gallium: tex surface checkpoint

27 files changed, 328 insertions, 178 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pipe_aaline.c b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
index f501b2aed4..6dc20f2c90 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_aaline.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
@@ -415,8 +415,11 @@ aaline_create_texture(struct aaline_stage *aaline)
 
       assert(aaline->texture->width[level] == aaline->texture->height[level]);
 
-      surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0);
-      data = pipe_surface_map(surface);
+      /* This texture is new, no need to flush. 
+       */
+      surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0,
+                                        PIPE_BUFFER_USAGE_CPU_WRITE);
+      data = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
       if (data == NULL)
          return FALSE;
 
@@ -440,9 +443,8 @@ aaline_create_texture(struct aaline_stage *aaline)
       }
 
       /* unmap */
-      pipe_surface_unmap(surface);
-      pipe_surface_reference(&surface, NULL);
-      pipe->texture_update(pipe, aaline->texture, 0, (1 << level));
+      screen->surface_unmap(screen, surface);
+      screen->tex_surface_release(screen, &surface);
    }
    return TRUE;
 }
diff --git a/src/gallium/auxiliary/draw/draw_pipe_pstipple.c b/src/gallium/auxiliary/draw/draw_pipe_pstipple.c
index c4de9d2698..3aa326acc7 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_pstipple.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_pstipple.c
@@ -376,8 +376,14 @@ pstip_update_texture(struct pstip_stage *pstip)
    uint i, j;
    ubyte *data;
 
-   surface = screen->get_tex_surface(screen, pstip->texture, 0, 0, 0);
-   data = pipe_surface_map(surface);
+   /* XXX: want to avoid flushing just because we use stipple: 
+    */
+   pipe->flush( pipe, PIPE_FLUSH_TEXTURE_CACHE, NULL );
+
+   surface = screen->get_tex_surface(screen, pstip->texture, 0, 0, 0,
+                                     PIPE_BUFFER_USAGE_CPU_WRITE);
+   data = screen->surface_map(screen, surface,
+                              PIPE_BUFFER_USAGE_CPU_WRITE);
 
    /*
     * Load alpha texture.
@@ -399,9 +405,8 @@ pstip_update_texture(struct pstip_stage *pstip)
    }
 
    /* unmap */
-   pipe_surface_unmap(surface);
-   pipe_surface_reference(&surface, NULL);
-   pipe->texture_update(pipe, pstip->texture, 0, 0x1);
+   screen->surface_unmap(screen, surface);
+   screen->tex_surface_release(screen, &surface);
 }
 
 
diff --git a/src/gallium/auxiliary/util/p_tile.c b/src/gallium/auxiliary/util/p_tile.c
index 63e1cc6013..5728757d2f 100644
--- a/src/gallium/auxiliary/util/p_tile.c
+++ b/src/gallium/auxiliary/util/p_tile.c
@@ -50,6 +50,7 @@ pipe_get_tile_raw(struct pipe_context *pipe,
                   uint x, uint y, uint w, uint h,
                   void *p, int dst_stride)
 {
+   struct pipe_screen *screen = pipe->screen;
    const uint cpp = ps->cpp;
    const ubyte *pSrc;
    const uint src_stride = ps->pitch * cpp;
@@ -63,7 +64,11 @@ pipe_get_tile_raw(struct pipe_context *pipe,
    if (pipe_clip_tile(x, y, &w, &h, ps))
       return;
 
-   pSrc = (const ubyte *) pipe_surface_map(ps) + (y * ps->pitch + x) * cpp;
+   pSrc = (const ubyte *) screen->surface_map(screen, ps,
+                                              PIPE_BUFFER_USAGE_CPU_READ);
+   assert(pSrc);                /* XXX: proper error handling! */
+
+   pSrc += (y * ps->pitch + x) * cpp;
    pDest = (ubyte *) p;
 
    for (i = 0; i < h; i++) {
@@ -72,7 +77,7 @@ pipe_get_tile_raw(struct pipe_context *pipe,
       pSrc += src_stride;
    }
 
