softpipe: rework to use the llvmpipe winsys

Promote the llvmpipe winsys more or less unchanged to
state_trackers/sw_winsys.h.

Some minor breakages:
  - softpipe::texture_blanket is broken, but scheduled for removal anyway.
  - haven't fixed up g3vdl yet.

12 files changed, 282 insertions, 458 deletions

diff --git a/src/gallium/drivers/softpipe/Makefile b/src/gallium/drivers/softpipe/Makefile
index e4ac49fa85..1c6e4ae076 100644
--- a/src/gallium/drivers/softpipe/Makefile
+++ b/src/gallium/drivers/softpipe/Makefile
@@ -6,6 +6,7 @@ LIBNAME = softpipe
 C_SOURCES = \
 	sp_fs_exec.c \
 	sp_fs_sse.c \
+	sp_buffer.c \
 	sp_clear.c \
 	sp_flush.c \
 	sp_query.c \
@@ -32,7 +33,6 @@ C_SOURCES = \
 	sp_tex_tile_cache.c \
 	sp_tile_cache.c \
 	sp_surface.c \
-	sp_video_context.c \
-	sp_winsys.c
+	sp_video_context.c
 
 include ../../Makefile.template
diff --git a/src/gallium/drivers/softpipe/SConscript b/src/gallium/drivers/softpipe/SConscript
index 3042e556c6..27ab00b036 100644
--- a/src/gallium/drivers/softpipe/SConscript
+++ b/src/gallium/drivers/softpipe/SConscript
@@ -7,6 +7,7 @@ softpipe = env.ConvenienceLibrary(
 	source = [
 		'sp_fs_exec.c',
 		'sp_fs_sse.c',
+		'sp_buffer.c',
 		'sp_clear.c',
 		'sp_context.c',
 		'sp_draw_arrays.c',
@@ -33,8 +34,7 @@ softpipe = env.ConvenienceLibrary(
 		'sp_tex_tile_cache.c',
 		'sp_texture.c',
 		'sp_tile_cache.c',
-		'sp_video_context.c',
-		'sp_winsys.c'
+		'sp_video_context.c'
 	])
 
 Export('softpipe')
diff --git a/src/gallium/drivers/softpipe/sp_buffer.c b/src/gallium/drivers/softpipe/sp_buffer.c
new file mode 100644
index 0000000000..8f39025086
--- /dev/null
+++ b/src/gallium/drivers/softpipe/sp_buffer.c
@@ -0,0 +1,118 @@
+/**************************************************************************
+ *
+ * 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 VMWARE 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 "util/u_inlines.h"
+#include "util/u_memory.h"
+#include "util/u_math.h"
+
+#include "sp_screen.h"
+#include "sp_buffer.h"
+
+
+static void *
+softpipe_buffer_map(struct pipe_screen *screen,
+                    struct pipe_buffer *buf,
+                    unsigned flags)
+{
+   struct softpipe_buffer *softpipe_buf = softpipe_buffer(buf);
+   return softpipe_buf->data;
+}
+
+
+static void
+softpipe_buffer_unmap(struct pipe_screen *screen,
+                      struct pipe_buffer *buf)
+{
+}
+
+
+static void
+softpipe_buffer_destroy(struct pipe_buffer *buf)
+{
+   struct softpipe_buffer *sbuf = softpipe_buffer(buf);
+
+   if (!sbuf->userBuffer)
+      align_free(sbuf->data);
+      
+   FREE(sbuf);
+}
+
+
+static struct pipe_buffer *
+softpipe_buffer_create(struct pipe_screen *screen,
+                       unsigned alignment,
+                       unsigned usage,
+                       unsigned size)
+{
+   struct softpipe_buffer *buffer = CALLOC_STRUCT(softpipe_buffer);
+
+   pipe_reference_init(&buffer->base.reference, 1);
+   buffer->base.screen = screen;
+   buffer->base.alignment = MAX2(alignment, 16);
+   buffer->base.usage = usage;
+   buffer->base.size = size;
+
+   buffer->data = align_malloc(size, alignment);
+
+   return &buffer->base;
+}
+
+
+/**
+ * Create buffer which wraps user-space data.
+ */
+static struct pipe_buffer *
+softpipe_user_buffer_create(struct pipe_screen *screen,
+                            void *ptr,
+                            unsigned bytes)
+{
+   struct softpipe_buffer *buffer;
+
+   buffer = CALLOC_STRUCT(softpipe_buffer);
+   if(!buffer)
+      return NULL;
+
+   pipe_reference_init(&buffer->base.reference, 1);
+   buffer->base.screen = screen;
+   buffer->base.size = bytes;
+   buffer->userBuffer = TRUE;
+   buffer->data = ptr;
+
+   return &buffer->base;
+}
+
+
+void
+softpipe_init_screen_buffer_funcs(struct pipe_screen *screen)
+{
+   screen->buffer_create = softpipe_buffer_create;
+   screen->user_buffer_create = softpipe_user_buffer_create;
+   screen->buffer_map = softpipe_buffer_map;
+   screen->buffer_unmap = softpipe_buffer_unmap;
+   screen->buffer_destroy = softpipe_buffer_destroy;
+}
diff --git a/src/gallium/drivers/softpipe/sp_winsys.h b/src/gallium/drivers/softpipe/sp_buffer.h
index 6e3920c49b..9d8e56a176 100644
--- a/src/gallium/drivers/softpipe/sp_winsys.h
+++ b/src/gallium/drivers/softpipe/sp_buffer.h
@@ -1,8 +1,8 @@
 /**************************************************************************
- * 
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ *
+ * 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
@@ -10,64 +10,46 @@
  * 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
+ * IN NO EVENT SHALL VMWARE 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.
- * 
+ *
  **************************************************************************/
 
