python: Surface clears.

src/gallium/state_trackers/python/gallium.i

@@ -367,7 +367,7 @@ error1:
       $self->pipe->surface_fill($self->pipe, dst, x, y, width, height, value);
    }
 
-   void clear(struct pipe_surface *surface, unsigned value) {
+   void surface_clear(struct pipe_surface *surface, unsigned value = 0) {
       $self->pipe->clear($self->pipe, surface, value);
    }
 

src/gallium/state_trackers/python/samples/simple.py

@@ -142,6 +142,8 @@ def test(dev):
     #fs.dump()
     ctx.set_fragment_shader(fs)
 
+    ctx.surface_clear(surface, 0x00ff0000)
+
     if 0:
         nverts = 4
         nattrs = 1