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deOccludeRaster.hpp

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///////////////////////////////////////////////////////////////////////////////
/// @file deOccludeRaster.hpp
///
/// @brief software rasterizer for doing occlusion culling with
///
/// @author Assassin
///
/// This file is the intellectual property of Novus Delta, LLC.. Usage of the
/// contents of this file is subject to the Destiny3D Member License which
/// can be found at http://www.destiny3d.com.  Any other usage is prohibited.
///
/// This file is distributed "AS IS" without warranty of any kind.  Novus
/// Delta, LLC. does not guarantee the fitness of the contents of this file
/// for any particular purpose.
///
/// Copyright (C) 2001-2003 Novus Delta, LLC. All Rights Reserved.
///
/// <hr>
///                                 Change History
/// </hr>
///
/// @date May 2003
/// @author Assassin
/// @remarks Initial Creation
///
///////////////////////////////////////////////////////////////////////////////

#ifndef DEOCCLUDERASTER_HPP
#define DEOCCLUDERASTER_HPP

#include "deGlobalTypes.hpp"
#include "deMath.hpp"

#define OCCLUDE_16BIT       (1) // faster when enabled
#define OCCLUDE_MINBUFFER   (0) // faster when disabled

class deOccludeRasterizer
{
public:
#if OCCLUDE_16BIT
    typedef u16 BufferType;
#else
    typedef u32 BufferType;
#endif

    deOccludeRasterizer();
    ~deOccludeRasterizer();

    void SetBufferSize(short Width, short Height);
    void SetViewport(const deRect& ViewRect);
    void SetScissorRect(const deRect& ScissorRect);
    void SetGradientCutoff(deFloat Cutoff);
    void SetPixelCounting(deBoolean CountPixels);
    void SetWorldTransform(const deTransformInfo & World);
    void SetViewTransform(const deTransformInfo & View);
    void SetFOVClipping(float FOVY, float Aspect, float ClipNear, float ClipFar, deFloatRect* FSubRect = NULL);
    void SetOrthoClipping(float Width, float Height, float ClipNear, float ClipFar, deBoolean Invert, deFloatRect* FSubRect = NULL);

    void ClearBuffer();
    int RenderIndexedTriangles(deBoolean TestOnly, const deVertex * Vertices, long NumVertices, const WORD * Indices = NULL, long NumIndices = 0);

    const BufferType* GetBuffer(long level = -1, deBoolean MinNotMax = deFALSE) const;
    long GetBufferDepth() const;
    void GetBufferSize(short& Width, short& Height,long level = -1) const;
    void GetViewport(deRect & ViewRect) const;
    void GetScissorRect(deRect & ScissorRect) const;
    deFloat GetGradientCutoff() const;

private:
    void ConcatenateMatrices();
    void ResizeBuffer();
    void BuildHierarchy(deBoolean ForceTearDown = deFALSE);
    deBoolean TestScreenExtentsVisible(const deFloatRect& FullExtents, DWORD MinZ, int MaxLevel);

    struct BufferLevel_t
    {
        short Width, Height;
        BufferType* MaxBuffer;
#if OCCLUDE_MINBUFFER
        BufferType* MinBuffer;
#endif
    };

    deTransform m_WorldTransform;
    deTransform m_ViewPosTransform;
    deTransform m_ViewportTransform;
    deMatrix44 m_ProjectionTransform;
    //deTransform m_ConcatenatedTransform;
    deMatrix44 m_ConcatenatedTransform;
    deFloat m_LastProjectionColumn[4];
    deFloat m_NearClip, m_FarClip;
    deRect m_Viewport;
    deRect m_ScissorRect;
    deFloat m_GradientCutoff;
    BufferType* m_Buffer;
    BufferLevel_t* m_Hierarchy;
    short m_Width, m_Height;
    short m_HierarchyDepth;
    deBoolean m_TransformsChanged;
    deBoolean m_BufferSizeChanged;
    deBoolean m_DirtyBuffer;
    deBoolean m_CountPixels;
};

#endif // DEOCCLUDERASTER_HPP

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