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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef FLOAT4_H
#define FLOAT4_H
#include "System/float3.h"
#include "System/creg/creg_cond.h"
/** Float3 with a fourth data member, which is basically unused but required
to be able to pass data into e.g. OpenGL functions that expect
an array of 4 floats. */
struct float4 : public float3
{
CR_DECLARE_STRUCT(float4);
float w;
float4();
float4(const float3& f, const float w = 0.0f) : float3(f), w(w) {}
float4(const float* f) : float3(f[0], f[1], f[2]), w(f[3]) {}
float4(const float x, const float y, const float z, const float w = 0.0f)
: float3(x, y, z), w(w) {}
inline float4& operator= (const float f[4]) {
x = f[0];
y = f[1];
z = f[2];
w = f[3];
return *this;
}
inline float4& operator= (const float3& f) {
x = f.x;
y = f.y;
z = f.z;
return *this;
}
inline float4& operator= (const float4& f) {
x = f.x;
y = f.y;
z = f.z;
w = f.w;
return *this;
}
inline bool operator== (const float4& f) const {
return math::fabs(x - f.x) <= math::fabs(float3::CMP_EPS * x)
&& math::fabs(y - f.y) <= math::fabs(float3::CMP_EPS * y)
&& math::fabs(z - f.z) <= math::fabs(float3::CMP_EPS * z)
&& math::fabs(w - f.w) <= math::fabs(float3::CMP_EPS * w);
}
inline bool operator!= (const float4& f) const {
return !(*this == f);
}
inline float dot4(const float4& f) const {
return (x * f.x) + (y * f.y) + (z * f.z) + (w * f.w);
}
/// Allows implicit conversion to float* (for passing to gl functions)
operator const float* () const { return &x; }
operator float* () { return &x; }
};
#endif /* FLOAT4_H */
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