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engines/hpl1/engine/math/Frustum.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * Copyright (C) 2006-2010 - Frictional Games
+ *
+ * This file is part of HPL1 Engine.
+ */
+
+#ifndef HPL_FRUSTUM_H
+#define HPL_FRUSTUM_H
+
+#include "hpl1/engine/graphics/GraphicsTypes.h"
+#include "hpl1/engine/math/BoundingVolume.h"
+#include "hpl1/engine/math/MathTypes.h"
+#include "hpl1/engine/system/SystemTypes.h"
+
+namespace hpl {
+
+class iLowLevelGraphics;
+
+enum eFrustumPlane {
+	eFrustumPlane_Left = 0,
+	eFrustumPlane_Right = 1,
+	eFrustumPlane_Bottom = 2,
+	eFrustumPlane_Top = 3,
+	eFrustumPlane_Near = 4,
+	eFrustumPlane_Far = 5,
+	eFrustumPlane_LastEnum = 7,
+};
+
+enum eFrustumCollision {
+	eFrustumCollision_Inside,
+	eFrustumCollision_Outside,
+	eFrustumCollision_Intersect,
+	eFrustumCollision_LastEnum
+};
+
+class cFrustum {
+public:
+	cFrustum();
+
+	void SetViewProjMatrix(const cMatrixf &a_mtxProj, const cMatrixf &a_mtxView,
+						   float afFarPlane, float afNearPlane, float afFOV, float afAspect,
+						   const cVector3f &avOrigin, bool abInfFarPlane = false);
+
+	cPlanef GetPlane(eFrustumPlane aType);
+
+	eFrustumCollision CollideBoundingVolume(cBoundingVolume *aBV);
+
+	eFrustumCollision CollideFustrumSphere(cBoundingVolume *aBV);
+
+	eFrustumCollision CollideBVSphere(cBoundingVolume *aBV);
+	eFrustumCollision CollideBVAABB(cBoundingVolume *aBV);
+
+	/**
+	 * Checks intersection with a line
+	 */
+	bool CheckLineIntersection(const cVector3f &avPoint1, const cVector3f &avPoint2);
+
+	/**
+	 * Checks intersection with a quad mesh.
+	 * \param apPoints the points of the quad mesh, every 4 points is a face.
+	 */
+	bool CheckQuadMeshIntersection(tVector3fVec *apPoints);
+
+	bool CheckVolumeIntersection(cShadowVolumeBV *apVolume);
+
+	cSpheref GetBoundingSphere() { return mBoundingSphere; }
+	const cBoundingVolume &GetBoundingVolume() { return mBoundingVolume; }
+
+	const cVector3f &GetOrigin();
+	cBoundingVolume *GetOriginBV();
+
+	cVector3f GetForward();
+
+	void Draw(iLowLevelGraphics *apLowLevelGraphics);
+
+private:
+	void UpdatePlanes();
+	void UpdateSphere();
+	void UpdateEndPoints();
+	void UpdateBV();
+
+	float mfFarPlane;
+	float mfNearPlane;
+	float mfAspect;
+	float mfFOV;
+
+	bool mbInfFarPlane;
+
+	cVector3f mvOrigin;
+	cBoundingVolume mOriginBV;
+
+	cMatrixf m_mtxViewProj;
+	cMatrixf m_mtxModelView;
+	cPlanef mPlane[6];
+	cSpheref mBoundingSphere;
+	cBoundingVolume mBoundingVolume;
+
+	cVector3f mvEndPoints[4];
+	tVector3fVec mvPoints;
+};
+
+} // namespace hpl
+
+#endif // HPL_FRUSTUM_H