-   pipe_surface_unmap(ps);
+   screen->surface_unmap(screen, ps);
 }
 
 
@@ -86,6 +91,7 @@ pipe_put_tile_raw(struct pipe_context *pipe,
                   uint x, uint y, uint w, uint h,
                   const void *p, int src_stride)
 {
+   struct pipe_screen *screen = pipe->screen;
    const uint cpp = ps->cpp;
    const ubyte *pSrc;
    const uint dst_stride = ps->pitch * cpp;
@@ -100,7 +106,11 @@ pipe_put_tile_raw(struct pipe_context *pipe,
       return;
 
    pSrc = (const ubyte *) p;
-   pDest = (ubyte *) pipe_surface_map(ps) + (y * ps->pitch + x) * cpp;
+
+   pDest = screen->surface_map(screen, ps, PIPE_BUFFER_USAGE_CPU_WRITE);
+   assert(pDest);               /* XXX: proper error handling */
+
+   pDest += (y * ps->pitch + x) * cpp;
 
    for (i = 0; i < h; i++) {
       memcpy(pDest, pSrc, w * cpp);
@@ -108,7 +118,7 @@ pipe_put_tile_raw(struct pipe_context *pipe,
       pSrc += src_stride;
    }
 
-   pipe_surface_unmap(ps);
+   screen->surface_unmap(screen, ps);
 }
 
 
@@ -834,18 +844,26 @@ pipe_get_tile_z(struct pipe_context *pipe,
                 uint x, uint y, uint w, uint h,
                 uint *z)
 {
+   struct pipe_screen *screen = pipe->screen;
    const uint dstStride = w;
+   void *map;
    uint *pDest = z;
    uint i, j;
 
    if (pipe_clip_tile(x, y, &w, &h, ps))
       return;
 
+   map = screen->surface_map(screen, ps, PIPE_BUFFER_USAGE_CPU_READ);
+   if (!map) {
+      assert(0);
+      return;
+   }
+
    switch (ps->format) {
    case PIPE_FORMAT_Z32_UNORM:
       {
          const uint *pSrc
-            = (const uint *) pipe_surface_map(ps) + (y * ps->pitch + x);
+            = (const uint *)map  + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             memcpy(pDest, pSrc, 4 * w);
             pDest += dstStride;
@@ -857,7 +875,7 @@ pipe_get_tile_z(struct pipe_context *pipe,
    case PIPE_FORMAT_X8Z24_UNORM:
       {
          const uint *pSrc
-            = (const uint *) pipe_surface_map(ps) + (y * ps->pitch + x);
+            = (const uint *)map + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++) {
                /* convert 24-bit Z to 32-bit Z */
@@ -871,7 +889,7 @@ pipe_get_tile_z(struct pipe_context *pipe,
    case PIPE_FORMAT_Z16_UNORM:
       {
          const ushort *pSrc
-            = (const ushort *) pipe_surface_map(ps) + (y * ps->pitch + x);
+            = (const ushort *)map + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++) {
                /* convert 16-bit Z to 32-bit Z */
@@ -886,7 +904,7 @@ pipe_get_tile_z(struct pipe_context *pipe,
       assert(0);
    }
 
-   pipe_surface_unmap(ps);
+   screen->surface_unmap(screen, ps);
 }
 
 
@@ -896,17 +914,25 @@ pipe_put_tile_z(struct pipe_context *pipe,
                 uint x, uint y, uint w, uint h,
                 const uint *zSrc)
 {
+   struct pipe_screen *screen = pipe->screen;
    const uint srcStride = w;
    const uint *pSrc = zSrc;
+   void *map;
    uint i, j;
 
    if (pipe_clip_tile(x, y, &w, &h, ps))
       return;
 
