Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifndef DISP_COMMON_H
#define DISP_COMMON_H
#ifdef _WIN32
#pragma once
#endif
#include "disp_vertindex.h"
#include "bspfile.h"
#include "utlvector.h"
class CPowerInfo;
class CCoreDispInfo;
// ----------------------------------------------------------------------------- //
// Classes.
// ----------------------------------------------------------------------------- //
// This class provides a set of utility functions for displacements that work in the tools and the engine.
abstract_class CDispUtilsHelper
{
// Derived classes must implement these.
public:
virtual const CPowerInfo* GetPowerInfo() const = 0;
virtual CDispNeighbor* GetEdgeNeighbor( int index ) = 0;
virtual CDispCornerNeighbors* GetCornerNeighbors( int index ) = 0;
virtual CDispUtilsHelper* GetDispUtilsByIndex( int index ) = 0;
// Helper functions.
public:
int GetPower() const;
int GetSideLength() const;
const CVertIndex& GetCornerPointIndex( int iCorner ) const;
int VertIndexToInt( const CVertIndex &i ) const;
CVertIndex GetEdgeMidPoint( int iEdge ) const;
};
// Use this to walk along two neighboring displacements and touch all the
// common vertices.
class CDispSubEdgeIterator
{
public:
CDispSubEdgeIterator();
// Normally, this will iterate all shared verts along the edge except the corners.
// If you want the corners to be touched too, then pass in bTouchCorners=true.
void Start( CDispUtilsHelper *pDisp, int iEdge, int iSub, bool bTouchCorners = false );
bool Next();
const CVertIndex& GetVertIndex() const { return m_Index; } // Get the vert index for the displacement in pUtils.
const CVertIndex& GetNBVertIndex() const { return m_NBIndex; } // Get the neighbor's vert index.
CDispUtilsHelper* GetNeighbor() const { return m_pNeighbor; }
// Returns true if you're on the last vert (ie: the next Next() call will return false).ssssss
bool IsLastVert() const;
private:
CDispUtilsHelper *m_pNeighbor; // The neighbor to the edge we were setup on.
CVertIndex m_Index;
CVertIndex m_Inc;
CVertIndex m_NBIndex;
CVertIndex m_NBInc;
int m_End;
int m_FreeDim;
};
// Use this to walk along the edge of a displacement, touching the points in common
// between the two neighbors. Note: this won't hit the corner points of any of the displacements.
// (As a result, it won't hit the midpoint of pDisps's edge if there are 2 neighbors).
class CDispEdgeIterator
{
public:
CDispEdgeIterator( CDispUtilsHelper *pDisp, int iEdge );
// Seek to the next point on the edge.
bool Next();
const CVertIndex& GetVertIndex() const { return m_It.GetVertIndex(); } // Get the vert index for the displacement in pUtils.
const CVertIndex& GetNBVertIndex() const { return m_It.GetNBVertIndex(); } // Get the neighbor's vert index.
// What is the current neighbor?
CDispUtilsHelper* GetCurrentNeighbor() const { return m_It.GetNeighbor(); }
private:
CDispUtilsHelper *m_pDisp;
int m_iEdge;
int m_iCurSub;
CDispSubEdgeIterator m_It;
};
// Use this to walk all the corners and edge verts in the displacement.
// It walks the edges in the order of the NEIGHBOREDGE_ defines.
// Iterate like this:
// CDispCircumferenceIterator iterator( pDisp->GetSideLength() );
// while ( iterator.Next() )
// ...
class CDispCircumferenceIterator
{
public:
CDispCircumferenceIterator( int sideLength );
// Seek to the next point. Returns false when there are no more points.
bool Next();
const CVertIndex& GetVertIndex() const { return m_VertIndex; }
private:
int m_SideLengthM1;
int m_iCurEdge;
CVertIndex m_VertIndex;
};
// These store info about how to scale and shift coordinates between neighbors
// of different relations (in g_ShiftInfos).
class CShiftInfo
{
public:
int m_MidPointScale;
int m_PowerShiftAdd;
bool m_bValid;
};
class CDispBox
{
public:
Vector m_Min, m_Max;
};
// ----------------------------------------------------------------------------- //
// Globals.
// ----------------------------------------------------------------------------- //
extern int g_EdgeDims[4]; // This tells which dimension (0 or 1) is locked on an edge for each NEIGHBOREDGE_ enum.
extern CShiftInfo g_ShiftInfos[3][3]; // See CShiftInfo.
extern int g_EdgeSideLenMul[4];// Multiply these by the side length to get the index of the edge.
