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-rw-r--r--modules/sparkler/xplode.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/modules/sparkler/xplode.c b/modules/sparkler/xplode.c
new file mode 100644
index 0000000..24a436e
--- /dev/null
+++ b/modules/sparkler/xplode.c
@@ -0,0 +1,82 @@
+#include <stdlib.h>
+
+#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,
+ };
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