+   map = screen->surface_map(screen, ps, PIPE_BUFFER_USAGE_CPU_WRITE);
+   if (!map) {
+      assert(0);
+      return;
+   }
+
    switch (ps->format) {
    case PIPE_FORMAT_Z32_UNORM:
       {
-         uint *pDest = (uint *) pipe_surface_map(ps) + (y * ps->pitch + x);
+         uint *pDest = (uint *) map + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             memcpy(pDest, pSrc, 4 * w);
             pDest += ps->pitch;
@@ -917,7 +943,7 @@ pipe_put_tile_z(struct pipe_context *pipe,
    case PIPE_FORMAT_S8Z24_UNORM:
    case PIPE_FORMAT_X8Z24_UNORM:
       {
-         uint *pDest = (uint *) pipe_surface_map(ps) + (y * ps->pitch + x);
+         uint *pDest = (uint *) map + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++) {
                /* convert 32-bit Z to 24-bit Z (0 stencil) */
@@ -930,7 +956,7 @@ pipe_put_tile_z(struct pipe_context *pipe,
       break;
    case PIPE_FORMAT_Z16_UNORM:
       {
-         ushort *pDest = (ushort *) pipe_surface_map(ps) + (y * ps->pitch + x);
+         ushort *pDest = (ushort *) map + (y * ps->pitch + x);
          for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++) {
                /* convert 32-bit Z to 16-bit Z */
@@ -945,7 +971,7 @@ pipe_put_tile_z(struct pipe_context *pipe,
       assert(0);
    }
 
-   pipe_surface_unmap(ps);
+   screen->surface_unmap(screen, ps);
 }
 
 
diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index 9e9912c6e4..257473ab26 100644
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -287,7 +287,8 @@ util_blit_pixels(struct blit_state *ctx,
    if (!tex)
       return;
 
-   texSurf = screen->get_tex_surface(screen, tex, 0, 0, 0);
+   texSurf = screen->get_tex_surface(screen, tex, 0, 0, 0, 
+                                     PIPE_BUFFER_USAGE_GPU_WRITE);
 
    /* load temp texture */
    pipe->surface_copy(pipe, FALSE,
diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index 0348629ab8..6ed5503c9a 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -586,8 +586,11 @@ make_1d_mipmap(struct gen_mipmap_state *ctx,
       struct pipe_surface *srcSurf, *dstSurf;
       void *srcMap, *dstMap;
       
-      srcSurf = screen->get_tex_surface(screen, pt, face, srcLevel, zslice);
-      dstSurf = screen->get_tex_surface(screen, pt, face, dstLevel, zslice);
+      srcSurf = screen->get_tex_surface(screen, pt, face, srcLevel, zslice,
+                                        PIPE_BUFFER_USAGE_CPU_READ);
+
+      dstSurf = screen->get_tex_surface(screen, pt, face, dstLevel, zslice,
+                                        PIPE_BUFFER_USAGE_CPU_WRITE);
 
       srcMap = ((ubyte *) winsys->buffer_map(winsys, srcSurf->buffer,
                                             PIPE_BUFFER_USAGE_CPU_READ)
@@ -626,8 +629,10 @@ make_2d_mipmap(struct gen_mipmap_state *ctx,
       struct pipe_surface *srcSurf, *dstSurf;
       ubyte *srcMap, *dstMap;
       
-      srcSurf = screen->get_tex_surface(screen, pt, face, srcLevel, zslice);
-      dstSurf = screen->get_tex_surface(screen, pt, face, dstLevel, zslice);
+      srcSurf = screen->get_tex_surface(screen, pt, face, srcLevel, zslice,
+                                        PIPE_BUFFER_USAGE_CPU_READ);
+      dstSurf = screen->get_tex_surface(screen, pt, face, dstLevel, zslice,
+                                        PIPE_BUFFER_USAGE_CPU_WRITE);
 
       srcMap = ((ubyte *) winsys->buffer_map(winsys, srcSurf->buffer,
                                             PIPE_BUFFER_USAGE_CPU_READ)
@@ -888,10 +893,14 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
       const uint srcLevel = dstLevel - 1;
 
+      struct pipe_surface *surf = 
+         screen->get_tex_surface(screen, pt, face, dstLevel, zslice,
+                                 PIPE_BUFFER_USAGE_GPU_WRITE);
+
       /*
        * Setup framebuffer / dest surface
        */
-      fb.cbufs[0] = screen->get_tex_surface(screen, pt, face, dstLevel, zslice);
+      fb.cbufs[0] = surf;
       fb.width = pt->width[dstLevel];
       fb.height = pt->height[dstLevel];
       cso_set_framebuffer(ctx->cso, &fb);
@@ -922,7 +931,7 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
       pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 
       /* need to signal that the texture has changed _after_ rendering to it */
-      pipe->texture_update(pipe, pt, face, (1 << dstLevel));
+      pipe_surface_reference( &surf, NULL );
    }
 
