gallium/util: added util_unreference_framebuffer_state()

diff --git a/src/gallium/auxiliary/util/u_surface.c b/src/gallium/auxiliary/util/u_surface.c
index daaa275ef25bde83a0515d0b90387bb273563da4..cfdf7ab8f8a9fb6ea3213d460bac93fa87ee04bd 100644 (file)
--- a/src/gallium/auxiliary/util/u_surface.c
+++ b/src/gallium/auxiliary/util/u_surface.c
@@ -166,3 +166,19 @@ util_copy_framebuffer_state(struct pipe_framebuffer_state *dst,
 
    pipe_surface_reference(&dst->zsbuf, src->zsbuf);
 }
+
+
+void
+util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb)
+{
+   unsigned i;
+
+   for (i = 0; i < fb->nr_cbufs; i++) {
+      pipe_surface_reference(&fb->cbufs[i], NULL);
+   }
+
+   pipe_surface_reference(&fb->zsbuf, NULL);
+
+   fb->width = fb->height = 0;
+   fb->nr_cbufs = 0;
+}