Method processVert

Engine/source/forest/glsl/windDeformationGLSL.cpp:79–199

}

void WindDeformationGLSL::processVert( Vector<ShaderComponent*> &componentList, 
                                       const MaterialFeatureData &fd )
{
   MultiLine *meta = new MultiLine;
   output = meta;

   // We combined all the tree parameters into one float4 to
   // save constant space and reduce the memory copied to the
   // card.
   //
   // .x = bend scale
   // .y = branch amplitude
   // .z = detail amplitude
   // .w = detail frequency
   //
   Var *windParams = new Var( "windParams", "vec4" );
      windParams->uniform = true;
      windParams->constSortPos = cspPotentialPrimitive;

   // If we're instancing then we need to instance the wind direction
   // and speed as its unique for each tree instance.
   Var *windDirAndSpeed;
   if ( fd.features[MFT_UseInstancing] ) 
   {
      ShaderConnector *vertStruct = dynamic_cast<ShaderConnector *>( componentList[C_VERT_STRUCT] );
      windDirAndSpeed = vertStruct->getElement( RT_TEXCOORD );
      windDirAndSpeed->setStructName( "IN" );
      windDirAndSpeed->setName( "inst_windDirAndSpeed" );
      windDirAndSpeed->setType( "vec3" );

      mInstancingFormat->addElement( "windDirAndSpeed", GFXDeclType_Float3, windDirAndSpeed->constNum );
   }
   else
   {
      windDirAndSpeed = new Var( "windDirAndSpeed", "vec3" );
      windDirAndSpeed->uniform = true;
      windDirAndSpeed->constSortPos = cspPrimitive;
   }

   Var *accumTime = (Var*)LangElement::find( "accumTime" );
   if ( !accumTime )
   {
      accumTime = new Var( "accumTime", "float" );
      accumTime->uniform = true;
      accumTime->constSortPos = cspPass;  
   }

   // Get the transform to world space.
   Var *objTrans = getObjTrans( componentList, fd.features[MFT_UseInstancing], meta );

   // First check for an input position from a previous feature
   // then look for the default vertex position.
   Var *inPosition = (Var*)LangElement::find( "inPosition" );
   if ( !inPosition )
      inPosition = (Var*)LangElement::find( "position" );

   // Copy the input position to the output first as 
   // the wind effects are conditional.