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462 lines
12 KiB
462 lines
12 KiB
#include "fow.h"
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#include "fow_radiusoccluder.h"
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#include "fow_viewer.h"
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#include "fow_2dplane.h"
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#include "engine/IVDebugOverlay.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include <tier0/memdbgon.h>
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extern IVDebugOverlay *debugoverlay;
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//-----------------------------------------------------------------------------
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// Purpose: constructor to init this occluder with the id
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// Input : nID - the id of this occluder
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//-----------------------------------------------------------------------------
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CFoW_RadiusOccluder::CFoW_RadiusOccluder( int nID )
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{
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m_nID = nID;
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m_flRadius = 0.0f;
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m_vLocation.Zero();
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m_nHeightGroup = 0;
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m_bEnabled = true;
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}
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//-----------------------------------------------------------------------------
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// Purpose: update the radius of this occluder
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// Input : flRadius - the new radius size
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::UpdateSize( float flRadius )
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{
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m_flRadius = flRadius;
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}
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//-----------------------------------------------------------------------------
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// Purpose: update the location of this occluder
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// Input : vLocation - the new location
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::UpdateLocation( Vector &vLocation )
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{
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m_vLocation = vLocation;
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}
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//-----------------------------------------------------------------------------
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// Purpose: update the height group of this occluder
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// Input : nHeightGroup - the new height group
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::UpdateHeightGroup( uint8 nHeightGroup )
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{
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m_nHeightGroup = nHeightGroup;
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}
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//-----------------------------------------------------------------------------
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// Purpose: is the occluder within range of the viewer?
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// Input : pViewer - the viewer to check against
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// Output : returns true if the two circles intersect
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//-----------------------------------------------------------------------------
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bool CFoW_RadiusOccluder::IsInRange( CFoW_Viewer *pViewer )
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{
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if ( m_bEnabled == false )
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{
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return false;
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}
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Vector vDiff = pViewer->GetLocation() - m_vLocation;
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float flLen = sqrt( ( vDiff.x * vDiff.x ) + ( vDiff.y * vDiff.y ) );
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return ( flLen <= m_flRadius + pViewer->GetSize() );
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}
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//-----------------------------------------------------------------------------
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// Purpose: obstruct the viewer by updating the local viewer grid
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// Input : pFoW - the main FoW object
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// pViewer - the viewer to obstruct
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::ObstructViewerGrid( CFoW *pFoW, CFoW_Viewer *pViewer )
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{
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if ( m_bEnabled == false )
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{
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return;
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}
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Vector vViewerLoc = pViewer->GetLocation();
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float flViewerRadius = pViewer->GetSize();
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Vector vDelta = ( vViewerLoc - m_vLocation );
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vDelta.z = 0.0f;
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float flLength = vDelta.Length();
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if ( flLength > ( flViewerRadius + m_flRadius ) )
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{
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return;
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}
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// if ( length <= m_flRadius || length > ViewerRadius )
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if ( flLength <= m_flRadius )
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{
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return;
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}
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float flAngle = ( float )atan2( vDelta.y, vDelta.x );
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float flTangentLen = sqrt( flLength * flLength - m_flRadius * m_flRadius );
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float flTangentAngle = ( float )asin( m_flRadius / flLength );
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// compute the two tangent angles
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float flPos = flAngle + flTangentAngle;
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float flNeg = flAngle - flTangentAngle;
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float x[ 6 ], y[ 6 ];
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// compute the two tangent points
