Nouveau: nv{10,20} set_primitive API fix

Also changes nvgl_primitive() to return zero, i.e. error, on unknown
primitive.

Signed-off-by: Pekka Paalanen <pq@iki.fi>

src/gallium/drivers/nouveau/nouveau_gldefs.h

@@ -189,7 +189,7 @@ nvgl_primitive(unsigned prim) {
 	case PIPE_PRIM_POLYGON:
 		return 0x000a;
 	default:
-		return 0x0001;
+		return 0;
 	}
 }
 

src/gallium/drivers/nv10/nv10_prim_vbuf.c

@@ -121,12 +121,17 @@ nv10_vbuf_render_allocate_vertices( struct vbuf_render *render,
 }
 
 
-static void 
+static boolean
 nv10_vbuf_render_set_primitive( struct vbuf_render *render, 
 		unsigned prim )
 {
 	struct nv10_vbuf_render *nv10_render = nv10_vbuf_render(render);
-	nv10_render->hwprim = prim + 1;
+	unsigned hwp = nvgl_primitive(prim);
+	if (hwp == 0)
+		return FALSE;
+
+	nv10_render->hwprim = hwp;
+	return TRUE;
 }
 
 

src/gallium/drivers/nv20/nv20_prim_vbuf.c

@@ -146,12 +146,17 @@ nv20_vbuf_render_allocate_vertices( struct vbuf_render *render,
 	return buf;
 }
 
-static void
+static boolean
 nv20_vbuf_render_set_primitive( struct vbuf_render *render, 
 		unsigned prim )
 {
 	struct nv20_vbuf_render *nv20_render = nv20_vbuf_render(render);
-	nv20_render->hwprim = nvgl_primitive(prim);
+	unsigned hwp = nvgl_primitive(prim);
+	if (hwp == 0)
+		return FALSE;
+
+	nv20_render->hwprim = hwp;
+	return TRUE;
 }
 
 static uint32_t