fix compile error

libs_required/ACG/GL/ShaderGenerator.cc

@@ -1615,6 +1615,24 @@ void ShaderProgGenerator::buildGeometryShader()
     mainCode.push_back("gl_Position = gl_in[inIdx].gl_Position;");
     mainCode.push_back("gl_PrimitiveID = gl_PrimitiveIDIn;");
 
+
+    // built-in gl_ClipDistance[]
+    static int maxClipDistances = -1;
+    if (maxClipDistances < 0)
+    {
+#ifdef GL_MAX_CLIP_DISTANCES
+      glGetIntegerv(GL_MAX_CLIP_DISTANCES, &maxClipDistances);
+      maxClipDistances = std::min(maxClipDistances, 32); // clamp to 32 bits
+#else
+      maxClipDistances = 32;
+#endif
+    }
+    for (int i = 0; i < maxClipDistances; ++i)
+    {
+      if (desc_.clipDistanceMask & (1 << i))
+        mainCode.push_back(QString("gl_ClipDistance[%1] = gl_in[inIdx].gl_ClipDistance[%1];").arg(i));
+    }
+
     // custom IO
     for (int i = 0; i < geometry_->getNumInputs(); ++i)
     {
@@ -2720,7 +2738,7 @@ QString ShaderGenDesc::toString() const
 
   resStrm << "version: " << version;
 
-  resStrm << "shaderDesc.numLights: " << numLights;
+  resStrm << "\nshaderDesc.numLights: " << numLights;
 
   if (numLights)
   {

libs_required/ACG/GL/ShaderGenerator.hh

@@ -102,6 +102,7 @@ public:
     fragmentTemplateFile(""),
     normalizeTexColors(true),
     colorMaterialMode(GL_AMBIENT_AND_DIFFUSE),
+    clipDistanceMask(0),
     textureTypes_(),
     texGenDim(0),
     texGenMode(GL_EYE_LINEAR),
@@ -178,6 +179,11 @@ public:
   // default: GL_AMBIENT_AND_DIFFUSE
   GLenum colorMaterialMode;
 
+  // Bitmask of enabled hardware clip planes.
+  // Bit i represents the i'th clip plane starting at the least significant bit.
+  // This is needed to pass the gl_ClipDistance[] array through the geometry shader stage.
+  uint clipDistanceMask;
+
   struct TextureType
   {
     GLenum type;
@@ -279,6 +285,13 @@ public:
         return false;
     }
 
+    if (!geometryTemplateFile.isEmpty())
+    {
+      // clip distance mask only affects the geometry shader
+      if (clipDistanceMask != _rhs.clipDistanceMask)
+        return false;
+    }
+
     if (fragmentTemplateFile != _rhs.fragmentTemplateFile)
       return false;
 

libs_required/ACG/Scenegraph/ClippingNode.cc

@@ -248,6 +248,8 @@ void ClippingNode::ClippingObjectModifier::apply(RenderObject* _obj)
   // set shader modifier
   _obj->shaderDesc.shaderMods.push_back(shaderModID);
 
+  // enable clip distance pass through in geometry shader
+  _obj->shaderDesc.clipDistanceMask = _obj->clipDistanceMask;
 }
 
 //=============================================================================