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x[ 0 ] = -( float )cos( flPos ) * flTangentLen + vViewerLoc.x;
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y[ 0 ] = -( float )sin( flPos ) * flTangentLen + vViewerLoc.y;
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x[ 5 ] = -( float )cos( flNeg ) * flTangentLen + vViewerLoc.x;
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y[ 5 ] = -( float )sin( flNeg ) * flTangentLen + vViewerLoc.y;
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// extend the tangent points to the viewer's edge
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x[ 1 ] = -( float )cos( flPos ) * flViewerRadius + vViewerLoc.x;
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y[ 1 ] = -( float )sin( flPos ) * flViewerRadius + vViewerLoc.y;
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x[ 4 ] = -( float )cos( flNeg ) * flViewerRadius + vViewerLoc.x;
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y[ 4 ] = -( float )sin( flNeg ) * flViewerRadius + vViewerLoc.y;
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// compute the forward direction of the viewer's intersection through this blocker
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float fx = -vDelta.x / flLength;
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float fy = -vDelta.y / flLength;
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// compute half the length between the viewer's tangent edges
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float dx2 = x[ 4 ] - x[ 1 ];
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float dy2 = y[ 4 ] - y[ 1 ];
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float flHalflen = ( dx2 * dx2 + dy2 * dy2 ) / 4;
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// compute the side of the triangle that forms from viewer's radius to half way across the viewer's tangent edges
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float flLen2 = ( float )sqrt( flViewerRadius * flViewerRadius - flHalflen );
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flLen2 = flViewerRadius - flLen2;
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// compute the box extents to encompass the circle's bounds
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x[ 2 ] = x[ 1 ] + ( fx * flLen2 );
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y[ 2 ] = y[ 1 ] + ( fy * flLen2 );
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x[ 3 ] = x[ 4 ] + ( fx * flLen2 );
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y[ 3 ] = y[ 4 ] + ( fy * flLen2 );
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CFOW_2DPlane Planes[ 6 ];
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for (int i = 0; i < 6; i++)
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{
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Planes[ i ].Init( x[ i ], y[ i ], x[ ( i + 1 ) % 6 ], y[ ( i + 1 ) % 6 ] );
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}
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float flMinX = x[ 0 ], flMinY = y[ 0 ], flMaxX = x[ 0 ], flMaxY = y[ 0 ];
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for ( int i = 1; i < 6; i++ )
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{
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if ( x[ i ] < flMinX )
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{
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flMinX = x[ i ];
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}
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if ( x[ i ] > flMaxX )
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{
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flMaxX = x[ i ];
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}
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if ( y[ i ] < flMinY )
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{
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flMinY = y[ i ];
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}
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if ( y[i] > flMaxY )
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{
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flMaxY = y[ i ];
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}
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}
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float px, py, flStart_py, ex, ey;
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int nGridX, nGridY, nStartGridY;
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Vector2D vViewerStart, vViewerEnd;
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int nGridSize = pFoW->GetHorizontalGridSize();
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pViewer->GetStartPosition( vViewerStart );
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pViewer->GetEndPosition( vViewerEnd );
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if ( flMinX > vViewerStart.x )
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{
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nGridX = ( int )( flMinX - vViewerStart.x ) / nGridSize;
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px = vViewerStart.x + ( int )( nGridSize * nGridX );
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}
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else
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{
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px = vViewerStart.x;
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nGridX = 0;
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}
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if ( flMaxX < vViewerEnd.x )
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{
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ex = flMaxX;
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}
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else
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{
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ex = vViewerEnd.x;
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}
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if ( flMinY > vViewerStart.y )
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{
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nStartGridY = ( int )( flMinY - vViewerStart.y ) / nGridSize;
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flStart_py = vViewerStart.y + ( int )( nGridSize * nStartGridY );
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}
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else
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{
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nStartGridY = 0;
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flStart_py = vViewerStart.y;
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}
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if ( flMaxY < vViewerEnd.y )
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{
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ey = flMaxY;
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}
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else
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{
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ey = vViewerEnd.y;
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}
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byte *pLocalVisibility = pViewer->GetVisibility();
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int nLocalGridUnits = pViewer->GetGridUnits();
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// offset to center of grid
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px += nGridSize / 2;
