Merge branch 'gallium-winsys-private' into gallium-0.2

101 files changed, 424 insertions, 411 deletions

diff --git a/src/gallium/auxiliary/pipebuffer/Makefile b/src/gallium/auxiliary/pipebuffer/Makefile
index 4bcf08f8a53..3b501c51dff 100644
--- a/src/gallium/auxiliary/pipebuffer/Makefile
+++ b/src/gallium/auxiliary/pipebuffer/Makefile
@@ -14,8 +14,7 @@ C_SOURCES = \
 	pb_bufmgr_ondemand.c \
 	pb_bufmgr_pool.c \
 	pb_bufmgr_slab.c \
-	pb_validate.c \
-	pb_winsys.c
+	pb_validate.c
 
 include ../../Makefile.template
 
diff --git a/src/gallium/auxiliary/pipebuffer/SConscript b/src/gallium/auxiliary/pipebuffer/SConscript
index 4acf7218083..8e9f06abe45 100644
--- a/src/gallium/auxiliary/pipebuffer/SConscript
+++ b/src/gallium/auxiliary/pipebuffer/SConscript
@@ -14,7 +14,6 @@ pipebuffer = env.ConvenienceLibrary(
 		'pb_bufmgr_pool.c',
 		'pb_bufmgr_slab.c',
 		'pb_validate.c',
-		'pb_winsys.c',
 	])
 
 auxiliaries.insert(0, pipebuffer)
diff --git a/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
index aa4b0962740..61afdfe82ad 100644
--- a/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
+++ b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
@@ -44,7 +44,7 @@
 #include "pipe/p_compiler.h"
 #include "pipe/p_error.h"
 #include "pipe/p_debug.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_thread.h"
 #include "util/u_memory.h"
 #include "util/u_double_list.h"
diff --git a/src/gallium/auxiliary/pipebuffer/pb_bufmgr_cache.c b/src/gallium/auxiliary/pipebuffer/pb_bufmgr_cache.c
index f57a7bffd78..a1688537134 100644
--- a/src/gallium/auxiliary/pipebuffer/pb_bufmgr_cache.c
+++ b/src/gallium/auxiliary/pipebuffer/pb_bufmgr_cache.c
@@ -36,7 +36,6 @@
 
 #include "pipe/p_compiler.h"
 #include "pipe/p_debug.h"
-#include "pipe/p_winsys.h"
 #include "pipe/p_thread.h"
 #include "util/u_memory.h"
 #include "util/u_double_list.h"
diff --git a/src/gallium/auxiliary/pipebuffer/pb_bufmgr_debug.c b/src/gallium/auxiliary/pipebuffer/pb_bufmgr_debug.c
index 62639fe1c87..26d9c24aec2 100644
--- a/src/gallium/auxiliary/pipebuffer/pb_bufmgr_debug.c
+++ b/src/gallium/auxiliary/pipebuffer/pb_bufmgr_debug.c
@@ -35,7 +35,6 @@
 
 #include "pipe/p_compiler.h"
 #include "pipe/p_debug.h"
-#include "pipe/p_winsys.h"
 #include "pipe/p_thread.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
diff --git a/src/gallium/auxiliary/pipebuffer/pb_winsys.c b/src/gallium/auxiliary/pipebuffer/pb_winsys.c
deleted file mode 100644
index 452835fdad3..00000000000
--- a/src/gallium/auxiliary/pipebuffer/pb_winsys.c
+++ /dev/null
@@ -1,191 +0,0 @@
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
-
-/**
- * \file
- * Implementation of client buffer (also designated as "user buffers"), which
- * are just state-tracker owned data masqueraded as buffers.
- * 
- * \author Jose Fonseca <[email protected]>
- */
-
-
-#include "pipe/p_winsys.h"
-#include "util/u_memory.h"
-
-#include "pb_buffer.h"
-#include "pb_winsys.h"
-
-
-/**
- * User buffers are special buffers that initially reference memory
- * held by the user but which may if necessary copy that memory into
- * device memory behind the scenes, for submission to hardware.
- *
- * These are particularly useful when the referenced data is never
- * submitted to hardware at all, in the particular case of software
- * vertex processing.
- */
-struct pb_user_buffer 
-{
-   struct pb_buffer base;
-   void *data;
-};
-
-
-extern const struct pb_vtbl pb_user_buffer_vtbl;
-
-
-static INLINE struct pb_user_buffer *
-pb_user_buffer(struct pb_buffer *buf)
-{
-   assert(buf);
-   assert(buf->vtbl == &pb_user_buffer_vtbl);
-   return (struct pb_user_buffer *)buf;
-}
-
-
-static void
-pb_user_buffer_destroy(struct pb_buffer *buf)
-{
-   assert(buf);
-   FREE(buf);
-}
-
-
-static void *
-pb_user_buffer_map(struct pb_buffer *buf, 
-                   unsigned flags)
-{
-   return pb_user_buffer(buf)->data;
-}
-
-
-static void
-pb_user_buffer_unmap(struct pb_buffer *buf)
-{
-   /* No-op */
-}
-
-
-static enum pipe_error 
-pb_user_buffer_validate(struct pb_buffer *buf, 
-                        struct pb_validate *vl,
-                        unsigned flags)
-{
-   assert(0);
-   return PIPE_ERROR;
-}
-
-
-static void
-pb_user_buffer_fence(struct pb_buffer *buf, 
-                     struct pipe_fence_handle *fence)
-{
-   assert(0);
-}
-
-
-static void
-pb_user_buffer_get_base_buffer(struct pb_buffer *buf,
-                               struct pb_buffer **base_buf,
-                               unsigned *offset)
-{
-   *base_buf = buf;
-   *offset = 0;
-}
-
-
-const struct pb_vtbl 
-pb_user_buffer_vtbl = {
-      pb_user_buffer_destroy,
-      pb_user_buffer_map,
-      pb_user_buffer_unmap,
-      pb_user_buffer_validate,
-      pb_user_buffer_fence,
-      pb_user_buffer_get_base_buffer
-};
-
-
-struct pipe_buffer *
-pb_winsys_user_buffer_create(struct pipe_winsys *winsys,
-                             void *data, 
-                             unsigned bytes) 
-{
-   struct pb_user_buffer *buf = CALLOC_STRUCT(pb_user_buffer);
-
-   if(!buf)
-      return NULL;
-   
-   buf->base.base.refcount = 1;
-   buf->base.base.size = bytes;
-   buf->base.base.alignment = 0;
-   buf->base.base.usage = 0;
-
-   buf->base.vtbl = &pb_user_buffer_vtbl;   
-   buf->data = data;
-   
-   return &buf->base.base;
-}
-
-
-void *
-pb_winsys_buffer_map(struct pipe_winsys *winsys,
-                     struct pipe_buffer *buf,
-                     unsigned flags)
-{
-   (void)winsys;
-   return pb_map(pb_buffer(buf), flags);
-}
-
-
-void
-pb_winsys_buffer_unmap(struct pipe_winsys *winsys,
-                       struct pipe_buffer *buf)
-{
-   (void)winsys;
-   pb_unmap(pb_buffer(buf));
-}
-
-
-void
-pb_winsys_buffer_destroy(struct pipe_winsys *winsys,
-                         struct pipe_buffer *buf)
-{
-   (void)winsys;
-   pb_destroy(pb_buffer(buf));
-}
-
-
-void 
-pb_init_winsys(struct pipe_winsys *winsys)
-{
-   winsys->user_buffer_create = pb_winsys_user_buffer_create;
-   winsys->buffer_map = pb_winsys_buffer_map;
-   winsys->buffer_unmap = pb_winsys_buffer_unmap;
-   winsys->buffer_destroy = pb_winsys_buffer_destroy;
-}
diff --git a/src/gallium/auxiliary/util/Makefile b/src/gallium/auxiliary/util/Makefile
index 6773ed73cff..44c23777218 100644
--- a/src/gallium/auxiliary/util/Makefile
+++ b/src/gallium/auxiliary/util/Makefile
@@ -23,7 +23,8 @@ C_SOURCES = \
 	u_stream_wd.c \
 	u_tile.c \
 	u_time.c \
-	u_timed_winsys.c
+	u_timed_winsys.c \
+	u_simple_screen.c
 
 include ../../Makefile.template
 
diff --git a/src/gallium/auxiliary/util/SConscript b/src/gallium/auxiliary/util/SConscript
index 5df932c0f71..35f683fb8e6 100644
--- a/src/gallium/auxiliary/util/SConscript
+++ b/src/gallium/auxiliary/util/SConscript
@@ -24,6 +24,7 @@ util = env.ConvenienceLibrary(
 		'u_tile.c',
 		'u_time.c',
 		'u_timed_winsys.c',
+		'u_simple_screen.c',
 	])
 
 auxiliaries.insert(0, util)
diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index bc88086b5e0..841e9c01e7e 100644
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -37,7 +37,6 @@
 #include "pipe/p_debug.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
 #include "pipe/p_shader_tokens.h"
 
 #include "util/u_blit.h"
diff --git a/src/gallium/auxiliary/util/u_draw_quad.c b/src/gallium/auxiliary/util/u_draw_quad.c
index 1af575530f5..f282f3d2891 100644
--- a/src/gallium/auxiliary/util/u_draw_quad.c
+++ b/src/gallium/auxiliary/util/u_draw_quad.c
@@ -29,7 +29,6 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
 #include "util/u_draw_quad.h"
 
 
diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index cb9776ed95b..301a58ed7b9 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -38,7 +38,6 @@
 #include "pipe/p_debug.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
 #include "pipe/p_shader_tokens.h"
 
