OgreRenderTarget.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2012 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __RenderTarget_H__
#define __RenderTarget_H__

#include "OgrePrerequisites.h"

#include "OgreString.h"
#include "OgreTextureManager.h"
#include "OgreViewport.h"
#include "OgreTimer.h"

/* Define the number of priority groups for the render system's render targets. */
#ifndef OGRE_NUM_RENDERTARGET_GROUPS
    #define OGRE_NUM_RENDERTARGET_GROUPS 10
    #define OGRE_DEFAULT_RT_GROUP 4
    #define OGRE_REND_TO_TEX_RT_GROUP 2
#endif

namespace Ogre {

    class _OgreExport RenderTarget : public RenderSysAlloc
    {
    public:
        enum StatFlags
        {
            SF_NONE           = 0,
            SF_FPS            = 1,
            SF_AVG_FPS        = 2,
            SF_BEST_FPS       = 4,
            SF_WORST_FPS      = 8,
            SF_TRIANGLE_COUNT = 16,
            SF_ALL            = 0xFFFF
        };

        struct FrameStats
        {
            float lastFPS;
            float avgFPS;
            float bestFPS;
            float worstFPS;
            unsigned long bestFrameTime;
            unsigned long worstFrameTime;
            size_t triangleCount;
            size_t batchCount;
        };

        enum FrameBuffer
        {
            FB_FRONT,
            FB_BACK,
            FB_AUTO
        };

        RenderTarget();
        virtual ~RenderTarget();

        virtual const String& getName(void) const;

        virtual void getMetrics(unsigned int& width, unsigned int& height, unsigned int& colourDepth);

        virtual unsigned int getWidth(void) const;
        virtual unsigned int getHeight(void) const;
        virtual unsigned int getColourDepth(void) const;

        void setDepthBufferPool( uint16 poolId );

        //Returns the pool ID this RenderTarget should query from. @see DepthBuffer
        uint16 getDepthBufferPool() const;

        DepthBuffer* getDepthBuffer() const;

        //Returns false if couldn't attach
        virtual bool attachDepthBuffer( DepthBuffer *depthBuffer );

        virtual void detachDepthBuffer();

        virtual void _detachDepthBuffer();

        virtual void update(bool swapBuffers = true);
        virtual void swapBuffers(bool waitForVSync = true)
        { (void)waitForVSync; }

        virtual Viewport* addViewport(Camera* cam, int ZOrder = 0, float left = 0.0f, float top = 0.0f ,
            float width = 1.0f, float height = 1.0f);

        virtual unsigned short getNumViewports(void) const;

        virtual Viewport* getViewport(unsigned short index);

        virtual Viewport* getViewportByZOrder(int ZOrder);

        virtual bool hasViewportWithZOrder(int ZOrder);

        virtual void removeViewport(int ZOrder);

        virtual void removeAllViewports(void);

        virtual void getStatistics(float& lastFPS, float& avgFPS,
            float& bestFPS, float& worstFPS) const;  // Access to stats

        virtual const FrameStats& getStatistics(void) const;

        virtual float getLastFPS() const;

        virtual float getAverageFPS() const;

        virtual float getBestFPS() const;

        virtual float getWorstFPS() const;

        virtual float getBestFrameTime() const;

        virtual float getWorstFrameTime() const;

        virtual void resetStatistics(void);

        virtual void getCustomAttribute(const String& name, void* pData);

        virtual void addListener(RenderTargetListener* listener);
        virtual void removeListener(RenderTargetListener* listener);
        virtual void removeAllListeners(void);

        virtual void setPriority( uchar priority ) { mPriority = priority; }
        virtual uchar getPriority() const { return mPriority; }

        virtual bool isActive() const;

        virtual void setActive( bool state );

        virtual void setAutoUpdated(bool autoupdate);
        virtual bool isAutoUpdated(void) const;

        virtual void copyContentsToMemory(const PixelBox &dst, FrameBuffer buffer = FB_AUTO) = 0;

        virtual PixelFormat suggestPixelFormat() const { return PF_BYTE_RGBA; }
        
        void writeContentsToFile(const String& filename);

        virtual String writeContentsToTimestampedFile(const String& filenamePrefix, const String& filenameSuffix);

        virtual bool requiresTextureFlipping() const = 0;

        virtual size_t getTriangleCount(void) const;
        virtual size_t getBatchCount(void) const;
        virtual void _notifyCameraRemoved(const Camera* cam);

        virtual bool isPrimary(void) const;

        virtual bool isHardwareGammaEnabled() const { return mHwGamma; }

        virtual uint getFSAA() const { return mFSAA; }

        virtual const String& getFSAAHint() const { return mFSAAHint; }

        class Impl
        {
        protected:
            ~Impl() { }
        };
        virtual Impl *_getImpl();

        virtual void _beginUpdate();

        virtual void _updateViewport(int zorder, bool updateStatistics = true);

        virtual void _updateViewport(Viewport* viewport, bool updateStatistics = true);

        virtual void _updateAutoUpdatedViewports(bool updateStatistics = true);
        
        virtual void _endUpdate();

    protected:
        String mName;
        uchar mPriority;

        unsigned int mWidth;
        unsigned int mHeight;
        unsigned int mColourDepth;
        uint16       mDepthBufferPoolId;
        DepthBuffer *mDepthBuffer;

        // Stats
        FrameStats mStats;
        
        Timer* mTimer ;
        unsigned long mLastSecond;
        unsigned long mLastTime;
        size_t mFrameCount;

        bool mActive;
        bool mAutoUpdate;
        // Hardware sRGB gamma conversion done on write?
        bool mHwGamma;
        // FSAA performed?
        uint mFSAA;
        String mFSAAHint;

        void updateStats(void);

        typedef map<int, Viewport*>::type ViewportList;
        ViewportList mViewportList;

        typedef vector<RenderTargetListener*>::type RenderTargetListenerList;
        RenderTargetListenerList mListeners;
    

        virtual void firePreUpdate(void);
        virtual void firePostUpdate(void);
        virtual void fireViewportPreUpdate(Viewport* vp);
        virtual void fireViewportPostUpdate(Viewport* vp);
        virtual void fireViewportAdded(Viewport* vp);
        virtual void fireViewportRemoved(Viewport* vp);
        
        virtual void updateImpl();
    };
} // Namespace

#endif