61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
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#ifndef INC_GSCREENTOWORLD_H
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#define INC_GSCREENTOWORLD_H
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/*****************************************************************
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Filename : GScreenToWorld.h
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Content : Screen to World reverse transform helper class
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Created : Jan 15, 2010
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Authors : Mustafa Thamer
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History :
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Copyright : (c) 2010 Scaleform Corp. All Rights Reserved.
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Licensees may use this file in accordance with the valid Scaleform
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Commercial License Agreement provided with the software.
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This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
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THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR ANY PURPOSE.
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**********************************************************************/
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#include "GMatrix3D.h"
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//
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// This class computes a screen to world transform.
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// It requires the following inputs to be set:
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// normalized screen coords - these are from the mouse generally and should be -1 to 1
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// view, perspective and word matrices - these are what are set in the renderer and on the object
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//
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class GScreenToWorld
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{
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public:
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GINLINE GScreenToWorld() : Sx(FLT_MAX), Sy(FLT_MAX), LastX(FLT_MAX), LastY(FLT_MAX),
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MatProj(NULL), MatView(NULL), MatWorld(NULL) { }
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// required inputs
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GINLINE void SetNormalizedScreenCoords(Float nsx, Float nsy) { Sx=nsx; Sy=-nsy; } // note: the Y is inverted
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GINLINE void SetView(const GMatrix3D &mView) { MatView = &mView; }
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GINLINE void SetPerspective(const GMatrix3D &mProj) { MatProj = &mProj; }
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GINLINE void SetWorld(const GMatrix3D &mWorld) { MatWorld = &mWorld; }
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// computes the answer
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void GetWorldPoint(GPointF *ptOut);
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void GetWorldPoint(GPoint3F *ptOut);
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GPointF GetLastWorldPoint() const { return GPointF(LastX, LastY); }
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private:
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void VectorMult(float *po, const float *pa, float x, float y, float z, float w);
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void VectorMult(float *po, const float *pa, const float *v);
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void VectorInvHomog(float *v);
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Float Sx, Sy;
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Float LastX, LastY;
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const GMatrix3D *MatProj;
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const GMatrix3D *MatView;
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const GMatrix3D *MatWorld;
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};
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#endif // INC_GSCREENTOWORLD_H
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