-/* This is the interface that softpipe requires any window system
- * hosting it to implement.  This is the only include file in softpipe
- * which is public.
- */
+#ifndef SP_BUFFER_H
+#define SP_BUFFER_H
 
+#include "pipe/p_compiler.h"
+#include "pipe/p_state.h"
 
-#ifndef SP_WINSYS_H
-#define SP_WINSYS_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+struct softpipe_buffer
+{
+   struct pipe_buffer base;
+   boolean userBuffer;  /** Is this a user-space buffer? */
+   void *data;
+};
 
-#include "pipe/p_defines.h"
 
-struct pipe_screen;
-struct pipe_winsys;
-struct pipe_context;
-struct pipe_texture;
-struct pipe_buffer;
-
-
-
-/**
- * Create a softpipe screen that uses the
- * given winsys for allocating buffers.
- */
-struct pipe_screen *softpipe_create_screen( struct pipe_winsys * );
-
-/**
- * Create a softpipe screen that uses
- * regular malloc to create all its buffers.
- */
-struct pipe_screen *softpipe_create_screen_malloc(void);
+/** Cast wrapper */
+static INLINE struct softpipe_buffer *
+softpipe_buffer( struct pipe_buffer *buf )
+{
+   return (struct softpipe_buffer *)buf;
+}
 
-boolean
-softpipe_get_texture_buffer( struct pipe_texture *texture,
-                             struct pipe_buffer **buf,
-                             unsigned *stride );
 
+void
+softpipe_init_screen_buffer_funcs(struct pipe_screen *screen);
 
-#ifdef __cplusplus
-}
-#endif
 
-#endif /* SP_WINSYS_H */
+#endif /* SP_BUFFER_H */
diff --git a/src/gallium/drivers/softpipe/sp_context.c b/src/gallium/drivers/softpipe/sp_context.c
index ddc35bcd62..53eecd1cbf 100644
--- a/src/gallium/drivers/softpipe/sp_context.c
+++ b/src/gallium/drivers/softpipe/sp_context.c
@@ -210,7 +210,7 @@ softpipe_create_context( struct pipe_screen *screen,
    softpipe->dump_fs = debug_get_bool_option( "GALLIUM_DUMP_FS", FALSE );
    softpipe->dump_gs = debug_get_bool_option( "SOFTPIPE_DUMP_GS", FALSE );
 
