Packed font rendering

source/engine/particle.c

@@ -0,0 +1,55 @@
+#include "particle.h"
+
+struct emitter make_emitter()
+{
+    struct emitter e = { 0 };
+    return e;
+}
+
+struct emitter set_emitter(struct emitter e)
+{
+    arrsetlen(e.particles, e.max);
+
+    e.first = &e.particles[0];
+
+    for (int i = 0; i < arrlen(e.particles)-1; i++) {
+        e.particles[i].next = &e.particles[i+1];
+    }
+}
+
+void free_emitter(struct emitter e)
+{
+    arrfree(e.particles);
+}
+
+void start_emitter(struct emitter e)
+{
+
+}
+
+void pause_emitter(struct emitter e)
+{
+
+}
+
+void stop_emitter(struct emitter e)
+{
+
+}
+
+void emitter_step(struct emitter e, double dt)
+{
+    for (int i = 0; i < arrlen(e.particles); i++) {
+        if (e.particles[i].life <= 0)
+            continue;
+
+        e.particles[i].pos = cpvadd(e.particles[i].pos, cpvmult(e.particles[i].v, dt));
+        e.particles[i].angle += e.particles[i].av * dt;
+        e.particles[i].life -= dt;
+
+        if (e.particles[i].life <= 0) {
+            e.particles[i].next = e.first;
+            e.first = &e.particles[i];
+        }
+    }
+}