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[Hgengine-cvs] SF.net SVN: hgengine:[208] Mercury2/src
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From: <axl...@us...> - 2009-04-12 16:32:57
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Revision: 208
http://hgengine.svn.sourceforge.net/hgengine/?rev=208&view=rev
Author: axlecrusher
Date: 2009-04-12 16:32:55 +0000 (Sun, 12 Apr 2009)
Log Message:
-----------
Move frustum into own file
Added Paths:
-----------
Mercury2/src/Frustum.cpp
Mercury2/src/Frustum.h
Added: Mercury2/src/Frustum.cpp
===================================================================
--- Mercury2/src/Frustum.cpp (rev 0)
+++ Mercury2/src/Frustum.cpp 2009-04-12 16:32:55 UTC (rev 208)
@@ -0,0 +1,135 @@
+#include <Frustum.h>
+
+void Frustum::SetPerspective( float fov, float aspect, float znear, float zfar )
+{
+ float xmin, xmax, ymin, ymax;
+
+ m_fov = fov;
+ m_aspect = aspect;
+ m_zNear = znear;
+ m_zFar = zfar;
+
+ float tang = TAN(m_fov * Q_PI / 360.0);
+
+ m_nh = ymax = m_zNear * tang; //nh
+ ymin = -ymax;
+ xmin = ymin * m_aspect;
+ m_nw = xmax = ymax * m_aspect; //nw
+
+ m_fh = m_zFar*tang;
+ m_fw = m_fh*aspect;
+
+ ComputeFrustum(xmin, xmax, ymin, ymax, m_zNear, m_zFar);
+}
+
+void Frustum::ComputeFrustum(float left, float right, float bottom, float top, float zNear, float zFar)
+{
+ float near2 = 2*zNear;
+ float rml = right-left;
+ float tmb = top - bottom;
+ float fmn = zFar - zNear;
+
+ float A = (right+left)/rml;
+ float B = (top+bottom)/tmb;
+ float C = -(zFar+zNear)/fmn;
+ float D = -(near2*zFar)/fmn;
+
+ m_frustum.Zero();
+
+ //row major
+ m_frustum[0][0] = near2/rml;
+ m_frustum[0][2] = A;
+ m_frustum[1][1] = near2/tmb;
+ m_frustum[1][2] = B;
+ m_frustum[2][2] = C;
+ m_frustum[2][3] = D;
+ m_frustum[3][2] = -1;
+
+// m_frustum.Transpose(); //XXX fix it to remove this
+}
+
+void Frustum::LookAt(const MercuryVertex& eye, const MercuryVector& look, const MercuryVector& up)
+{
+ //Right now this only builds the frustum planes
+ MercuryVector X,Y,Z;
+
+ Z = (eye - look).Normalize(); //direction behind camera
+ X = (up.CrossProduct(Z)).Normalize(); //X axis
+ Y = Z.CrossProduct( X ); //real up
+
+ m_nc = (eye - Z) * m_zNear;
+ m_fc = (eye - Z) * m_zFar;
+
+ m_planes[PNEAR].Setup(m_nc, Z*(-1));
+ m_planes[PFAR].Setup(m_fc, Z);
+// m_fc.Print();
+// Z.Print();
+ MercuryVector aux,normal;
+
+ aux = (m_nc + Y*m_nh) - eye;
+ aux.NormalizeSelf();
+ normal = aux * X;
+ m_planes[PTOP].Setup(m_nc+Y*m_nh,normal);
+
+ aux = (m_nc - Y*m_nh) - eye;
+ aux.NormalizeSelf();
+ normal = X * aux;
+ m_planes[PBOTTOM].Setup(m_nc-Y*m_nh,normal);
+
+ aux = (m_nc - X*m_nw) - eye;
+ aux.NormalizeSelf();
+ normal = aux * Y;
+ m_planes[PLEFT].Setup(m_nc-X*m_nw,normal);
+
+ aux = (m_nc + X*m_nw) - eye;
+ aux.NormalizeSelf();
+ normal = Y * aux;
+ m_planes[PRIGHT].Setup(m_nc+X*m_nw,normal);
+}
+
+/*
+void Frustum::LookAt()
+{
+
+}
+*/
+/*
+bool Frustum::IsPointInFrustum( float x, float y, float z )
+{
+ for( uint16_t i = 0; i < 6; ++i )
+ if( frustum[i][0] * x + frustum[i][1] * y + frustum[i][2] * z + frustum[i][3] <= 0 )
+ return false;
+ return true;
+}*/
+
+/****************************************************************************
+ * Copyright (C) 2009 by Joshua Allen *
+ * *
+ * *
+ * All rights reserved. *
+ * *
+ * Redistribution and use in source and binary forms, with or without *
+ * modification, are permitted provided that the following conditions *
+ * are met: *
+ * * Redistributions of source code must retain the above copyright *
+ * notice, this list of conditions and the following disclaimer. *
+ * * Redistributions in binary form must reproduce the above *
+ * copyright notice, this list of conditions and the following *
+ * disclaimer in the documentation and/or other materials provided *
+ * with the distribution. *
+ * * Neither the name of the Mercury Engine nor the names of its *
+ * contributors may be used to endorse or promote products derived *
+ * from this software without specific prior written permission. *
+ * *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR *
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT *
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, *
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY *
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE *
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
+ ***************************************************************************/
Added: Mercury2/src/Frustum.h
===================================================================
--- Mercury2/src/Frustum.h (rev 0)
+++ Mercury2/src/Frustum.h 2009-04-12 16:32:55 UTC (rev 208)
@@ -0,0 +1,70 @@
+#ifndef FRUSTUM_H
+#define FRUSTUM_H
+
+#include <MercuryMatrix.h>
+#include <MercuryPlane.h>
+
+enum PlanePos
+{
+ PTOP = 0,
+ PBOTTOM,
+ PLEFT,
+ PRIGHT,
+ PNEAR,
+ PFAR
+};
+
+class Frustum
+{
+
+ public:
+ void SetPerspective( float fov, float aspect, float znear, float zfar );
+ const MercuryMatrix& GetMatrix() const { return m_frustum; }
+ void ComputeFrustum(float left, float right, float bottom, float top, float zNear, float zFar);
+ void LookAt(const MercuryVertex& eye, const MercuryVector& look, const MercuryVector& up);
+
+ inline const MercuryPlane& GetPlane(int i) const { return m_planes[i]; }
+ private:
+
+ MercuryPlane m_planes[6];
+ MercuryMatrix m_frustum;
+
+ float m_aspect, m_fov, m_zNear, m_zFar;
+ float m_nh, m_nw, m_fh, m_fw;
+
+ MercuryVector m_nc, m_fc;
+};
+
+#endif
+
+/****************************************************************************
+ * Copyright (C) 2009 by Joshua Allen *
+ * *
+ * *
+ * All rights reserved. *
+ * *
+ * Redistribution and use in source and binary forms, with or without *
+ * modification, are permitted provided that the following conditions *
+ * are met: *
+ * * Redistributions of source code must retain the above copyright *
+ * notice, this list of conditions and the following disclaimer. *
+ * * Redistributions in binary form must reproduce the above *
+ * copyright notice, this list of conditions and the following *
+ * disclaimer in the documentation and/or other materials provided *
+ * with the distribution. *
+ * * Neither the name of the Mercury Engine nor the names of its *
+ * contributors may be used to endorse or promote products derived *
+ * from this software without specific prior written permission. *
+ * *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR *
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT *
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, *
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY *
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE *
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
+ ***************************************************************************/
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