-   softpipe->pipe.winsys = screen->winsys;
+   softpipe->pipe.winsys = NULL;
    softpipe->pipe.screen = screen;
    softpipe->pipe.destroy = softpipe_destroy;
    softpipe->pipe.priv = priv;
diff --git a/src/gallium/drivers/softpipe/sp_draw_arrays.c b/src/gallium/drivers/softpipe/sp_draw_arrays.c
index b2acc36bf7..0899e1145a 100644
--- a/src/gallium/drivers/softpipe/sp_draw_arrays.c
+++ b/src/gallium/drivers/softpipe/sp_draw_arrays.c
@@ -40,83 +40,13 @@
 #include "sp_context.h"
 #include "sp_query.h"
 #include "sp_state.h"
+#include "sp_buffer.h"
 
 #include "draw/draw_context.h"
 
 
 
-static void
-softpipe_map_constant_buffers(struct softpipe_context *sp)
-{
-   struct pipe_winsys *ws = sp->pipe.winsys;
-   uint i;
-
-   for (i = 0; i < PIPE_SHADER_TYPES; i++) {
-      uint j;
-
-      for (j = 0; j < PIPE_MAX_CONSTANT_BUFFERS; j++) {
-         if (sp->constants[i][j] && sp->constants[i][j]->size) {
-            sp->mapped_constants[i][j] = ws->buffer_map(ws,
-                                                        sp->constants[i][j],
-                                                        PIPE_BUFFER_USAGE_CPU_READ);
-         }
-      }
-   }
-
-   for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
-      if (sp->constants[PIPE_SHADER_VERTEX][i]) {
-         draw_set_mapped_constant_buffer(sp->draw,
-                                         PIPE_SHADER_VERTEX,
-                                         i,
-                                         sp->mapped_constants[PIPE_SHADER_VERTEX][i],
-                                         sp->constants[PIPE_SHADER_VERTEX][i]->size);
-      }
-      if (sp->constants[PIPE_SHADER_GEOMETRY][i]) {
-         draw_set_mapped_constant_buffer(sp->draw,
-                                         PIPE_SHADER_GEOMETRY,
-                                         i,
-                                         sp->mapped_constants[PIPE_SHADER_GEOMETRY][i],
-                                         sp->constants[PIPE_SHADER_GEOMETRY][i]->size);
-      }
-   }
-}
-
-
-static void
-softpipe_unmap_constant_buffers(struct softpipe_context *sp)
-{
-   struct pipe_winsys *ws = sp->pipe.winsys;
-   uint i;
 
-   /* really need to flush all prims since the vert/frag shaders const buffers
-    * are going away now.
-    */
-   draw_flush(sp->draw);
-
-   for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
-      draw_set_mapped_constant_buffer(sp->draw,
-                                      PIPE_SHADER_VERTEX,
-                                      i,
-                                      NULL,
-                                      0);
-      draw_set_mapped_constant_buffer(sp->draw,
-                                      PIPE_SHADER_GEOMETRY,
-                                      i,
-                                      NULL,
-                                      0);
-   }
-
-   for (i = 0; i < PIPE_SHADER_TYPES; i++) {
-      uint j;
-
-      for (j = 0; j < PIPE_MAX_CONSTANT_BUFFERS; j++) {
-         if (sp->constants[i][j] && sp->constants[i][j]->size) {
-            ws->buffer_unmap(ws, sp->constants[i][j]);
-         }
-         sp->mapped_constants[i][j] = NULL;
-      }
-   }
-}
 
 
 /**
@@ -261,25 +191,16 @@ softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
    }
 
    softpipe_map_transfers(sp);
-   softpipe_map_constant_buffers(sp);
 
    /* Map vertex buffers */
    for (i = 0; i < sp->num_vertex_buffers; i++) {
-      void *buf;
-
-      buf = pipe_buffer_map(pipe->screen,
-                            sp->vertex_buffer[i].buffer,
-                            PIPE_BUFFER_USAGE_CPU_READ);
+      void *buf = softpipe_buffer(sp->vertex_buffer[i].buffer)->data;
       draw_set_mapped_vertex_buffer(draw, i, buf);
    }
 