 #include "util/u_memory.h"
diff --git a/src/gallium/auxiliary/util/u_simple_screen.c b/src/gallium/auxiliary/util/u_simple_screen.c
new file mode 100644
index 00000000000..089bbbc48a8
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_simple_screen.c
@@ -0,0 +1,143 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "u_simple_screen.h"
+
+#include "pipe/p_screen.h"
+#include "pipe/internal/p_winsys_screen.h"
+
+
+static struct pipe_buffer *
+pass_buffer_create(struct pipe_screen *screen,
+                   unsigned alignment,
+                   unsigned usage,
+                   unsigned size)
+{
+   return screen->winsys->buffer_create(screen->winsys,
+                                        alignment, usage, size);
+}
+
+static struct pipe_buffer *
+pass_user_buffer_create(struct pipe_screen *screen,
+                        void *ptr,
+                        unsigned bytes)
+{
+   return screen->winsys->user_buffer_create(screen->winsys,
+                                             ptr, bytes);
+}
+
+static struct pipe_buffer *
+pass_surface_buffer_create(struct pipe_screen *screen,
+                           unsigned width, unsigned height,
+                           enum pipe_format format,
+                           unsigned usage,
+                           unsigned *stride)
+{
+   return screen->winsys->surface_buffer_create(screen->winsys,
+                                                width, height,
+                                                format, usage, stride);
+}
+
+static void *
+pass_buffer_map(struct pipe_screen *screen,
+                struct pipe_buffer *buf,
+                unsigned usage)
+{
+   return screen->winsys->buffer_map(screen->winsys,
+                                     buf, usage);
+}
+
+static void
+pass_buffer_unmap(struct pipe_screen *screen,
+                  struct pipe_buffer *buf)
+{
+   screen->winsys->buffer_unmap(screen->winsys, buf);
+}
+
+static void
+pass_buffer_destroy(struct pipe_screen *screen,
+                    struct pipe_buffer *buf)
+{
+   screen->winsys->buffer_destroy(screen->winsys, buf);
+}
+
+
+static void
+pass_flush_frontbuffer(struct pipe_screen *screen,
+                       struct pipe_surface *surf,
+                       void *context_private)
+{
+   screen->winsys->flush_frontbuffer(screen->winsys,
+                                     surf, context_private);
+}
+
+static void
+pass_fence_reference(struct pipe_screen *screen,
+                     struct pipe_fence_handle **ptr,
+                     struct pipe_fence_handle *fence)
+{
+   screen->winsys->fence_reference(screen->winsys,
+                                   ptr, fence);
+}
+
+static int
+pass_fence_signalled(struct pipe_screen *screen,
+                     struct pipe_fence_handle *fence,
+                     unsigned flag)
+{
+   return screen->winsys->fence_signalled(screen->winsys,
+                                          fence, flag);
+}
+
+static int
+pass_fence_finish(struct pipe_screen *screen,
+                  struct pipe_fence_handle *fence,
+                  unsigned flag)
+{
+   return screen->winsys->fence_finish(screen->winsys,
+                                       fence, flag);
+}
+
+void u_simple_screen_init(struct pipe_screen *screen)
+{
+   screen->buffer_create = pass_buffer_create;
+   screen->user_buffer_create = pass_user_buffer_create;
+   screen->surface_buffer_create = pass_surface_buffer_create;
+
+   screen->buffer_map = pass_buffer_map;
+   screen->buffer_unmap = pass_buffer_unmap;
+   screen->buffer_destroy = pass_buffer_destroy;
+   screen->flush_frontbuffer = pass_flush_frontbuffer;
+   screen->fence_reference = pass_fence_reference;
+   screen->fence_signalled = pass_fence_signalled;
+   screen->fence_finish = pass_fence_finish;
+}
+
+const char* u_simple_screen_winsys_name(struct pipe_screen *screen)
+{
+   return screen->winsys->get_name(screen->winsys);
+}
diff --git a/src/gallium/auxiliary/pipebuffer/pb_winsys.h b/src/gallium/auxiliary/util/u_simple_screen.h
index 7cf6f8e3f0a..6612a8a7c09 100644
--- a/src/gallium/auxiliary/pipebuffer/pb_winsys.h
+++ b/src/gallium/auxiliary/util/u_simple_screen.h
@@ -1,6 +1,6 @@
 /**************************************************************************
  *
- * Copyright 2009 VMWare, Inc.
+ * Copyright 2009 VMware, Inc.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -18,62 +18,30 @@
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  **************************************************************************/
 
+#ifndef U_SIMPLE_SCREEN_H
+#define U_SIMPLE_SCREEN_H
+
+struct pipe_screen;
+struct pipe_winsys;
+
 /**
- * @file
- * Drop-in replacements for winsys buffer callbacks.
+ * The following function initializes a simple passthrough screen.
  *
- * The requirement to use this functions is that all pipe_buffers must be in
- * fact pb_buffers.
- * 
- * @author Jose Fonseca <[email protected]>
+ * All the relevant screen function pointers will forwarded to the
+ * winsys.
  */
+void u_simple_screen_init(struct pipe_screen *screen);
 
-#ifndef PB_WINSYS_H_
-#define PB_WINSYS_H_
-
-
-#include "pipe/p_compiler.h"
-#include "pipe/p_debug.h"
-#include "pipe/p_state.h"
-#include "pipe/p_inlines.h"
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-struct pipe_buffer *
-pb_winsys_user_buffer_create(struct pipe_winsys *winsys,
-			     void *data, 
-			     unsigned bytes);
-                                
-void *
-pb_winsys_buffer_map(struct pipe_winsys *winsys,
-		     struct pipe_buffer *buf,
-		     unsigned flags);
-
-void
-pb_winsys_buffer_unmap(struct pipe_winsys *winsys,
-		       struct pipe_buffer *buf);
-
-void
-pb_winsys_buffer_destroy(struct pipe_winsys *winsys,
-			 struct pipe_buffer *buf);
-
-void 
-pb_init_winsys(struct pipe_winsys *winsys);
-
+/**
+ * Returns the name of the winsys associated with this screen.
+ */
+const char* u_simple_screen_winsys_name(struct pipe_screen *screen);
 
-#ifdef __cplusplus
-}
 #endif
-
-#endif /*PB_WINSYS_H_*/
diff --git a/src/gallium/auxiliary/util/u_simple_shaders.c b/src/gallium/auxiliary/util/u_simple_shaders.c
index f06d13c2c4a..706155e99a7 100644
--- a/src/gallium/auxiliary/util/u_simple_shaders.c
+++ b/src/gallium/auxiliary/util/u_simple_shaders.c
@@ -37,7 +37,7 @@
 #include "pipe/p_debug.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/p_screen.h"
 #include "pipe/p_shader_tokens.h"
 
 #include "util/u_memory.h"
diff --git a/src/gallium/auxiliary/util/u_timed_winsys.c b/src/gallium/auxiliary/util/u_timed_winsys.c
index dc3c9be5952..f237e12d735 100644
--- a/src/gallium/auxiliary/util/u_timed_winsys.c
+++ b/src/gallium/auxiliary/util/u_timed_winsys.c
@@ -29,7 +29,7 @@
  * Authors: Keith Whitwell <keithw-at-tungstengraphics-dot-com>
  */
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "u_timed_winsys.h"
 #include "util/u_memory.h"
 #include "util/u_time.h"
@@ -121,7 +121,8 @@ timed_buffer_create(struct pipe_winsys *winsys,
    struct pipe_winsys *backend = timed_winsys(winsys)->backend;
    uint64_t start = time_start();
 
-   struct pipe_buffer *buf = backend->buffer_create( backend, alignment, usage, size );
+   struct pipe_buffer *buf =
+      backend->buffer_create( backend, alignment, usage, size );
 
    time_finish(winsys, start, 0, __FUNCTION__);
    
@@ -300,9 +301,9 @@ struct pipe_winsys *u_timed_winsys_create( struct pipe_winsys *backend )
    ws->base.buffer_unmap = timed_buffer_unmap;
    ws->base.buffer_destroy = timed_buffer_destroy;
    ws->base.buffer_create = timed_buffer_create;
+   ws->base.surface_buffer_create = timed_surface_buffer_create;
    ws->base.flush_frontbuffer = timed_flush_frontbuffer;
    ws->base.get_name = timed_get_name;
-   ws->base.surface_buffer_create = timed_surface_buffer_create;
    ws->base.fence_reference = timed_fence_reference;
    ws->base.fence_signalled = timed_fence_signalled;
    ws->base.fence_finish = timed_fence_finish;
diff --git a/src/gallium/drivers/cell/ppu/cell_context.c b/src/gallium/drivers/cell/ppu/cell_context.c
index 8f502823f99..ae82ded334a 100644
--- a/src/gallium/drivers/cell/ppu/cell_context.c
+++ b/src/gallium/drivers/cell/ppu/cell_context.c
@@ -36,7 +36,7 @@
 #include "pipe/p_defines.h"
 #include "pipe/p_format.h"
 #include "util/u_memory.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_screen.h"
 
 #include "draw/draw_context.h"
diff --git a/src/gallium/drivers/cell/ppu/cell_draw_arrays.c b/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
index 880d5353207..67949b73dd6 100644
--- a/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
+++ b/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
@@ -33,7 +33,7 @@
 
 #include "pipe/p_defines.h"
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 
 #include "cell_context.h"
@@ -53,7 +53,7 @@ cell_map_constant_buffers(struct cell_context *sp)
    for (i = 0; i < 2; i++) {
       if (sp->constants[i].size) {
          sp->mapped_constants[i] = ws->buffer_map(ws, sp->constants[i].buffer,
-                                                  PIPE_BUFFER_USAGE_CPU_READ);
+                                                   PIPE_BUFFER_USAGE_CPU_READ);
          cell_flush_buffer_range(sp, sp->mapped_constants[i], 
                                  sp->constants[i].buffer->size);
       }
diff --git a/src/gallium/drivers/cell/ppu/cell_screen.c b/src/gallium/drivers/cell/ppu/cell_screen.c
index 6fc2257e2a3..512d85d3525 100644
--- a/src/gallium/drivers/cell/ppu/cell_screen.c
+++ b/src/gallium/drivers/cell/ppu/cell_screen.c
@@ -27,7 +27,8 @@
 
 
 #include "util/u_memory.h"
-#include "pipe/p_winsys.h"
+#include "util/u_simple_screen.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
 
