shithub: libgraphics

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viewport: add a way to access front and back buffers.

--- a/graphics.h

+++ b/graphics.h

@@ -216,6 +216,7 @@

 	void (*draw)(Viewport*, Image*);

 	void (*memdraw)(Viewport*, Memimage*);

 	Framebuf *(*getfb)(Viewport*);

+	Framebuf *(*getbb)(Viewport*);

 };

 struct Camera

--- a/render.c

+++ b/render.c

@@ -527,7 +527,7 @@

 			if(ent != nil && ent != &sc->ents){

 				params = emalloc(sizeof *params);

 				memset(params, 0, sizeof *params);

-				params->fb = job->v->getfb(job->v);

+				params->fb = job->v->getbb(job->v);

 				params->id = job->lastid++;

 				params->frag = rgb(DBlack);

 				params->donec = donec;

--- a/viewport.c

+++ b/viewport.c

@@ -23,9 +23,15 @@

 static Framebuf *

 viewport_getfb(Viewport *v)

 {

-	return v->fbctl->fb[v->fbctl->idx^1];	/* address the back buffer */

+	return v->fbctl->fb[v->fbctl->idx];	/* front buffer */

 }

+static Framebuf *

+viewport_getbb(Viewport *v)

+{

+	return v->fbctl->fb[v->fbctl->idx^1];	/* back buffer */

+}

+

 Viewport *

 mkviewport(Rectangle r)

 {

@@ -39,6 +45,7 @@

 	v->draw = viewport_draw;

 	v->memdraw = viewport_memdraw;

 	v->getfb = viewport_getfb;

+	v->getbb = viewport_getbb;

 	return v;

 }