Merge branch 'shadows-bin' into 'master'
Use a custom renderbin to avoid pointless OpenGL state switches See merge request OpenMW/openmw!402pull/593/head
AnyOldName3
4 years ago
commit
1e0df23d14
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#include "shadowsbin.hpp"
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#include <unordered_set>
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#include <osg/StateSet>
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#include <osg/Material>
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#include <osgUtil/StateGraph>
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using namespace osgUtil;
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namespace
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{
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template <typename T>
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inline void accumulateState(T& currentValue, T newValue, bool& isOverride, unsigned int overrideFlags)
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{
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if (isOverride && !(overrideFlags & osg::StateAttribute::PROTECTED)) return;
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if (overrideFlags & osg::StateAttribute::OVERRIDE)
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isOverride = true;
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currentValue = newValue;
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}
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inline void accumulateModeState(const osg::StateSet* ss, bool& currentValue, bool& isOverride, int mode)
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{
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const osg::StateSet::ModeList& l = ss->getModeList();
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osg::StateSet::ModeList::const_iterator mf = l.find(mode);
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if (mf == l.end())
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return;
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int flags = mf->second;
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bool newValue = flags & osg::StateAttribute::ON;
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accumulateState(currentValue, newValue, isOverride, ss->getMode(mode));
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}
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inline bool materialNeedShadows(osg::Material* m)
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{
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// I'm pretty sure this needs to check the colour mode - vertex colours might override this value.
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return m->getDiffuse(osg::Material::FRONT).a() > 0.5;
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}
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}
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namespace SceneUtil
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{
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ShadowsBin::ShadowsBin()
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{
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mNoTestStateSet = new osg::StateSet;
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mNoTestStateSet->addUniform(new osg::Uniform("useDiffuseMapForShadowAlpha", false));
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mNoTestStateSet->addUniform(new osg::Uniform("alphaTestShadows", false));
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mShaderAlphaTestStateSet = new osg::StateSet;
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mShaderAlphaTestStateSet->addUniform(new osg::Uniform("alphaTestShadows", true));
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mShaderAlphaTestStateSet->setMode(GL_BLEND, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
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}
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StateGraph* ShadowsBin::cullStateGraph(StateGraph* sg, StateGraph* root, std::unordered_set<StateGraph*>& uninterestingCache)
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{
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std::vector<StateGraph*> return_path;
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State state;
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StateGraph* sg_new = sg;
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do
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{
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if (uninterestingCache.find(sg_new) != uninterestingCache.end())
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break;
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return_path.push_back(sg_new);
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sg_new = sg_new->_parent;
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} while (sg_new && sg_new != root);
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for(auto itr=return_path.rbegin(); itr!=return_path.rend(); ++itr)
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{
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const osg::StateSet* ss = (*itr)->getStateSet();
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if (!ss)
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continue;
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accumulateModeState(ss, state.mAlphaBlend, state.mAlphaBlendOverride, GL_BLEND);
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accumulateModeState(ss, state.mAlphaTest, state.mAlphaTestOverride, GL_ALPHA_TEST);
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const osg::StateSet::AttributeList& attributes = ss->getAttributeList();
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osg::StateSet::AttributeList::const_iterator found = attributes.find(std::make_pair(osg::StateAttribute::MATERIAL, 0));
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if (found != attributes.end())
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{
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const osg::StateSet::RefAttributePair& rap = found->second;
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accumulateState(state.mMaterial, static_cast<osg::Material*>(rap.first.get()), state.mMaterialOverride, rap.second);
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if (state.mMaterial && !materialNeedShadows(state.mMaterial))
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state.mMaterial = nullptr;
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}
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// osg::FrontFace specifies triangle winding, not front-face culling. We can't safely reparent anything under it.
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found = attributes.find(std::make_pair(osg::StateAttribute::FRONTFACE, 0));
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if (found != attributes.end())
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state.mImportantState = true;
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if ((*itr) != sg && !state.interesting())
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uninterestingCache.insert(*itr);
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}
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if (!state.needShadows())
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return nullptr;
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if (!state.needTexture() && !state.mImportantState)
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{
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for (RenderLeaf* leaf : sg->_leaves)
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{
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leaf->_parent = root;
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root->_leaves.push_back(leaf);
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}
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return nullptr;
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}
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if (state.mAlphaBlend)
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{
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sg_new = sg->find_or_insert(mShaderAlphaTestStateSet);
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for (RenderLeaf* leaf : sg->_leaves)
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{
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leaf->_parent = sg_new;
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sg_new->_leaves.push_back(leaf);
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}
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return sg_new;
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}
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return sg;
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}
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bool ShadowsBin::State::needShadows() const
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{
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if (!mMaterial)
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return true;
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return materialNeedShadows(mMaterial);
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}
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void ShadowsBin::sortImplementation()
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{
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// The cull visitor contains a stategraph.