@@ -169,6 +170,7 @@ cell_create_screen(struct pipe_winsys *winsys)
    screen->is_format_supported = cell_is_format_supported;
 
    cell_init_screen_texture_funcs(screen);
+   u_simple_screen_init(screen);
 
    return screen;
 }
diff --git a/src/gallium/drivers/cell/ppu/cell_state_shader.c b/src/gallium/drivers/cell/ppu/cell_state_shader.c
index cda39f8d592..990f23e170e 100644
--- a/src/gallium/drivers/cell/ppu/cell_state_shader.c
+++ b/src/gallium/drivers/cell/ppu/cell_state_shader.c
@@ -28,7 +28,7 @@
 #include "pipe/p_defines.h"
 #include "util/u_memory.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "draw/draw_context.h"
 #include "tgsi/tgsi_parse.h"
 
@@ -194,9 +194,9 @@ cell_set_constant_buffer(struct pipe_context *pipe,
    draw_flush(cell->draw);
 
    /* note: reference counting */
-   winsys_buffer_reference(ws,
-                        &cell->constants[shader].buffer,
-                        buf->buffer);
+   pipe_buffer_reference(pipe->screen,
+                         &cell->constants[shader].buffer,
+                         buf->buffer);
    cell->constants[shader].size = buf->size;
 
    if (shader == PIPE_SHADER_VERTEX)
diff --git a/src/gallium/drivers/cell/ppu/cell_texture.c b/src/gallium/drivers/cell/ppu/cell_texture.c
index 9f83ab8fa4c..4f16e2c6afc 100644
--- a/src/gallium/drivers/cell/ppu/cell_texture.c
+++ b/src/gallium/drivers/cell/ppu/cell_texture.c
@@ -34,7 +34,7 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 
@@ -113,7 +113,7 @@ cell_texture_create(struct pipe_screen *screen,
    cell_texture_layout(ct);
 
    ct->buffer = ws->buffer_create(ws, 32, PIPE_BUFFER_USAGE_PIXEL,
-                                  ct->buffer_size);
+                                   ct->buffer_size);
 
    if (!ct->buffer) {
       FREE(ct);
@@ -154,7 +154,7 @@ cell_texture_release(struct pipe_screen *screen,
           */
          if (ct->tiled_buffer[i]) {
             ct->tiled_mapped[i] = NULL;
-            winsys_buffer_reference(screen->winsys, &ct->tiled_buffer[i], NULL);
+            pipe_buffer_reference(screen, &ct->tiled_buffer[i], NULL);
          }
       }
 
@@ -325,11 +325,11 @@ cell_twiddle_texture(struct pipe_screen *screen,
             struct pipe_winsys *ws = screen->winsys;
             uint bytes = bufWidth * bufHeight * 4 * numFaces;
             ct->tiled_buffer[level] = ws->buffer_create(ws, 16,
-                                                        PIPE_BUFFER_USAGE_PIXEL,
-                                                        bytes);
+                                                         PIPE_BUFFER_USAGE_PIXEL,
+                                                         bytes);
             /* and map it */
             ct->tiled_mapped[level] = ws->buffer_map(ws, ct->tiled_buffer[level],
-                                                     PIPE_BUFFER_USAGE_GPU_READ);
+                                                      PIPE_BUFFER_USAGE_GPU_READ);
          }
          dst = (uint *) ((ubyte *) ct->tiled_mapped[level] + offset);
 
@@ -406,7 +406,7 @@ cell_get_tex_surface(struct pipe_screen *screen,
    if (ps) {
       assert(ps->refcount);
       assert(ps->winsys);
-      winsys_buffer_reference(ws, &ps->buffer, ct->buffer);
+      pipe_buffer_reference(screen, &ps->buffer, ct->buffer);
       ps->format = pt->format;
       ps->block = pt->block;
       ps->width = pt->width[level];
diff --git a/src/gallium/drivers/cell/ppu/cell_vertex_shader.c b/src/gallium/drivers/cell/ppu/cell_vertex_shader.c
index 2b10c116fa3..403cf6d50fc 100644
--- a/src/gallium/drivers/cell/ppu/cell_vertex_shader.c
+++ b/src/gallium/drivers/cell/ppu/cell_vertex_shader.c
@@ -31,7 +31,7 @@
 
 #include "pipe/p_defines.h"
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 
 #include "cell_context.h"
diff --git a/src/gallium/drivers/failover/fo_context.c b/src/gallium/drivers/failover/fo_context.c
index 10c4ffc2096..0742b27b8fd 100644
--- a/src/gallium/drivers/failover/fo_context.c
+++ b/src/gallium/drivers/failover/fo_context.c
@@ -27,7 +27,7 @@
 
 
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_memory.h"
 #include "pipe/p_context.h"
 
diff --git a/src/gallium/drivers/i915simple/i915_context.c b/src/gallium/drivers/i915simple/i915_context.c
index 6dd3eda85dc..3e3a5968849 100644
--- a/src/gallium/drivers/i915simple/i915_context.c
+++ b/src/gallium/drivers/i915simple/i915_context.c
@@ -34,7 +34,7 @@
 
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_memory.h"
 #include "pipe/p_screen.h"
diff --git a/src/gallium/drivers/i915simple/i915_debug.c b/src/gallium/drivers/i915simple/i915_debug.c
index 4adf9decae1..a300b61c3b9 100644
--- a/src/gallium/drivers/i915simple/i915_debug.c
+++ b/src/gallium/drivers/i915simple/i915_debug.c
@@ -30,7 +30,7 @@
 #include "i915_winsys.h"
 #include "i915_debug.h"
 #include "i915_batch.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_debug.h"
 
 
diff --git a/src/gallium/drivers/i915simple/i915_debug.h b/src/gallium/drivers/i915simple/i915_debug.h
index c33ee361101..16ca7277c7a 100644
--- a/src/gallium/drivers/i915simple/i915_debug.h
+++ b/src/gallium/drivers/i915simple/i915_debug.h
@@ -72,7 +72,7 @@ void i915_print_ureg(const char *msg, unsigned ureg);
 
 #if defined(DEBUG) && defined(FILE_DEBUG_FLAG)
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 static INLINE void
 I915_DBG(
diff --git a/src/gallium/drivers/i915simple/i915_debug_fp.c b/src/gallium/drivers/i915simple/i915_debug_fp.c
index 48be3e14727..9c5b117b6dd 100644
--- a/src/gallium/drivers/i915simple/i915_debug_fp.c
+++ b/src/gallium/drivers/i915simple/i915_debug_fp.c
@@ -28,7 +28,7 @@
 
 #include "i915_reg.h"
 #include "i915_debug.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_memory.h"
 
 
diff --git a/src/gallium/drivers/i915simple/i915_prim_vbuf.c b/src/gallium/drivers/i915simple/i915_prim_vbuf.c
index a8e97e7c306..f49f6d6ed16 100644
--- a/src/gallium/drivers/i915simple/i915_prim_vbuf.c
+++ b/src/gallium/drivers/i915simple/i915_prim_vbuf.c
@@ -42,7 +42,7 @@
 #include "draw/draw_vbuf.h"
 #include "pipe/p_debug.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 
diff --git a/src/gallium/drivers/i915simple/i915_screen.c b/src/gallium/drivers/i915simple/i915_screen.c
index 1c976082df7..5bb127f3d54 100644
--- a/src/gallium/drivers/i915simple/i915_screen.c
+++ b/src/gallium/drivers/i915simple/i915_screen.c
@@ -27,7 +27,8 @@
 
 
 #include "util/u_memory.h"
-#include "pipe/p_winsys.h"
+#include "util/u_simple_screen.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_string.h"
 
@@ -279,6 +280,7 @@ i915_create_screen(struct pipe_winsys *winsys, uint pci_id)
    i915screen->screen.surface_unmap = i915_surface_unmap;
 
    i915_init_screen_texture_functions(&i915screen->screen);
+   u_simple_screen_init(&i915screen->screen);
 
    return &i915screen->screen;
 }
diff --git a/src/gallium/drivers/i915simple/i915_state.c b/src/gallium/drivers/i915simple/i915_state.c
index 19f194c027d..273e74002aa 100644
--- a/src/gallium/drivers/i915simple/i915_state.c
+++ b/src/gallium/drivers/i915simple/i915_state.c
@@ -30,7 +30,7 @@
 
 
 #include "draw/draw_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
@@ -537,7 +537,7 @@ static void i915_set_constant_buffer(struct pipe_context *pipe,
       void *mapped;
       if (buf->buffer && buf->buffer->size &&
           (mapped = ws->buffer_map(ws, buf->buffer,
-                                   PIPE_BUFFER_USAGE_CPU_READ))) {
+                                    PIPE_BUFFER_USAGE_CPU_READ))) {
          memcpy(i915->current.constants[shader], mapped, buf->buffer->size);
          ws->buffer_unmap(ws, buf->buffer);
          i915->current.num_user_constants[shader]
diff --git a/src/gallium/drivers/i915simple/i915_surface.c b/src/gallium/drivers/i915simple/i915_surface.c
index 3b3d9217a0c..5ffdb76682c 100644
--- a/src/gallium/drivers/i915simple/i915_surface.c
+++ b/src/gallium/drivers/i915simple/i915_surface.c
@@ -31,7 +31,7 @@
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_tile.h"
 #include "util/u_rect.h"
 
diff --git a/src/gallium/drivers/i915simple/i915_texture.c b/src/gallium/drivers/i915simple/i915_texture.c
index 4acc4b02140..803ef3a1871 100644
--- a/src/gallium/drivers/i915simple/i915_texture.c
+++ b/src/gallium/drivers/i915simple/i915_texture.c
@@ -34,7 +34,7 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 
@@ -606,8 +606,8 @@ i915_texture_create(struct pipe_screen *screen,
    tex_size = tex->stride * tex->total_nblocksy;
 
    tex->buffer = ws->buffer_create(ws, 64,
-				   PIPE_BUFFER_USAGE_PIXEL,
-				   tex_size);
+                                    PIPE_BUFFER_USAGE_PIXEL,
+                                    tex_size);
 
    if (!tex->buffer)
       goto fail;
diff --git a/src/gallium/drivers/i965simple/brw_blit.c b/src/gallium/drivers/i965simple/brw_blit.c
index 8494f70493c..4d11f8d2ab8 100644
--- a/src/gallium/drivers/i965simple/brw_blit.c
+++ b/src/gallium/drivers/i965simple/brw_blit.c
@@ -35,7 +35,7 @@
 #include "brw_reg.h"
 
