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#include "multiview.hpp"
#include <osg/DisplaySettings>
#include <osg/Texture2D>
#include <osg/Texture2DArray>
#include <osg/Texture2DMultisample>
#include <osg/io_utils>
#include <osgUtil/CullVisitor>
#include <osgUtil/RenderStage>
#include <osgViewer/Renderer>
#include <osgViewer/Viewer>
#include <map>
#include <string>
#include <components/sceneutil/color.hpp>
#include <components/sceneutil/mwshadowtechnique.hpp>
#include <components/settings/settings.hpp>
#include "frustum.hpp"
namespace Stereo
{
struct MultiviewFrustumCallback final : public Stereo::InitialFrustumCallback
{
MultiviewFrustumCallback(StereoFrustumManager* sfm, osg::Camera* camera)
: Stereo::InitialFrustumCallback(camera)
, mSfm(sfm)
{
}
void setInitialFrustum(
osg::CullStack& cullStack, osg::BoundingBoxd& bb, bool& nearCulling, bool& farCulling) const override
{
auto cm = cullStack.getCullingMode();
nearCulling = !!(cm & osg::CullSettings::NEAR_PLANE_CULLING);
farCulling = !!(cm & osg::CullSettings::FAR_PLANE_CULLING);
bb = mSfm->boundingBox();
}
StereoFrustumManager* mSfm;
};
struct ShadowFrustumCallback final : public SceneUtil::MWShadowTechnique::CustomFrustumCallback
{
ShadowFrustumCallback(StereoFrustumManager* parent)
: mParent(parent)
{
}
void operator()(osgUtil::CullVisitor& cv, osg::BoundingBoxd& customClipSpace,
osgUtil::CullVisitor*& sharedFrustumHint) override
{
mParent->customFrustumCallback(cv, customClipSpace, sharedFrustumHint);
}
StereoFrustumManager* mParent;
};
void joinBoundingBoxes(
const osg::Matrix& masterProjection, const osg::Matrix& slaveProjection, osg::BoundingBoxd& bb)
{
static const std::array<osg::Vec3d, 8> clipCorners = { {
{ -1.0, -1.0, -1.0 },
{ 1.0, -1.0, -1.0 },
{ 1.0, -1.0, 1.0 },
{ -1.0, -1.0, 1.0 },
{ -1.0, 1.0, -1.0 },
{ 1.0, 1.0, -1.0 },
{ 1.0, 1.0, 1.0 },
{ -1.0, 1.0, 1.0 },
} };
osg::Matrix slaveClipToView;
slaveClipToView.invert(slaveProjection);
for (const auto& clipCorner : clipCorners)
{
auto masterViewVertice = clipCorner * slaveClipToView;
auto masterClipVertice = masterViewVertice * masterProjection;
bb.expandBy(masterClipVertice);
}
}
StereoFrustumManager::StereoFrustumManager(bool sharedShadowMaps, osg::Camera* camera)
: mCamera(camera)
, mShadowTechnique(nullptr)
, mShadowFrustumCallback(nullptr)
{
if (Stereo::getMultiview())
{
mMultiviewFrustumCallback = std::make_unique<MultiviewFrustumCallback>(this, camera);
}
if (sharedShadowMaps)
{
mShadowFrustumCallback = new ShadowFrustumCallback(this);
auto* renderer = static_cast<osgViewer::Renderer*>(mCamera->getRenderer());
for (auto* sceneView : { renderer->getSceneView(0), renderer->getSceneView(1) })
{
mSharedFrustums[sceneView->getCullVisitorRight()] = sceneView->getCullVisitorLeft();
}
}
}
StereoFrustumManager::~StereoFrustumManager()
{
if (mShadowTechnique)
mShadowTechnique->setCustomFrustumCallback(nullptr);
}
void StereoFrustumManager::setShadowTechnique(SceneUtil::MWShadowTechnique* shadowTechnique)
{
if (mShadowTechnique)
mShadowTechnique->setCustomFrustumCallback(nullptr);
mShadowTechnique = shadowTechnique;
if (mShadowTechnique)
mShadowTechnique->setCustomFrustumCallback(mShadowFrustumCallback);
}
void StereoFrustumManager::customFrustumCallback(
osgUtil::CullVisitor& cv, osg::BoundingBoxd& customClipSpace, osgUtil::CullVisitor*& sharedFrustumHint)
{
auto it = mSharedFrustums.find(&cv);
if (it != mSharedFrustums.end())
{
sharedFrustumHint = it->second;
}
customClipSpace = mBoundingBox;
}
void StereoFrustumManager::update(std::array<osg::Matrix, 2> projections)
{
mBoundingBox.init();
for (auto& projection : projections)
joinBoundingBoxes(mCamera->getProjectionMatrix(), projection, mBoundingBox);
}
}
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