Differential D4739 Diff 20932 source/graphics/HFTracer.cpp

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source/graphics/HFTracer.cpp

	/* Copyright (C) 2021 Wildfire Games.			/* Copyright (C) 2021 Wildfire Games.
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	* This file is part of 0 A.D.			* This file is part of 0 A.D.
	*			*
	* 0 A.D. is free software: you can redistribute it and/or modify			* 0 A.D. is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by			* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 2 of the License, or			* the Free Software Foundation, either version 2 of the License, or
	* (at your option) any later version.			* (at your option) any later version.
	*			*
	* 0 A.D. is distributed in the hope that it will be useful,			* 0 A.D. is distributed in the hope that it will be useful,
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	// (N shouldn't be too huge else it'll hurt performance a little when			// (N shouldn't be too huge else it'll hurt performance a little when
	// RayIntersect loops through it all.)			// RayIntersect loops through it all.)
	// CTerrain::CalcPosition implements clamp-to-edge behaviour so the tracer			// CTerrain::CalcPosition implements clamp-to-edge behaviour so the tracer
	// will have that behaviour.			// will have that behaviour.
	static const int MARGIN_SIZE = 64;			static const int MARGIN_SIZE = 64;

	///////////////////////////////////////////////////////////////////////////////			///////////////////////////////////////////////////////////////////////////////
	// CHFTracer constructor			// CHFTracer constructor
	CHFTracer::CHFTracer(CTerrain *pTerrain):			CHFTracer::CHFTracer(CTerrain& terrain):
	m_pTerrain(pTerrain),			m_Terrain(terrain),
	m_Heightfield(m_pTerrain->GetHeightMap()),			m_Heightfield(m_Terrain.GetHeightMap()),
	m_MapSize(m_pTerrain->GetVerticesPerSide()),			m_MapSize(m_Terrain.GetVerticesPerSide()),
	m_CellSize((float)TERRAIN_TILE_SIZE),			m_CellSize((float)TERRAIN_TILE_SIZE),
	m_HeightScale(HEIGHT_SCALE)			m_HeightScale(HEIGHT_SCALE)
	{			{
	}			}


	///////////////////////////////////////////////////////////////////////////////			///////////////////////////////////////////////////////////////////////////////
	// RayTriIntersect: intersect a ray with triangle defined by vertices			// RayTriIntersect: intersect a ray with triangle defined by vertices
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	// CellIntersect: test if ray intersects either of the triangles in the given			// CellIntersect: test if ray intersects either of the triangles in the given
	// cell - return hit result, and distance to hit, if hit occurred			// cell - return hit result, and distance to hit, if hit occurred
	bool CHFTracer::CellIntersect(int cx, int cz, const CVector3D& origin, const CVector3D& dir, float& dist) const			bool CHFTracer::CellIntersect(int cx, int cz, const CVector3D& origin, const CVector3D& dir, float& dist) const
	{			{
	bool res=false;			bool res=false;

	// get vertices for this cell			// get vertices for this cell
	CVector3D vpos[4];			CVector3D vpos[4];
	m_pTerrain->CalcPosition(cx,cz,vpos[0]);			m_Terrain.CalcPosition(cx,cz,vpos[0]);
	m_pTerrain->CalcPosition(cx+1,cz,vpos[1]);			m_Terrain.CalcPosition(cx+1,cz,vpos[1]);
	m_pTerrain->CalcPosition(cx+1,cz+1,vpos[2]);			m_Terrain.CalcPosition(cx+1,cz+1,vpos[2]);
	m_pTerrain->CalcPosition(cx,cz+1,vpos[3]);			m_Terrain.CalcPosition(cx,cz+1,vpos[3]);

	dist=1.0e30f;			dist=1.0e30f;
	if (RayTriIntersect(vpos[0],vpos[1],vpos[2],origin,dir,dist)) {			if (RayTriIntersect(vpos[0],vpos[1],vpos[2],origin,dir,dist)) {
	res=true;			res=true;
	}			}

	if (RayTriIntersect(vpos[0],vpos[2],vpos[3],origin,dir,dist)) {			if (RayTriIntersect(vpos[0],vpos[2],vpos[3],origin,dir,dist)) {
	res=true;			res=true;
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