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Orange
2026-04-23 19:48:55 +03:00
parent 42a8a5a763
commit b3ba9eaadf
3 changed files with 72 additions and 38 deletions
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53
include/omath/linear_algebra/mat.hpp
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@@ -707,6 +707,59 @@ namespace omath
else
std::unreachable();
}
// Horizontal-FOV variants — use these when the engine reports FOV as
// horizontal (UE's FMinimalViewInfo::FOV, Quake-family fov_x, etc.).
// X and Y scales derived as: X = 1 / tan(hfov/2), Y = aspect / tan(hfov/2).
template<class Type = float, MatStoreType St = MatStoreType::ROW_MAJOR,
NDCDepthRange DepthRange = NDCDepthRange::NEGATIVE_ONE_TO_ONE>
[[nodiscard]]
Mat<4, 4, Type, St> mat_perspective_left_handed_horizontal_fov(const float horizontal_fov,
const float aspect_ratio, const float near,
const float far) noexcept
{
const float inv_tan_half_hfov = 1.f / std::tan(angles::degrees_to_radians(horizontal_fov) / 2.f);
const float x_axis = inv_tan_half_hfov;
const float y_axis = inv_tan_half_hfov * aspect_ratio;
if constexpr (DepthRange == NDCDepthRange::ZERO_TO_ONE)
return {{x_axis, 0.f, 0.f, 0.f},
{0.f, y_axis, 0.f, 0.f},
{0.f, 0.f, far / (far - near), -(near * far) / (far - near)},
{0.f, 0.f, 1.f, 0.f}};
else if constexpr (DepthRange == NDCDepthRange::NEGATIVE_ONE_TO_ONE)
return {{x_axis, 0.f, 0.f, 0.f},
{0.f, y_axis, 0.f, 0.f},
{0.f, 0.f, (far + near) / (far - near), -(2.f * near * far) / (far - near)},
{0.f, 0.f, 1.f, 0.f}};
else
std::unreachable();
}
template<class Type = float, MatStoreType St = MatStoreType::ROW_MAJOR,
NDCDepthRange DepthRange = NDCDepthRange::NEGATIVE_ONE_TO_ONE>
[[nodiscard]]
Mat<4, 4, Type, St> mat_perspective_right_handed_horizontal_fov(const float horizontal_fov,
const float aspect_ratio, const float near,
const float far) noexcept
{
const float inv_tan_half_hfov = 1.f / std::tan(angles::degrees_to_radians(horizontal_fov) / 2.f);
const float x_axis = inv_tan_half_hfov;
const float y_axis = inv_tan_half_hfov * aspect_ratio;
if constexpr (DepthRange == NDCDepthRange::ZERO_TO_ONE)
return {{x_axis, 0.f, 0.f, 0.f},
{0.f, y_axis, 0.f, 0.f},
{0.f, 0.f, -far / (far - near), -(near * far) / (far - near)},
{0.f, 0.f, -1.f, 0.f}};
else if constexpr (DepthRange == NDCDepthRange::NEGATIVE_ONE_TO_ONE)
return {{x_axis, 0.f, 0.f, 0.f},
{0.f, y_axis, 0.f, 0.f},
{0.f, 0.f, -(far + near) / (far - near), -(2.f * near * far) / (far - near)},
{0.f, 0.f, -1.f, 0.f}};
else
std::unreachable();
}
template<class Type = float, MatStoreType St = MatStoreType::ROW_MAJOR,
NDCDepthRange DepthRange = NDCDepthRange::NEGATIVE_ONE_TO_ONE>
[[nodiscard]]