--- /dev/null
+
+// Copyright (C) 2008 - 2009 Mathias Froehlich - Mathias.Froehlich@web.de
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+
+#ifndef SimGear_BoundingVolumeBuildVisitor_hxx
+#define SimGear_BoundingVolumeBuildVisitor_hxx
+
+#include <osg/Camera>
+#include <osg/Drawable>
+#include <osg/Geode>
+#include <osg/Group>
+#include <osg/MatrixTransform>
+#include <osg/PagedLOD>
+#include <osg/Transform>
+#include <osg/TriangleFunctor>
+
+#include <simgear/scene/material/mat.hxx>
+#include <simgear/scene/material/matlib.hxx>
+#include <simgear/scene/util/SGNodeMasks.hxx>
+#include <simgear/scene/util/SGSceneUserData.hxx>
+#include <simgear/math/SGGeometry.hxx>
+
+#include <simgear/scene/bvh/BVHStaticGeometryBuilder.hxx>
+
+namespace simgear {
+
+class BoundingVolumeBuildVisitor : public osg::NodeVisitor {
+public:
+ class PFunctor : public osg::PrimitiveFunctor {
+ public:
+ PFunctor() :
+ _modeCache(0)
+ {
+ _geometryBuilder = new BVHStaticGeometryBuilder;
+ }
+ virtual ~PFunctor()
+ { }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec2* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0], vertices[i][1], 0);
+ }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec3* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0], vertices[i][1], vertices[i][2]);
+ }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec4* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0]/vertices[i][3],
+ vertices[i][1]/vertices[i][3],
+ vertices[i][2]/vertices[i][3]);
+ }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec2d* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0], vertices[i][1], 0);
+ }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec3d* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0], vertices[i][1], vertices[i][2]);
+ }
+
+ virtual void setVertexArray(unsigned int count, const osg::Vec4d* vertices)
+ {
+ _vertices.resize(count);
+ for (unsigned i = 0; i < count; ++i)
+ _vertices[i] = SGVec3f(vertices[i][0]/vertices[i][3],
+ vertices[i][1]/vertices[i][3],
+ vertices[i][2]/vertices[i][3]);
+ }
+
+ virtual void drawArrays(GLenum mode, GLint first, GLsizei count)
+ {
+ if (_vertices.empty() || count==0)
+ return;
+
+ switch(mode) {
+ case (GL_TRIANGLES):
+ for (GLsizei i = first; i < first + count; i += 3) {
+ addTriangle(i, i + 1, i + 2);
+ }
+ break;
+
+ case (GL_TRIANGLE_STRIP):
+ for (GLsizei i = 0; i < count; i += 3) {
+ if (i%2)
+ addTriangle(first + i, first + i + 2, first + i + 1);
+ else
+ addTriangle(first + i, first + i + 1, first + i + 2);
+ }
+ break;
+
+ case (GL_QUADS):
+ for (GLsizei i = first; i < first + count; i += 4) {
+ addQuad(i, i + 1, i + 2, i + 3);
+ }
+ break;
+
+ case (GL_QUAD_STRIP):
+ for (GLsizei i = 0; i < count - 2; i += 2) {
+ if (i%4)
+ addQuad(first + i + 1, first + i, i + 3, first + i + 2);
+ else
+ addQuad(first + i, first + i + 1, first + i + 2, first + i + 3);
+ }
+ break;
+
+ case (GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
+ case (GL_TRIANGLE_FAN):
+ for (GLsizei i = first + 2; i < first + count; ++i) {
+ addTriangle(first, i - 1, i);
+ }
+ break;
+