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flStart_py += nGridSize / 2;
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for ( ; px < ex; px += nGridSize, nGridX++)
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{
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for ( nGridY = nStartGridY, py = flStart_py; py < ey; py += nGridSize, nGridY++ )
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{
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byte *pPos = pLocalVisibility + ( nGridX * nLocalGridUnits ) + nGridY;
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if ( ( ( *pPos ) & FOW_VG_IS_VISIBLE ) == 0 )
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{
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continue;
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}
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int i;
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for ( i = 0; i < 6; i++ )
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{
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#if 0
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// we don't need to check the bounding planes - these would be used to construct a stencil buffer though
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if ( i == 1 || i == 2 || i == 3 )
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{
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continue;
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}
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#endif
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if ( !Planes[ i ].PointInFront( px, py ) )
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{
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break;
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}
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}
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if ( i == 6 )
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{
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( *pPos ) &= ~FOW_VG_IS_VISIBLE;
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}
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}
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}
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}
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// #define SLOW_PATH 1
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//-----------------------------------------------------------------------------
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// Purpose: obstruct the viewer by updating the depth circle
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// Input : pFoW - the main FoW object
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// pViewer - the viewer to obstruct
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::ObstructViewerRadius( CFoW *pFoW, CFoW_Viewer *pViewer )
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{
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if ( m_bEnabled == false )
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{
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return;
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}
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if ( m_flRadius <= 1.0f )
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{
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Warning( "FoW: Occluder %d has invalid radius\n", m_nID );
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return;
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}
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int nViewerHeightGroup = pViewer->GetHeightGroup();
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if ( nViewerHeightGroup >= 1 && m_nHeightGroup >= 1 && m_nHeightGroup < nViewerHeightGroup )
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{ // both the viewer and the occluder have height groups and this occluder is under the viewer, then don't obstruct
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return;
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}
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Vector vViewerLoc = pViewer->GetLocation();
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float flViewerRadius = pViewer->GetSize();
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Vector vDelta = ( vViewerLoc - m_vLocation );
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vDelta.z = 0.0f;
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float flLength = vDelta.Length();
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if ( flLength > ( flViewerRadius + m_flRadius ) )
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{
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return;
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}
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// if ( length <= m_flRadius || length > ViewerRadius )
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if ( flLength <= m_flRadius )
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{
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return;
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}
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float flAngle = ( float )atan2( vDelta.x, vDelta.y ) + DEG2RAD( 180.0f );
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float flTangentLen = sqrt( flLength * flLength - m_flRadius * m_flRadius );
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float flTangentAngle = ( float )asin( m_flRadius / flLength );
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// compute the two tangent angles
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float flPos = flAngle + flTangentAngle;
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float flNeg = flAngle - flTangentAngle;
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float x[ 6 ], y[ 6 ];
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// compute the two tangent points
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#ifdef SLOW_PATH
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x[ 0 ] = ( float )sin( flPos ) * flTangentLen + vViewerLoc.x;
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y[ 0 ] = ( float )cos( flPos ) * flTangentLen + vViewerLoc.y;
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x[ 5 ] = ( float )sin( flNeg ) * flTangentLen + vViewerLoc.x;
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y[ 5 ] = ( float )cos( flNeg ) * flTangentLen + vViewerLoc.y;
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#else
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x[ 0 ] = ( float )TableSin( flPos ) * flTangentLen + vViewerLoc.x;
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y[ 0 ] = ( float )TableCos( flPos ) * flTangentLen + vViewerLoc.y;
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x[ 5 ] = ( float )TableSin( flNeg ) * flTangentLen + vViewerLoc.x;
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y[ 5 ] = ( float )TableCos( flNeg ) * flTangentLen + vViewerLoc.y;
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#endif
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// Msg( "%g, %g\n", RAD2DEG( flPos ), RAD2DEG( flNeg ) );
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CFOW_2DPlane Plane;
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Plane.Init( x[ 5 ], y[ 5 ], x[ 0 ], y[ 0 ] );
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int nUnits = pViewer->GetRadiusUnits();
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int *pVisibility = pViewer->GetVisibilityRadius();
