improvements to show a bullet's explosion upon ttl consumption.

implemented a vfx subsystem to handle localized, async animations.

1 files changed, 69 insertions, 0 deletions

diff --git a/vfx.c b/vfx.c
new file mode 100644
index 0000000..69f292f
--- /dev/null
+++ b/vfx.c
@@ -0,0 +1,69 @@
+#include <u.h>
+#include <libc.h>
+#include <ip.h>
+#include <mp.h>
+#include <libsec.h>
+#include <thread.h>
+#include <draw.h>
+#include <geometry.h>
+#include "dat.h"
+#include "fns.h"
+
+static void
+vfx_step(Vfx *v, ulong Δt)
+{
+	if(v->times == 0 && v->a->curframe == 0){
+		delvfx(v);
+		return;
+	}
+
+	v->a->step(v->a, Δt);
+
+	if(v->times > 0 && v->a->curframe == v->a->nframes-1)
+		v->times--;
+}
+
+static void
+vfx_draw(Vfx *v, Image *dst)
+{
+	v->a->draw(v->a, dst, v->p);
+}
+
+Vfx *
+newvfx(Sprite *spr, Point dp, int repeat)
+{
+	Vfx *v;
+
+	v = emalloc(sizeof(Vfx));
+	v->a = spr;
+	v->p = dp;
+	v->times = repeat;
+	v->step = vfx_step;
+	v->draw = vfx_draw;
+
+	return v;
+}
+
+void
+delvfx(Vfx *v)
+{
+	v->next->prev = v->prev;
+	v->prev->next = v->next;
+	delsprite(v->a);
+	free(v);
+}
+
+void
+addvfx(Vfx *v, Vfx *nv)
+{
+	nv->prev = v->prev;
+	nv->next = v;
+	v->prev->next = nv;
+	v->prev = nv;
+}
+
+void
+initvfx(Vfx *v)
+{
+	v->next = v->prev = v;
+}