+ case (GL_POINTS):
+ for (GLsizei i = 0; i < count; ++i) {
+ addPoint(first + i);
+ }
+ break;
+
+ case (GL_LINES):
+ for (GLsizei i = first; i < first + count; i += 2) {
+ addLine(i, i + 1);
+ }
+ break;
+
+ case (GL_LINE_STRIP):
+ for (GLsizei i = first; i < first + count; ++i) {
+ addLine(i, i + 1);
+ }
+ break;
+
+ case (GL_LINE_LOOP):
+ for (GLsizei i = first; i < first + count; ++i) {
+ addLine(i, i + 1);
+ }
+ addLine(first + count - 1, first);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ virtual void drawElements(GLenum mode, GLsizei count, const GLubyte* indices)
+ {
+ drawElementsTemplate(mode, count, indices);
+ }
+
+ virtual void drawElements(GLenum mode, GLsizei count, const GLushort* indices)
+ {
+ drawElementsTemplate(mode, count, indices);
+ }
+
+ virtual void drawElements(GLenum mode, GLsizei count, const GLuint* indices)
+ {
+ drawElementsTemplate(mode, count, indices);
+ }
+
+ virtual void begin(GLenum mode)
+ {
+ _modeCache = mode;
+ _vertices.resize(0);
+ }
+
+ virtual void vertex(const osg::Vec2& v)
+ {
+ _vertices.push_back(SGVec3f(v[0], v[1], 0));
+ }
+ virtual void vertex(const osg::Vec3& v)
+ {
+ _vertices.push_back(SGVec3f(v[0], v[1], v[2]));
+ }
+ virtual void vertex(const osg::Vec4& v)
+ {
+ _vertices.push_back(SGVec3f(v[0]/v[3], v[1]/v[3], v[2]/v[3]));
+ }
+ virtual void vertex(float x, float y)
+ {
+ _vertices.push_back(SGVec3f(x, y, 0));
+ }
+ virtual void vertex(float x, float y, float z)
+ {
+ _vertices.push_back(SGVec3f(x, y, z));
+ }
+ virtual void vertex(float x, float y, float z, float w)
+ {
+ _vertices.push_back(SGVec3f(x/w, y/w, z/w));
+ }
+ virtual void end()
+ {
+ if (_vertices.empty())
+ return;
+
+ drawArrays(_modeCache, 0, _vertices.size());
+ }
+
+ template<typename index_type>
+ void drawElementsTemplate(GLenum mode, GLsizei count,
+ const index_type* indices)
+ {
+ if (_vertices.empty() || indices == 0 || count == 0)
+ return;
+
+ switch(mode) {
+ case (GL_TRIANGLES):
+ for (GLsizei i = 0; i < count; i += 3) {
+ addTriangle(indices[i], indices[i + 1], indices[i + 2]);
+ }
+ break;
+
+ case (GL_TRIANGLE_STRIP):
+ for (GLsizei i = 2; i < count; ++i) {
+ if (i%2)
+ addTriangle(indices[i - 2], indices[i], indices[i - 1]);
+ else
+ addTriangle(indices[i - 2], indices[i - 1], indices[i]);
+ }
+ break;
+
+ case (GL_QUADS):
+ for (GLsizei i = 0; i < count; i += 4) {
+ addQuad(indices[i], indices[i + 1], indices[i + 2], indices[i + 3]);
+ }
+ break;
+
+ case (GL_QUAD_STRIP):
+ for (GLsizei i = 3; i < count; i += 2) {
+ if (i%4)
+ addQuad(indices[i - 2], indices[i - 3], indices[i], indices[i - 1]);
+ else
+ addQuad(indices[i - 3], indices[i - 2], indices[i - 1], indices[i]);
+ }
+ break;
+
+ case (GL_POLYGON):
+ case (GL_TRIANGLE_FAN):
+ for (GLsizei i = 2; i < count; ++i) {
+ addTriangle(indices[0], indices[i - 1], indices[i]);
+ }
+ break;
+
+ case (GL_POINTS):
+ for(GLsizei i = 0; i < count; ++i) {
+ addPoint(indices[i]);
+ }
+ break;
+
+ case (GL_LINES):
+ for (GLsizei i = 0; i < count; i += 2) {
+ addLine(indices[i], indices[i + 1]);
+ }
+ break;
+
+ case (GL_LINE_STRIP):
+ for (GLsizei i = 0; i < count; ++i) {
