add option to set vertex normal interpolation qualifier

libs_required/ACG/GL/RenderObject.cc

@@ -162,6 +162,9 @@ void RenderObject::setupShaderGenFromDrawmode( const SceneGraph::DrawModes::Draw
     if (_props->flatShaded())
       shaderDesc.shadeMode = SG_SHADE_FLAT;
 
+    if (_props->normalSource() == SceneGraph::DrawModes::NORMAL_PER_FACE)
+      shaderDesc.vertexNormalInterpolator = "flat";
+
     if (_props->primitive() == SceneGraph::DrawModes::PRIMITIVE_WIREFRAME ||
         _props->primitive() == SceneGraph::DrawModes::PRIMITIVE_HIDDENLINE ||
         _props->primitive() == SceneGraph::DrawModes::PRIMITIVE_EDGE ||

libs_required/ACG/GL/ShaderGenerator.cc

@@ -178,11 +178,10 @@ void ShaderGenerator::initVertexShaderIO(const ShaderGenDesc* _desc, const Defau
     addInput("vec4", keywords.vs_inputColor);
 
   if (_iodesc->passNormalVS_)
-    addOutput("vec3", keywords.vs_outputNormalVS);
+    addStringToList("vec3 " + keywords.vs_outputNormalVS, &outputs_, _desc->vertexNormalInterpolator + " out ", ";");
 
   if (_iodesc->passNormalOS_)
-    addOutput("vec3", keywords.vs_outputNormalOS);
-
+    addStringToList("vec3 " + keywords.vs_outputNormalOS, &outputs_, _desc->vertexNormalInterpolator + " out ", ";");
 
   // vertex color output
 

libs_required/ACG/GL/ShaderGenerator.hh

@@ -170,6 +170,9 @@ public:
   /// interpolation qualifier for input vertex colors: "flat", "smooth", "noperspective"
   QString vertexColorsInterpolator;
 
+  /// interpolation qualifier for vertex shader normal outputs: "flat", "smooth", "noperspective"
+  QString vertexNormalInterpolator;
+
   // color material for input vertex colors: GL_EMISSION, GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_AMBIENT_AND_DIFFUSE
   // Usage of vertex colors in lighting function, as diffuse, emission, ambient color ..  see glColorMaterial()
   // default: GL_AMBIENT_AND_DIFFUSE
@@ -309,6 +312,9 @@ public:
     if (shaderMods != _rhs.shaderMods)
       return false;
 
+    if (vertexNormalInterpolator != _rhs.vertexNormalInterpolator)
+      return false;
+
     if (numLights)
       return memcmp(lightTypes, _rhs.lightTypes, numLights * sizeof(ShaderGenLightType)) == 0;
 

libs_required/ACG/Scenegraph/MeshNode2T.cc

@@ -773,6 +773,9 @@ void ACG::SceneGraph::MeshNodeT<Mesh>::getRenderObjects( IRenderer* _renderer, G
     if (props->flatShaded())
       ro.shaderDesc.shadeMode = SG_SHADE_FLAT;
 
+    if (props->normalSource() == DrawModes::NORMAL_PER_FACE)
+      ro.shaderDesc.vertexNormalInterpolator = "flat";
+
     // handle 'special' primitives (wireframe, hiddenline, primitives in sysmem buffers)..
 
     if (props->primitive() == DrawModes::PRIMITIVE_WIREFRAME)