source: code/branches/buildsystem2/src/ogreceguirenderer/OgreCEGUIRenderer.h @ 2580

/************************************************************************
    filename:   OgreCEGUIRenderer.h
    created:    11/5/2004
    author:             Paul D Turner

    purpose:    Interface for main Ogre GUI renderer class
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
/*************************************************************************
    This file contains code that is specific to Ogre (http://www.ogre3d.org)
*************************************************************************/
#ifndef _OgreCEGUIRenderer_h_
#define _OgreCEGUIRenderer_h_

#include <CEGUIBase.h>
#include <CEGUIRenderer.h>
#include <CEGUITexture.h>

#include <OgreRenderQueueListener.h>
#include <OgreSceneManagerEnumerator.h>
#include <OgreTextureUnitState.h>

#if (OGRE_PLATFORM == OGRE_PLATFORM_WIN32) && !defined(OGRE_STATIC_LIB)
#   ifdef OGRE_GUIRENDERER_EXPORTS
#       define OGRE_GUIRENDERER_API __declspec(dllexport)
#   else
#       if defined(__MINGW32__)
#           define OGRE_GUIRENDERER_API
#       else
#           define OGRE_GUIRENDERER_API __declspec(dllimport)
#       endif
#   endif
#elif defined ( OGRE_GCC_VISIBILITY )
#    define OGRE_GUIRENDERER_API  __attribute__ ((visibility("default")))
#else
#    define OGRE_GUIRENDERER_API
#endif


// Start of CEGUI namespace section
namespace CEGUI
{
/*************************************************************************
    Forward refs
*************************************************************************/
class OgreCEGUITexture;
class OgreCEGUIRenderer;


/*!
\brief
    RenderQueueListener based class used to hook into the ogre rendering system
*/
class _OgrePrivate CEGUIRQListener : public Ogre::RenderQueueListener
{
public:
    CEGUIRQListener(OgreCEGUIRenderer* renderer, Ogre::uint8 queue_id, bool post_queue)
    {
        d_renderer              = renderer;
        d_queue_id              = queue_id;
        d_post_queue    = post_queue;
    }

    virtual ~CEGUIRQListener() {}

    virtual void        renderQueueStarted(Ogre::uint8 id, const Ogre::String& invocation, bool& skipThisQueue);
    virtual void        renderQueueEnded(Ogre::uint8 id, const Ogre::String& invocation, bool& repeatThisQueue);

    // methods for adjusting target queue settings
    void        setTargetRenderQueue(Ogre::uint8 queue_id)              {d_queue_id = queue_id;}
    void        setPostRenderQueue(bool post_queue)             {d_post_queue = post_queue;}

private:
    /*************************************************************************
        Implementation Data
    *************************************************************************/
    OgreCEGUIRenderer*                          d_renderer;             //!< CEGUI renderer object for Ogre.
    Ogre::uint8 d_queue_id;             //!< ID of the queue that we are hooked into
    bool                                                d_post_queue;   //!< true if we render after everything else in our queue.
};


/*!
\brief
    Renderer class to interface with Ogre engine.
*/
class OGRE_GUIRENDERER_API OgreCEGUIRenderer : public Renderer
{
public:
    /*!
    \brief
        Constructor for renderer class that uses Ogre for rendering. Note that if
        you use this option you must call setTargetSceneManager before rendering.

    \param window
        Pointer to an Ogre::RenderWindow object.

    \param queue_id
        Ogre::uint8 value that specifies where the GUI should appear in the ogre rendering output.

    \param post_queue
        set to true to have GUI rendered after render queue \a queue_id, or false to have the GUI rendered before render queue
        \a queue_id.

    \param max_quads
        Obsolete.  Set to 0.

    */
    OgreCEGUIRenderer(Ogre::RenderWindow* window,
        Ogre::uint8 queue_id = Ogre::RENDER_QUEUE_OVERLAY,
        bool post_queue = false, uint max_quads = 0);


    /*!
    \brief
        Constructor for renderer class that uses Ogre for rendering.

    \param window
        Pointer to an Ogre::RenderWindow object.

    \param queue_id
        Ogre::uint8 value that specifies where the GUI should appear in the ogre rendering output.

    \param post_queue
        set to true to have GUI rendered after render queue \a queue_id, or false to have the GUI rendered before render queue
        \a queue_id.

    \param max_quads
        Obsolete.  Set to 0.

