sh_math.h

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#ifndef SH_MATH_H
#define SH_MATH_H
 
#include <cglm/cglm.h>
 
/* Ramamoorthi 9 Coefficients for Irradiance Environment Maps */
/* L00, L1-1, L10, L11, L2-2, L2-1, L20, L21, L22 */
/* We use vec4 to align to std430 (16 bytes per coefficient) */
/* The 4th component is padding (or unused) */
typedef struct {
    vec4 coeffs[9];
} SH9;
 
void sh_zero(SH9* sh_ptr);
 
void sh_project_directional(const vec3 dir, const vec3 color, SH9* out_sh);
 
void sh_eval_irradiance(const vec3 normal, const SH9* sh_ptr, vec3 out_color);
 
#endif /* SH_MATH_H */