    /* restore state we changed */
diff --git a/src/gallium/drivers/failover/fo_context.c b/src/gallium/drivers/failover/fo_context.c
index cb95ba516f..014a3e31d5 100644
--- a/src/gallium/drivers/failover/fo_context.c
+++ b/src/gallium/drivers/failover/fo_context.c
@@ -147,8 +147,8 @@ struct pipe_context *failover_create( struct pipe_context *hw,
    failover->pipe.texture_create = hw->texture_create;
    failover->pipe.texture_release = hw->texture_release;
    failover->pipe.get_tex_surface = hw->get_tex_surface;
-#endif
    failover->pipe.texture_update = hw->texture_update;
+#endif
 
    failover->pipe.flush = hw->flush;
 
diff --git a/src/gallium/drivers/i915simple/i915_screen.c b/src/gallium/drivers/i915simple/i915_screen.c
index 631642e1b6..dcd349e478 100644
--- a/src/gallium/drivers/i915simple/i915_screen.c
+++ b/src/gallium/drivers/i915simple/i915_screen.c
@@ -200,6 +200,35 @@ i915_destroy_screen( struct pipe_screen *screen )
 }
 
 
+static void *
+i915_surface_map( struct pipe_screen *screen,
+                  struct pipe_surface *surface,
+                  unsigned flags )
+{
+   char *map = screen->winsys->buffer_map( screen->winsys, surface->buffer, flags );
+   if (map == NULL)
+      return NULL;
+
+   if (surface->texture &&
+       (flags & PIPE_BUFFER_USAGE_CPU_WRITE)) 
+   {
+      /* Do something to notify contexts of a texture change.  
+       */
+      /* i915_screen(screen)->timestamp++; */
+   }
+   
+   return map + surface->offset;
+}
+
+static void
+i915_surface_unmap(struct pipe_screen *screen,
+                   struct pipe_surface *surface)
+{
+   screen->winsys->buffer_unmap( screen->winsys, surface->buffer );
+}
+
+
+
 /**
  * Create a new i915_screen object
  */
@@ -243,6 +272,8 @@ i915_create_screen(struct pipe_winsys *winsys, uint pci_id)
    i915screen->screen.get_param = i915_get_param;
    i915screen->screen.get_paramf = i915_get_paramf;
    i915screen->screen.is_format_supported = i915_is_format_supported;
+   i915screen->screen.surface_map = i915_surface_map;
+   i915screen->screen.surface_unmap = i915_surface_unmap;
 
    i915_init_screen_texture_functions(&i915screen->screen);
 
diff --git a/src/gallium/drivers/i915simple/i915_surface.c b/src/gallium/drivers/i915simple/i915_surface.c
index f4fbedbe9b..98367ac073 100644
--- a/src/gallium/drivers/i915simple/i915_surface.c
+++ b/src/gallium/drivers/i915simple/i915_surface.c
@@ -51,17 +51,25 @@ i915_surface_copy(struct pipe_context *pipe,
    assert( dst->cpp == src->cpp );
 
    if (0) {
-      pipe_copy_rect(pipe_surface_map(dst),
+      void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                                 dst,
+                                                 PIPE_BUFFER_USAGE_CPU_WRITE );
+      
+      const void *src_map = pipe->screen->surface_map( pipe->screen,
+                                                       src,
+                                                       PIPE_BUFFER_USAGE_CPU_READ );
+      
+      pipe_copy_rect(dst_map,
                      dst->cpp,
                      dst->pitch,
                      dstx, dsty, 
                      width, height, 
-                     pipe_surface_map(src), 
+                     src_map, 
                      do_flip ? -(int) src->pitch : src->pitch, 
                      srcx, do_flip ? 1 - srcy - height : srcy);
 
-      pipe_surface_unmap(src);
-      pipe_surface_unmap(dst);
+      pipe->screen->surface_unmap(pipe->screen, src);
+      pipe->screen->surface_unmap(pipe->screen, dst);
    }
    else {
       i915_copy_blit( i915_context(pipe),
@@ -92,7 +100,10 @@ i915_surface_fill(struct pipe_context *pipe,
 {
    if (0) {
       unsigned i, j;
-      void *dst_map = pipe_surface_map(dst);
+      void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                                 dst,
+                                                 PIPE_BUFFER_USAGE_CPU_WRITE );
+
 
       switch (dst->cpp) {
       case 1: {
@@ -126,7 +137,7 @@ i915_surface_fill(struct pipe_context *pipe,
 	 break;
       }
 