    \param scene_manager
        Pointer to an Ogre::SceneManager object that is to be used for GUI rendering.
    */
    OgreCEGUIRenderer(Ogre::RenderWindow* window, Ogre::uint8 queue_id, bool post_queue, uint max_quads, Ogre::SceneManager* scene_manager);


    /*!
    \brief
        Destructor for Ogre renderer.
    */
    virtual ~OgreCEGUIRenderer(void);



    // add's a quad to the list to be rendered
    virtual     void    addQuad(const Rect& dest_rect, float z, const Texture* tex, const Rect& texture_rect, const ColourRect& colours, QuadSplitMode quad_split_mode);

    // perform final rendering for all queued renderable quads.
    virtual     void    doRender(void);

    // clear the queue
    virtual     void    clearRenderList(void);


    /*!
    \brief
        Enable or disable the queueing of quads from this point on.

        This only affects queueing.  If queueing is turned off, any calls to addQuad will cause the quad to be rendered directly.  Note that
        disabling queueing will not cause currently queued quads to be rendered, nor is the queue cleared - at any time the queue can still
        be drawn by calling doRender, and the list can be cleared by calling clearRenderList.  Re-enabling the queue causes subsequent quads
        to be added as if queueing had never been disabled.

    \param setting
        true to enable queueing, or false to disable queueing (see notes above).

    \return
        Nothing
    */
    virtual void        setQueueingEnabled(bool setting)                {d_queueing = setting;}


    // create an empty texture
    virtual     Texture*        createTexture(void);

    // create a texture and load it with the specified file.
    virtual     Texture*        createTexture(const String& filename, const String& resourceGroup = "General");

    // create a texture and set it to the specified size
    virtual     Texture*        createTexture(float size);

    // create an OGRE resource provider.
    virtual ResourceProvider* createResourceProvider(void);

    // destroy the given texture
    virtual     void            destroyTexture(Texture* texture);

    // destroy all textures still active
    virtual void                destroyAllTextures(void);


    /*!
    \brief
        Return whether queueing is enabled.

    \return
        true if queueing is enabled, false if queueing is disabled.
    */
    virtual bool        isQueueingEnabled(void) const   {return d_queueing;}


    /*!
    \brief
    Return the current width of the display in pixels

    \return
    float value equal to the current width of the display in pixels.
    */
    virtual float       getWidth(void) const            {return d_display_area.getWidth();}


    /*!
    \brief
    Return the current height of the display in pixels

    \return
    float value equal to the current height of the display in pixels.
    */
    virtual float       getHeight(void) const           {return d_display_area.getHeight();}


    /*!
    \brief
    Return the size of the display in pixels

    \return
    Size object describing the dimensions of the current display.
    */
    virtual Size        getSize(void) const                     {return d_display_area.getSize();}


    /*!
    \brief
    Return a Rect describing the screen

    \return
    A Rect object that describes the screen area.  Typically, the top-left values are always 0, and the size of the area described is
    equal to the screen resolution.
    */
    virtual Rect        getRect(void) const                     {return d_display_area;}


    /*!
    \brief
        Return the maximum texture size available

    \return
        Size of the maximum supported texture in pixels (textures are always assumed to be square)
    */
    virtual     uint    getMaxTextureSize(void) const           {return 2048;}          // TODO: Change to proper value


    /*!
    \brief
        Return the horizontal display resolution dpi

    \return
        horizontal resolution of the display in dpi.
    */
    virtual     uint    getHorzScreenDPI(void) const    {return 96;}


    /*!
    \brief
        Return the vertical display resolution dpi

    \return
        vertical resolution of the display in dpi.
    */
    virtual     uint    getVertScreenDPI(void) const    {return 96;}


    /*!
    \brief
        Set the scene manager to be used for rendering the GUI.

        The GUI system will be unhooked from the current scene manager and attached to what ever
        is specified here.

    \param scene_manager
        Pointer to an Ogre::SceneManager object that is the new target Ogre::SceneManager to be
        used for GUI rendering.

    \return
        Nothing.
    */
    void        setTargetSceneManager(Ogre::SceneManager* scene_manager);


    /*!
    \brief
        Set the target render queue for GUI rendering.

    \param queue_id
        Ogre::uint8 value specifying the render queue that the GUI system should attach to.

    \param post_queue
        - true to specify that the GUI should render after everything else in render queue \a queue_id.
        - false to specify the GUI should render before everything else in render queue \a queue_id.

    \return
        Nothing.
    */
    void        setTargetRenderQueue(Ogre::uint8 queue_id, bool post_queue);


    /*!
    \brief
        Create a texture from an existing Ogre::TexturePtr object.

    \note
        If you want to use an Ogre::RenderTexture (for putting rendered output onto Gui elements or other
        advanced techniques), you can get the Ogre::TexturePtr to be used by calling Ogre::TextureManager::getByName()
        passing the name returned from Ogre::RenderTexture::getName() (and casting the result as necessary).

    \param texture
        pointer to an Ogre::TexturePtr object to be used as the basis for the new CEGUI::Texture

    \return
        Pointer to the newly created CEGUI::TexturePtr object.
    */
    Texture*    createTexture(Ogre::TexturePtr& texture);


    /*!
    \brief
    Set the size of the display in pixels.

