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226 строки
7.3 KiB
C++
226 строки
7.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Oracle Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_3DMATRIX_H
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#define GFX_3DMATRIX_H
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#include <gfxTypes.h>
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#include <gfxMatrix.h>
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#include <math.h>
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/**
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* This class represents a 3D transformation. The matrix is laid
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* out as follows:
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*
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* _11 _12 _13 _14
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* _21 _22 _23 _24
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* _31 _32 _33 _34
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* _41 _42 _43 _44
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*
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* This matrix is treated as row-major. Assuming we consider our vectors row
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* vectors, this matrix type will be identical in memory to the OpenGL and D3D
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* matrices. OpenGL matrices are column-major, however OpenGL also treats
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* vectors as column vectors, the double transposition makes everything work
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* out nicely.
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*/
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class THEBES_API gfx3DMatrix
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{
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public:
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/**
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* Create matrix.
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*/
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inline gfx3DMatrix(void);
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/**
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* Matrix multiplication.
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*/
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inline gfx3DMatrix operator*(const gfx3DMatrix &aMatrix) const;
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/**
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* Return true if this matrix and |aMatrix| are the same matrix.
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*/
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inline bool operator==(const gfx3DMatrix& aMatrix) const;
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/**
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* Create a 3D matrix from a gfxMatrix 2D affine transformation.
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*
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* \param aMatrix gfxMatrix 2D affine transformation.
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*/
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static inline gfx3DMatrix From2D(const gfxMatrix &aMatrix);
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/**
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* Returns true if the matrix is isomorphic to a 2D affine transformation
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* (i.e. as obtained by From2D). If it is, optionally returns the 2D
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* matrix in aMatrix.
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*/
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PRBool Is2D(gfxMatrix* aMatrix = nsnull) const;
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/**
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* Returns true if the matrix is the identity matrix. The most important
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* property we require is that gfx3DMatrix().IsIdentity() returns true.
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*/
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inline PRBool IsIdentity() const;
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/**
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* Create a translation matrix.
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*
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* \param aX Translation on X-axis.
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* \param aY Translation on Y-axis.
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* \param aZ Translation on Z-axis.
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*/
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static inline gfx3DMatrix Translation(float aX, float aY, float aZ);
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/**
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* Create a scale matrix. Scales uniformly along all axes.
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*
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* \param aScale Scale factor
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*/
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static inline gfx3DMatrix Scale(float aFactor);
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/**
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* Create a scale matrix.
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*/
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static inline gfx3DMatrix Scale(float aX, float aY, float aZ);
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/** Matrix elements */
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float _11, _12, _13, _14;
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float _21, _22, _23, _24;
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float _31, _32, _33, _34;
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float _41, _42, _43, _44;
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};
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inline
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gfx3DMatrix::gfx3DMatrix(void)
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{
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_11 = _22 = _33 = _44 = 1.0f;
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_12 = _13 = _14 = 0.0f;
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_21 = _23 = _24 = 0.0f;
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_31 = _32 = _34 = 0.0f;
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_41 = _42 = _43 = 0.0f;
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}
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inline gfx3DMatrix
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gfx3DMatrix::operator*(const gfx3DMatrix &aMatrix) const