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #define FILE_DEBUG_FLAG DEBUG_BLIT
 
diff --git a/src/gallium/drivers/i965simple/brw_context.c b/src/gallium/drivers/i965simple/brw_context.c
index 96920df0087..c74cbf8d73e 100644
--- a/src/gallium/drivers/i965simple/brw_context.c
+++ b/src/gallium/drivers/i965simple/brw_context.c
@@ -37,7 +37,7 @@
 #include "brw_tex_layout.h"
 #include "brw_winsys.h"
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_context.h"
 #include "util/u_memory.h"
 #include "pipe/p_screen.h"
diff --git a/src/gallium/drivers/i965simple/brw_curbe.c b/src/gallium/drivers/i965simple/brw_curbe.c
index 5e1cce75303..904cde8e301 100644
--- a/src/gallium/drivers/i965simple/brw_curbe.c
+++ b/src/gallium/drivers/i965simple/brw_curbe.c
@@ -38,7 +38,7 @@
 #include "brw_util.h"
 #include "brw_wm.h"
 #include "pipe/p_state.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 
diff --git a/src/gallium/drivers/i965simple/brw_draw.c b/src/gallium/drivers/i965simple/brw_draw.c
index 7598e3dc8af..648aaa0da52 100644
--- a/src/gallium/drivers/i965simple/brw_draw.c
+++ b/src/gallium/drivers/i965simple/brw_draw.c
@@ -34,7 +34,7 @@
 #include "brw_state.h"
 
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 static unsigned hw_prim[PIPE_PRIM_POLYGON+1] = {
    _3DPRIM_POINTLIST,
diff --git a/src/gallium/drivers/i965simple/brw_screen.c b/src/gallium/drivers/i965simple/brw_screen.c
index ab7cd624b27..b22e105f106 100644
--- a/src/gallium/drivers/i965simple/brw_screen.c
+++ b/src/gallium/drivers/i965simple/brw_screen.c
@@ -27,8 +27,9 @@
 
 
 #include "util/u_memory.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_string.h"
+#include "util/u_simple_screen.h"
 
 #include "brw_context.h"
 #include "brw_screen.h"
@@ -239,6 +240,7 @@ brw_create_screen(struct pipe_winsys *winsys, uint pci_id)
    brwscreen->screen.is_format_supported = brw_is_format_supported;
 
    brw_init_screen_texture_funcs(&brwscreen->screen);
+   u_simple_screen_init(&brwscreen->screen);
 
    return &brwscreen->screen;
 }
diff --git a/src/gallium/drivers/i965simple/brw_state.c b/src/gallium/drivers/i965simple/brw_state.c
index af46cb546fa..b47f5373f3c 100644
--- a/src/gallium/drivers/i965simple/brw_state.c
+++ b/src/gallium/drivers/i965simple/brw_state.c
@@ -30,7 +30,7 @@
  */
 
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_memory.h"
 #include "pipe/p_inlines.h"
 #include "pipe/p_shader_tokens.h"
diff --git a/src/gallium/drivers/i965simple/brw_state_pool.c b/src/gallium/drivers/i965simple/brw_state_pool.c
index 007dc8f9deb..e91263cb1ff 100644
--- a/src/gallium/drivers/i965simple/brw_state_pool.c
+++ b/src/gallium/drivers/i965simple/brw_state_pool.c
@@ -42,7 +42,7 @@
  * the pool.
  */
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/drivers/i965simple/brw_surface.c b/src/gallium/drivers/i965simple/brw_surface.c
index b89756c47b0..3159eba2fd1 100644
--- a/src/gallium/drivers/i965simple/brw_surface.c
+++ b/src/gallium/drivers/i965simple/brw_surface.c
@@ -30,7 +30,7 @@
 #include "brw_state.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_tile.h"
 #include "util/u_rect.h"
 
diff --git a/src/gallium/drivers/i965simple/brw_tex_layout.c b/src/gallium/drivers/i965simple/brw_tex_layout.c
index 12e2e02cfdc..6af0d5cf4b2 100644
--- a/src/gallium/drivers/i965simple/brw_tex_layout.c
+++ b/src/gallium/drivers/i965simple/brw_tex_layout.c
@@ -37,7 +37,7 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 #include "brw_context.h"
@@ -296,9 +296,9 @@ brw_texture_create_screen(struct pipe_screen *screen,
    
       if (brw_miptree_layout(tex))
 	 tex->buffer = ws->buffer_create(ws, 64,
-                                         PIPE_BUFFER_USAGE_PIXEL,
-                                         tex->stride *
-                                         tex->total_nblocksy);
+                                          PIPE_BUFFER_USAGE_PIXEL,
+                                          tex->stride *
+                                          tex->total_nblocksy);
 
       if (!tex->buffer) {
 	 FREE(tex);
@@ -322,7 +322,6 @@ brw_texture_release_screen(struct pipe_screen *screen,
        __FUNCTION__, (void *) *pt, (*pt)->refcount - 1);
    */
    if (--(*pt)->refcount <= 0) {
-      struct pipe_winsys *ws = screen->winsys;
       struct brw_texture *tex = (struct brw_texture *)*pt;
       uint i;
 
@@ -330,7 +329,7 @@ brw_texture_release_screen(struct pipe_screen *screen,
       DBG("%s deleting %p\n", __FUNCTION__, (void *) tex);
       */
 
-      winsys_buffer_reference(ws, &tex->buffer, NULL);
+      pipe_buffer_reference(screen, &tex->buffer, NULL);
 
       for (i = 0; i < PIPE_MAX_TEXTURE_LEVELS; i++)
          if (tex->image_offset[i])
@@ -347,7 +346,6 @@ brw_get_tex_surface_screen(struct pipe_screen *screen,
                            struct pipe_texture *pt,
                            unsigned face, unsigned level, unsigned zslice)
 {
-   struct pipe_winsys *ws = screen->winsys;
    struct brw_texture *tex = (struct brw_texture *)pt;
    struct pipe_surface *ps;
    unsigned offset;  /* in bytes */
@@ -369,7 +367,7 @@ brw_get_tex_surface_screen(struct pipe_screen *screen,
    if (ps) {
       ps->refcount = 1;
       pipe_texture_reference(&ps->texture, pt);
-      winsys_buffer_reference(ws, &ps->buffer, tex->buffer);
+      pipe_buffer_reference(screen, &ps->buffer, tex->buffer);
       ps->format = pt->format;
       ps->width = pt->width[level];
       ps->height = pt->height[level];
diff --git a/src/gallium/drivers/nouveau/nouveau_winsys.h b/src/gallium/drivers/nouveau/nouveau_winsys.h
index 5535ebb6a99..25e0b05be12 100644
--- a/src/gallium/drivers/nouveau/nouveau_winsys.h
+++ b/src/gallium/drivers/nouveau/nouveau_winsys.h
@@ -2,7 +2,7 @@
 #define NOUVEAU_WINSYS_H
 
 #include <stdint.h>
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_defines.h"
 
 #include "nouveau/nouveau_bo.h"
diff --git a/src/gallium/drivers/nv04/nv04_context.c b/src/gallium/drivers/nv04/nv04_context.c
index 9f75253363f..a14273e2883 100644
--- a/src/gallium/drivers/nv04/nv04_context.c
+++ b/src/gallium/drivers/nv04/nv04_context.c
@@ -1,6 +1,6 @@
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv04_context.h"
 #include "nv04_screen.h"
diff --git a/src/gallium/drivers/nv04/nv04_prim_vbuf.c b/src/gallium/drivers/nv04/nv04_prim_vbuf.c
index 19979fff795..18a8872ae38 100644
--- a/src/gallium/drivers/nv04/nv04_prim_vbuf.c
+++ b/src/gallium/drivers/nv04/nv04_prim_vbuf.c
@@ -1,7 +1,7 @@
 
 #include "pipe/p_debug.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_compiler.h"
 
 #include "draw/draw_vbuf.h"
diff --git a/src/gallium/drivers/nv04/nv04_screen.c b/src/gallium/drivers/nv04/nv04_screen.c
index 65eacde6b2e..9ce3176aa14 100644
--- a/src/gallium/drivers/nv04/nv04_screen.c
+++ b/src/gallium/drivers/nv04/nv04_screen.c
@@ -1,4 +1,5 @@
 #include "pipe/p_screen.h"
+#include "util/u_simple_screen.h"
 
 #include "nv04_context.h"
 #include "nv04_screen.h"
@@ -208,6 +209,7 @@ nv04_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 	screen->pipe.surface_unmap = nv04_surface_unmap;
 
 	nv04_screen_init_miptree_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv04/nv04_surface.c b/src/gallium/drivers/nv04/nv04_surface.c
index 9d9943ed4e4..0d0983f9d4c 100644
--- a/src/gallium/drivers/nv04/nv04_surface.c
+++ b/src/gallium/drivers/nv04/nv04_surface.c
@@ -28,7 +28,7 @@
 
 #include "nv04_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_tile.h"
 
diff --git a/src/gallium/drivers/nv10/nv10_context.c b/src/gallium/drivers/nv10/nv10_context.c
index 4eb4ed9185e..ef2c0c5d9fd 100644
--- a/src/gallium/drivers/nv10/nv10_context.c
+++ b/src/gallium/drivers/nv10/nv10_context.c
@@ -1,6 +1,6 @@
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv10_context.h"
 #include "nv10_screen.h"
diff --git a/src/gallium/drivers/nv10/nv10_prim_vbuf.c b/src/gallium/drivers/nv10/nv10_prim_vbuf.c
index e7e81d3dff8..7435d873154 100644
--- a/src/gallium/drivers/nv10/nv10_prim_vbuf.c
+++ b/src/gallium/drivers/nv10/nv10_prim_vbuf.c
@@ -40,7 +40,7 @@
 
