From 524db0cf19648e3c7c78d3e73103b7a0bdcd6bfc Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Wed, 18 Jan 2017 17:14:52 -0800 Subject: *: move source into src/ subdir Restoring some organizational sanity since adopting autotools. --- src/modules/sparkler/xplode.c | 82 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 src/modules/sparkler/xplode.c (limited to 'src/modules/sparkler/xplode.c') diff --git a/src/modules/sparkler/xplode.c b/src/modules/sparkler/xplode.c new file mode 100644 index 0000000..24a436e --- /dev/null +++ b/src/modules/sparkler/xplode.c @@ -0,0 +1,82 @@ +#include + +#include "draw.h" +#include "particle.h" +#include "particles.h" + +/* a "xplode" particle type, emitted by rockets in large numbers at the end of their lifetime */ +#define XPLODE_MAX_DECAY_RATE 10 +#define XPLODE_MIN_DECAY_RATE 5 +#define XPLODE_MAX_LIFETIME 150 +#define XPLODE_MIN_LIFETIME 5 + +extern particle_ops_t spark_ops; +particle_ops_t xplode_ops; + +typedef struct _xplode_ctxt_t { + int decay_rate; + int longevity; + int lifetime; +} xplode_ctxt_t; + + +static int xplode_init(particles_t *particles, particle_t *p) +{ + xplode_ctxt_t *ctxt = p->ctxt; + + ctxt->decay_rate = rand_within_range(XPLODE_MIN_DECAY_RATE, XPLODE_MAX_DECAY_RATE); + ctxt->lifetime = ctxt->longevity = rand_within_range(XPLODE_MIN_LIFETIME, XPLODE_MAX_LIFETIME); + + p->props->drag = 10.9; + p->props->mass = 0.3; + + return 1; +} + + +static particle_status_t xplode_sim(particles_t *particles, particle_t *p) +{ + xplode_ctxt_t *ctxt = p->ctxt; + + if (!ctxt->longevity || (ctxt->longevity -= ctxt->decay_rate) <= 0) { + ctxt->longevity = 0; + return PARTICLE_DEAD; + } + + /* litter some small sparks behind the explosion particle */ + if (!(ctxt->lifetime % 30)) { + particle_props_t props = *p->props; + + props.velocity = (float)rand_within_range(10, 50) / 10000.0; + particles_spawn_particle(particles, p, &props, &xplode_ops); + } + + return PARTICLE_ALIVE; +} + + +static void xplode_draw(particles_t *particles, particle_t *p, int x, int y, fb_fragment_t *f) +{ + xplode_ctxt_t *ctxt = p->ctxt; + uint32_t color; + + if (ctxt->longevity == ctxt->lifetime) { + color = makergb(0xff, 0xff, 0xa0, 1.0); + } else { + color = makergb(0xff, 0xff, 0x00, ((float)ctxt->longevity / ctxt->lifetime)); + } + + if (!draw_pixel(f, x, y, color)) { + /* offscreen */ + ctxt->longevity = 0; + } +} + + +particle_ops_t xplode_ops = { + .context_size = sizeof(xplode_ctxt_t), + .sim = xplode_sim, + .init = xplode_init, + .draw = xplode_draw, + .cleanup = NULL, + }; -- cgit v1.2.1