    /* Map index buffer, if present */
    if (indexBuffer) {
-      void *mapped_indexes;
-
-      mapped_indexes = pipe_buffer_map(pipe->screen,
-                                       indexBuffer,
-                                       PIPE_BUFFER_USAGE_CPU_READ);
+      void *mapped_indexes = softpipe_buffer(indexBuffer)->data;
       draw_set_mapped_element_buffer_range(draw,
                                            indexSize,
                                            minIndex,
@@ -300,15 +221,18 @@ softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
    /* unmap vertex/index buffers - will cause draw module to flush */
    for (i = 0; i < sp->num_vertex_buffers; i++) {
       draw_set_mapped_vertex_buffer(draw, i, NULL);
-      pipe_buffer_unmap(pipe->screen, sp->vertex_buffer[i].buffer);
    }
    if (indexBuffer) {
       draw_set_mapped_element_buffer(draw, 0, NULL);
-      pipe_buffer_unmap(pipe->screen, indexBuffer);
    }
 
-   /* Note: leave drawing surfaces mapped */
-   softpipe_unmap_constant_buffers(sp);
+   /*
+    * TODO: Flush only when a user vertex/index buffer is present
+    * (or even better, modify draw module to do this
+    * internally when this condition is seen?)
+    */
+   draw_flush(draw);
 
+   /* Note: leave drawing surfaces mapped */
    sp->dirty_render_cache = TRUE;
 }
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 6ec63fe698..107631f6b5 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -32,10 +32,12 @@
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
 
+#include "state_tracker/sw_winsys.h"
+
 #include "sp_texture.h"
-#include "sp_winsys.h"
 #include "sp_screen.h"
 #include "sp_context.h"
+#include "sp_buffer.h"
 
 
 static const char *
@@ -145,6 +147,8 @@ softpipe_is_format_supported( struct pipe_screen *screen,
                               unsigned tex_usage, 
                               unsigned geom_flags )
 {
+   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
+
    assert(target == PIPE_TEXTURE_1D ||
           target == PIPE_TEXTURE_2D ||
           target == PIPE_TEXTURE_3D ||
@@ -166,15 +170,25 @@ softpipe_is_format_supported( struct pipe_screen *screen,
    case PIPE_FORMAT_NONE:
       return FALSE;
    default:
-      return TRUE;
+      break;
    }
+
+   if(tex_usage & PIPE_TEXTURE_USAGE_DISPLAY_TARGET) {
+      if(!winsys->is_displaytarget_format_supported(winsys, format))
+         return FALSE;
+   }
+
+   /* XXX: this is often a lie.  Pull in logic from llvmpipe to fix.
+    */
+   return TRUE;
 }
 
 
 static void
 softpipe_destroy_screen( struct pipe_screen *screen )
 {
-   struct pipe_winsys *winsys = screen->winsys;
+   struct softpipe_screen *sp_screen = softpipe_screen(screen);
+   struct sw_winsys *winsys = sp_screen->winsys;
 
    if(winsys->destroy)
       winsys->destroy(winsys);
@@ -183,21 +197,37 @@ softpipe_destroy_screen( struct pipe_screen *screen )
 }
 
 
+/* This is often overriden by the co-state tracker.
+ */
+static void
+softpipe_flush_frontbuffer(struct pipe_screen *_screen,
+                           struct pipe_surface *surface,
+                           void *context_private)
+{
+   struct softpipe_screen *screen = softpipe_screen(_screen);
+   struct sw_winsys *winsys = screen->winsys;
+   struct softpipe_texture *texture = softpipe_texture(surface->texture);
+
+   assert(texture->dt);
+   if (texture->dt)
+      winsys->displaytarget_display(winsys, texture->dt, context_private);
+}
 
 /**
  * Create a new pipe_screen object
  * Note: we're not presently subclassing pipe_screen (no softpipe_screen).
  */
 struct pipe_screen *
-softpipe_create_screen(struct pipe_winsys *winsys)
+softpipe_create_screen(struct sw_winsys *winsys)
 {
    struct softpipe_screen *screen = CALLOC_STRUCT(softpipe_screen);
 
    if (!screen)
       return NULL;
 
-   screen->base.winsys = winsys;
+   screen->winsys = winsys;
 