 #include "pipe/p_debug.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv10_context.h"
 #include "nv10_state.h"
diff --git a/src/gallium/drivers/nv10/nv10_screen.c b/src/gallium/drivers/nv10/nv10_screen.c
index 4d9fbd4b5f6..12516fd71e7 100644
--- a/src/gallium/drivers/nv10/nv10_screen.c
+++ b/src/gallium/drivers/nv10/nv10_screen.c
@@ -1,4 +1,5 @@
 #include "pipe/p_screen.h"
+#include "util/u_simple_screen.h"
 
 #include "nv10_context.h"
 #include "nv10_screen.h"
@@ -204,6 +205,7 @@ nv10_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 	screen->pipe.surface_unmap = nv10_surface_unmap;
 
 	nv10_screen_init_miptree_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv10/nv10_surface.c b/src/gallium/drivers/nv10/nv10_surface.c
index be44c7bed50..78fd7b42dac 100644
--- a/src/gallium/drivers/nv10/nv10_surface.c
+++ b/src/gallium/drivers/nv10/nv10_surface.c
@@ -28,7 +28,7 @@
 
 #include "nv10_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_tile.h"
 
diff --git a/src/gallium/drivers/nv20/nv20_context.c b/src/gallium/drivers/nv20/nv20_context.c
index e620166ff55..1659aec8fab 100644
--- a/src/gallium/drivers/nv20/nv20_context.c
+++ b/src/gallium/drivers/nv20/nv20_context.c
@@ -1,6 +1,6 @@
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv20_context.h"
 #include "nv20_screen.h"
diff --git a/src/gallium/drivers/nv20/nv20_prim_vbuf.c b/src/gallium/drivers/nv20/nv20_prim_vbuf.c
index 74540845a87..4dd7052814e 100644
--- a/src/gallium/drivers/nv20/nv20_prim_vbuf.c
+++ b/src/gallium/drivers/nv20/nv20_prim_vbuf.c
@@ -40,7 +40,7 @@
 
 #include "pipe/p_debug.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv20_context.h"
 #include "nv20_state.h"
diff --git a/src/gallium/drivers/nv20/nv20_screen.c b/src/gallium/drivers/nv20/nv20_screen.c
index 2ca6e6b1498..f09b364b8d9 100644
--- a/src/gallium/drivers/nv20/nv20_screen.c
+++ b/src/gallium/drivers/nv20/nv20_screen.c
@@ -1,4 +1,5 @@
 #include "pipe/p_screen.h"
+#include "util/u_simple_screen.h"
 
 #include "nv20_context.h"
 #include "nv20_screen.h"
@@ -200,6 +201,7 @@ nv20_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 	screen->pipe.surface_unmap = nv20_surface_unmap;
 
 	nv20_screen_init_miptree_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv20/nv20_surface.c b/src/gallium/drivers/nv20/nv20_surface.c
index 7bc68d0ca26..9b4c028eae6 100644
--- a/src/gallium/drivers/nv20/nv20_surface.c
+++ b/src/gallium/drivers/nv20/nv20_surface.c
@@ -28,7 +28,7 @@
 
 #include "nv20_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_tile.h"
 
diff --git a/src/gallium/drivers/nv30/nv30_context.c b/src/gallium/drivers/nv30/nv30_context.c
index 2bff28aca9c..61654f8756a 100644
--- a/src/gallium/drivers/nv30/nv30_context.c
+++ b/src/gallium/drivers/nv30/nv30_context.c
@@ -1,6 +1,6 @@
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv30_context.h"
 #include "nv30_screen.h"
diff --git a/src/gallium/drivers/nv30/nv30_miptree.c b/src/gallium/drivers/nv30/nv30_miptree.c
index 54fb3585f8a..79baac714ce 100644
--- a/src/gallium/drivers/nv30/nv30_miptree.c
+++ b/src/gallium/drivers/nv30/nv30_miptree.c
@@ -181,7 +181,7 @@ nv30_miptree_surface_del(struct pipe_screen *pscreen,
 		return;
 
 	pipe_texture_reference(&ps->texture, NULL);
-	pipe_buffer_reference(pscreen->winsys, &ps->buffer, NULL);
+	pipe_buffer_reference(pscreen, &ps->buffer, NULL);
 	FREE(ps);
 }
 
diff --git a/src/gallium/drivers/nv30/nv30_screen.c b/src/gallium/drivers/nv30/nv30_screen.c
index 1fac6d3df83..0f10d914ad2 100644
--- a/src/gallium/drivers/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nv30/nv30_screen.c
@@ -1,4 +1,5 @@
 #include "pipe/p_screen.h"
+#include "util/u_simple_screen.h"
 
 #include "nv30_context.h"
 #include "nv30_screen.h"
@@ -381,6 +382,7 @@ nv30_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 	screen->pipe.surface_unmap = nv30_surface_unmap;
 
 	nv30_screen_init_miptree_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv30/nv30_surface.c b/src/gallium/drivers/nv30/nv30_surface.c
index d3376a73bf5..806131dcc95 100644
--- a/src/gallium/drivers/nv30/nv30_surface.c
+++ b/src/gallium/drivers/nv30/nv30_surface.c
@@ -28,7 +28,7 @@
 
 #include "nv30_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 
 #include "util/u_tile.h"
diff --git a/src/gallium/drivers/nv40/nv40_context.c b/src/gallium/drivers/nv40/nv40_context.c
index cc63dd734bc..5d325f5067f 100644
--- a/src/gallium/drivers/nv40/nv40_context.c
+++ b/src/gallium/drivers/nv40/nv40_context.c
@@ -1,6 +1,6 @@
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv40_context.h"
 #include "nv40_screen.h"
diff --git a/src/gallium/drivers/nv40/nv40_draw.c b/src/gallium/drivers/nv40/nv40_draw.c
index 8e56cdc2fe0..c83ff91d7e3 100644
--- a/src/gallium/drivers/nv40/nv40_draw.c
+++ b/src/gallium/drivers/nv40/nv40_draw.c
@@ -242,7 +242,7 @@ nv40_draw_elements_swtnl(struct pipe_context *pipe,
 
 	for (i = 0; i < nv40->vtxbuf_nr; i++) {
 		map = ws->buffer_map(ws, nv40->vtxbuf[i].buffer,
-				     PIPE_BUFFER_USAGE_CPU_READ);
+                                      PIPE_BUFFER_USAGE_CPU_READ);
 		draw_set_mapped_vertex_buffer(nv40->draw, i, map);
 	}
 
diff --git a/src/gallium/drivers/nv40/nv40_screen.c b/src/gallium/drivers/nv40/nv40_screen.c
index ab128fecda7..46fe133d71c 100644
--- a/src/gallium/drivers/nv40/nv40_screen.c
+++ b/src/gallium/drivers/nv40/nv40_screen.c
@@ -1,4 +1,5 @@
 #include "pipe/p_screen.h"
+#include "util/u_simple_screen.h"
 
 #include "nv40_context.h"
 #include "nv40_screen.h"
@@ -363,6 +364,7 @@ nv40_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 	screen->pipe.surface_unmap = nv40_surface_unmap;
 
 	nv40_screen_init_miptree_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv40/nv40_surface.c b/src/gallium/drivers/nv40/nv40_surface.c
index 576af7c59ee..aa51d040519 100644
--- a/src/gallium/drivers/nv40/nv40_surface.c
+++ b/src/gallium/drivers/nv40/nv40_surface.c
@@ -28,7 +28,7 @@
 
 #include "nv40_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 
 #include "util/u_tile.h"
diff --git a/src/gallium/drivers/nv50/nv50_context.c b/src/gallium/drivers/nv50/nv50_context.c
index b02c53f2095..99776239d2b 100644
--- a/src/gallium/drivers/nv50/nv50_context.c
+++ b/src/gallium/drivers/nv50/nv50_context.c
@@ -22,7 +22,7 @@
 
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 #include "nv50_context.h"
 #include "nv50_screen.h"
diff --git a/src/gallium/drivers/nv50/nv50_query.c b/src/gallium/drivers/nv50/nv50_query.c
index b923c820eba..1b3a41340a9 100644
--- a/src/gallium/drivers/nv50/nv50_query.c
+++ b/src/gallium/drivers/nv50/nv50_query.c
@@ -62,7 +62,7 @@ nv50_query_destroy(struct pipe_context *pipe, struct pipe_query *pq)
 	struct nv50_query *q = nv50_query(pq);
 
 	if (q) {
-		pipe_buffer_reference(pipe, &q->buffer, NULL);
+		pipe_buffer_reference(pipe->screen, &q->buffer, NULL);
 		FREE(q);
 	}
 }
diff --git a/src/gallium/drivers/nv50/nv50_screen.c b/src/gallium/drivers/nv50/nv50_screen.c
index ef46233f839..6cddddacd5b 100644
--- a/src/gallium/drivers/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nv50/nv50_screen.c
@@ -22,6 +22,8 @@
 
 #include "pipe/p_screen.h"
 
+#include "util/u_simple_screen.h"
+
 #include "nv50_context.h"
 #include "nv50_screen.h"
 
@@ -323,6 +325,7 @@ nv50_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
 
 	nv50_screen_init_miptree_functions(&screen->pipe);
 	nv50_surface_init_screen_functions(&screen->pipe);
+	u_simple_screen_init(&screen->pipe);
 
 	return &screen->pipe;
 }
diff --git a/src/gallium/drivers/nv50/nv50_surface.c b/src/gallium/drivers/nv50/nv50_surface.c
index 3f45a2fe186..ed6602ba364 100644
--- a/src/gallium/drivers/nv50/nv50_surface.c
+++ b/src/gallium/drivers/nv50/nv50_surface.c
@@ -22,7 +22,7 @@
 
