#include "externals.hh"
#include "c-utilities.hh"


void updateAngle(
		float& initial ,
		const float delta
	)
{
	initial = fmod( initial + delta + 540 , 360 ) - 180;
}

void anglesToMatrix(
		float const* angles ,
		float* matrix )
{
	float c[3] , s[3];
	for ( int i = 0 ; i < 3 ; i ++ ) {
		const float a = M_PI * angles[ i ] / 180;
		c[i] = cos( a );
		s[i] = sin( a );
	}
	matrix[0] = c[1]*c[2];
	matrix[1] = s[0]*s[1]*c[2] - c[0]*s[2];
	matrix[2] = s[0]*s[2] + c[0]*s[1]*c[2];
	matrix[3] = c[1]*s[2];
	matrix[4] = c[0]*c[2] + s[0]*s[1]*s[2];
	matrix[5] = c[0]*s[1]*s[2] - s[0]*c[2];
	matrix[6] = -s[1];
	matrix[7] = s[0]*c[1];
	matrix[8] = c[0]*c[1];
}

/*----------------------------------------------------------------------------*/

T_String GetAbsolutePath(
		T_String const& path )
{
	char* const rp( realpath( (char*) path.toOSString( ).data( ) , nullptr ) );
	if ( !rp ) {
		return {};
	}

	const T_String rv( rp );
	free( rp );
	return rv;
}

T_String GetParentPath(
		T_String const& path )
{
	auto buffer( path.toOSString( ) );

	char* const rp( realpath( dirname( (char*) buffer.data( ) ) , nullptr ) );
	if ( !rp ) {
		return {};
	}

	const T_String rv( rp );
	free( rp );
	return rv;
}