Initial commit of ResInsight version 0.4.8

VisualizationModules/LibViewing/cvfClipPlaneSet.cpp

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+//##################################################################################################
+//
+//   Custom Visualization Core library
+//   Copyright (C) 2011-2012 Ceetron AS
+//    
+//   This library is free software: you can redistribute it and/or modify 
+//   it under the terms of the GNU General Public License as published by 
+//   the Free Software Foundation, either version 3 of the License, or 
+//   (at your option) any later version. 
+//    
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY 
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or 
+//   FITNESS FOR A PARTICULAR PURPOSE.   
+//    
+//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>> 
+//   for more details. 
+//
+//##################################################################################################
+
+#include "cvfBase.h"
+#include "cvfClipPlaneSet.h"
+#include "cvfUniformSet.h"
+#include "cvfCamera.h"
+#include "cvfRendering.h"
+
+namespace cvf {
+
+
+//==================================================================================================
+///
+/// \class cvf::ClipPlaneSet
+/// \ingroup Viewing
+///
+/// A dynamic uniform set used to control model clipping. 
+/// 
+/// The class is a DynamicUniformSet capable of controlling up to 6 clipping planes. The purpose 
+/// of the class is provide two uniforms:
+/// * u_clipPlaneCount : the number of active clipping planes
+/// * u_ecClipPlanes : The clip planes in eye coordinates
+/// 
+/// A dynamic uniform is required as the clipping planes needs to be specified in eye coordinates, 
+/// and thus needs to be updated before each rendering.
+//==================================================================================================
+
+//--------------------------------------------------------------------------------------------------
+/// Constructor
+//--------------------------------------------------------------------------------------------------
+ClipPlaneSet::ClipPlaneSet()
+{
+    m_planeCountUniform = new UniformInt("u_clipPlaneCount", 0);
+    m_ecPlanesUniformArray = new UniformFloat("u_ecClipPlanes", Vec4f::ZERO);
+
+    m_combinedUniformSet = new UniformSet;
+    m_combinedUniformSet->setUniform(m_planeCountUniform.p());
+    m_combinedUniformSet->setUniform(m_ecPlanesUniformArray.p());
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Destructor
+//--------------------------------------------------------------------------------------------------
+ClipPlaneSet::~ClipPlaneSet()
+{
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Returns the number of planes currently specified
+//--------------------------------------------------------------------------------------------------
+size_t ClipPlaneSet::planeCount() const
+{
+    return m_wcPlanes.size();
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Add a clipping plane. Note that max 6 planes are supported
+//--------------------------------------------------------------------------------------------------
+void ClipPlaneSet::addPlane(const Plane& plane)
+{
+    CVF_ASSERT(planeCount() < 6);
+    m_wcPlanes.push_back(plane);
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Remove all specified clipping planes
+//--------------------------------------------------------------------------------------------------
+void ClipPlaneSet::clear()
+{
+    m_wcPlanes.clear();
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Pre-render update to transform the clipping planes into the correct eye coordinates.
+//--------------------------------------------------------------------------------------------------
+void ClipPlaneSet::update(Rendering* rendering) 
+{
+    const cvf::Camera* cam = rendering->camera();
+    CVF_ASSERT(cam);
+    const Mat4d& vm = cam->viewMatrix();
+
+    size_t planeCount = m_wcPlanes.size();
+    Vec4fArray planeArray;
+    if (planeCount > 0)
+    {
+        planeArray.resize(planeCount);
+        size_t i;
+        for (i = 0; i < planeCount; i++)
+        {
+            Plane ecPlane(m_wcPlanes[i]);
+            ecPlane.transform(vm);
+
+            Vec4d planeVec(ecPlane.A(), ecPlane.B(), ecPlane.C(), ecPlane.D());
+            planeArray[i] = Vec4f(planeVec);
+        }
+    }
+    else
+    {
+        // Insert a dummy
+        planeArray.resize(1);
+        planeArray[0] = Vec4f::ZERO;
+    }
+
+    m_planeCountUniform->set(static_cast<int>(planeCount));
+    m_ecPlanesUniformArray->setArray(planeArray);
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Get the combined uniform set consisting of the two uniforms u_clipPlaneCount and u_ecClipPlanes
+//--------------------------------------------------------------------------------------------------
+UniformSet* ClipPlaneSet::uniformSet() 
+{
+    return m_combinedUniformSet.p();
+}
+
+} // namespace cvf