#ifndef SKY_LIGHT_H
#define SKY_LIGHT_H

#include "Algorithm/BSDF.h"
#include "Algorithm/RayIntersection.h"
#include "Light.h"

#include <string.h>

typedef struct
{
    vec3s color;
    float intensity;
} constant_sky_data_t;

typedef struct
{
    uint32_t width;
    uint32_t height;
    texture_entity_t texture;
    float intensity;
    float total_weight;
    vec3s* cdf_cache; // Precomputed cache for sampling, xy for texture coordinates, z for PDF
} hdr_sky_data_t;

sky_light_t sky_create_constant_sky(const constant_sky_data_t* data);
path_output evaluate_bsdf_const_sky(const void* data, const light_shading_context_t* context, vec3s throughput, uint32_t sample_index);

sky_light_t sky_create_hdr_sky(const texture_collection_t* textures, texture_entity_t hdri_entity, float intensity);
path_output evaluate_bsdf_hdr_sky(const void* data, const light_shading_context_t* context, vec3s throughput, uint32_t sample_index);
void hdr_sky_free(hdr_sky_data_t* data);

#endif // SKY_LIGHT_H