Added experimental OpenGL shader path for positioning of trees (doens't work yet though..)
This commit is contained in:
Robert Osfield
parent
708b6f5530
commit
8bc1910767
@ -101,12 +101,15 @@ public:
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osg::Geometry* createSprite( float w, float h, osg::UByte4 color );
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osg::Geometry* createOrthogonalQuads( const osg::Vec3& pos, float w, float h, osg::UByte4 color );
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osg::Geometry* createOrthogonalQuadsNoColor( const osg::Vec3& pos, float w, float h );
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osg::Node* createBillboardGraph(Cell* cell,osg::StateSet* stateset);
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osg::Node* createXGraph(Cell* cell,osg::StateSet* stateset);
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osg::Node* createTransformGraph(Cell* cell,osg::StateSet* stateset);
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osg::Node* createShaderGraph(Cell* cell,osg::StateSet* stateset);
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osg::Node* createHUDWithText(const std::string& text);
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@ -712,6 +715,170 @@ osg::Node* ForestTechniqueManager::createTransformGraph(Cell* cell,osg::StateSet
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else return transform_group;
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}
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osg::Geometry* ForestTechniqueManager::createOrthogonalQuadsNoColor( const osg::Vec3& pos, float w, float h)
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{
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// set up the coords
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osg::Vec3Array& v = *(new osg::Vec3Array(8));
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osg::Vec2Array& t = *(new osg::Vec2Array(8));
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float rotation = random(0.0f,osg::PI/2.0f);
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float sw = sinf(rotation)*w*0.5f;
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float cw = cosf(rotation)*w*0.5f;
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v[0].set(pos.x()-sw,pos.y()-cw,pos.z()+0.0f);
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v[1].set(pos.x()+sw,pos.y()+cw,pos.z()+0.0f);
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v[2].set(pos.x()+sw,pos.y()+cw,pos.z()+h);
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v[3].set(pos.x()-sw,pos.y()-cw,pos.z()+h);
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v[4].set(pos.x()-cw,pos.y()+sw,pos.z()+0.0f);
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v[5].set(pos.x()+cw,pos.y()-sw,pos.z()+0.0f);
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v[6].set(pos.x()+cw,pos.y()-sw,pos.z()+h);
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v[7].set(pos.x()-cw,pos.y()+sw,pos.z()+h);
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t[0].set(0.0f,0.0f);
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t[1].set(1.0f,0.0f);
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t[2].set(1.0f,1.0f);
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t[3].set(0.0f,1.0f);
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t[4].set(0.0f,0.0f);
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t[5].set(1.0f,0.0f);
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t[6].set(1.0f,1.0f);
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t[7].set(0.0f,1.0f);
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osg::Geometry *geom = new osg::Geometry;
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geom->setVertexArray( &v );
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geom->setTexCoordArray( 0, &t );
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geom->addPrimitiveSet( new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,8) );
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return geom;
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}
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class ShaderGeometry : public osg::Drawable
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{
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public:
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ShaderGeometry() { setUseDisplayList(false); }
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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ShaderGeometry(const ShaderGeometry& ShaderGeometry,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Drawable(ShaderGeometry,copyop) {}
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META_Object(osg,ShaderGeometry)
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typedef std::vector<osg::Vec4> PositionSizeList;
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virtual void drawImplementation(osg::State& state) const
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{
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for(PositionSizeList::const_iterator itr = _trees.begin();
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itr != _trees.end();
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++itr)
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{
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#if 0
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glColor4fv(itr->ptr());
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_geometry->drawImplementation(state);
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#else
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glPushMatrix();
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glTranslatef((*itr)[0], (*itr)[1], (*itr)[2]);
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glScalef( (*itr)[3],(*itr)[3],(*itr)[3] );
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_geometry->drawImplementation(state);
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glPopMatrix();
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#endif
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}
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}
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virtual osg::BoundingBox computeBound() const
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{
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osg::BoundingBox geom_box = _geometry->getBound();
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osg::BoundingBox bb;
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for(PositionSizeList::const_iterator itr = _trees.begin();
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itr != _trees.end();
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++itr)
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{
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bb.expandBy(geom_box.corner(0)*(*itr)[3] +
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osg::Vec3( (*itr)[0], (*itr)[1], (*itr)[2] ));
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bb.expandBy(geom_box.corner(7)*(*itr)[3] +
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osg::Vec3( (*itr)[0], (*itr)[1], (*itr)[2] ));
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}
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return bb;
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}
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void setGeometry(osg::Geometry* geometry)
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{
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_geometry = geometry;
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}
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void addTree(ForestTechniqueManager::Tree& tree)
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{
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_trees.push_back(osg::Vec4(tree._position.x(), tree._position.y(), tree._position.z(), tree._height));
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}
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osg::ref_ptr<osg::Geometry> _geometry;
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PositionSizeList _trees;
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protected:
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virtual ~ShaderGeometry() {}
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};
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osg::Geometry* shared_geometry = 0;
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osg::Node* ForestTechniqueManager::createShaderGraph(Cell* cell,osg::StateSet* stateset)
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{
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if (shared_geometry==0)
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{
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shared_geometry = createOrthogonalQuadsNoColor(osg::Vec3(0.0f,0.0f,0.0f),1.0f,1.0f);