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Vector vCenterLocation = vViewerLoc;
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float flDistance = Plane.DistanceFrom( vCenterLocation.x, vCenterLocation.y );
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if ( flDistance < 0.0f )
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{
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return;
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}
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#ifdef SLOW_PATH
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CFOW_2DPlane Edge1, Edge2;
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Edge1.Init( vCenterLocation.x, vCenterLocation.y, x[ 0 ], y[ 0 ] );
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Edge2.Init( x[ 5 ], y[ 5 ], vCenterLocation.x, vCenterLocation.y );
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float flDegreeAmount = 360.0f / nUnits;
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float flCurrentDegree = 0.0f;
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for ( int i = 0; i < nUnits; i++, flCurrentDegree += flDegreeAmount )
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{
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Vector vLocation = vViewerLoc;
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Vector vDelta;
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vDelta.x = sin( DEG2RAD( flCurrentDegree ) );
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vDelta.y = cos( DEG2RAD( flCurrentDegree ) );
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vLocation += vDelta * flViewerRadius;
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float flDistance = Plane.DistanceFromRay( vCenterLocation.x, vCenterLocation.y, vDelta.x, vDelta.y );
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if ( flDistance >= 0.0f )
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{
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flDistance *= flDistance;
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if ( flDistance >= 0.0f && flDistance < pVisibility[ i ] )
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{
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if ( Edge1.PointInFront( vLocation.x, vLocation.y ) && Edge2.PointInFront( vLocation.x, vLocation.y ) )
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{
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pVisibility[ i ] = flDistance;
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}
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}
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}
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}
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#else
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float flCurrentDegree, flFinishDegree;
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int nStartIndex;
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if ( flPos < flNeg )
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{
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flCurrentDegree = flPos;
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flFinishDegree = flNeg;
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}
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else
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{
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flCurrentDegree = flNeg;
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flFinishDegree = flPos;
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}
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float flDegreeAmount = 2.0f * M_PI_F / nUnits;
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nStartIndex = ( int )( flCurrentDegree / flDegreeAmount ) % nUnits;
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if ( nStartIndex < 0 )
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{
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nStartIndex += nUnits;
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}
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float flHorizontalGridSize = pFoW->GetHorizontalGridSize();
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for ( int i = nStartIndex; flCurrentDegree < flFinishDegree; i++, flCurrentDegree += flDegreeAmount )
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{
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Vector vDelta;
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if ( i >= nUnits )
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{
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i = 0;
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}
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vDelta.x = TableSin( flCurrentDegree );
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vDelta.y = TableCos( flCurrentDegree );
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float flDistance = Plane.DistanceFromRay( vCenterLocation.x, vCenterLocation.y, vDelta.x, vDelta.y );
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if ( flDistance >= 0.0f )
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{
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flDistance += flHorizontalGridSize * 1.1f; // back off a bit
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flDistance *= flDistance;
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if ( flDistance < pVisibility[ i ] )
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{
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pVisibility[ i ] = flDistance;
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}
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}
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}
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#endif
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input :
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//-----------------------------------------------------------------------------
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void CFoW_RadiusOccluder::DrawDebugInfo( Vector &vLocation, float flViewRadius, unsigned nFlags )
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{
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if ( ( nFlags & FOW_DEBUG_SHOW_OCCLUDERS ) == 0 )
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{
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return;
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}
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Vector vDiff = vLocation - m_vLocation;
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if ( vDiff.Length2D() > flViewRadius + m_flRadius )
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{
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return;
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}
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if ( ( nFlags & FOW_DEBUG_SHOW_OCCLUDERS ) != 0 )
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{
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debugoverlay->AddSphereOverlay( m_vLocation, m_flRadius, 10, 10, 255, 0, 0, 127, FOW_DEBUG_VIEW_TIME );
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debugoverlay->AddBoxOverlay( m_vLocation, Vector( -16.0f, -16.0f, -16.0f ), Vector( 16.0f, 16.0f, 16.0f ), QAngle( 0, 0, 0 ), 255, 0, 0, 127, FOW_DEBUG_VIEW_TIME );
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}
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}
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#include <tier0/memdbgoff.h>
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