 #include "nv50_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 
 #include "util/u_tile.h"
diff --git a/src/gallium/drivers/softpipe/sp_context.c b/src/gallium/drivers/softpipe/sp_context.c
index d8a5631488f..c2d882a8197 100644
--- a/src/gallium/drivers/softpipe/sp_context.c
+++ b/src/gallium/drivers/softpipe/sp_context.c
@@ -87,7 +87,7 @@ softpipe_unmap_surfaces(struct softpipe_context *sp)
 static void softpipe_destroy( struct pipe_context *pipe )
 {
    struct softpipe_context *softpipe = softpipe_context( pipe );
-   struct pipe_winsys *ws = pipe->winsys;
+   struct pipe_screen *screen = pipe->screen;
    uint i;
 
    if (softpipe->draw)
@@ -116,7 +116,7 @@ static void softpipe_destroy( struct pipe_context *pipe )
 
    for (i = 0; i < Elements(softpipe->constants); i++) {
       if (softpipe->constants[i].buffer) {
-         winsys_buffer_reference(ws, &softpipe->constants[i].buffer, NULL);
+         pipe_buffer_reference(screen, &softpipe->constants[i].buffer, NULL);
       }
    }
 
diff --git a/src/gallium/drivers/softpipe/sp_draw_arrays.c b/src/gallium/drivers/softpipe/sp_draw_arrays.c
index ed3e8f95ae7..ecc9d003192 100644
--- a/src/gallium/drivers/softpipe/sp_draw_arrays.c
+++ b/src/gallium/drivers/softpipe/sp_draw_arrays.c
@@ -33,7 +33,7 @@
 
 #include "pipe/p_defines.h"
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 
 #include "sp_context.h"
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 11b08b3a82d..7380a6ae2be 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -27,7 +27,8 @@
 
 
 #include "util/u_memory.h"
-#include "pipe/p_winsys.h"
+#include "util/u_simple_screen.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
 
@@ -174,6 +175,7 @@ softpipe_create_screen(struct pipe_winsys *winsys)
    screen->base.is_format_supported = softpipe_is_format_supported;
 
    softpipe_init_screen_texture_funcs(&screen->base);
+   u_simple_screen_init(&screen->base);
 
    return &screen->base;
 }
diff --git a/src/gallium/drivers/softpipe/sp_state_fs.c b/src/gallium/drivers/softpipe/sp_state_fs.c
index 15815160edf..4d01a9dbe15 100644
--- a/src/gallium/drivers/softpipe/sp_state_fs.c
+++ b/src/gallium/drivers/softpipe/sp_state_fs.c
@@ -32,7 +32,7 @@
 #include "pipe/p_defines.h"
 #include "util/u_memory.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_shader_tokens.h"
 #include "draw/draw_context.h"
 #include "tgsi/tgsi_dump.h"
@@ -146,13 +146,13 @@ softpipe_set_constant_buffer(struct pipe_context *pipe,
                              const struct pipe_constant_buffer *buf)
 {
    struct softpipe_context *softpipe = softpipe_context(pipe);
-   struct pipe_winsys *ws = pipe->winsys;
+   struct pipe_screen *screen = pipe->screen;
 
    assert(shader < PIPE_SHADER_TYPES);
    assert(index == 0);
 
    /* note: reference counting */
-   winsys_buffer_reference(ws,
+   pipe_buffer_reference(screen,
 			 &softpipe->constants[shader].buffer,
 			 buf ? buf->buffer : NULL);
 
diff --git a/src/gallium/drivers/softpipe/sp_texture.c b/src/gallium/drivers/softpipe/sp_texture.c
index faf9e871f93..5952378152d 100644
--- a/src/gallium/drivers/softpipe/sp_texture.c
+++ b/src/gallium/drivers/softpipe/sp_texture.c
@@ -33,7 +33,7 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 
@@ -106,11 +106,11 @@ softpipe_displaytarget_layout(struct pipe_screen *screen,
    spt->base.nblocksy[0] = pf_get_nblocksy(&spt->base.block, spt->base.height[0]);  
 
    spt->buffer = ws->surface_buffer_create( ws, 
-                                           spt->base.width[0], 
-                                           spt->base.height[0],
-                                           spt->base.format,
-                                           usage,
-                                           &spt->stride[0]);
+                                            spt->base.width[0], 
+                                            spt->base.height[0],
+                                            spt->base.format,
+                                            usage,
+                                            &spt->stride[0]);
 
    return spt->buffer != NULL;
 }
diff --git a/src/gallium/drivers/trace/tr_winsys.h b/src/gallium/drivers/trace/tr_winsys.h
index 062ddf66a00..0fd2a405569 100644
--- a/src/gallium/drivers/trace/tr_winsys.h
+++ b/src/gallium/drivers/trace/tr_winsys.h
@@ -31,7 +31,7 @@
 
 #include "pipe/p_compiler.h"
 #include "pipe/p_debug.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 
 /**
diff --git a/src/gallium/include/pipe/p_winsys.h b/src/gallium/include/pipe/internal/p_winsys_screen.h
index 3ae83e8105d..ee835578b23 100644
--- a/src/gallium/include/pipe/p_winsys.h
+++ b/src/gallium/include/pipe/internal/p_winsys_screen.h
@@ -36,7 +36,7 @@
 #define P_WINSYS_H
 
 
-#include "p_format.h"
+#include "pipe/p_format.h"
 
 
 #ifdef __cplusplus
@@ -178,7 +178,6 @@ struct pipe_winsys
 
 };
 
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/gallium/include/pipe/p_inlines.h b/src/gallium/include/pipe/p_inlines.h
index 73783926169..1219c817b4c 100644
--- a/src/gallium/include/pipe/p_inlines.h
+++ b/src/gallium/include/pipe/p_inlines.h
@@ -31,7 +31,6 @@
 #include "p_context.h"
 #include "p_defines.h"
 #include "p_screen.h"
-#include "p_winsys.h"
 
 
 #ifdef __cplusplus
@@ -89,29 +88,6 @@ pipe_surface_reference(struct pipe_surface **ptr, struct pipe_surface *surf)
 }
 
 
-/* XXX: thread safety issues!
- */
-static INLINE void
-winsys_buffer_reference(struct pipe_winsys *winsys,
-		      struct pipe_buffer **ptr,
-		      struct pipe_buffer *buf)
-{
-   if (buf) {
-      assert(buf->refcount);
-      buf->refcount++;
-   }
-
-   if (*ptr) {
-      assert((*ptr)->refcount);
-      if(--(*ptr)->refcount == 0)
-         winsys->buffer_destroy( winsys, *ptr );
-   }
-
-   *ptr = buf;
-}
-
-
-
 /**
  * \sa pipe_surface_reference
  */
@@ -152,20 +128,20 @@ pipe_texture_release(struct pipe_texture **ptr)
 
 
 /**
- * Convenience wrappers for winsys buffer functions.
+ * Convenience wrappers for screen buffer functions.
  */
 
 static INLINE struct pipe_buffer *
 pipe_buffer_create( struct pipe_screen *screen,
                     unsigned alignment, unsigned usage, unsigned size )
 {
-   return screen->winsys->buffer_create(screen->winsys, alignment, usage, size);
+   return screen->buffer_create(screen, alignment, usage, size);
 }
 
 static INLINE struct pipe_buffer *
 pipe_user_buffer_create( struct pipe_screen *screen, void *ptr, unsigned size )
 {
-   return screen->winsys->user_buffer_create(screen->winsys, ptr, size);
+   return screen->user_buffer_create(screen, ptr, size);
 }
 
 static INLINE void *
@@ -173,25 +149,36 @@ pipe_buffer_map(struct pipe_screen *screen,
                 struct pipe_buffer *buf,
                 unsigned usage)
 {
-   return screen->winsys->buffer_map(screen->winsys, buf, usage);
+   return screen->buffer_map(screen, buf, usage);
 }
 
 static INLINE void
 pipe_buffer_unmap(struct pipe_screen *screen,
                   struct pipe_buffer *buf)
 {
-   screen->winsys->buffer_unmap(screen->winsys, buf);
+   screen->buffer_unmap(screen, buf);
 }
 
-/* XXX when we're using this everywhere, get rid of
- * winsys_buffer_reference() above.
+/* XXX: thread safety issues!
  */
 static INLINE void
 pipe_buffer_reference(struct pipe_screen *screen,
 		      struct pipe_buffer **ptr,
 		      struct pipe_buffer *buf)
 {
-   winsys_buffer_reference(screen->winsys, ptr, buf);
+   if (buf) {
+      assert(buf->refcount);
+      buf->refcount++;
+   }
+
+   if (*ptr) {
+      assert((*ptr)->refcount);
+      if(--(*ptr)->refcount == 0) {
+         screen->buffer_destroy( screen, *ptr );
+      }
+   }
+
+   *ptr = buf;
 }
 
 
diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index 492667c93ac..0bd7d12e221 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -48,6 +48,8 @@ extern "C" {
 #endif
 
 
+/** Opaque type */
+struct pipe_fence_handle;
 
 /**
  * Gallium screen/adapter context.  Basically everything
@@ -128,7 +130,108 @@ struct pipe_screen {
 
