pokeplatinum/lib/spl/include/spl_particle.h

#ifndef SPL_PARTICLE_H
#define SPL_PARTICLE_H

#include <nitro/gx/gxcommon.h>
#include <nitro/types.h>

typedef struct SPLParticle {
    struct SPLParticle *next;
    struct SPLParticle *prev;
    VecFx32 position; // position of the particle, relative to the emitter
    VecFx32 velocity;
    u16 rotation;
    s16 angularVelocity;
    u16 lifeTime;
    u16 age;

    // These two values are essentially 1.0f / lifeTime (or 1.0f / loopTime), represented as an integer
    // They are used to map between age/lifeTime and a [0, 255] range
    // Mainly just to lower the amount of divisions needed in the update functions
    u16 loopTimeFactor;
    u16 lifeTimeFactor;

    u8 texture; // Index of the current texture in the resource

    // A value between 0 and 255 that is added to the life rate of the particle.
    // This is used only for looping particles, so particles spawned at the same time
    // don't have aren't all in sync (animation-wise)
    u8 lifeRateOffset;

    struct {
        u16 baseAlpha : 5;
        u16 animAlpha : 5;
        u16 currentPolygonID : 6;
    } visibility;
    fx32 baseScale;
    fx16 animScale;
    GXRgb color;
    VecFx32 emitterPos;
} SPLParticle;

typedef struct SPLParticleList {
    SPLParticle *first;
    int count;
    SPLParticle *last;
} SPLParticleList;

#endif // SPL_PARTICLE_H