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allow more granular background orientations #7183

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allow more granular background orientations #7183

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16 changes: 16 additions & 0 deletions code/math/floating.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@
#include <cfloat>
#include <limits>

#include "globalincs/pstypes.h" // for PI

extern float frand();
extern int rand_chance(float frametime, float chance = 1.0f);
float frand_range(float min, float max);
Expand Down Expand Up @@ -51,6 +53,20 @@ inline bool fl_is_nan(float fl) {
// convert a measurement in radians to degrees
#define fl_degrees(fl) (static_cast<float>((fl) * (180.0f / PI)))

constexpr float DEGREE_UB = 359.99f; // upper bound in degrees when rounding to 100ths place

// convert a measurement in radians to degrees, rounding to the nearest .01 (used in FRED)
constexpr float fl_degrees_100ths(float fl)
{
float val = fl_degrees(fl);

float new_val = fl2ir(val * 100.0f) / 100.0f;
if (new_val > DEGREE_UB)
new_val -= 360.0f;

return new_val;
}

// sees if a floating point number is within a certain threshold (by default, epsilon) of zero
inline bool fl_near_zero(float a, float e = std::numeric_limits<float>::epsilon())
{
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