+   screen->base.winsys = NULL;
    screen->base.destroy = softpipe_destroy_screen;
 
    screen->base.get_name = softpipe_get_name;
@@ -206,9 +236,10 @@ softpipe_create_screen(struct pipe_winsys *winsys)
    screen->base.get_paramf = softpipe_get_paramf;
    screen->base.is_format_supported = softpipe_is_format_supported;
    screen->base.context_create = softpipe_create_context;
+   screen->base.flush_frontbuffer = softpipe_flush_frontbuffer;
 
    softpipe_init_screen_texture_funcs(&screen->base);
-   u_simple_screen_init(&screen->base);
+   softpipe_init_screen_buffer_funcs(&screen->base);
 
    return &screen->base;
 }
diff --git a/src/gallium/drivers/softpipe/sp_screen.h b/src/gallium/drivers/softpipe/sp_screen.h
index 3d4bfd3e84..4d7d8bada2 100644
--- a/src/gallium/drivers/softpipe/sp_screen.h
+++ b/src/gallium/drivers/softpipe/sp_screen.h
@@ -35,10 +35,13 @@
 #include "pipe/p_defines.h"
 
 
+struct sw_winsys;
 
 struct softpipe_screen {
    struct pipe_screen base;
 
+   struct sw_winsys *winsys;
+
    /* Increments whenever textures are modified.  Contexts can track
     * this.
     */
@@ -55,4 +58,13 @@ softpipe_screen( struct pipe_screen *pipe )
 }
 
 
+
+/**
+ * Create a softpipe screen that uses the
+ * given winsys for allocating buffers.
+ */
+struct pipe_screen *softpipe_create_screen( struct sw_winsys * );
+
+
+
 #endif /* SP_SCREEN_H */
diff --git a/src/gallium/drivers/softpipe/sp_state_fs.c b/src/gallium/drivers/softpipe/sp_state_fs.c
index c88e213751..cd0e905bc9 100644
--- a/src/gallium/drivers/softpipe/sp_state_fs.c
+++ b/src/gallium/drivers/softpipe/sp_state_fs.c
@@ -28,6 +28,7 @@
 #include "sp_context.h"
 #include "sp_state.h"
 #include "sp_fs.h"
+#include "sp_buffer.h"
 
 #include "pipe/p_defines.h"
 #include "util/u_memory.h"
@@ -163,26 +164,35 @@ softpipe_delete_vs_state(struct pipe_context *pipe, void *vs)
    FREE( state );
 }
 
-
-
 void
 softpipe_set_constant_buffer(struct pipe_context *pipe,
                              uint shader, uint index,
-                             struct pipe_buffer *buf)
+                             struct pipe_buffer *constants)
 {
    struct softpipe_context *softpipe = softpipe_context(pipe);
+   unsigned size = constants ? constants->size : 0;
+   const void *data = constants ? softpipe_buffer(constants)->data : NULL;
 
    assert(shader < PIPE_SHADER_TYPES);
-   assert(index < PIPE_MAX_CONSTANT_BUFFERS);
+   assert(index == 0);
+
+   if(softpipe->constants[shader][index] == constants)
+      return;
 
    draw_flush(softpipe->draw);
 
    /* note: reference counting */
-   pipe_buffer_reference(&softpipe->constants[shader][index], buf);
+   pipe_buffer_reference(&softpipe->constants[shader][index], constants);
+
+   if(shader == PIPE_SHADER_VERTEX) {
+      draw_set_mapped_constant_buffer(softpipe->draw, PIPE_SHADER_VERTEX, 0,
+                                      data, size);
+   }
 
    softpipe->dirty |= SP_NEW_CONSTANTS;
 }
 
+
 void *
 softpipe_create_gs_state(struct pipe_context *pipe,
                          const struct pipe_shader_state *templ)
diff --git a/src/gallium/drivers/softpipe/sp_texture.c b/src/gallium/drivers/softpipe/sp_texture.c
index 32d261b5ff..9641652da8 100644
--- a/src/gallium/drivers/softpipe/sp_texture.c
+++ b/src/gallium/drivers/softpipe/sp_texture.c
@@ -40,7 +40,8 @@
 #include "sp_context.h"
 #include "sp_texture.h"
 #include "sp_screen.h"
-#include "sp_winsys.h"
+
+#include "state_tracker/sw_winsys.h"
 
 
 /**
@@ -72,11 +73,9 @@ softpipe_texture_layout(struct pipe_screen *screen,
       depth = u_minify(depth, 1);
    }
 
-   spt->buffer = screen->buffer_create(screen, 32,
-                                       PIPE_BUFFER_USAGE_PIXEL,
-                                       buffer_size);
+   spt->data = align_malloc(buffer_size, 16);
 
