#define MAX_AREA_LIGHTS 16

// note this struct must exactly match the memory layout of the
// struct SLightSourceShader in the source code. If you make changes here you need
// to adjust the struct SLightSourceShader as well
struct AreaLight
{
    vec4  position;
    vec4  direction;              // Specifies the light direction in world coordinates.
    vec4  up;
    vec4  right;
    vec4  diffuse;
    vec4  ambient;
    vec4  specular;
    float spotExponent;           // Specifies the intensity distribution of the light.
    float spotCutoff;             // Specifies the maximum spread angle of the light.
    float constantAttenuation;    // Specifies the constant light attenuation factor.
    float linearAttenuation;      // Specifies the linear light attenuation factor.
    float quadraticAttenuation;   // Specifies the quadratic light attenuation factor.
    float range;                  // Specifies the maximum distance of the light influence
    float width;                  // Specifies the width of the area light surface.
    float height;                 // Specifies the height of the area light surface;
    vec4  shadowControls;
    mat4  shadowView;
    int   shadowIdx;
};

layout (std140) uniform cbBufferAreaLights
{
    int uNumAreaLights;
    AreaLight arealights[MAX_AREA_LIGHTS];
};