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//shared_geometry->setUseDisplayList(false);
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}
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bool needGroup = !(cell->_cells.empty());
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bool needTrees = !(cell->_trees.empty());
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osg::Geode* geode = 0;
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osg::Group* group = 0;
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if (needTrees)
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{
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geode = new osg::Geode;
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ShaderGeometry* shader_geometry = new ShaderGeometry;
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shader_geometry->setGeometry(shared_geometry);
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for(TreeList::iterator itr=cell->_trees.begin();
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itr!=cell->_trees.end();
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++itr)
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{
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Tree& tree = **itr;
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shader_geometry->addTree(tree);
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}
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geode->setStateSet(stateset);
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geode->addDrawable(shader_geometry);
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}
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if (needGroup)
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{
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group = new osg::Group;
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for(Cell::CellList::iterator itr=cell->_cells.begin();
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itr!=cell->_cells.end();
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++itr)
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{
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group->addChild(createShaderGraph(itr->get(),stateset));
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}
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if (geode) group->addChild(geode);
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}
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if (group) return group;
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else return geode;
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}
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osg::Node* ForestTechniqueManager::createHUDWithText(const std::string& str)
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{
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osg::Geode* geode = new osg::Geode();
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@ -804,7 +971,7 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
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std::cout<<"Creating billboard based forest...";
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osg::Group* group = new osg::Group;
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group->addChild(createBillboardGraph(cell.get(),dstate));
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group->addChild(createHUDWithText("Using osg::Billboard's to create a forest\n\nPress left cursor key to select osg::MatrixTransform based forest\nPress right cursor key to select double quad based forest"));
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group->addChild(createHUDWithText("Using osg::Billboard's to create a forest\n\nPress left cursor key to select OpenGL shader based forest\nPress right cursor key to select double quad based forest"));
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_techniqueSwitch->addChild(group);
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std::cout<<"done."<<std::endl;
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}
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@ -822,11 +989,62 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
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std::cout<<"Creating billboard based forest...";
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osg::Group* group = new osg::Group;
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group->addChild(createTransformGraph(cell.get(),dstate));
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group->addChild(createHUDWithText("Using osg::MatrixTransform's to create a forest\n\nPress left cursor key to select double quad based forest\nPress right cursor key to select osg::Billboard based forest"));
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group->addChild(createHUDWithText("Using osg::MatrixTransform's to create a forest\n\nPress left cursor key to select double quad based forest\nPress right cursor key to select OpenGL shder based forest"));
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_techniqueSwitch->addChild(group);
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std::cout<<"done."<<std::endl;
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}
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{
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osg::Group* group = new osg::Group;
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osg::StateSet* stateset = new osg::StateSet;
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stateset->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON );
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stateset->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
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{
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///////////////////////////////////////////////////////////////////
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// vertex shader using just Vec4 coefficients
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char vertexShaderSource[] =
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"void main(void) \n"
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"{ \n"
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"\n"
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" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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"}\n";
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//////////////////////////////////////////////////////////////////
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// fragment shader
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//
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char fragmentShaderSource[] =
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"uniform sampler2D baseTexture; \n"
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"\n"
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"void main(void) \n"
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"{ \n"
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" gl_FragColor = texture2D( baseTexture, gl_TexCoord[0].xy); \n"
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"}\n";
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osg::Program* program = new osg::Program;
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stateset->setAttribute(program);
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osg::Shader* vertex_shader = new osg::Shader(osg::Shader::VERTEX, vertexShaderSource);
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program->addShader(vertex_shader);
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osg::Shader* fragment_shader = new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource);
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program->addShader(fragment_shader);
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osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
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stateset->addUniform(baseTextureSampler);
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}
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std::cout<<"Creating billboard based forest...";
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group->addChild(createShaderGraph(cell.get(),stateset));
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group->addChild(createHUDWithText("Using OpenGL Shader to create a forest\n\nPress left cursor key to select osg::MatrixTransform based forest\nPress right cursor key to select osg::Billboard based forest"));
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_techniqueSwitch->addChild(group);
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std::cout<<"done."<<std::endl;
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}
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_currentTechnique = 0;
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_techniqueSwitch->setSingleChildOn(_currentTechnique);
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