-      pipe_surface_unmap( dst );
+      pipe->screen->surface_unmap(pipe->screen, dst);
    }
    else {
       i915_fill_blit( i915_context(pipe),
diff --git a/src/gallium/drivers/i915simple/i915_texture.c b/src/gallium/drivers/i915simple/i915_texture.c
index c39e747705..7b9359a0fe 100644
--- a/src/gallium/drivers/i915simple/i915_texture.c
+++ b/src/gallium/drivers/i915simple/i915_texture.c
@@ -541,13 +541,6 @@ i915_texture_release_screen(struct pipe_screen *screen,
 }
 
 
-static void
-i915_texture_update(struct pipe_context *pipe, struct pipe_texture *texture,
-                    uint face, uint levelsMask)
-{
-   /* no-op? */
-}
-
 
 /*
  * XXX note: same as code in sp_surface.c
@@ -555,7 +548,8 @@ i915_texture_update(struct pipe_context *pipe, struct pipe_texture *texture,
 static struct pipe_surface *
 i915_get_tex_surface_screen(struct pipe_screen *screen,
                             struct pipe_texture *pt,
-                            unsigned face, unsigned level, unsigned zslice)
+                            unsigned face, unsigned level, unsigned zslice,
+                            unsigned flags)
 {
    struct i915_texture *tex = (struct i915_texture *)pt;
    struct pipe_winsys *ws = screen->winsys;
@@ -586,6 +580,7 @@ i915_get_tex_surface_screen(struct pipe_screen *screen,
       ps->height = pt->height[level];
       ps->pitch = tex->pitch;
       ps->offset = offset;
+      ps->usage = flags;
    }
    return ps;
 }
@@ -594,7 +589,7 @@ i915_get_tex_surface_screen(struct pipe_screen *screen,
 void
 i915_init_texture_functions(struct i915_context *i915)
 {
-   i915->pipe.texture_update = i915_texture_update;
+//   i915->pipe.texture_update = i915_texture_update;
 }
 
 
diff --git a/src/gallium/drivers/i965simple/brw_surface.c b/src/gallium/drivers/i965simple/brw_surface.c
index c99a91dcf7..3e3736b280 100644
--- a/src/gallium/drivers/i965simple/brw_surface.c
+++ b/src/gallium/drivers/i965simple/brw_surface.c
@@ -35,27 +35,6 @@
 #include "util/p_tile.h"
 
 
-/* Upload data to a rectangular sub-region.  Lots of choices how to do this:
- *
- * - memcpy by span to current destination
- * - upload data as new buffer and blit
- *
- * Currently always memcpy.
- */
-static void
-brw_surface_data(struct pipe_context *pipe,
-                 struct pipe_surface *dst,
-                 unsigned dstx, unsigned dsty,
-                 const void *src, unsigned src_pitch,
-                 unsigned srcx, unsigned srcy, unsigned width, unsigned height)
-{
-   pipe_copy_rect(pipe_surface_map(dst) + dst->offset,
-                  dst->cpp, dst->pitch,
-                  dstx, dsty, width, height, src, src_pitch, srcx, srcy);
-
-   pipe_surface_unmap(dst);
-}
-
 
 /* Assumes all values are within bounds -- no checking at this level -
  * do it higher up if required.
@@ -72,17 +51,25 @@ brw_surface_copy(struct pipe_context *pipe,
    assert(dst->cpp == src->cpp);
 
    if (0) {
-      pipe_copy_rect(pipe_surface_map(dst) + dst->offset,
+      void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                                 dst,
+                                                 PIPE_BUFFER_USAGE_CPU_WRITE );
+      
+      const void *src_map = pipe->screen->surface_map( pipe->screen,
+                                                       src,
+                                                       PIPE_BUFFER_USAGE_CPU_READ );
+      
+      pipe_copy_rect(dst_map,
                      dst->cpp,
                      dst->pitch,
-                     dstx, dsty,
-                     width, height,
-                     pipe_surface_map(src) + src->offset,
-                     do_flip ? -src->pitch : src->pitch,
+                     dstx, dsty, 
+                     width, height, 
+                     src_map, 
+                     do_flip ? -(int) src->pitch : src->pitch, 
                      srcx, do_flip ? 1 - srcy - height : srcy);
 