    void (*surface_unmap)( struct pipe_screen *,
                           struct pipe_surface *surface );
-   
+
+
+   /**
+    * Buffer management. Buffer attributes are mostly fixed over its lifetime.
+    *
+    */
+   struct pipe_buffer *(*buffer_create)( struct pipe_screen *screen,
+                                         unsigned alignment,
+                                         unsigned usage,
+                                         unsigned size );
+
+   /**
+    * Create a buffer that wraps user-space data.
+    *
+    * Effectively this schedules a delayed call to buffer_create
+    * followed by an upload of the data at *some point in the future*,
+    * or perhaps never.  Basically the allocate/upload is delayed
+    * until the buffer is actually passed to hardware.
+    *
+    * The intention is to provide a quick way to turn regular data
+    * into a buffer, and secondly to avoid a copy operation if that
+    * data subsequently turns out to be only accessed by the CPU.
+    *
+    * Common example is OpenGL vertex buffers that are subsequently
+    * processed either by software TNL in the driver or by passing to
+    * hardware.
+    *
+    * XXX: What happens if the delayed call to buffer_create() fails?
+    *
+    * Note that ptr may be accessed at any time upto the time when the
+    * buffer is destroyed, so the data must not be freed before then.
+    */
+   struct pipe_buffer *(*user_buffer_create)(struct pipe_screen *screen,
+                                             void *ptr,
+                                             unsigned bytes);
+
+   /**
+    * Allocate storage for a display target surface.
+    *
+    * Often surfaces which are meant to be blitted to the front screen (i.e.,
+    * display targets) must be allocated with special characteristics, memory
+    * pools, or obtained directly from the windowing system.
+    *
+    * This callback is invoked by the pipe_screenwhen creating a texture marked
+    * with the PIPE_TEXTURE_USAGE_DISPLAY_TARGET flag  to get the underlying
+    * buffer storage.
+    */
+   struct pipe_buffer *(*surface_buffer_create)(struct pipe_screen *screen,
+						unsigned width, unsigned height,
+						enum pipe_format format,
+						unsigned usage,
+						unsigned *stride);
+
+
+   /**
+    * Map the entire data store of a buffer object into the client's address.
+    * flags is bitmask of PIPE_BUFFER_USAGE_CPU_READ/WRITE flags.
+    */
+   void *(*buffer_map)( struct pipe_screen *screen,
+			struct pipe_buffer *buf,
+			unsigned usage );
+
+   void (*buffer_unmap)( struct pipe_screen *screen,
+			 struct pipe_buffer *buf );
+
+   void (*buffer_destroy)( struct pipe_screen *screen,
+			   struct pipe_buffer *buf );
+
+
+   /**
+    * Do any special operations to ensure frontbuffer contents are
+    * displayed, eg copy fake frontbuffer.
+    */
+   void (*flush_frontbuffer)( struct pipe_screen *screen,
+                              struct pipe_surface *surf,
+                              void *context_private );
+
+
+
+   /** Set ptr = fence, with reference counting */
+   void (*fence_reference)( struct pipe_screen *screen,
+                            struct pipe_fence_handle **ptr,
+                            struct pipe_fence_handle *fence );
+
+   /**
+    * Checks whether the fence has been signalled.
+    * \param flags  driver-specific meaning
+    * \return zero on success.
+    */
+   int (*fence_signalled)( struct pipe_screen *screen,
+                           struct pipe_fence_handle *fence,
+                           unsigned flag );
+
+   /**
+    * Wait for the fence to finish.
+    * \param flags  driver-specific meaning
+    * \return zero on success.
+    */
+   int (*fence_finish)( struct pipe_screen *screen,
+                        struct pipe_fence_handle *fence,
+                        unsigned flag );
+
 };
 
 
diff --git a/src/gallium/state_trackers/egl/egl_context.c b/src/gallium/state_trackers/egl/egl_context.c
index 217fe00338e..8564972b91e 100644
--- a/src/gallium/state_trackers/egl/egl_context.c
+++ b/src/gallium/state_trackers/egl/egl_context.c
@@ -10,7 +10,6 @@
 
 #include "pipe/p_context.h"
 #include "pipe/p_screen.h"
-#include "pipe/p_winsys.h"
 
 #include "state_tracker/st_public.h"
 #include "state_tracker/drm_api.h"
diff --git a/src/gallium/state_trackers/egl/egl_tracker.c b/src/gallium/state_trackers/egl/egl_tracker.c
index 3ca5acb68bf..dec82c3a002 100644
--- a/src/gallium/state_trackers/egl/egl_tracker.c
+++ b/src/gallium/state_trackers/egl/egl_tracker.c
@@ -10,7 +10,7 @@
 #include "state_tracker/drm_api.h"
 
 #include "pipe/p_screen.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 
 /** HACK */
 void* driDriverAPI;
diff --git a/src/gallium/state_trackers/g3dvl/vl_basic_csc.c b/src/gallium/state_trackers/g3dvl/vl_basic_csc.c
index 53ef2753496..122c42ed0e6 100644
--- a/src/gallium/state_trackers/g3dvl/vl_basic_csc.c
+++ b/src/gallium/state_trackers/g3dvl/vl_basic_csc.c
@@ -2,7 +2,6 @@
 #include "vl_basic_csc.h"
 #include <assert.h>
 #include <pipe/p_context.h>
-#include <pipe/p_winsys.h>
 #include <pipe/p_state.h>
 #include <pipe/p_inlines.h>
 #include <tgsi/tgsi_parse.h>
diff --git a/src/gallium/state_trackers/g3dvl/vl_r16snorm_mc_buf.c b/src/gallium/state_trackers/g3dvl/vl_r16snorm_mc_buf.c
index 789042f6f21..d53482f5794 100644
--- a/src/gallium/state_trackers/g3dvl/vl_r16snorm_mc_buf.c
+++ b/src/gallium/state_trackers/g3dvl/vl_r16snorm_mc_buf.c
@@ -2,7 +2,6 @@
 #include "vl_r16snorm_mc_buf.h"
 #include <assert.h>
 #include <pipe/p_context.h>
-#include <pipe/p_winsys.h>
 #include <pipe/p_screen.h>
 #include <pipe/p_state.h>
 #include <pipe/p_inlines.h>
@@ -649,9 +648,9 @@ static int vlFlush
 
 	pipe->set_framebuffer_state(pipe, &mc->render_target);
 	pipe->set_viewport_state(pipe, &mc->viewport);
-	vs_consts = pipe->winsys->buffer_map
+	vs_consts = pipe_buffer_map
 	(
-		pipe->winsys,
+		pipe->screen,
 		mc->vs_const_buf.buffer,
 		PIPE_BUFFER_USAGE_CPU_WRITE | PIPE_BUFFER_USAGE_DISCARD
 	);
diff --git a/src/gallium/state_trackers/python/st_device.c b/src/gallium/state_trackers/python/st_device.c
index 95c1378a032..20dd8d269d9 100644
--- a/src/gallium/state_trackers/python/st_device.c
+++ b/src/gallium/state_trackers/python/st_device.c
@@ -26,7 +26,7 @@
  **************************************************************************/
 
 
-#include "pipe/p_winsys.h"
+#include "pipe/p_screen.h"
 #include "pipe/p_context.h"
 #include "pipe/p_shader_tokens.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/state_trackers/python/st_softpipe_winsys.c b/src/gallium/state_trackers/python/st_softpipe_winsys.c
index 01d88ee499d..4d798df99bf 100644
--- a/src/gallium/state_trackers/python/st_softpipe_winsys.c
+++ b/src/gallium/state_trackers/python/st_softpipe_winsys.c
@@ -36,7 +36,7 @@
  */
 
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"/* port to just p_screen */
 #include "pipe/p_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/winsys/drm/intel/common/intel_be_device.c b/src/gallium/winsys/drm/intel/common/intel_be_device.c
index 14aeaf61dbf..85ab1a26846 100644
--- a/src/gallium/winsys/drm/intel/common/intel_be_device.c
+++ b/src/gallium/winsys/drm/intel/common/intel_be_device.c
@@ -10,7 +10,7 @@
 #include "ws_dri_bufpool.h"
 #include "ws_dri_fencemgr.h"
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_state.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/winsys/drm/intel/common/intel_be_device.h b/src/gallium/winsys/drm/intel/common/intel_be_device.h
index 3f8b3f585c7..534d638b6a8 100644
--- a/src/gallium/winsys/drm/intel/common/intel_be_device.h
+++ b/src/gallium/winsys/drm/intel/common/intel_be_device.h
@@ -1,7 +1,7 @@
 #ifndef INTEL_DRM_DEVICE_H
 #define INTEL_DRM_DEVICE_H
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_context.h"
 
 /*
diff --git a/src/gallium/winsys/drm/intel/gem/intel_be_device.c b/src/gallium/winsys/drm/intel/gem/intel_be_device.c
index 5406636bcb7..82c1cb2f32a 100644
--- a/src/gallium/winsys/drm/intel/gem/intel_be_device.c
+++ b/src/gallium/winsys/drm/intel/gem/intel_be_device.c
@@ -1,7 +1,7 @@
 
 #include "intel_be_device.h"
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_state.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/winsys/drm/intel/gem/intel_be_device.h b/src/gallium/winsys/drm/intel/gem/intel_be_device.h
index 96e94c47e71..f06890163cc 100644
--- a/src/gallium/winsys/drm/intel/gem/intel_be_device.h
+++ b/src/gallium/winsys/drm/intel/gem/intel_be_device.h
@@ -2,7 +2,7 @@
 #ifndef INTEL_DRM_DEVICE_H
 #define INTEL_DRM_DEVICE_H
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_context.h"
 
 #include "drm.h"
diff --git a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.c b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.c
index 5b3101fbba9..8e889b9f369 100644
--- a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.c
+++ b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.c
@@ -1,4 +1,4 @@
-#include <pipe/p_winsys.h>
+#include "pipe/internal/p_winsys_screen.h"
 #include <pipe/p_defines.h>
 #include <pipe/p_inlines.h>
 #include <util/u_memory.h>
diff --git a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.h b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.h
index 14c728690d4..d97ffdf3373 100644
--- a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.h
+++ b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_pipe.h
@@ -2,7 +2,7 @@
 #define NOUVEAU_PIPE_WINSYS_H
 
 #include "pipe/p_context.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "nouveau_context.h"
 
 struct nouveau_pipe_buffer {
diff --git a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_softpipe.c b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_softpipe.c
index 04def600f45..396e4f2a2e6 100644
--- a/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_softpipe.c
+++ b/src/gallium/winsys/drm/nouveau/common/nouveau_winsys_softpipe.c
@@ -29,7 +29,7 @@
  * Authors: Keith Whitwell <keithw-at-tungstengraphics-dot-com>
  */
 
-#include <pipe/p_winsys.h>
+#include "pipe/internal/p_winsys_screen.h"
 #include <pipe/p_screen.h>
 #include <pipe/p_defines.h>
 #include <pipe/p_format.h>
diff --git a/src/gallium/winsys/egl_xlib/egl_xlib.c b/src/gallium/winsys/egl_xlib/egl_xlib.c
index 82aa60ae58f..4876339107a 100644
--- a/src/gallium/winsys/egl_xlib/egl_xlib.c
+++ b/src/gallium/winsys/egl_xlib/egl_xlib.c
@@ -38,7 +38,7 @@
 #include "pipe/p_compiler.h"
 #include "pipe/p_format.h"
 #include "pipe/p_state.h"
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "util/u_memory.h"
 #include "softpipe/sp_winsys.h"
 
diff --git a/src/gallium/winsys/egl_xlib/sw_winsys.c b/src/gallium/winsys/egl_xlib/sw_winsys.c
index a09ad5e8e90..739bfa1c1a6 100644
--- a/src/gallium/winsys/egl_xlib/sw_winsys.c
+++ b/src/gallium/winsys/egl_xlib/sw_winsys.c
@@ -35,7 +35,7 @@
  */
 
