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authorVito Caputo <vcaputo@gnugeneration.com>2017-01-18 17:14:52 -0800
committerVito Caputo <vcaputo@gnugeneration.com>2017-01-18 17:31:44 -0800
commit524db0cf19648e3c7c78d3e73103b7a0bdcd6bfc (patch)
tree6fd682629904a210927797c92d956c208666b03a /src/modules/sparkler/rocket.c
parentee2073d4e411555aba878277131b56f7eb562c84 (diff)
*: move source into src/ subdir
Restoring some organizational sanity since adopting autotools.
Diffstat (limited to 'src/modules/sparkler/rocket.c')
-rw-r--r--src/modules/sparkler/rocket.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/src/modules/sparkler/rocket.c b/src/modules/sparkler/rocket.c
new file mode 100644
index 0000000..6b9dc5e
--- /dev/null
+++ b/src/modules/sparkler/rocket.c
@@ -0,0 +1,144 @@
+#include <stdlib.h>
+
+#include "draw.h"
+#include "particle.h"
+#include "particles.h"
+
+/* a "rocket" particle type */
+#define ROCKET_MAX_DECAY_RATE 20
+#define ROCKET_MIN_DECAY_RATE 2
+#define ROCKET_MAX_LIFETIME 500
+#define ROCKET_MIN_LIFETIME 300
+#define ROCKETS_MAX 20
+#define ROCKETS_XPLODE_MIN_SIZE 2000
+#define ROCKETS_XPLODE_MAX_SIZE 8000
+
+extern particle_ops_t burst_ops;
+extern particle_ops_t spark_ops;
+extern particle_ops_t xplode_ops;
+
+static unsigned rockets_cnt;
+
+typedef struct rocket_ctxt_t {
+ int decay_rate;
+ int longevity;
+ v3f_t wander;
+ float last_velocity; /* cache velocity to sense violent accelerations and explode when they happen */
+} rocket_ctxt_t;
+
+
+static int rocket_init(particles_t *particles, particle_t *p)
+{
+ rocket_ctxt_t *ctxt = p->ctxt;
+
+ if (rockets_cnt >= ROCKETS_MAX) {
+ return 0;
+ }
+ rockets_cnt++;
+
+ ctxt->decay_rate = rand_within_range(ROCKET_MIN_DECAY_RATE, ROCKET_MAX_DECAY_RATE);
+ ctxt->longevity = rand_within_range(ROCKET_MIN_LIFETIME, ROCKET_MAX_LIFETIME);
+
+ ctxt->wander.x = (float)(rand_within_range(0, 628) - 314) / 10000.0f;
+ ctxt->wander.y = (float)(rand_within_range(0, 628) - 314) / 10000.0f;
+ ctxt->wander.z = (float)(rand_within_range(0, 628) - 314) / 10000.0f;
+ ctxt->wander = v3f_normalize(&ctxt->wander);
+
+ ctxt->last_velocity = p->props->velocity;
+ p->props->drag = 0.4;
+ p->props->mass = 0.8;
+
+ return 1;
+}
+
+
+static particle_status_t rocket_sim(particles_t *particles, particle_t *p)
+{
+ rocket_ctxt_t *ctxt = p->ctxt;
+ int i, n_sparks;
+
+ if (!ctxt->longevity ||
+ (ctxt->longevity -= ctxt->decay_rate) <= 0 ||
+ p->props->velocity - ctxt->last_velocity > p->props->velocity * .05) { /* explode if accelerated too hard (burst) */
+ int n_xplode;
+ /* on death we explode */
+
+ ctxt->longevity = 0;
+
+ /* add a burst shockwave particle at our location
+ * TODO: need way to supply particle-type-specific parameters at spawn (burst size should derive from n_xplode)
+ */
+ particles_spawn_particle(particles, p, NULL, &burst_ops);
+
+ /* add a bunch of new explosion particles */
+ /* TODO: also particle-type-specific parameters, colors! rocket bursts should be able to vary the color. */
+ n_xplode = rand_within_range(ROCKETS_XPLODE_MIN_SIZE, ROCKETS_XPLODE_MAX_SIZE);
+ for (i = 0; i < n_xplode; i++) {
+ particle_props_t props = *p->props;
+ particle_ops_t *ops = &xplode_ops;
+
+ props.direction.x = ((float)(rand_within_range(0, 314159 * 2) - 314159) / 100000.0);
+ props.direction.y = ((float)(rand_within_range(0, 314159 * 2) - 314159) / 100000.0);
+ props.direction.z = ((float)(rand_within_range(0, 314159 * 2) - 314159) / 100000.0);
+ props.direction = v3f_normalize(&props.direction);
+
+ //props->velocity = ((float)rand_within_range(100, 200) / 100000.0);
+ props.velocity = ((float)rand_within_range(100, 300) / 100000.0);
+ particles_spawn_particle(particles, p, &props, ops);
+ }
+ return PARTICLE_DEAD;
+ }
+
+#if 1
+ /* FIXME: this isn't behaving as intended */
+ p->props->direction = v3f_add(&p->props->direction, &ctxt->wander);
+ p->props->direction = v3f_normalize(&p->props->direction);
+#endif
+ p->props->velocity += .00003;
+
+ /* spray some sparks behind the rocket */
+ n_sparks = rand_within_range(10, 40);
+ for (i = 0; i < n_sparks; i++) {
+ particle_props_t props = *p->props;
+
+ props.direction = v3f_negate(&props.direction);
+
+ props.direction.x += (float)(rand_within_range(0, 40) - 20) / 100.0;
+ props.direction.y += (float)(rand_within_range(0, 40) - 20) / 100.0;
+ props.direction.z += (float)(rand_within_range(0, 40) - 20) / 100.0;
+ props.direction = v3f_normalize(&props.direction);
+
+ props.velocity = (float)rand_within_range(10, 50) / 100000.0;
+ particles_spawn_particle(particles, p, &props, &spark_ops);
+ }
+
+ ctxt->last_velocity = p->props->velocity;
+
+ return PARTICLE_ALIVE;
+}
+
+
+static void rocket_draw(particles_t *particles, particle_t *p, int x, int y, fb_fragment_t *f)
+{
+ rocket_ctxt_t *ctxt = p->ctxt;
+
+ if (!draw_pixel(f, x, y, 0xff0000)) {
+ /* kill off parts that wander off screen */
+ ctxt->longevity = 0;
+ }
+}
+
+
+static void rocket_cleanup(particles_t *particles, particle_t *p)
+{
+ rockets_cnt--;
+}
+
+
+particle_ops_t rocket_ops = {
+ .context_size = sizeof(rocket_ctxt_t),
+ .sim = rocket_sim,
+ .init = rocket_init,
+ .draw = rocket_draw,
+ .cleanup = rocket_cleanup,
+ };
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