mirror of https://github.com/OpenMW/openmw.git
terrain: use a custom drawable for multi-pass render instead of osgFX::Effect
osgFX::Effect is awkward to use because of the lazy-definition of passes, no support for compileGLObjects, useless 'Technique' abstraction and having to define silly methods like 'effectAuthor()' Handling the multi-pass rendering inside the Drawable also avoids redundant culling tests against the same bounding box for each pass.pull/1225/head
scrawl
8 years ago
parent
34130fc5cc
commit
eef63a880a
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#include "terraindrawable.hpp"
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#include <osgUtil/CullVisitor>
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#include <components/sceneutil/lightmanager.hpp>
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namespace Terrain
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{
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TerrainDrawable::TerrainDrawable()
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{
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mLightListCallback = new SceneUtil::LightListCallback;
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}
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TerrainDrawable::TerrainDrawable(const TerrainDrawable ©, const osg::CopyOp ©op)
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: osg::Geometry(copy, copyop)
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, mPasses(copy.mPasses)
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, mLightListCallback(copy.mLightListCallback)
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{
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}
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void TerrainDrawable::accept(osg::NodeVisitor &nv)
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{
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if (nv.getVisitorType() != osg::NodeVisitor::CULL_VISITOR)
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{
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osg::Geometry::accept(nv);
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}
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else if (nv.validNodeMask(*this))
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{
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nv.pushOntoNodePath(this);
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cull(static_cast<osgUtil::CullVisitor*>(&nv));
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nv.popFromNodePath();
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}
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}
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inline float distance(const osg::Vec3& coord,const osg::Matrix& matrix)
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{
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return -((float)coord[0]*(float)matrix(0,2)+(float)coord[1]*(float)matrix(1,2)+(float)coord[2]*(float)matrix(2,2)+matrix(3,2));
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}
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void TerrainDrawable::cull(osgUtil::CullVisitor *cv)
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{
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const osg::BoundingBox& bb = getBoundingBox();
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if (cv->isCulled(getBoundingBox()))
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return;
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osg::RefMatrix& matrix = *cv->getModelViewMatrix();
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float depth = bb.valid() ? distance(bb.center(),matrix) : 0.0f;
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if (osg::isNaN(depth))
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return;
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bool pushedLight = mLightListCallback->pushLightState(this, cv);
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for (PassVector::const_iterator it = mPasses.begin(); it != mPasses.end(); ++it)
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{
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cv->pushStateSet(*it);
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cv->addDrawableAndDepth(this, &matrix, depth);
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cv->popStateSet();
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}
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if (pushedLight)
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cv->popStateSet();
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}
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void TerrainDrawable::setPasses(const TerrainDrawable::PassVector &passes)
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{
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mPasses = passes;
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}
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void TerrainDrawable::compileGLObjects(osg::RenderInfo &renderInfo) const
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{
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for (PassVector::const_iterator it = mPasses.begin(); it != mPasses.end(); ++it)
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{
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osg::StateSet* stateset = *it;
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stateset->compileGLObjects(*renderInfo.getState());
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}
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osg::Geometry::compileGLObjects(renderInfo);
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}
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}
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@ -0,0 +1,51 @@
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#ifndef OPENMW_COMPONENTS_TERRAIN_DRAWABLE_H
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#define OPENMW_COMPONENTS_TERRAIN_DRAWABLE_H
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#include <osg/Geometry>
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namespace osgUtil
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{
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class CullVisitor;
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}
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namespace SceneUtil
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{
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class LightListCallback;
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}
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namespace Terrain
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{
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/**
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* Subclass of Geometry that supports built in multi-pass rendering and built in LightListCallback.
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*/
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class TerrainDrawable : public osg::Geometry
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{
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public:
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virtual osg::Object* cloneType() const { return new TerrainDrawable (); }
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virtual osg::Object* clone(const osg::CopyOp& copyop) const { return new TerrainDrawable (*this,copyop); }
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const TerrainDrawable *>(obj)!=NULL; }
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virtual const char* className() const { return "TerrainDrawable"; }
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virtual const char* libraryName() const { return "Terrain"; }
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TerrainDrawable();
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TerrainDrawable(const TerrainDrawable& copy, const osg::CopyOp& copyop);
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virtual void accept(osg::NodeVisitor &nv);
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void cull(osgUtil::CullVisitor* cv);
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typedef std::vector<osg::ref_ptr<osg::StateSet> > PassVector;
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void setPasses (const PassVector& passes);
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virtual void compileGLObjects(osg::RenderInfo& renderInfo) const;
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private:
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PassVector mPasses;
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osg::ref_ptr<SceneUtil::LightListCallback> mLightListCallback;
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};
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}
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#endif
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