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// This file contains declarations of various math functions.
//

#ifndef O3D_CORE_CROSS_MATH_UTILITIES_H_
#define O3D_CORE_CROSS_MATH_UTILITIES_H_

#include "core/cross/types.h"

namespace Vectormath {
namespace Aos {

// Creates a perspective projection matrix.
Matrix4 CreatePerspectiveMatrix(float vertical_field_of_view_radians,
                                float aspect,
                                float z_near,
                                float z_far);

// Creates a frustum projection matrix.
Matrix4 CreateFrustumMatrix(float left,
                            float right,
                            float bottom,
                            float top,
                            float z_near,
                            float z_far);

// Creates an orthographic projection matrix.
Matrix4 CreateOrthographicMatrix(float left,
                                 float right,
                                 float bottom,
                                 float top,
                                 float z_near,
                                 float z_far);

// Converts a 32 bit float to a 16 bit float.
uint16 FloatToHalf(float value);
}  // namespace Vectormath
}  // namespace Aos

namespace o3d {
// Calculates the Frobenius norm of a 3x3 matrix.
// See http://en.wikipedia.org/wiki/Matrix_norm
float FrobeniusNorm(const Matrix3& matrix);

// Calculates the Frobenius norm of a 4x4 matrix.
// See http://en.wikipedia.org/wiki/Matrix_norm
float FrobeniusNorm(const Matrix4& matrix);

const float kPi = acosf(-1.0f);
}  // namespace o3d

#endif  // O3D_CORE_CROSS_MATH_UTILITIES_H_