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/* SPDX-FileCopyrightText: 2020-2022 Blender Authors
*
* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup intern_sky_modal
*/
#ifndef __SKY_FLOAT3_H__
#define __SKY_FLOAT3_H__
// minimal float3 + util_math.h implementation for nishita sky model
#include <math.h>
#ifndef M_PI_F
# define M_PI_F (3.1415926535897932f) /* pi */
#endif
#ifndef M_PI_2_F
# define M_PI_2_F (1.5707963267948966f) /* pi/2 */
#endif
#ifndef M_2PI_F
# define M_2PI_F (6.2831853071795864f) /* 2*pi */
#endif
struct float3 {
float x, y, z;
float3() = default;
float3(const float *ptr) : x{ptr[0]}, y{ptr[1]}, z{ptr[2]} {}
float3(const float (*ptr)[3]) : float3((const float *)ptr) {}
explicit float3(float value) : x(value), y(value), z(value) {}
explicit float3(int value) : x(value), y(value), z(value) {}
float3(float x, float y, float z) : x{x}, y{y}, z{z} {}
operator const float *() const
{
return &x;
}
operator float *()
{
return &x;
}
friend float3 operator*(const float3 &a, float b)
{
return {a.x * b, a.y * b, a.z * b};
}
friend float3 operator*(float b, const float3 &a)
{
return {a.x * b, a.y * b, a.z * b};
}
friend float3 operator-(const float3 &a, const float3 &b)
{
return {a.x - b.x, a.y - b.y, a.z - b.z};
}
friend float3 operator-(const float3 &a)
{
return {-a.x, -a.y, -a.z};
}
float length_squared() const
{
return x * x + y * y + z * z;
}
float length() const
{
return sqrt(length_squared());
}
static float distance(const float3 &a, const float3 &b)
{
return (a - b).length();
}
friend float3 operator+(const float3 &a, const float3 &b)
{
return {a.x + b.x, a.y + b.y, a.z + b.z};
}
void operator+=(const float3 &b)
{
this->x += b.x;
this->y += b.y;
this->z += b.z;
}
friend float3 operator*(const float3 &a, const float3 &b)
{
return {a.x * b.x, a.y * b.y, a.z * b.z};
}
};
inline float sqr(float a)
{
return a * a;
}
inline float3 make_float3(float x, float y, float z)
{
return float3(x, y, z);
}
inline float dot(const float3 &a, const float3 &b)
{
return a.x * b.x + a.y * b.y + a.z * b.z;
}
inline float distance(const float3 &a, const float3 &b)
{
return float3::distance(a, b);
}
inline float len_squared(float3 f)
{
return f.length_squared();
}
inline float len(float3 f)
{
return f.length();
}
inline float reduce_add(float3 f)
{
return f.x + f.y + f.z;
}
#endif /* __SKY_FLOAT3_H__ */
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