billboard_sorter.h

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#ifndef BILLBOARD_SORTER_H
#define BILLBOARD_SORTER_H
 
#include "gl_common.h"
#include "scene_config.h"
#include "sphere_types.h"
#include <cglm/cglm.h>
 
typedef struct {
    int original_index; 
    float depth;        
} BillboardSortEntry;
 
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;         
    BillboardSortEntry* entries;     
    BillboardSortEntry* entries_aux; 
    SphereInstance* temp_instances;  
    int ssbo_capacity; 
    int cpu_capacity;  
    int min_capacity;  
} BillboardSorter;
 
void billboard_sorter_init(BillboardSorter* sorter, int initial_capacity);
 
void billboard_sorter_cleanup(BillboardSorter* sorter);
 
GLuint billboard_sorter_sort_gpu(BillboardSorter* sorter,
                                 const SphereInstance* instances, int count,
                                 const vec3 camera_pos);
 
GLuint billboard_sorter_sort_cpu(BillboardSorter* sorter,
                                 const SphereInstance* instances, int count,
                                 const vec3 camera_pos);
 
GLuint billboard_sorter_sort_cpu_radix(BillboardSorter* sorter,
                                       const SphereInstance* instances,
                                       int count, const vec3 camera_pos);
 
GLuint billboard_sorter_sort(BillboardSorter* sorter,
                             const SphereInstance* instances, int count,
                             const vec3 camera_pos, SortingMode mode);
 
#endif /* BILLBOARD_SORTER_H */