luft/render/lighting.lisp

system luft/renderer · 5 definitions · on GitHub

in-package#:luft.render

Lighting has identity at the frame boundary. The shader sees only the dense lanes packed from this object once per frame; fragments do not carry objects or dispatch through the lighting vocabulary.

defparameter+shadow-map-size+1024"Resolution of LUFT's single sun-shadow map."

defclasslight

name:initarg:name:readerlight-name

sun-direction:initarg:sun-direction:readerlight-sun-direction

sun-color:initarg:sun-color:readerlight-sun-color

sky-color:initarg:sky-color:readerlight-sky-color

ground-color:initarg:ground-color:readerlight-ground-color

shadow-half-extent:initarg:shadow-half-extent:readerlight-shadow-half-extent

shadow-depth-radius:initarg:shadow-depth-radius:readerlight-shadow-depth-radius

shadow-base-bias:initarg:shadow-base-bias:readerlight-shadow-base-bias

shadow-filter-radius:initarg:shadow-filter-radius:readerlight-shadow-filter-radius

:documentation

One inspectable environment light, packed into raw per-frame GPU lanes.

defvar*light*nil

setf*light*

ensure-semantic-instance*light*'light:name:late-afternoon:sun-direction

vec3:vec3-normalize

vec3:make-vec3-0.580.360.73

:sun-color

2.451.300.480.92

:sky-color

0.330.521.021.0

:ground-color

0.500.240.321.0

:shadow-half-extent96.0:shadow-depth-radius160.0:shadow-base-bias0.00075:shadow-filter-radius5.0

defunlight-shadow-rows

lightcenter

Return a texel-stable orthographic world-to-shadow transform.

The first two rows map the square light plane to clip [-1,1]. The third maps the signed light depth around center to [0,1]. center is snapped in the light plane so camera translation cannot slide a shadow edge by a fraction of a texel.

let*

sun

light-sun-directionlight

forward

vec3:vec3-scalesun-1.0

world-up

vec3:make-vec30.00.01.0

right

vec3:vec3-normalize

vec3:vec3-crossworld-upforward

vec3:vec3-crossforwardright

extent