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// When a stateset is pushed, it's added/found as a child of the current stategraph node, then that node becomes the new current stategraph node.
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// When a drawable is added, the current stategraph node is added to the current renderbin (if it's not there already) and the drawable is added as a renderleaf to the stategraph
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// This means our list only contains stategraph nodes with directly-attached renderleaves, but they might have parents with more state set that needs to be considered.
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if (!_stateGraphList.size())
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return;
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StateGraph* root = _stateGraphList[0];
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while (root->_parent)
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{
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root = root->_parent;
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const osg::StateSet* ss = root->getStateSet();
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if (ss->getMode(GL_NORMALIZE) & osg::StateAttribute::ON // that is root stategraph of renderingmanager cpp
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|| ss->getAttribute(osg::StateAttribute::VIEWPORT)) // fallback to rendertargets sg just in case
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break;
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if (!root->_parent)
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return;
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}
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StateGraph* noTestRoot = root->find_or_insert(mNoTestStateSet.get());
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// root is now a stategraph with useDiffuseMapForShadowAlpha disabled but minimal other state
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noTestRoot->_leaves.reserve(_stateGraphList.size());
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StateGraphList newList;
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std::unordered_set<StateGraph*> uninterestingCache;
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for (StateGraph* graph : _stateGraphList)
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{
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// Render leaves which shouldn't use the diffuse map for shadow alpha but do cast shadows become children of root, so graph is now empty. Don't add to newList.
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// Graphs containing just render leaves which don't cast shadows are discarded. Don't add to newList.
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// Graphs containing other leaves need to be in newList.
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StateGraph* graphToAdd = cullStateGraph(graph, noTestRoot, uninterestingCache);
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if (graphToAdd)
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newList.push_back(graphToAdd);
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}
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if (!noTestRoot->_leaves.empty())
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newList.push_back(noTestRoot);
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_stateGraphList = newList;
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}
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}
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@ -0,0 +1,76 @@
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#ifndef OPENMW_COMPONENTS_SCENEUTIL_SHADOWBIN_H
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#define OPENMW_COMPONENTS_SCENEUTIL_SHADOWBIN_H
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#include <unordered_set>
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#include <osgUtil/RenderBin>
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namespace osg
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{
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class Material;
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}
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namespace SceneUtil
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{
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/// renderbin which culls redundant state for shadow map rendering
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class ShadowsBin : public osgUtil::RenderBin
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{
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private:
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osg::ref_ptr<osg::StateSet> mNoTestStateSet;
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osg::ref_ptr<osg::StateSet> mShaderAlphaTestStateSet;
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public:
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META_Object(SceneUtil, ShadowsBin)
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ShadowsBin();
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ShadowsBin(const ShadowsBin& rhs, const osg::CopyOp& copyop)
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: osgUtil::RenderBin(rhs, copyop)
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, mNoTestStateSet(rhs.mNoTestStateSet)
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, mShaderAlphaTestStateSet(rhs.mShaderAlphaTestStateSet)
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{}
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void sortImplementation() override;
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struct State
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{
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State()
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: mAlphaBlend(false)
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, mAlphaBlendOverride(false)
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, mAlphaTest(false)
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, mAlphaTestOverride(false)
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, mMaterial(nullptr)
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, mMaterialOverride(false)
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, mImportantState(false)
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{}
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bool mAlphaBlend;
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bool mAlphaBlendOverride;
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bool mAlphaTest;
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bool mAlphaTestOverride;
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osg::Material* mMaterial;
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bool mMaterialOverride;
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bool mImportantState;
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bool needTexture() const { return mAlphaBlend || mAlphaTest; }
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bool needShadows() const;
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// A state is interesting if there's anything about it that might affect whether we can optimise child state
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bool interesting() const
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{
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return !needShadows() || needTexture() || mAlphaBlendOverride || mAlphaTestOverride || mMaterialOverride || mImportantState;
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}
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};
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osgUtil::StateGraph* cullStateGraph(osgUtil::StateGraph* sg, osgUtil::StateGraph* root, std::unordered_set<osgUtil::StateGraph*>& uninteresting);
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static void addPrototype(const std::string& name)
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{
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osg::ref_ptr<osgUtil::RenderBin> bin (new ShadowsBin);
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osgUtil::RenderBin::addRenderBinPrototype(name, bin);
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}
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};
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class ShadowsBinAdder
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{
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public:
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ShadowsBinAdder(const std::string& name){ ShadowsBin::addPrototype(name); }
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};
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}
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#endif
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