gallium: create helper for swrast+xlib combination

Several targets may want to reuse this code.  It's pretty simple, not
sure if this is really a win.

src/gallium/auxiliary/Makefile

@@ -131,7 +131,8 @@ C_SOURCES = \
 	vl/vl_mpeg12_mc_renderer.c \
 	vl/vl_compositor.c \
 	vl/vl_csc.c \
-	vl/vl_shader_build.c
+	vl/vl_shader_build.c \
+	target-helpers/swrast_xlib.c
 
 GALLIVM_SOURCES = \
         gallivm/lp_bld_alpha.c \

src/gallium/include/state_tracker/xlib_sw_winsys.h

@@ -9,8 +9,9 @@ struct pipe_screen;
 struct pipe_surface;
 
 /* This is what the xlib software winsys expects to find in the
- * "private" field of flush_frontbuffers().  Xlib-based state trackers
- * somehow need to know this.
+ * "private" field of flush_frontbuffers().
+ *
+ * Xlib-based state trackers somehow need to know this.
  */
 struct xlib_drawable {
    Visual *visual;
@@ -18,12 +19,6 @@ struct xlib_drawable {
    Drawable drawable;
 };
 
-/* This is the interface required by the glx/xlib state tracker.  Why
- * is it being defined in this file?
- */
-struct xm_driver {
-   struct pipe_screen *(*create_pipe_screen)( Display *display );
-};
 
 /* This is the public interface to the ws/xlib module.  Why isn't it
  * being defined in that directory?

src/gallium/state_trackers/glx/xlib/xm_api.c

@@ -63,7 +63,7 @@
 #include "pipe/p_screen.h"
 #include "pipe/p_context.h"
 
-#include "xm_winsys.h"
+#include "xm_public.h"
 #include <GL/glx.h>
 
 

src/gallium/state_trackers/glx/xlib/xm_public.h

@@ -29,11 +29,13 @@
 #ifndef XM_WINSYS_H
 #define XM_WINSYS_H
 
-struct pipe_context;
-struct pipe_screen;
-struct pipe_surface;
-struct xlib_drawable;
+struct xm_driver;
 
+/* This is the driver interface required by the glx/xlib state tracker. 
+ */
+struct xm_driver {
+   struct pipe_screen *(*create_pipe_screen)( Display *display );
+};
 
 extern void
 xmesa_set_driver( const struct xm_driver *driver );

src/gallium/targets/libgl-xlib/xlib.c

@@ -30,81 +30,19 @@
  * Authors:
  *   Keith Whitwell
  */
-
-#include "state_tracker/xlib_sw_winsys.h"
-#include "xm_winsys.h"
-#include "util/u_debug.h"
-#include "softpipe/sp_public.h"
-#include "llvmpipe/lp_public.h"
-#include "identity/id_public.h"
-#include "trace/tr_public.h"
-#include "cell/ppu/cell_public.h"
-
+#include "pipe/p_compiler.h"
+#include "target-helpers/swrast_xlib.h"
+#include "xm_public.h"
 
 /* advertise OpenGL support */
 PUBLIC const int st_api_OpenGL = 1;
 
-
-static struct pipe_screen *
-create_screen( struct sw_winsys *winsys )
-{
-#if defined(GALLIUM_CELL)
-   if (!debug_get_bool_option("GALLIUM_NOCELL", FALSE)) 
-      return cell_create_screen( winsys );
-#endif
-
-#if defined(GALLIUM_LLVMPIPE)
-   return llvmpipe_create_screen( winsys );
-#endif
-
-   return softpipe_create_screen( winsys );
-}
-
-
-
-static struct pipe_screen *
-xlib_create_screen( Display *display )
-{
-   struct sw_winsys *winsys;
-   struct pipe_screen *screen;
-
-   winsys = xlib_create_sw_winsys( display );
-   if (winsys == NULL)
-      return NULL;
-
-   screen = create_screen(winsys);
-   if (screen == NULL)
-      goto fail;
-
-   /* Finally we have somewhere to inject layers into the stack in a
-    * clean fashion:
-    */
-   if (debug_get_bool_option("GALLIUM_WRAP", FALSE)) {
-      screen = identity_screen_create(screen);
-   }
-
-   if (debug_get_bool_option("GALLIUM_TRACE", FALSE)) {
-      screen = trace_screen_create( screen );
-   }
-
-   return screen;
-
-fail:
-   if (winsys)
-      winsys->destroy( winsys );
-
-   return NULL;
-}
-
-
 struct xm_driver xlib_driver = 
 {
-   .create_pipe_screen = xlib_create_screen,
+   .create_pipe_screen = swrast_xlib_create_screen,
 };
 
 
-
-
 /* Build the rendering stack.
  */
 static void _init( void ) __attribute__((constructor));

src/gallium/winsys/drm/i965/xlib/xlib_i965.c

@@ -38,7 +38,7 @@
 #include "pipe/p_error.h"
 #include "pipe/p_context.h"
 
-#include "xm_winsys.h"
+#include "xm_public.h"
 
 #include "i965/brw_winsys.h"
 #include "i965/brw_screen.h"