diff options
Diffstat (limited to 'gfx/lightDirection.cpp')
| -rw-r--r-- | gfx/lightDirection.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gfx/lightDirection.cpp b/gfx/lightDirection.cpp new file mode 100644 index 0000000..5198bdf --- /dev/null +++ b/gfx/lightDirection.cpp @@ -0,0 +1,25 @@ +#include "lightDirection.h" +#include "maths.h" + +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 - 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} +{ +} |