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{
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gfx3DMatrix matrix;
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matrix._11 = _11 * aMatrix._11 + _12 * aMatrix._21 + _13 * aMatrix._31 + _14 * aMatrix._41;
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matrix._21 = _21 * aMatrix._11 + _22 * aMatrix._21 + _23 * aMatrix._31 + _24 * aMatrix._41;
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matrix._31 = _31 * aMatrix._11 + _32 * aMatrix._21 + _33 * aMatrix._31 + _34 * aMatrix._41;
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matrix._41 = _41 * aMatrix._11 + _42 * aMatrix._21 + _43 * aMatrix._31 + _44 * aMatrix._41;
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matrix._12 = _11 * aMatrix._12 + _12 * aMatrix._22 + _13 * aMatrix._32 + _14 * aMatrix._42;
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matrix._22 = _21 * aMatrix._12 + _22 * aMatrix._22 + _23 * aMatrix._32 + _24 * aMatrix._42;
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matrix._32 = _31 * aMatrix._12 + _32 * aMatrix._22 + _33 * aMatrix._32 + _34 * aMatrix._42;
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matrix._42 = _41 * aMatrix._12 + _42 * aMatrix._22 + _43 * aMatrix._32 + _44 * aMatrix._42;
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matrix._13 = _11 * aMatrix._13 + _12 * aMatrix._23 + _13 * aMatrix._33 + _14 * aMatrix._43;
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matrix._23 = _21 * aMatrix._13 + _22 * aMatrix._23 + _23 * aMatrix._33 + _24 * aMatrix._43;
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matrix._33 = _31 * aMatrix._13 + _32 * aMatrix._23 + _33 * aMatrix._33 + _34 * aMatrix._43;
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matrix._43 = _41 * aMatrix._13 + _42 * aMatrix._23 + _43 * aMatrix._33 + _44 * aMatrix._43;
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matrix._14 = _11 * aMatrix._14 + _12 * aMatrix._24 + _13 * aMatrix._34 + _14 * aMatrix._44;
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matrix._24 = _21 * aMatrix._14 + _22 * aMatrix._24 + _23 * aMatrix._34 + _24 * aMatrix._44;
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matrix._34 = _31 * aMatrix._14 + _32 * aMatrix._24 + _33 * aMatrix._34 + _34 * aMatrix._44;
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matrix._44 = _41 * aMatrix._14 + _42 * aMatrix._24 + _43 * aMatrix._34 + _44 * aMatrix._44;
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return matrix;
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}
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inline bool
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gfx3DMatrix::operator==(const gfx3DMatrix& o) const
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{
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// XXX would be nice to memcmp here, but that breaks IEEE 754 semantics
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return _11 == o._11 && _12 == o._12 && _13 == o._13 && _14 == o._14 &&
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_21 == o._21 && _22 == o._22 && _23 == o._23 && _24 == o._24 &&
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_31 == o._31 && _32 == o._32 && _33 == o._33 && _34 == o._34 &&
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_41 == o._41 && _42 == o._42 && _43 == o._43 && _44 == o._44;
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}
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inline gfx3DMatrix
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gfx3DMatrix::From2D(const gfxMatrix &aMatrix)
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{
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gfx3DMatrix matrix;
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matrix._11 = (float)aMatrix.xx;
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matrix._12 = (float)aMatrix.yx;
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matrix._21 = (float)aMatrix.xy;
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matrix._22 = (float)aMatrix.yy;
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matrix._41 = (float)aMatrix.x0;
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matrix._42 = (float)aMatrix.y0;
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return matrix;
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}
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inline PRBool
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gfx3DMatrix::IsIdentity() const
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{
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return _11 == 1.0f && _12 == 0.0f && _13 == 0.0f && _14 == 0.0f &&
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_21 == 0.0f && _22 == 1.0f && _23 == 0.0f && _24 == 0.0f &&
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_31 == 0.0f && _32 == 0.0f && _33 == 1.0f && _34 == 0.0f &&
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_41 == 0.0f && _42 == 0.0f && _43 == 0.0f && _44 == 1.0f;
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}
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inline gfx3DMatrix
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gfx3DMatrix::Translation(float aX, float aY, float aZ)
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{
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gfx3DMatrix matrix;
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matrix._41 = aX;
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matrix._42 = aY;
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matrix._43 = aZ;
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return matrix;
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}
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inline gfx3DMatrix
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gfx3DMatrix::Scale(float aFactor)
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{
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gfx3DMatrix matrix;
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matrix._11 = matrix._22 = matrix._33 = aFactor;
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return matrix;
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}
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inline gfx3DMatrix
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gfx3DMatrix::Scale(float aX, float aY, float aZ)
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{
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gfx3DMatrix matrix;
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matrix._11 = aX;
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matrix._22 = aY;
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matrix._33 = aZ;
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return matrix;
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}
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#endif /* GFX_3DMATRIX_H */
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