-   return spt->buffer != NULL;
+   return spt->data != NULL;
 }
 
 
@@ -87,19 +86,18 @@ static boolean
 softpipe_displaytarget_layout(struct pipe_screen *screen,
                               struct softpipe_texture * spt)
 {
-   unsigned usage = (PIPE_BUFFER_USAGE_CPU_READ_WRITE |
-                     PIPE_BUFFER_USAGE_GPU_READ_WRITE);
-   unsigned tex_usage = spt->base.tex_usage;
-
-   spt->buffer = screen->surface_buffer_create( screen, 
-                                                spt->base.width0, 
-                                                spt->base.height0,
-                                                spt->base.format,
-                                                usage,
-                                                tex_usage,
-                                                &spt->stride[0]);
-
-   return spt->buffer != NULL;
+   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
+
+   /* Round up the surface size to a multiple of the tile size?
+    */
+   spt->dt = winsys->displaytarget_create(winsys,
+                                          spt->base.format,
+                                          spt->base.width0, 
+                                          spt->base.height0,
+                                          16,
+                                          &spt->stride[0] );
+
+   return spt->dt != NULL;
 }
 
 
@@ -149,37 +147,29 @@ softpipe_texture_blanket(struct pipe_screen * screen,
                          const unsigned *stride,
                          struct pipe_buffer *buffer)
 {
-   struct softpipe_texture *spt;
-   assert(screen);
-
-   /* Only supports one type */
-   if (base->target != PIPE_TEXTURE_2D ||
-       base->last_level != 0 ||
-       base->depth0 != 1) {
-      return NULL;
-   }
-
-   spt = CALLOC_STRUCT(softpipe_texture);
-   if (!spt)
-      return NULL;
-
-   spt->base = *base;
-   pipe_reference_init(&spt->base.reference, 1);
-   spt->base.screen = screen;
-   spt->stride[0] = stride[0];
-
-   pipe_buffer_reference(&spt->buffer, buffer);
-
-   return &spt->base;
+   /* Texture blanket is going away.
+    */
+   debug_printf("softpipe_texture_blanket() not implemented!");
+   return NULL;
 }
 
 
 static void
 softpipe_texture_destroy(struct pipe_texture *pt)
 {
+   struct softpipe_screen *screen = softpipe_screen(pt->screen);
    struct softpipe_texture *spt = softpipe_texture(pt);
 
-   pipe_buffer_reference(&spt->buffer, NULL);
+   if (spt->dt) {
+      /* display target */
+      struct sw_winsys *winsys = screen->winsys;
+      winsys->displaytarget_destroy(winsys, spt->dt);
+   }
+   else {
+      /* regular texture */
+      align_free(spt->data);
+   }
+
    FREE(spt);
 }
 
@@ -359,9 +349,20 @@ softpipe_transfer_map( struct pipe_screen *screen,
    spt = softpipe_texture(transfer->texture);
    format = transfer->texture->format;
 
-   map = pipe_buffer_map(screen, spt->buffer, pipe_transfer_buffer_flags(transfer));
-   if (map == NULL)
-      return NULL;
+   if (spt->dt) {
+      /* display target */
+      struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
+
+      map = winsys->displaytarget_map(winsys, spt->dt,
+                                      pipe_transfer_buffer_flags(transfer));
+      if (map == NULL)
+         return NULL;
+   }
+   else {
+      map = spt->data;
+      if (map == NULL)
+         return NULL;
+   }
 
    /* May want to different things here depending on read/write nature
     * of the map:
@@ -393,7 +394,11 @@ softpipe_transfer_unmap(struct pipe_screen *screen,
    assert(transfer->texture);
    spt = softpipe_texture(transfer->texture);
 
-   pipe_buffer_unmap( screen, spt->buffer );
+   if (spt->dt) {
+      /* display target */
+      struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
+      winsys->displaytarget_unmap(winsys, spt->dt);
+   }
 
    if (transfer->usage & PIPE_TRANSFER_WRITE) {
       /* Mark the texture as dirty to expire the tile caches. */
@@ -474,24 +479,4 @@ softpipe_init_screen_texture_funcs(struct pipe_screen *screen)
 }
 