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_state.h"
 #include "pipe/p_inlines.h"
 #include "util/u_math.h"
diff --git a/src/gallium/winsys/gdi/gdi_softpipe_winsys.c b/src/gallium/winsys/gdi/gdi_softpipe_winsys.c
index cc120071937..1abe84b6a01 100644
--- a/src/gallium/winsys/gdi/gdi_softpipe_winsys.c
+++ b/src/gallium/winsys/gdi/gdi_softpipe_winsys.c
@@ -38,7 +38,7 @@
 
 #include <windows.h>
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_inlines.h"
@@ -268,7 +268,7 @@ gdi_softpipe_context_create(struct pipe_screen *screen)
 
 
 static void
-gdi_softpipe_flush_frontbuffer(struct pipe_winsys *winsys,
+gdi_softpipe_flush_frontbuffer(struct pipe_screen *screen,
                                struct pipe_surface *surface,
                                HDC hDC)
 {
diff --git a/src/gallium/winsys/xlib/xlib_brw_context.c b/src/gallium/winsys/xlib/xlib_brw_context.c
index 528473925ad..09599507f44 100644
--- a/src/gallium/winsys/xlib/xlib_brw_context.c
+++ b/src/gallium/winsys/xlib/xlib_brw_context.c
@@ -36,7 +36,7 @@
 //#include "glxheader.h"
 //#include "xmesaP.h"
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
diff --git a/src/gallium/winsys/xlib/xlib_brw_screen.c b/src/gallium/winsys/xlib/xlib_brw_screen.c
index 1fd7da8a2f5..5344c502ef7 100644
--- a/src/gallium/winsys/xlib/xlib_brw_screen.c
+++ b/src/gallium/winsys/xlib/xlib_brw_screen.c
@@ -36,7 +36,7 @@
 //#include "state_trackers/xlib/glxheader.h"
 //#include "state_trackers/xlib/xmesaP.h"
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_inlines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
diff --git a/src/gallium/winsys/xlib/xlib_cell.c b/src/gallium/winsys/xlib/xlib_cell.c
index 5af9ee3bb50..bf69593c5ca 100644
--- a/src/gallium/winsys/xlib/xlib_cell.c
+++ b/src/gallium/winsys/xlib/xlib_cell.c
@@ -41,7 +41,7 @@
 #undef ASSERT
 #undef Elements
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_inlines.h"
diff --git a/src/gallium/winsys/xlib/xlib_softpipe.c b/src/gallium/winsys/xlib/xlib_softpipe.c
index c0bf37050a4..01d24584e2b 100644
--- a/src/gallium/winsys/xlib/xlib_softpipe.c
+++ b/src/gallium/winsys/xlib/xlib_softpipe.c
@@ -38,7 +38,7 @@
 #undef ASSERT
 #undef Elements
 
-#include "pipe/p_winsys.h"
+#include "pipe/internal/p_winsys_screen.h"
 #include "pipe/p_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_inlines.h"
diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 0c69e166233..d18946de7dc 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -42,7 +42,7 @@
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/p_screen.h"
 #include "st_context.h"
 #include "st_cb_fbo.h"
 #include "st_cb_texture.h"
diff --git a/src/mesa/state_tracker/st_cb_feedback.c b/src/mesa/state_tracker/st_cb_feedback.c
index 19021411cfc..c7e8aa7cc56 100644
--- a/src/mesa/state_tracker/st_cb_feedback.c
+++ b/src/mesa/state_tracker/st_cb_feedback.c
@@ -52,7 +52,6 @@
 
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
 #include "cso_cache/cso_cache.h"
 
 #include "draw/draw_context.h"
diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index 072f2e92ad7..f8621ab125f 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -42,7 +42,7 @@
 #include "st_public.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
-#include "pipe/p_winsys.h"
+#include "pipe/p_screen.h"
 #include "util/u_gen_mipmap.h"
 #include "util/u_blit.h"
 
@@ -55,7 +55,7 @@ is_front_buffer_dirty(struct st_context *st)
 
 
 /**
- * Tell the winsys to display the front color buffer on-screen.
+ * Tell the screen to display the front color buffer on-screen.
  */
 static void
 display_front_buffer(struct st_context *st)
@@ -67,7 +67,7 @@ display_front_buffer(struct st_context *st)
 
    /* Hook for copying "fake" frontbuffer if necessary:
     */
-   st->pipe->winsys->flush_frontbuffer( st->pipe->winsys, front_surf,
+   st->pipe->screen->flush_frontbuffer( st->pipe->screen, front_surf,
                                         st->pipe->priv );
 
    /*
@@ -103,8 +103,8 @@ void st_finish( struct st_context *st )
    st_flush(st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
 
    if(fence) {
-      st->pipe->winsys->fence_finish(st->pipe->winsys, fence, 0);
-      st->pipe->winsys->fence_reference(st->pipe->winsys, &fence, NULL);
+      st->pipe->screen->fence_finish(st->pipe->screen, fence, 0);
+      st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
    }
 }
 
diff --git a/src/mesa/state_tracker/st_cb_strings.c b/src/mesa/state_tracker/st_cb_strings.c
index 09545aa8fb8..2036ccafbfb 100644
--- a/src/mesa/state_tracker/st_cb_strings.c
+++ b/src/mesa/state_tracker/st_cb_strings.c
@@ -36,7 +36,6 @@
 #include "main/version.h"
 #include "pipe/p_context.h"
 #include "pipe/p_screen.h"
-#include "pipe/p_winsys.h"
 #include "st_context.h"
 #include "st_cb_strings.h"
 
@@ -67,10 +66,9 @@ st_get_string(GLcontext * ctx, GLenum name)
    }
 
    case GL_RENDERER:
-      util_snprintf(st->renderer, sizeof(st->renderer), "Gallium %s, %s on %s", 
+      util_snprintf(st->renderer, sizeof(st->renderer), "Gallium %s on %s", 
                ST_VERSION_STRING,
-	       screen->get_name( screen ),
-	       screen->winsys->get_name( screen->winsys ));
+	       screen->get_name( screen ));
 
       return (GLubyte *) st->renderer;
 
diff --git a/src/mesa/state_tracker/wgl/stw_device.c b/src/mesa/state_tracker/wgl/stw_device.c
index 129b24ce777..4c2fb5c61b6 100644
--- a/src/mesa/state_tracker/wgl/stw_device.c
+++ b/src/mesa/state_tracker/wgl/stw_device.c
@@ -28,7 +28,6 @@
 #include <windows.h>
 
 #include "pipe/p_debug.h"
-#include "pipe/p_winsys.h"
 #include "pipe/p_screen.h"
 
 #include "stw_device.h"
@@ -40,19 +39,18 @@ struct stw_device *stw_dev = NULL;
 
 
 /**
- * XXX: Dispatch pipe_winsys::flush_front_buffer to our 
+ * XXX: Dispatch pipe_screen::flush_front_buffer to our 
  * stw_winsys::flush_front_buffer.
  */
 static void 
-st_flush_frontbuffer(struct pipe_winsys *ws,
+st_flush_frontbuffer(struct pipe_screen *screen,
                      struct pipe_surface *surf,
                      void *context_private )
 {
    const struct stw_winsys *stw_winsys = stw_dev->stw_winsys;
-   struct pipe_winsys *winsys = stw_dev->screen->winsys;
    HDC hdc = (HDC)context_private;
    
-   stw_winsys->flush_frontbuffer(winsys, surf, hdc);
+   stw_winsys->flush_frontbuffer(screen, surf, hdc);
 }
 
 
@@ -72,8 +70,7 @@ st_init(const struct stw_winsys *stw_winsys)
    if(!stw_dev->screen)
       goto error1;
 
-   /* XXX: pipe_winsys::flush_frontbuffer should go away */
-   stw_dev->screen->winsys->flush_frontbuffer = st_flush_frontbuffer;
+   stw_dev->screen->flush_frontbuffer = st_flush_frontbuffer;
    
    pixelformat_init();
 
diff --git a/src/mesa/state_tracker/wgl/stw_wgl_swapbuffers.c b/src/mesa/state_tracker/wgl/stw_wgl_swapbuffers.c
index 002bcc64e72..41bfeadfb1b 100644
--- a/src/mesa/state_tracker/wgl/stw_wgl_swapbuffers.c
+++ b/src/mesa/state_tracker/wgl/stw_wgl_swapbuffers.c
@@ -27,7 +27,6 @@
 
 #include <windows.h>
 
-#include "pipe/p_winsys.h"
 #include "pipe/p_screen.h"
 #include "pipe/p_context.h"
 #include "state_tracker/st_context.h"
@@ -55,7 +54,7 @@ wglSwapBuffers(
 
    st_get_framebuffer_surface( fb->stfb, ST_SURFACE_BACK_LEFT, &surf );
 
-   stw_dev->stw_winsys->flush_frontbuffer(stw_dev->screen->winsys,
+   stw_dev->stw_winsys->flush_frontbuffer(stw_dev->screen,
                                           surf,
                                           hdc );
 
diff --git a/src/mesa/state_tracker/wgl/stw_winsys.h b/src/mesa/state_tracker/wgl/stw_winsys.h
index 8557327ccdd..a85a9a22577 100644
--- a/src/mesa/state_tracker/wgl/stw_winsys.h
+++ b/src/mesa/state_tracker/wgl/stw_winsys.h
@@ -34,7 +34,6 @@
 
 struct pipe_screen;
 struct pipe_context;
-struct pipe_winsys;
 struct pipe_surface;
 
 struct stw_winsys
@@ -46,7 +45,7 @@ struct stw_winsys
    (*create_context)( struct pipe_screen *screen );
 
    void
-   (*flush_frontbuffer)( struct pipe_winsys *winsys,
+   (*flush_frontbuffer)( struct pipe_screen *screen,
                          struct pipe_surface *surf,
                          HDC hDC );
 };