Handle GL applications changing BASE_LEVEL / MAX_LEVEL dynamically

* This is the only way in GL to do rendering from one mip to another. We handle
  it and display the whole texture even if it's temporarily constricted, and
  display the mip state in the pipeline viewer.
* If the mip state is constricted at the start of the frame capture, only mips
  0..MAX will be visible at all and other mips will be assumed to not be valid.

qrenderdoc/Windows/PipelineState/GLPipelineStateViewer.cpp

@@ -470,6 +470,28 @@ void GLPipelineStateViewer::setEmptyRow(RDTreeWidgetItem *node)
   node->setForegroundColor(QColor(0, 0, 0));
 }
 
+void GLPipelineStateViewer::setViewDetails(RDTreeWidgetItem *node, TextureDescription *tex,
+                                           uint32_t firstMip, uint32_t numMips)
+{
+  if((tex->mips > 1 && firstMip > 0) || numMips < tex->mips)
+  {
+    QString text;
+
+    if(numMips == 1)
+      text += tr("The texture has %1 mips, the view covers mip %2.").arg(tex->mips).arg(firstMip);
+    else
+      text += tr("The texture has %1 mips, the view covers mips %2-%3.")
+                  .arg(tex->mips)
+                  .arg(firstMip)
+                  .arg(firstMip + numMips - 1);
+
+    node->setToolTip(text);
+
+    node->setBackgroundColor(QColor(127, 255, 212));
+    node->setForegroundColor(QColor(0, 0, 0));
+  }
+}
+
 bool GLPipelineStateViewer::showNode(bool usedSlot, bool filledSlot)
 {
   const bool showDisabled = ui->showDisabled->isChecked();
@@ -741,6 +763,9 @@ void GLPipelineStateViewer::setShaderState(const GLPipe::Shader &stage, RDLabel
 
         node->setTag(QVariant::fromValue(r.resourceId));
 
+        if(tex)
+          setViewDetails(node, tex, r.firstMip, r.numMips);
+
         if(!filledSlot)
           setEmptyRow(node);
 
@@ -1097,6 +1122,9 @@ void GLPipelineStateViewer::setShaderState(const GLPipe::Shader &stage, RDLabel
 
       node->setTag(tag);
 
+      if(im && tex)
+        setViewDetails(node, tex, im->mipLevel, 1);
+
       if(!filledSlot)
         setEmptyRow(node);
 
@@ -1826,7 +1854,11 @@ void GLPipelineStateViewer::setState()
             new RDTreeWidgetItem({i, p, typeName, w, h, d, a, format, QString()});
 
         if(tex)
+        {
+          if(r)
+            setViewDetails(node, tex, r->mipLevel, 1);
           node->setTag(QVariant::fromValue(p));
+        }
 
         if(p == ResourceId())
         {
@@ -1848,9 +1880,15 @@ void GLPipelineStateViewer::setState()
         state.framebuffer.drawFBO.stencilAttachment.resourceId,
     };
 
+    uint32_t dsMips[] = {
+        state.framebuffer.drawFBO.depthAttachment.mipLevel,
+        state.framebuffer.drawFBO.stencilAttachment.mipLevel,
+    };
+
     for(int dsIdx = 0; dsIdx < 2; dsIdx++)
     {
       ResourceId ds = dsObjects[dsIdx];
+      uint32_t mip = dsMips[dsIdx];
 
       bool filledSlot = (ds != ResourceId());
       bool usedSlot = filledSlot;
@@ -1897,7 +1935,10 @@ void GLPipelineStateViewer::setState()
             new RDTreeWidgetItem({slot, ds, typeName, w, h, d, a, format, QString()});
 
         if(tex)
+        {
+          setViewDetails(node, tex, mip, 1);
           node->setTag(QVariant::fromValue(ds));
+        }
 
         if(ds == ResourceId())
           setEmptyRow(node);
@@ -2680,7 +2721,7 @@ void GLPipelineStateViewer::exportHTML(QXmlStreamWriter &xml, const GLPipe::Shad
           }
         }
 
-        textureRows.push_back({slotname, name, typeName, w, h, d, a, format});
+        textureRows.push_back({slotname, name, typeName, w, h, d, a, format, r.firstMip, r.numMips});
       }
 
       // do sampler
@@ -2939,9 +2980,10 @@ void GLPipelineStateViewer::exportHTML(QXmlStreamWriter &xml, const GLPipe::Shad
     xml.writeCharacters(tr("Textures"));
     xml.writeEndElement();
 
-    m_Common.exportHTMLTable(xml, {tr("Slot"), tr("Name"), tr("Type"), tr("Width"), tr("Height"),
-                                   tr("Depth"), tr("Array Size"), tr("Format")},
-                             textureRows);
+    m_Common.exportHTMLTable(
+        xml, {tr("Slot"), tr("Name"), tr("Type"), tr("Width"), tr("Height"), tr("Depth"),
+              tr("Array Size"), tr("Format"), tr("First Mip"), tr("Num Mips")},
+        textureRows);
   }
 
   {

qrenderdoc/Windows/PipelineState/GLPipelineStateViewer.h

@@ -105,6 +105,9 @@ private:
 
   bool showNode(bool usedSlot, bool filledSlot);
 
+  void setViewDetails(RDTreeWidgetItem *node, TextureDescription *tex, uint32_t firstMip,
+                      uint32_t numMips);
+
   void exportHTML(QXmlStreamWriter &xml, const GLPipe::VertexInput &vtx);
   void exportHTML(QXmlStreamWriter &xml, const GLPipe::Shader &sh);
   void exportHTML(QXmlStreamWriter &xml, const GLPipe::Feedback &xfb);