diff options
Diffstat (limited to 'gfx')
| -rw-r--r-- | gfx/lightDirection.cpp | 19 | ||||
| -rw-r--r-- | gfx/lightDirection.h | 7 |
2 files changed, 23 insertions, 3 deletions
diff --git a/gfx/lightDirection.cpp b/gfx/lightDirection.cpp index 3932872..5198bdf 100644 --- a/gfx/lightDirection.cpp +++ b/gfx/lightDirection.cpp @@ -1,12 +1,25 @@ #include "lightDirection.h" #include "maths.h" -constexpr auto ASTRONOMICAL_TWILIGHT = 18.0_degrees; +constexpr auto TWILIGHT_START = .0_degrees; +constexpr auto TWILIGHT_END = -18.0_degrees; +constexpr auto TWILIGHT_RANGE = TWILIGHT_START - TWILIGHT_END; + constexpr auto SUN_ANGLUAR_SIZE = 0.5_degrees; +constexpr auto SUN_ANGLUAR_RADIUS = SUN_ANGLUAR_SIZE / 2; +constexpr auto SUN_ELEVATION_REFRACTION_OFFSET = 0.5_degrees; +constexpr auto SUN_ANGLUAR_OFFSET = SUN_ANGLUAR_RADIUS + SUN_ELEVATION_REFRACTION_OFFSET; + +constexpr auto ATMOSPHERE_SCATTER_MIN = .4F; +constexpr auto ATMOSPHERE_SCATTER_MAX = .7F; +constexpr auto ATMOSPHERE_SCATTER_RANGE = ATMOSPHERE_SCATTER_MAX - ATMOSPHERE_SCATTER_MIN; + +constexpr auto NORM = 0.5F; LightDirection::LightDirection(const Direction2D sunPos) : pos {sunPos}, vec {glm::mat3 {rotate_yp(pi + sunPos.x, -sunPos.y)} * north}, - amb {glm::clamp(sunPos.y + ASTRONOMICAL_TWILIGHT, 0.F, 1.F)}, - dir {glm::clamp(sunPos.y + SUN_ANGLUAR_SIZE, 0.F, 1.F)} + amb {glm::clamp((sunPos.y - TWILIGHT_END) / TWILIGHT_RANGE, 0.F, 1.F)}, + dir {(-std::cos(std::clamp((sunPos.y + SUN_ANGLUAR_OFFSET) / SUN_ANGLUAR_SIZE, 0.F, 1.F) * pi) * NORM) + NORM}, + atmosScatter {((half_pi - sunPos.y) / half_pi * ATMOSPHERE_SCATTER_RANGE) + ATMOSPHERE_SCATTER_MIN} { } diff --git a/gfx/lightDirection.h b/gfx/lightDirection.h index 789830b..296f497 100644 --- a/gfx/lightDirection.h +++ b/gfx/lightDirection.h @@ -31,9 +31,16 @@ public: return dir; } + [[nodiscard]] float + atmosphericScattering() const noexcept + { + return atmosScatter; + } + private: Direction2D pos; Direction3D vec; float amb; float dir; + float atmosScatter; }; |