 
-/**
- * Return pipe_buffer handle and stride for given texture object.
- * XXX used for???
- */
-boolean
-softpipe_get_texture_buffer( struct pipe_texture *texture,
-                             struct pipe_buffer **buf,
-                             unsigned *stride )
-{
-   struct softpipe_texture *tex = (struct softpipe_texture *) texture;
 
-   if (!tex)
-      return FALSE;
-
-   pipe_buffer_reference(buf, tex->buffer);
-
-   if (stride)
-      *stride = tex->stride[0];
-
-   return TRUE;
-}
diff --git a/src/gallium/drivers/softpipe/sp_texture.h b/src/gallium/drivers/softpipe/sp_texture.h
index 2ef64e1e7c..e8d17ce7da 100644
--- a/src/gallium/drivers/softpipe/sp_texture.h
+++ b/src/gallium/drivers/softpipe/sp_texture.h
@@ -45,9 +45,16 @@ struct softpipe_texture
    unsigned long level_offset[PIPE_MAX_TEXTURE_LEVELS];
    unsigned stride[PIPE_MAX_TEXTURE_LEVELS];
 
-   /* The data is held here:
+   /**
+    * Display target, for textures with the PIPE_TEXTURE_USAGE_DISPLAY_TARGET
+    * usage.
+    */
+   struct sw_displaytarget *dt;
+
+   /**
+    * Malloc'ed data for regular textures, or a mapping to dt above.
     */
-   struct pipe_buffer *buffer;
+   void *data;
 
