1 #ifndef __DALI_MATRIX3_H__
2 #define __DALI_MATRIX3_H__
5 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/math/vector3.h>
23 #include <dali/public-api/math/matrix.h>
24 #include <dali/public-api/common/type-traits.h>
29 * @addtogroup dali_core_math
37 * @brief A 3x3 matrix.
39 * The matrix is stored as a flat array and is Column Major, i.e. the storage order is as follows (numbers represent
50 * Each axis is contiguous in memory, so the x-axis corresponds to elements 0, 1 and 2, the y-axis corresponds to
51 * elements 3, 4 and 5, and the z-axis corresponds to elements 6, 7 and 8.
55 class DALI_CORE_API Matrix3
59 friend DALI_CORE_API std::ostream& operator<< (std::ostream& o, const Matrix3& matrix);
62 * @brief The identity matrix.
64 static const Matrix3 IDENTITY;
73 * @brief Copy Constructor.
76 * @param[in] m A reference to the copied 3x3 matrix
78 Matrix3(const Matrix3& m);
84 * @param[in] m A 4x4 matrix. The translation and shear components are ignored
86 Matrix3(const Matrix& m);
92 * @param[in] s00 First element
93 * @param[in] s01 Second element
94 * @param[in] s02 Third element
95 * @param[in] s10 Fourth element
96 * @param[in] s11 Fifth element
97 * @param[in] s12 Sixth element
98 * @param[in] s20 Seventh element
99 * @param[in] s21 Eighth element
100 * @param[in] s22 Ninth element
102 Matrix3(float s00, float s01, float s02, float s10, float s11, float s12, float s20, float s21, float s22);
105 * @brief Assignment Operator.
107 * @param[in] matrix From which to copy values
108 * @return Reference to this object
110 Matrix3& operator=( const Matrix3& matrix );
113 * @brief Assignment Operator.
115 * @param[in] matrix A reference to the copied matrix
116 * @return A reference to this
118 Matrix3& operator=( const Matrix& matrix );
121 * @brief The equality operator.
123 * Utilizes appropriate machine epsilon values.
126 * @param[in] rhs The Matrix to compare this to
127 * @return True if the matrices are equal
129 bool operator==(const Matrix3 & rhs) const;
132 * @brief The inequality operator.
134 * Utilizes appropriate machine epsilon values.
137 * @param[in] rhs The Matrix to compare this to
138 * @return true if the matrices are equal
140 bool operator!=(const Matrix3 & rhs) const;
151 * @brief Sets the matrix to the identity matrix.
157 * @brief Returns the contents of the matrix as an array of 9 floats.
159 * The order of the values for a matrix is:
162 * [ xAxis.x, xAxis.y, xAxis.z, yAxis.x, yAxis.y, yAxis.z, zAxis.x, zAxis.y, zAxis.z ]
166 * @return The matrix contents as an array of 9 floats
168 const float* AsFloat() const {return &mElements[0];}
171 * @brief Returns the contents of the matrix as an array of 9 floats.
173 * The order of the values for a matrix is:
176 * [ xAxis.x, xAxis.y, xAxis.z, yAxis.x, yAxis.y, yAxis.z, zAxis.x, zAxis.y, zAxis.z ]
180 * @return The matrix contents as an array of 9 floats
182 float* AsFloat() {return &mElements[0];}
185 * @brief Inverts the matrix.
188 * @return True if successful
193 * @brief Swaps the rows to columns.
195 * @return True if successful
200 * @brief Multiplies all elements of the matrix by the scale value.
203 * @param[in] scale The value by which to scale the whole matrix
205 void Scale(float scale);
208 * @brief Magnitude returns the average of the absolute values of the
211 * (The Magnitude of the unit matrix is therefore 1)
213 * @return The magnitude - always positive
215 float Magnitude() const;
218 * @brief If the matrix is invertible, then this method inverts, transposes
219 * and scales the matrix such that the resultant element values
222 * If the matrix is not invertible, then the matrix is left unchanged.
225 * @return @c true if the matrix is invertible, otherwise @c false
227 bool ScaledInverseTranspose();
230 * @brief Function to multiply two matrices and store the result onto third.
232 * Use this method in time critical path as it does not require temporaries
237 * @param[out] result Result of the multiplication
238 * @param[in] lhs Matrix, this can be same matrix as result
239 * @param[in] rhs Matrix, this cannot be same matrix as result
241 static void Multiply( Matrix3& result, const Matrix3& lhs, const Matrix3& rhs );
245 float mElements[9]; ///< The elements of the matrix
249 * @brief Prints a 3x3 matrix.
252 * @param[in] o The output stream operator
253 * @param[in] matrix The matrix to print
254 * @return The output stream operator
256 DALI_CORE_API std::ostream& operator<< (std::ostream& o, const Matrix3& matrix);
258 // Allow Matrix3 to be treated as a POD type
259 template <> struct TypeTraits< Matrix3 > : public BasicTypes< Matrix3 > { enum { IS_TRIVIAL_TYPE = true }; };
266 #endif //__DALI_MATRIX3_H__