sphere_sorting.h

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#ifndef SPHERE_SORTING_H
#define SPHERE_SORTING_H
 
#include "instanced_rendering.h"
#include <cglm/cglm.h>
 
typedef struct {
    int original_index; 
    float depth;        
} SphereSortEntry;
 
typedef struct {
    GLuint compute_program;      
    GLuint instance_ssbo;        
    GLuint index_ssbo;           
    GLuint sorted_instance_ssbo; 
    /* Cached uniform locations (resolved once at init). */
    GLint loc_stage;     
    GLint loc_count;     
    GLint loc_count_pot; 
    GLint loc_cam;       
    GLint loc_j;         
    GLint loc_k;         
    SphereSortEntry* entries;       
    SphereSortEntry* entries_aux;   
    SphereInstance* temp_instances; 
    int ssbo_capacity; 
    int cpu_capacity;  
    int min_capacity;  
} SphereSorter;
 
void sphere_sorter_init(SphereSorter* sorter, int initial_capacity);
 
void sphere_sorter_cleanup(SphereSorter* sorter);
 
GLuint sphere_sorter_sort_gpu(SphereSorter* sorter,
                              const SphereInstance* instances, int count,
                              const vec3 camera_pos);
 
GLuint sphere_sorter_sort_cpu(SphereSorter* sorter,
                              const SphereInstance* instances, int count,
                              const vec3 camera_pos);
 
GLuint sphere_sorter_sort_cpu_radix(SphereSorter* sorter,
                                    const SphereInstance* instances, int count,
                                    const vec3 camera_pos);
 
#endif /* SPHERE_SORTING_H */