pxl8/src/pxl8_vfx.h

#pragma once

#include "pxl8_gfx.h"
#include "pxl8_types.h"

typedef struct pxl8_particle {
    f32 x, y, z;
    f32 vx, vy, vz;
    f32 ax, ay, az;
    f32 life;
    f32 max_life;
    u32 color;
    u32 start_color;
    u32 end_color;
    f32 size;
    f32 angle;
    f32 spin;
    u8 flags;
} pxl8_particle;

typedef struct pxl8_particle_system {
    pxl8_particle* particles;
    u32 count;
    u32 max_count;
    u32 alive_count;
    f32 spawn_rate;
    f32 spawn_timer;
    f32 x, y;
    f32 spread_x, spread_y;
    f32 gravity_x, gravity_y;
    f32 drag;
    f32 turbulence;
    void (*spawn_fn)(pxl8_particle* p, void* userdata);
    void (*update_fn)(pxl8_particle* p, f32 dt, void* userdata);
    void (*render_fn)(pxl8_gfx_ctx* ctx, pxl8_particle* p, void* userdata);
    void* userdata;
} pxl8_particle_system;

typedef struct pxl8_raster_bar {
    f32 base_y;
    f32 amplitude;
    i32 height;
    f32 speed;
    f32 phase;
    u32 color;
    u32 fade_color;
} pxl8_raster_bar;

void pxl8_vfx_particles_clear(pxl8_particle_system* sys);
void pxl8_vfx_particles_emit(pxl8_particle_system* sys, u32 count);
void pxl8_vfx_particles_free(pxl8_particle_system* sys);
void pxl8_vfx_particles_init(pxl8_particle_system* sys, u32 max_count);
void pxl8_vfx_particles_render(pxl8_particle_system* sys, pxl8_gfx_ctx* ctx);
void pxl8_vfx_particles_update(pxl8_particle_system* sys, f32 dt);

void pxl8_vfx_explosion(pxl8_particle_system* sys, i32 x, i32 y, u32 color, f32 force);
void pxl8_vfx_fire(pxl8_particle_system* sys, i32 x, i32 y, i32 width, u8 palette_start);
void pxl8_vfx_rain(pxl8_particle_system* sys, i32 width, f32 wind);
void pxl8_vfx_smoke(pxl8_particle_system* sys, i32 x, i32 y, u8 color);
void pxl8_vfx_snow(pxl8_particle_system* sys, i32 width, f32 wind);
void pxl8_vfx_sparks(pxl8_particle_system* sys, i32 x, i32 y, u32 color);
void pxl8_vfx_starfield(pxl8_particle_system* sys, f32 speed, f32 spread);

void pxl8_vfx_plasma(pxl8_gfx_ctx* ctx, f32 time, f32 scale1, f32 scale2, u8 palette_offset);
void pxl8_vfx_raster_bars(pxl8_gfx_ctx* ctx, pxl8_raster_bar* bars, u32 bar_count, f32 time);
void pxl8_vfx_rotozoom(pxl8_gfx_ctx* ctx, f32 angle, f32 zoom, i32 cx, i32 cy);
void pxl8_vfx_tunnel(pxl8_gfx_ctx* ctx, f32 time, f32 speed, f32 twist);
void pxl8_vfx_water_ripple(pxl8_gfx_ctx* ctx, f32* height_map, i32 drop_x, i32 drop_y, f32 damping);