billboard_renderer.h

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#ifndef BILLBOARD_RENDERER_H
#define BILLBOARD_RENDERER_H
 
#include "billboard_sorter.h"
#include "gl_common.h"
#include "scene_config.h"
#include "sphere_types.h"
#include <cglm/cglm.h>
 
typedef struct {
    mat4 projection;
    mat4 view;
    mat4 previous_view_proj;
    vec3 camera_pos;
    int32_t pbr_debug_mode;
    float screen_size[2];
    vec3 probe_grid_min;
    vec3 probe_grid_max;
    int32_t probe_grid_dim[3];
    int32_t gi_mode;
    bool specular_aa_enabled;
    int32_t aa_mode;
 
    /* Configuration flags for drawing */
    bool wireframe;
    SortingMode sorting_mode;
 
    /* Active instances to sort and render */
    const SphereInstance* instances;
    int instance_count;
} BillboardRenderParams;
 
typedef struct {
    GLuint
        vao; 
    GLuint instance_vbo; 
    int instance_count; 
    int capacity;       
    GLuint vao_wire_quad; 
    GLuint vao_wire_box;  
    /* Nested BillboardSorter */
    BillboardSorter sorter;
 
    /* Cached uniform locations for debug_line shader to prevent per-frame
     * lookups */
    GLuint cached_debug_program;
    GLint loc_proj;
    GLint loc_view;
    GLint loc_stippled;
    GLint loc_billboard_mode;
    GLint loc_use_instance_col;
    GLint loc_color;
} BillboardRenderer;
 
void billboard_renderer_init(BillboardRenderer* renderer, int initial_capacity);
 
void billboard_renderer_prepare(BillboardRenderer* renderer, GLuint quad_vbo,
                                GLuint wire_quad_vbo, GLuint wire_cube_vbo);
 
void billboard_renderer_draw(BillboardRenderer* renderer,
                             const BillboardRenderParams* params,
                             GLuint pbr_billboard_shader,
                             GLuint debug_line_shader, void* billboard_ubo_ptr);
 
void billboard_renderer_cleanup(BillboardRenderer* renderer);
 
#endif /* BILLBOARD_RENDERER_H */