pex-renderer/shaders/chunks/light-point.glsl.js

Physically Based Renderer for Pex

module.exports = /* glsl */ `
#if NUM_POINT_LIGHTS > 0

struct PointLight {
  vec3 position;
  vec4 color;
  float range;
  bool castShadows;
};

uniform PointLight uPointLights[NUM_POINT_LIGHTS];
uniform samplerCube uPointLightShadowMaps[NUM_POINT_LIGHTS];

void EvaluatePointLight(inout PBRData data, PointLight light, samplerCube shadowMap) {
  vec3 posToLight = light.position - data.positionWorld;

  float illuminated = bool(light.castShadows) ? getPunctualShadow(shadowMap, posToLight) : 1.0;

  if (illuminated > 0.0) {
    float invSqrFalloff = 1.0 / pow(light.range, 2.0);
    float attenuation = getDistanceAttenuation(posToLight, invSqrFalloff);

    Light l;
    l.l = normalize(posToLight);
    l.color = light.color;
    l.attenuation = attenuation;
    getSurfaceShading(data, l, illuminated);
  }
}
#endif
`