+ addLine(indices[i], indices[i + 1]);
+ }
+ break;
+
+ case (GL_LINE_LOOP):
+ for (GLsizei i = 0; i < count; ++i) {
+ addLine(indices[i], indices[i + 1]);
+ }
+ addLine(indices[count - 1], indices[0]);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ void addPoint(unsigned i1)
+ {
+ addPoint(_vertices[i1]);
+ }
+ void addLine(unsigned i1, unsigned i2)
+ {
+ addLine(_vertices[i1], _vertices[i2]);
+ }
+ void addTriangle(unsigned i1, unsigned i2, unsigned i3)
+ {
+ addTriangle(_vertices[i1], _vertices[i2], _vertices[i3]);
+ }
+ void addQuad(unsigned i1, unsigned i2, unsigned i3, unsigned i4)
+ {
+ addQuad(_vertices[i1], _vertices[i2], _vertices[i3], _vertices[i4]);
+ }
+
+ void addPoint(const SGVec3f& v1)
+ {
+ }
+ void addLine(const SGVec3f& v1, const SGVec3f& v2)
+ {
+ }
+ void addTriangle(const SGVec3f& v1, const SGVec3f& v2, const SGVec3f& v3)
+ {
+ _geometryBuilder->addTriangle(v1, v2, v3);
+ }
+ void addQuad(const SGVec3f& v1, const SGVec3f& v2,
+ const SGVec3f& v3, const SGVec3f& v4)
+ {
+ _geometryBuilder->addTriangle(v1, v2, v3);
+ _geometryBuilder->addTriangle(v1, v3, v4);
+ }
+
+ BVHNode* buildTreeAndClear()
+ {
+ BVHNode* bvNode = _geometryBuilder->buildTree();
+ _geometryBuilder = new BVHStaticGeometryBuilder;
+ _vertices.clear();
+ return bvNode;
+ }
+
+ void swap(PFunctor& primitiveFunctor)
+ {
+ _vertices.swap(primitiveFunctor._vertices);
+ std::swap(_modeCache, primitiveFunctor._modeCache);
+ std::swap(_geometryBuilder, primitiveFunctor._geometryBuilder);
+ }
+
+ void setCurrentMaterial(const SGMaterial* material)
+ {
+ _geometryBuilder->setCurrentMaterial(material);
+ }
+ const SGMaterial* getCurrentMaterial() const
+ {
+ return _geometryBuilder->getCurrentMaterial();
+ }
+
+ std::vector<SGVec3f> _vertices;
+ GLenum _modeCache;
+
+ SGSharedPtr<BVHStaticGeometryBuilder> _geometryBuilder;
+ };
+
+
+ // class PrimitiveIndexFunctor
+ // {
+ // public:
+
+ // virtual ~PrimitiveIndexFunctor() {}
+
+ // virtual void setVertexArray(unsigned int count,const Vec2* vertices) = 0;
+ // virtual void setVertexArray(unsigned int count,const Vec3* vertices) = 0;
+ // virtual void setVertexArray(unsigned int count,const Vec4* vertices) = 0;
+
+ // virtual void setVertexArray(unsigned int count,const Vec2d* vertices) = 0;
+ // virtual void setVertexArray(unsigned int count,const Vec3d* vertices) = 0;
+ // virtual void setVertexArray(unsigned int count,const Vec4d* vertices) = 0;
+
+ // virtual void drawArrays(GLenum mode,GLint first,GLsizei count) = 0;
+ // virtual void drawElements(GLenum mode,GLsizei count,const GLubyte* indices) = 0;
+ // virtual void drawElements(GLenum mode,GLsizei count,const GLushort* indices) = 0;
+ // virtual void drawElements(GLenum mode,GLsizei count,const GLuint* indices) = 0;
+
+ // virtual void begin(GLenum mode) = 0;
+ // virtual void vertex(unsigned int pos) = 0;
+ // virtual void end() = 0;
+ // };
+
+ BoundingVolumeBuildVisitor() :
+ osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN)
+ {
+ setTraversalMask(SG_NODEMASK_TERRAIN_BIT);
+ }
+ ~BoundingVolumeBuildVisitor()
+ {
+ }
+