    /* True if texture images are power-of-two in all dimensions:
     */
diff --git a/src/gallium/drivers/softpipe/sp_winsys.c b/src/gallium/drivers/softpipe/sp_winsys.c
deleted file mode 100644
index 0a6245ed2c..0000000000
--- a/src/gallium/drivers/softpipe/sp_winsys.c
+++ /dev/null
@@ -1,245 +0,0 @@
-/**************************************************************************
- * 
- * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
- * 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 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
- * THE COPYRIGHT HOLDERS, AUTHORS 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.
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- * 
- * 
- **************************************************************************/
-
-/**
- * @file
- * Malloc softpipe winsys. Uses malloc for all memory allocations.
- * 
- * @author Keith Whitwell
- * @author Brian Paul
- * @author Jose Fonseca
- */
-
-
-#include "util/u_simple_screen.h"/* port to just p_screen */
-#include "util/u_format.h"
-#include "util/u_math.h"
-#include "util/u_memory.h"
-#include "util/u_inlines.h"
-#include "pipe/p_format.h"
-#include "pipe/p_context.h"
-#include "sp_winsys.h"
-
-
-struct st_softpipe_buffer
-{
-   struct pipe_buffer base;
-   boolean userBuffer;  /** Is this a user-space buffer? */
-   void *data;
-   void *mapped;
-};
-
-
-/** Cast wrapper */
-static INLINE struct st_softpipe_buffer *
-st_softpipe_buffer( struct pipe_buffer *buf )
-{
-   return (struct st_softpipe_buffer *)buf;
-}
-
-
-static void *
-st_softpipe_buffer_map(struct pipe_winsys *winsys, 
-                       struct pipe_buffer *buf,
-                       unsigned flags)
-{
-   struct st_softpipe_buffer *st_softpipe_buf = st_softpipe_buffer(buf);
-   st_softpipe_buf->mapped = st_softpipe_buf->data;
-   return st_softpipe_buf->mapped;
-}
-
-
-static void
-st_softpipe_buffer_unmap(struct pipe_winsys *winsys, 
-                         struct pipe_buffer *buf)
-{
-   struct st_softpipe_buffer *st_softpipe_buf = st_softpipe_buffer(buf);
-   st_softpipe_buf->mapped = NULL;
-}
-
-
-static void
-st_softpipe_buffer_destroy(struct pipe_buffer *buf)
-{
-   struct st_softpipe_buffer *oldBuf = st_softpipe_buffer(buf);
-
-   if (oldBuf->data) {
-      if (!oldBuf->userBuffer)
-         align_free(oldBuf->data);
-
-      oldBuf->data = NULL;
-   }
-
-   FREE(oldBuf);
-}
-
-
-static void
-st_softpipe_flush_frontbuffer(struct pipe_winsys *winsys,
-                              struct pipe_surface *surf,
-                              void *context_private)
-{
-}
-
-
-
-static const char *
-st_softpipe_get_name(struct pipe_winsys *winsys)
-{
-   return "softpipe";
-}
-
-
-static struct pipe_buffer *
-st_softpipe_buffer_create(struct pipe_winsys *winsys, 
-                          unsigned alignment, 
-                          unsigned usage,
-                          unsigned size)
-{
-   struct st_softpipe_buffer *buffer = CALLOC_STRUCT(st_softpipe_buffer);
-
-   pipe_reference_init(&buffer->base.reference, 1);
-   buffer->base.alignment = alignment;
-   buffer->base.usage = usage;
-   buffer->base.size = size;
-
-   buffer->data = align_malloc(size, alignment);
-
-   return &buffer->base;
-}
-
-
-/**
- * Create buffer which wraps user-space data.
- */
-static struct pipe_buffer *
-st_softpipe_user_buffer_create(struct pipe_winsys *winsys, 
-                               void *ptr, 
-                               unsigned bytes)
-{
-   struct st_softpipe_buffer *buffer;
-   
-   buffer = CALLOC_STRUCT(st_softpipe_buffer);
-   if(!buffer)
-      return NULL;
-   
-   pipe_reference_init(&buffer->base.reference, 1);
-   buffer->base.size = bytes;
-   buffer->userBuffer = TRUE;
-   buffer->data = ptr;
-
-   return &buffer->base;
-}
-
-
-static struct pipe_buffer *
-st_softpipe_surface_buffer_create(struct pipe_winsys *winsys,
-                                  unsigned width, unsigned height,
-                                  enum pipe_format format,
-                                  unsigned usage,
-                                  unsigned tex_usage,
-                                  unsigned *stride)
-{
-   const unsigned alignment = 64;
-   unsigned nblocksy;
-
-   nblocksy = util_format_get_nblocksy(format, height);
-   *stride = align(util_format_get_stride(format, width), alignment);
-
-   return winsys->buffer_create(winsys, alignment,
-                                usage,
-                                *stride * nblocksy);
-}
-
-
-static void
-st_softpipe_fence_reference(struct pipe_winsys *winsys, 
-                            struct pipe_fence_handle **ptr,
-                            struct pipe_fence_handle *fence)
-{
-}
-
-
-static int
-st_softpipe_fence_signalled(struct pipe_winsys *winsys, 
-                            struct pipe_fence_handle *fence,
-                            unsigned flag)
-{
-   return 0;
-}
-
-
-static int
-st_softpipe_fence_finish(struct pipe_winsys *winsys, 
-                         struct pipe_fence_handle *fence,
-                         unsigned flag)
-{
-   return 0;
-}
-
-
-static void
-st_softpipe_destroy(struct pipe_winsys *winsys)
-{
-   FREE(winsys);
-}
-
-
-struct pipe_screen *
-softpipe_create_screen_malloc(void)
-{
-   static struct pipe_winsys *winsys;
-   struct pipe_screen *screen;
-
-   winsys = CALLOC_STRUCT(pipe_winsys);
-   if(!winsys)
-      return NULL;
-
-   winsys->destroy = st_softpipe_destroy;
-   
-   winsys->buffer_create = st_softpipe_buffer_create;
-   winsys->user_buffer_create = st_softpipe_user_buffer_create;
-   winsys->buffer_map = st_softpipe_buffer_map;
-   winsys->buffer_unmap = st_softpipe_buffer_unmap;
-   winsys->buffer_destroy = st_softpipe_buffer_destroy;
-
-   winsys->surface_buffer_create = st_softpipe_surface_buffer_create;
-
-   winsys->fence_reference = st_softpipe_fence_reference;
-   winsys->fence_signalled = st_softpipe_fence_signalled;
-   winsys->fence_finish = st_softpipe_fence_finish;
-
-   winsys->flush_frontbuffer = st_softpipe_flush_frontbuffer;
-   winsys->get_name = st_softpipe_get_name;
-
-   screen = softpipe_create_screen(winsys);
-   if(!screen)
-      st_softpipe_destroy(winsys);
-
-   return screen;
-}