shithub: libgraphics

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wipe the back buffer after rendering.

this avoids having to hold two full a-buffers after
shooting the camera.

--- a/camera.c

+++ b/camera.c

@@ -252,7 +252,6 @@

 	job->shaders = s;

 	job->donec = chancreate(sizeof(void*), 0);

-	fbctl->reset(fbctl);

 	t0 = nanosec();

 	sendp(c->rctl->jobq, job);

 	recvp(job->donec);

@@ -278,6 +277,7 @@

 	}

 	t1 = nanosec();

 	fbctl->swap(fbctl);

+	fbctl->reset(fbctl);

 	updatestats(c, t1-t0);

 	printtimings(job);

--- a/fb.c

+++ b/fb.c

@@ -590,6 +590,7 @@

 	fc->fetchraster = framebufctl_fetchraster;

 	fc->getfb = framebufctl_getfb;

 	fc->getbb = framebufctl_getbb;

+	fc->reset(fc);

 	return fc;

 }