153 lines
4.3 KiB
C++
153 lines
4.3 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_GRAPHICSTHREAD
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#define OSG_GRAPHICSTHREAD 1
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#include <osg/State>
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#include <OpenThreads/Thread>
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#include <OpenThreads/Barrier>
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#include <OpenThreads/Condition>
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#include <list>
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namespace osg {
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// forward declare GraphicsContext
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class GraphicsContext;
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class Block: public osg::Referenced {
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public:
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Block():_released(false) {}
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inline void block()
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> mutlock(_mut);
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if( !_released )
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_cond.wait(&_mut);
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}
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inline void release()
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> mutlock(_mut);
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if (!_released)
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{
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_released = true;
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_cond.broadcast();
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}
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}
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inline void reset()
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{
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OpenThreads::ScopedLock<OpenThreads::Mutex> mutlock(_mut);
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_released = false;
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}
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inline void set(bool doRelease)
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{
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if (doRelease!=_released)
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{
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if (doRelease) release();
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else reset();
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}
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}
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protected:
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~Block()
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{
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release();
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}
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private:
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OpenThreads::Mutex _mut;
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OpenThreads::Condition _cond;
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bool _released;
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};
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/** GraphicsThread is a helper class for running OpenGL GraphicsOperation within a single thread assigned to a specific GraphicsContext.*/
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class GraphicsThread : public Referenced, public OpenThreads::Thread
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{
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public:
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GraphicsThread();
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/** Base class for implementing GraphicsThread operations.*/
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struct OSG_EXPORT Operation : public Referenced
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{
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virtual void operator () (GraphicsContext*) {}
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};
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/** Add operation to end of OperationQueue, this will be
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* executed by the graphics thread once this operation gets to the head of the queue.*/
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void add(Operation* operation, bool waitForCompletion=false);
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/** Run does the graphics thread run loop.*/
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virtual void run();
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/** Cancel this graphics thread.*/
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virtual int cancel();
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protected:
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virtual ~GraphicsThread();
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friend class GraphicsContext;
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GraphicsContext* _graphicsContext;
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typedef std::list< ref_ptr<Operation> > OperationQueue;
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bool _done;
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OpenThreads::Mutex _operationsMutex;
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osg::ref_ptr<osg::Block> _operationsBlock;
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OperationQueue _operations;
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};
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/** SwapBufferOperation calls swap buffers on the GraphicsContext.*/
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struct OSG_EXPORT SwapBuffersOperation : public GraphicsThread::Operation
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{
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virtual void operator () (GraphicsContext* context);
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};
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/** BarrierOperation allows one syncronize multiple GraphicsThreads with each other.*/
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struct OSG_EXPORT BarrierOperation : public GraphicsThread::Operation, public OpenThreads::Barrier
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{
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enum PreBlockOp
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{
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NO_OPERATION,
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GL_FLUSH,
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GL_FINISH
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};
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BarrierOperation(int numThreads, PreBlockOp op=NO_OPERATION): OpenThreads::Barrier(numThreads), _preBlockOp(op) {}
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virtual void operator () (GraphicsContext* context);
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PreBlockOp _preBlockOp;
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};
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/** ReleaseContext_Block_MakeCurrentOperation releases the context for another thread to aquire,
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* then blocks waiting for context to be released, once the block is release the context is re-aqquired.*/
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struct OSG_EXPORT ReleaseContext_Block_MakeCurrentOperation : public GraphicsThread::Operation, public Block
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{
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ReleaseContext_Block_MakeCurrentOperation() {}
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virtual void operator () (GraphicsContext* context);
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};
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}
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#endif
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