    You do not have to call this method under normal operation as the system
    will automatically extract the size from the current view port.

    \note
    This method will cause the EventDisplaySizeChanged event to fire if the
    display size has changed.

    \param sz
    Size object describing the size of the display.

    \return
    Nothing.
    */
    void        setDisplaySize(const Size& sz);


private:
    /************************************************************************
        Implementation Constants
    ************************************************************************/
    static const size_t    VERTEX_PER_QUAD;                                              //!< number of vertices per quad
    static const size_t    VERTEX_PER_TRIANGLE;                                  //!< number of vertices for a triangle
    static const size_t    VERTEXBUFFER_INITIAL_CAPACITY;                //!< initial capacity of the allocated vertex buffer
    static const size_t    UNDERUSED_FRAME_THRESHOLD;            //!< number of frames to wait before shrinking buffer

    /*************************************************************************
        Implementation Structs & classes
    *************************************************************************/
    /*!
    \brief
        structure used for all vertices.
    */
    struct QuadVertex {
        float x, y, z;                  //!< The position for the vertex.
        Ogre::RGBA diffuse;             //!< colour of the vertex
        float tu1, tv1;                 //!< texture coordinates
    };

    /*!
    \brief
        structure holding details about a quad to be drawn
    */
    struct QuadInfo
    {
        Ogre::TexturePtr                texture;
        Rect                            position;
        float                           z;
        Rect                            texPosition;
        uint32                  topLeftCol;
        uint32                  topRightCol;
        uint32                  bottomLeftCol;
        uint32                  bottomRightCol;

        QuadSplitMode           splitMode;

        bool operator<(const QuadInfo& other) const
        {
            // this is intentionally reversed.
            return z > other.z;
        }
    };


    /*************************************************************************
        Implementation Methods
    *************************************************************************/
    // setup states etc
    void        initRenderStates(void);

    // sort quads list according to texture
    void        sortQuads(void);

    // render a quad directly to the display
    void        renderQuadDirect(const Rect& dest_rect, float z, const Texture* tex, const Rect& texture_rect, const ColourRect& colours, QuadSplitMode quad_split_mode);

    // convert colour value to whatever the Ogre render system is expecting.
    uint32    colourToOgre(const colour& col) const;

    // perform main work of the constructor.  This does everything except the final hook into the render system.
    void        constructor_impl(Ogre::RenderWindow* window, Ogre::uint8 queue_id, bool post_queue, uint max_quads);


    /*************************************************************************
        Implementation Data
    *************************************************************************/
    Rect                                d_display_area;

    typedef std::multiset<QuadInfo>             QuadList;
    QuadList d_quadlist;
    bool         d_queueing;            //!< setting for queueing control.

    // Ogre specific bits.
    Ogre::Root*                                 d_ogre_root;            //!< pointer to the Ogre root object that we attach to
    Ogre::RenderSystem*                 d_render_sys;           //!< Pointer to the render system for Ogre.
    Ogre::uint8 d_queue_id;                     //!< ID of the queue that we are hooked into
    Ogre::TexturePtr                    d_currTexture;          //!< currently set texture;
    Ogre::RenderOperation               d_render_op;            //!< Ogre render operation we use to do our stuff.
    Ogre::HardwareVertexBufferSharedPtr d_buffer;       //!< vertex buffer to queue sprite rendering
    size_t d_underused_framecount;                  //!< Number of frames elapsed since buffer utilization was above half the capacity
    Ogre::RenderOperation               d_direct_render_op;             //!< Renderop for cursor
    Ogre::HardwareVertexBufferSharedPtr d_direct_buffer;        //!< Renderop for cursor
    Ogre::SceneManager*                 d_sceneMngr;            //!< The scene manager we are hooked into.
    Ogre::LayerBlendModeEx              d_colourBlendMode;      //!< Controls colour blending mode used.
    Ogre::LayerBlendModeEx              d_alphaBlendMode;       //!< Controls alpha blending mode used.
    Ogre::TextureUnitState::UVWAddressingMode d_uvwAddressMode;

    CEGUIRQListener*                    d_ourlistener;
    bool                                                d_post_queue;           //!< true if we render after everything else in our queue.
    size_t                                              d_bufferPos;            //!< index into buffer where next vertex should be put.
    bool                                                d_sorted;                       //!< true when data in quad list is sorted.
    Point                                               d_texelOffset;          //!< Offset required for proper texel mapping.

    std::list<OgreCEGUITexture*> d_texturelist;         //!< List used to track textures.
};

} // End of  CEGUI namespace section


#endif  // end of guard _OgreCEGUIRenderer_h_