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#include "glextensions.hpp"
#include <osg/GraphicsContext>
namespace SceneUtil
{
namespace
{
std::set<osg::observer_ptr<osg::GLExtensions>> sGLExtensions;
class GLExtensionsObserver : public osg::Observer
{
public:
static GLExtensionsObserver sInstance;
~GLExtensionsObserver() override
{
for (auto& ptr : sGLExtensions)
{
osg::ref_ptr<osg::GLExtensions> ref;
if (ptr.lock(ref))
ref->removeObserver(this);
}
}
void objectDeleted(void* referenced) override
{
sGLExtensions.erase(static_cast<osg::GLExtensions*>(referenced));
}
};
// construct after sGLExtensions so this gets destroyed first.
GLExtensionsObserver GLExtensionsObserver::sInstance{};
}
bool glExtensionsReady()
{
return !sGLExtensions.empty();
}
osg::GLExtensions& getGLExtensions()
{
if (sGLExtensions.empty())
throw std::runtime_error(
"GetGLExtensionsOperation was not used when the current context was created or there is no current "
"context");
return **sGLExtensions.begin();
}
GetGLExtensionsOperation::GetGLExtensionsOperation()
: GraphicsOperation("GetGLExtensionsOperation", false)
{
}
void GetGLExtensionsOperation::operator()(osg::GraphicsContext* graphicsContext)
{
auto [itr, _] = sGLExtensions.emplace(graphicsContext->getState()->get<osg::GLExtensions>());
(*itr)->addObserver(&GLExtensionsObserver::sInstance);
}
}
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