Explicitly note which modifications in pixel history are unavailable

qrenderdoc/Windows/PixelHistoryView.cpp

@@ -476,6 +476,9 @@ private:
 
   QBrush backgroundBrush(const ModificationValue &val) const
   {
+    if(!val.IsValid())
+      return QBrush();
+
     float rangesize = (m_Display.rangeMax - m_Display.rangeMin);
 
     float r = val.col.floatValue[0];
@@ -521,6 +524,9 @@ private:
   {
     QString s;
 
+    if(!val.IsValid())
+      return tr("Unavailable");
+
     int numComps = (int)(m_Tex->format.compCount);
 
     if(forceComps > 0)

renderdoc/api/replay/data_types.h

@@ -1770,6 +1770,15 @@ struct ModificationValue
 
   DOCUMENT("The stencil output, or ``-1`` if not available.");
   int32_t stencil;
+
+  DOCUMENT("Returns whether or not this modification value is valid.");
+  bool IsValid() const { return col.uintValue[0] != 0xdeadbeef || col.uintValue[1] != 0xdeadf00d; }
+  DOCUMENT("Sets this modification value to be invalid.");
+  void SetInvalid()
+  {
+    col.uintValue[0] = 0xdeadbeef;
+    col.uintValue[1] = 0xdeadf00d;
+  }
 };
 
 DECLARE_REFLECTION_STRUCT(ModificationValue);

renderdoc/driver/vulkan/vk_pixelhistory.cpp

@@ -3266,6 +3266,9 @@ rdcarray<PixelModification> VulkanReplay::PixelHistory(rdcarray<EventUsage> even
     if(eventIndex == -1)
     {
       // There is no information, skip the event.
+      mod.preMod.SetInvalid();
+      mod.postMod.SetInvalid();
+      mod.shaderOut.SetInvalid();
       h++;
       continue;
     }

util/test/tests/Iter_Test.py

@@ -218,6 +218,11 @@ class Iter_Test(rdtest.TestCase):
                 lastmod = None
                 continue
 
+            if not mod.shaderOut.IsValid():
+                rdtest.log.print("This hit's shader out is not valid, looking for one that valid....")
+                lastmod = None
+                continue
+
             break
 
         if target == pipe.GetDepthTarget().resourceId: