1 files changed, 113 insertions, 0 deletions
diff --git a/src/modules/sparkler/simple.c b/src/modules/sparkler/simple.c
new file mode 100644
index 0000000..e453e46
--- /dev/null
+++ b/src/modules/sparkler/simple.c
@@ -0,0 +1,113 @@
+#include <stdlib.h>
+
+#include "draw.h"
+#include "particle.h"
+#include "particles.h"
+
+
+/* a "simple" particle type */
+#define SIMPLE_MAX_DECAY_RATE	20
+#define SIMPLE_MIN_DECAY_RATE	2
+#define SIMPLE_MAX_LIFETIME	110
+#define SIMPLE_MIN_LIFETIME	30
+#define SIMPLE_MAX_SPAWN	15
+#define SIMPLE_MIN_SPAWN	2
+
+extern particle_ops_t rocket_ops;
+
+typedef struct _simple_ctxt_t {
+	int		decay_rate;
+	int		longevity;
+	int		lifetime;
+} simple_ctxt_t;
+
+
+static int simple_init(particles_t *particles, particle_t *p)
+{
+	simple_ctxt_t	*ctxt = p->ctxt;
+
+	ctxt->decay_rate = rand_within_range(SIMPLE_MIN_DECAY_RATE, SIMPLE_MAX_DECAY_RATE);
+	ctxt->lifetime = ctxt->longevity = rand_within_range(SIMPLE_MIN_LIFETIME, SIMPLE_MAX_LIFETIME);
+
+	if (!p->props->of_use) {
+		/* everything starts from the bottom center */
+		p->props->position.x = 0;
+		p->props->position.y = 0;
+		p->props->position.z = 0;
+
+		/* TODO: direction random-ish within the range of a narrow upward facing cone */
+		p->props->direction.x = (float)(rand_within_range(0, 6) - 3) * .1f;
+		p->props->direction.y = 1.0f + (float)(rand_within_range(0, 6) - 3) * .1f;
+		p->props->direction.z = (float)(rand_within_range(0, 6) - 3) * .1f;
+		p->props->direction = v3f_normalize(&p->props->direction);
+
+		p->props->velocity = (float)rand_within_range(300, 800) / 100000.0;
+
+		p->props->drag = 0.03;
+		p->props->mass = 0.3;
+		p->props->of_use = 1;
+	} /* else { we've been given properties, manipulate them or run with them? } */
+
+	return 1;
+}
+
+
+static particle_status_t simple_sim(particles_t *particles, particle_t *p)
+{
+	simple_ctxt_t	*ctxt = p->ctxt;
+
+	/* a particle is free to manipulate its children list when aging, but not itself or its siblings */
+	/* return PARTICLE_DEAD to remove kill yourself, do not age children here, the age pass will recurse
+	 * into children and age them independently _after_ their parents have been aged
+	 */
+	if (!ctxt->longevity || (ctxt->longevity -= ctxt->decay_rate) <= 0) {
+		ctxt->longevity = 0;
+		return PARTICLE_DEAD;
+	}
+
+	/* create particles inheriting our type based on some silly conditions, with some tweaks to their direction */
+	if (ctxt->longevity == 42 || (ctxt->longevity > 500 && !(ctxt->longevity % 50))) {
+		int	i, num = rand_within_range(SIMPLE_MIN_SPAWN, SIMPLE_MAX_SPAWN);
+
+		for (i = 0; i < num; i++) {
+			particle_props_t	props = *p->props;
+			particle_ops_t		*ops = INHERIT_OPS;
+
+			if (i == (SIMPLE_MAX_SPAWN - 2)) {
+				ops = &rocket_ops;
+				props.velocity = (float)rand_within_range(60, 100) / 1000000.0;
+			} else {
+				props.velocity = (float)rand_within_range(30, 100) / 10000.0;
+			}
+
+			props.direction.x += (float)(rand_within_range(0, 315 * 2) - 315) / 100.0;
+			props.direction.y += (float)(rand_within_range(0, 315 * 2) - 315) / 100.0;
+			props.direction.z += (float)(rand_within_range(0, 315 * 2) - 315) / 100.0;
+			props.direction = v3f_normalize(&props.direction);
+
+			particles_spawn_particle(particles, p, &props, ops); // XXX
+		}
+	}
+
+	return PARTICLE_ALIVE;
+}
+
+
+static void simple_draw(particles_t *particles, particle_t *p, int x, int y, fb_fragment_t *f)
+{
+	simple_ctxt_t	*ctxt = p->ctxt;
+
+	if (!draw_pixel(f, x, y, makergb(0xff, 0xff, 0xff, ((float)ctxt->longevity / ctxt->lifetime)))) {
+		/* immediately kill off stars that wander off screen */
+		ctxt->longevity = 0;
+	}
+}
+
+
+particle_ops_t	simple_ops = {
+			.context_size = sizeof(simple_ctxt_t),
+			.sim = simple_sim,
+			.init = simple_init,
+			.draw = simple_draw,
+			.cleanup = NULL,
+		};