+ const SGMaterial* pushMaterial(osg::StateSet* stateSet)
+ {
+ const SGMaterial* oldMaterial = _primitiveFunctor.getCurrentMaterial();
+ const SGMaterial* material = SGMaterialLib::findMaterial(stateSet);
+ if (material)
+ _primitiveFunctor.setCurrentMaterial(material);
+ return oldMaterial;
+ }
+
+ void fillWith(osg::Drawable* drawable)
+ {
+ const SGMaterial* oldMaterial = pushMaterial(drawable->getStateSet());
+ drawable->accept(_primitiveFunctor);
+ _primitiveFunctor.setCurrentMaterial(oldMaterial);
+ }
+
+ virtual void apply(osg::Geode& geode)
+ {
+ const SGMaterial* oldMaterial = pushMaterial(geode.getStateSet());
+
+ if (!hasBoundingVolumeTree(geode))
+ for(unsigned i = 0; i < geode.getNumDrawables(); ++i)
+ fillWith(geode.getDrawable(i));
+
+ // Flush the bounding volume tree if we reached the topmost group
+ if (getNodePath().size() <= 1)
+ addBoundingVolumeTreeToNode(geode);
+ _primitiveFunctor.setCurrentMaterial(oldMaterial);
+ }
+
+ virtual void apply(osg::Group& group)
+ {
+ // Note that we do not need to push the already collected list of
+ // primitives, since we are now in the topmost node ...
+
+ const SGMaterial* oldMaterial = pushMaterial(group.getStateSet());
+
+ if (!hasBoundingVolumeTree(group))
+ traverse(group);
+
+ // Flush the bounding volume tree if we reached the topmost group
+ if (getNodePath().size() <= 1)
+ addBoundingVolumeTreeToNode(group);
+
+ _primitiveFunctor.setCurrentMaterial(oldMaterial);
+ }
+
+ virtual void apply(osg::Transform& transform)
+ {
+ // push the current active primitive list
+ PFunctor previousPrimitives;
+ _primitiveFunctor.swap(previousPrimitives);
+
+ const SGMaterial* oldMaterial = pushMaterial(transform.getStateSet());
+
+ // walk the children
+ if (!hasBoundingVolumeTree(transform))
+ traverse(transform);
+
+ // We know whenever we see a transform, we need to flush the
+ // collected bounding volume tree since these transforms are not
+ // handled by the plain leafs.
+ addBoundingVolumeTreeToNode(transform);
+
+ _primitiveFunctor.setCurrentMaterial(oldMaterial);
+
+ // pop the current active primitive list
+ _primitiveFunctor.swap(previousPrimitives);
+ }
+
+ virtual void apply(osg::PagedLOD&)
+ {
+ // Do nothing. In this case we get called by the loading process anyway
+ }
+
+ virtual void apply(osg::Camera& camera)
+ {
+ if (camera.getRenderOrder() != osg::Camera::NESTED_RENDER)
+ return;
+ apply(static_cast<osg::Transform&>(camera));
+ }
+
+ void addBoundingVolumeTreeToNode(osg::Node& node)
+ {
+ // Build the flat tree.
+ BVHNode* bvNode = _primitiveFunctor.buildTreeAndClear();
+
+ // Nothing in there?
+ if (!bvNode)
+ return;
+
+ SGSceneUserData* userData;
+ userData = SGSceneUserData::getOrCreateSceneUserData(&node);
+ userData->setBVHNode(bvNode);
+ }
+
+ bool hasBoundingVolumeTree(osg::Node& node)
+ {
+ SGSceneUserData* userData;
+ userData = SGSceneUserData::getSceneUserData(&node);
+ if (!userData)
+ return false;
+ if (!userData->getBVHNode())
+ return false;
+ return true;
+ }
+
+private:
+ PFunctor _primitiveFunctor;
+};
+
+}
+
+#endif
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