shithub: libgraphics

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scene: add a way to remove entities and fix the clearscene routine.

--- a/graphics.h

+++ b/graphics.h

@@ -128,6 +128,7 @@

 	ulong nents;

 	void (*addent)(Scene*, Entity*);

+	void (*delent)(Scene*, Entity*);

 };

 /* shader params */

--- a/scene.c

+++ b/scene.c

@@ -165,6 +165,15 @@

 	s->nents++;

 }

+static void

+scene_delent(Scene *s, Entity *e)

+{

+	e->prev->next = e->next;

+	e->next->prev = e->prev;

+	e->prev = e->next = nil;

+	s->nents--;

+}

+

 Scene *

 newscene(char *name)

 {

@@ -175,6 +184,7 @@

 	s->ents.prev = s->ents.next = &s->ents;

 	s->nents = 0;

 	s->addent = scene_addent;

+	s->delent = scene_delent;

 	return s;

 }

@@ -194,7 +204,7 @@

 	Entity *e;

 	for(e = s->ents.next; e != &s->ents; e = e->next){

+		s->delent(s, e);

 		delentity(e);

-		s->nents--;

 	}

 }