial : public QSGMaterial {

Plugins/ZShell/Blobs/blobshape.cpp

@@ -149,6 +149,10 @@ void BlobShape::updatePolish() {
 	const QRectF myPadded(static_cast<double>(m_cachedPaddedX), static_cast<double>(m_cachedPaddedY),
 	                      static_cast<double>(m_cachedPaddedW), static_cast<double>(m_cachedPaddedH));
 
+	// Track shape pointers parallel to m_cachedRects for pairwise exclusion lookups
+	QVector<BlobShape*> rectShapes;
+	rectShapes.reserve(m_group->shapes().size());
+
 	for (BlobShape* other : m_group->shapes()) {
 		if (other->isInvertedRect())
 			continue;
@@ -210,12 +214,29 @@ void BlobShape::updatePolish() {
 			r.screenHalfY = std::abs(b) * r.hw + std::abs(d) * r.hh;
 
 			m_cachedRects.append(r);
+			rectShapes.append(other);
 		}
 	}
 
 	if (isInvertedRect())
 		m_cachedMyIndex = -1;
 
+	// Compute pairwise exclude masks. Bit j in entry i is set iff rect i excludes rect j
+	// or rect j excludes rect i. The shader uses this to avoid smin between excluded pairs.
+	const auto cachedCount = m_cachedRects.size();
+	for (qsizetype i = 0; i < cachedCount; ++i) {
+		int mask = 0;
+		BlobShape* si = rectShapes[i];
+		for (qsizetype j = 0; j < cachedCount; ++j) {
+			if (j == i)
+				continue;
+			BlobShape* sj = rectShapes[j];
+			if (si->isExcluded(sj) || sj->isExcluded(si))
+				mask |= (1 << j);
+		}
+		m_cachedRects[i].excludeMask = mask;
+	}
+
 	// Cache inverted rect data
 	m_cachedHasInverted = false;
 	m_cachedInvertedRadius = 0;
@@ -270,6 +291,7 @@ void BlobShape::updatePolish() {
 	const auto rectCount = m_cachedRects.size();
 	for (qsizetype i = 0; i < rectCount; ++i) {
 		auto& ri = m_cachedRects[i];
+		const int riExcludeMask = ri.excludeMask;
 		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;
@@ -280,6 +302,8 @@ void BlobShape::updatePolish() {
 		for (qsizetype j = 0; j < rectCount; ++j) {
 			if (j == i)
 				continue;
+			if (riExcludeMask & (1 << j))
+				continue;
 			const auto& rj = m_cachedRects[j];
 			fTr = std::min(fTr, cpuSmoothstep(0.0f, smoothFactor, cpuSdBox(cTrX, cTrY, rj.cx, rj.cy, rj.hw, rj.hh)));
 			fBr = std::min(fBr, cpuSmoothstep(0.0f, smoothFactor, cpuSdBox(cBrX, cBrY, rj.cx, rj.cy, rj.hw, rj.hh)));

Plugins/ZShell/Blobs/shaders/blob.frag

@@ -63,13 +63,17 @@ float smaxSharpA(float a, float b, float k) {
 void main() {
   vec2 pixel = vec2(paddedX, paddedY) + qt_TexCoord0 * vec2(paddedW, paddedH);
 
-  float mergedSdf = 1e10;
+  // 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.
+  float dArr[16];
   int owner = -2;
   float minDist = 1e10;
 
   for (int i = 0; i < rectCount; i++) {
     vec4 rect = rectData[i * 5]; // cx, cy, hw, hh
-    vec4 props = rectData[i * 5 + 1]; // radius, offsetX, offsetY, minEig
+    vec4 props =
+        rectData[i * 5 + 1]; // excludeMask(int bits), offsetX, offsetY, minEig
     vec4 invDm = rectData[i * 5 + 2]; // inverse deform matrix
     vec4 sh = rectData[i * 5 + 3];    // screenHalfX, screenHalfY, 0, 0
     vec4 radii =
@@ -81,8 +85,10 @@ void main() {
     // AABB early-out: skip rects far from this pixel
     vec2 extent = sh.xy + vec2(smoothFactor * 1.5);
     if (abs(pixel.x - center.x) > extent.x ||
-        abs(pixel.y - center.y) > extent.y)
+        abs(pixel.y - center.y) > extent.y) {
+      dArr[i] = 1e10;
       continue;
+    }
 
     // Apply pre-computed inverse deformation to the evaluation point
     mat2 invDeform = mat2(invDm.xy, invDm.zw);
@@ -138,13 +144,38 @@ void main() {
       d *= scale;
     }
 
-    mergedSdf = smin(mergedSdf, d, smoothFactor);
+    dArr[i] = d;
     if (d < smoothFactor && d < minDist) {
       minDist = d;
       owner = i;
     }
   }
 
+  // Phase 2: hard-min baseline over all rects.
+  float mergedSdf = 1e10;
+  for (int i = 0; i < rectCount; i++) {
+    mergedSdf = min(mergedSdf, dArr[i]);
+  }
+
+  // Phase 3: pair-wise smin contributions, skipping excluded pairs. Pair smin
+  // <= min, so taking the min over all non-excluded pair smins gives the
+  // smoothly-merged SDF.
+  for (int i = 0; i < rectCount; i++) {
+    if (dArr[i] >= 1e9)
+      continue;
+    int excludeMask = floatBitsToInt(rectData[i * 5 + 1].x);
+    for (int j = i + 1; j < rectCount; j++) {
+      if (dArr[j] >= 1e9)
+        continue;
+      if ((excludeMask & (1 << j)) != 0)
+        continue;
+      // smin only deviates from min within smoothFactor
+      if (abs(dArr[i] - dArr[j]) >= smoothFactor)
+        continue;
+      mergedSdf = min(mergedSdf, smin(dArr[i], dArr[j], smoothFactor));
+    }
+  }
+
   if (hasInverted != 0) {
     float dOuter = sdBox(pixel, invertedOuter.xy, invertedOuter.zw) - 1.0;
     float dInner =