shockwave.h

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#ifndef SHOCKWAVE_H
#define SHOCKWAVE_H
 
#include "gl_common.h"
#include <cglm/types.h>
#include <stdbool.h>
 
typedef struct Shader Shader;
 
enum { SHOCKWAVE_MAX_ACTIVE = 16 };
 
static const float SHOCKWAVE_DURATION = 1.2F * 3.0F;
 
static const float SHOCKWAVE_MAX_RADIUS = 6.0F;
 
static const float SHOCKWAVE_MIN_VELOCITY = 0.05F;
 
static const float SHOCKWAVE_HDR_INTENSITY = 4.0F;
 
typedef struct {
    vec3 position;    
    float start_time; 
    vec3 color;       
    float intensity;  
} ShockwaveEvent;
 
typedef struct {
    ShockwaveEvent events[SHOCKWAVE_MAX_ACTIVE]; 
    int count; 
    Shader* shader; 
    GLuint vao;     
    GLuint vbo;     
    /* Grab pass: copy of scene color before shockwave draw so the
     * fragment shader can read scene pixels without read/write hazard. */
    GLuint grab_tex;        
    int grab_width;         
    int grab_height;        
    GLuint scene_color_tex; 
} ShockwaveRenderer;
 
bool shockwave_renderer_init(ShockwaveRenderer* renderer);
 
void shockwave_renderer_cleanup(ShockwaveRenderer* renderer);
 
void shockwave_emit(ShockwaveRenderer* renderer, const vec3 position,
                    const vec3 color, float velocity, float sim_time);
 
void shockwave_update(ShockwaveRenderer* renderer, float sim_time);
 
void shockwave_draw(const ShockwaveRenderer* renderer, mat4 view, mat4 proj,
                    vec3 camera_pos, float sim_time, int screen_w,
                    int screen_h);
 
#endif /* SHOCKWAVE_H */