TimeSourceWin32::TimeSourceWin32()
{
LARGE_INTEGER frequency;
::QueryPerformanceFrequency(&frequency);
POMDOG_ASSERT_MESSAGE(0 != frequency.QuadPart,
"High-resolution performance counter not supported by installed hardware.");
secondsPerTick = 1.0 / frequency.QuadPart;
}
T Clamp(const T& x, const T& min, const T& max)
{
static_assert(std::is_arithmetic<T>::value
|| Detail::IsTaggedFloatingPoint<T>::value, "");
POMDOG_ASSERT_MESSAGE(min < max, "In Clamp, maxval is out of range");
if (x < min) {
return min;
}
if (x > max) {
return max;
}
return x;
}
FloatingPointMatrix3x2<T>
FloatingPointMatrix3x2<T>::Invert(const FloatingPointMatrix3x2& matrix)
{
auto const determinant = matrix.Determinant();
static_assert(std::is_same<decltype(matrix.Determinant()), T>::value, "determinant is T");
POMDOG_ASSERT_MESSAGE(T{0} != determinant, "This is singular matrix");
auto const inverseDeterminant = T{1} / determinant;
auto const offsetX = matrix(2, 0);
auto const offsetY = matrix(2, 1);
return {
matrix(1, 1) * inverseDeterminant,
-matrix(0, 1) * inverseDeterminant,
-matrix(1, 0) * inverseDeterminant,
matrix(0, 0) * inverseDeterminant,
(matrix(1, 0) * offsetY - offsetX * matrix(1, 1)) * inverseDeterminant,
(offsetX * matrix(0, 1) - matrix(0, 0) * offsetY) * inverseDeterminant};
}
const T& FloatingPointMatrix3x2<T>::operator()(std::size_t row, std::size_t column) const
{
POMDOG_ASSERT_MESSAGE(row < RowSize, "row: out of range");
POMDOG_ASSERT_MESSAGE(column < ColumnSize, "column: out of range");
return m[row][column];
}