// ----------------------------------------------------------------------------- //
// Helper functions.
// ----------------------------------------------------------------------------- //
// Reference implementation to generate triangle indices for a displacement.
int DispCommon_GetNumTriIndices( int power );
void DispCommon_GenerateTriIndices( int power, unsigned short *indices );
// Returns a NEIGHBOREDGE_ value for the edge that the index is on.
// Returns -1 if the index is not on a side.
// If the point is on a corner, the edges are tested in the order of the NEIGHBOREDGE_ defines.
int GetEdgeIndexFromPoint( CVertIndex const &index, int iPower );
// Returns a CORNER_ value for the corner the point is on, or -1 if it's not on a corner.
int GetEdgeIndexFromPoint( CVertIndex const &index, int iPower );
// This returns the neighbor's power, possibly +1 or -1.
//
// It will add one if the neighbor takes up half of your edge (ie: if it took up your
// whole edge, its resolution would be twice what it really is).
//
// It will subtract one if you take up half of its edge (ie: you only touch half of its verts).
//
// Returns -1 if the edge connection is invalid.
int GetNeighborEdgePower( CDispUtilsHelper *pDisp, int iEdge, int iSub );
// This function sets you up so you can walk along an edge that joins two neighbors.
// Add myInc to myIndex and nbInc to nbIndex until myIndex[iFreeDim] >= myEnd.
//
// Returns the neighbor displacement, or NULL if the specified sub neighbor isn't valid.
CDispUtilsHelper* SetupEdgeIncrements(
CDispUtilsHelper *pDisp,
int iEdge,
int iSub,
CVertIndex &myIndex,
CVertIndex &myInc,
CVertIndex &nbIndex,
CVertIndex &nbInc,
int &myEnd,
int &iFreeDim );
// Figure out which sub neighbor nodeIndex touches.
// Returns -1 if there is no valid sub neighbor at the specified index.
int GetSubNeighborIndex(
CDispUtilsHelper *pDisp,
int iEdge,
CVertIndex const &nodeIndex
);
// Given a vert index and the CSubNeighbor the vert lies on, this
// transforms the specified vert into the neighbor's space.
//
// Note: for corner verts, there may be multiple neighbors touching the same vert, so the
// result you get depends on the edge you specify in iEdge (ie: if you specify the same
// node index but a different edge, you may get a different neighbor).
//
// Note: This only returns a point if the point at nodeIndex actually touches a neighbor point.
// An example where this might be unexpected is if pDisp is power 4 and its neighbor on iEdge
// is power 3, and nodeIndex points at a vert in between two of its neighbor's verts.
// In that case, even though there is a neighbor displacement, nodeIndex doesn't touch
// any points on it, so NULL is returned.
CDispUtilsHelper* TransformIntoSubNeighbor(
CDispUtilsHelper *pDisp,
int iEdge,
int iSub,
CVertIndex const &nodeIndex,
CVertIndex &out
);
// Transform pDisp's node at nodeIndex into its neighboring connection.
// Returns the neighbor displacement and sets out to the index in the neighbor.
//
// Note: for corner verts, there may be multiple neighbors touching the same vert, so the
// result you get depends on the edge you specify in iEdge (ie: if you specify the same
// node index but a different edge, you may get a different neighbor).
//
// Note: This only returns a point if the point at nodeIndex actually touches a neighbor point.
// An example where this might surprise you is if pDisp is power 4 and its neighbor on iEdge
// is power 3, and nodeIndex points at a vert in between two of its neighbor's verts.
// In that case, even though there is a neighbor displacement, nodeIndex doesn't touch
// any points on it, so NULL is returned.
CDispUtilsHelper* TransformIntoNeighbor(
CDispUtilsHelper *pDisp,
int iEdge,
CVertIndex const &nodeIndex,
CVertIndex &out );
// Returns true if the specified point has one or more neighbors.
bool DoesPointHaveAnyNeighbors(
CDispUtilsHelper *pDisp,
const CVertIndex &index );
void FindNeighboringDispSurfs( CCoreDispInfo **ppListBase, int nListSize );
void SetupAllowedVerts( CCoreDispInfo **ppListBase, int nListSize );
void GetDispBox( CCoreDispInfo *pDisp, CDispBox &box );
// ----------------------------------------------------------------------------- //
// Inlines.
// ----------------------------------------------------------------------------- //
#include "disp_powerinfo.h"
#endif // DISP_COMMON_H