-      pipe_surface_unmap(src);
-      pipe_surface_unmap(dst);
+      pipe->screen->surface_unmap(pipe->screen, src);
+      pipe->screen->surface_unmap(pipe->screen, dst);
    }
    else {
       brw_copy_blit(brw_context(pipe),
@@ -113,7 +100,10 @@ brw_surface_fill(struct pipe_context *pipe,
 {
    if (0) {
       unsigned i, j;
-      void *dst_map = pipe_surface_map(dst);
+      void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                                 dst,
+                                                 PIPE_BUFFER_USAGE_CPU_WRITE );
+
 
       switch (dst->cpp) {
       case 1: {
@@ -147,7 +137,7 @@ brw_surface_fill(struct pipe_context *pipe,
 	 break;
       }
 
-      pipe_surface_unmap( dst );
+      pipe->screen->surface_unmap(pipe->screen, dst);
    }
    else {
       brw_fill_blit(brw_context(pipe),
@@ -164,7 +154,6 @@ brw_surface_fill(struct pipe_context *pipe,
 void
 brw_init_surface_functions(struct brw_context *brw)
 {
-   (void) brw_surface_data; /* silence warning */
    brw->pipe.surface_copy  = brw_surface_copy;
    brw->pipe.surface_fill  = brw_surface_fill;
 }
diff --git a/src/gallium/drivers/i965simple/brw_tex_layout.c b/src/gallium/drivers/i965simple/brw_tex_layout.c
index b580f98204..ba4c4a7bcf 100644
--- a/src/gallium/drivers/i965simple/brw_tex_layout.c
+++ b/src/gallium/drivers/i965simple/brw_tex_layout.c
@@ -407,7 +407,7 @@ brw_get_tex_surface_screen(struct pipe_screen *screen,
 void
 brw_init_texture_functions(struct brw_context *brw)
 {
-   brw->pipe.texture_update = brw_texture_update;
+//   brw->pipe.texture_update = brw_texture_update;
 }
 
 
diff --git a/src/gallium/drivers/softpipe/sp_context.c b/src/gallium/drivers/softpipe/sp_context.c
index edf91ecafa..ee74826763 100644
--- a/src/gallium/drivers/softpipe/sp_context.c
+++ b/src/gallium/drivers/softpipe/sp_context.c
@@ -192,11 +192,11 @@ softpipe_create( struct pipe_screen *screen,
     * Must be before quad stage setup!
     */
    for (i = 0; i < PIPE_MAX_COLOR_BUFS; i++)
-      softpipe->cbuf_cache[i] = sp_create_tile_cache();
-   softpipe->zsbuf_cache = sp_create_tile_cache();
+      softpipe->cbuf_cache[i] = sp_create_tile_cache( screen );
+   softpipe->zsbuf_cache = sp_create_tile_cache( screen );
 
    for (i = 0; i < PIPE_MAX_SAMPLERS; i++)
-      softpipe->tex_cache[i] = sp_create_tile_cache();
+      softpipe->tex_cache[i] = sp_create_tile_cache( screen );
 
 
    /* setup quad rendering stages */
diff --git a/src/gallium/drivers/softpipe/sp_draw_arrays.c b/src/gallium/drivers/softpipe/sp_draw_arrays.c
index 6c58f9909d..355c120d18 100644
--- a/src/gallium/drivers/softpipe/sp_draw_arrays.c
+++ b/src/gallium/drivers/softpipe/sp_draw_arrays.c
@@ -50,7 +50,7 @@ softpipe_map_constant_buffers(struct softpipe_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_GPU_READ);
    }
 
    draw_set_mapped_constant_buffer(sp->draw,
@@ -133,14 +133,14 @@ softpipe_draw_elements(struct pipe_context *pipe,
       void *buf
          = pipe->winsys->buffer_map(pipe->winsys,
                                     sp->vertex_buffer[i].buffer,
-                                    PIPE_BUFFER_USAGE_CPU_READ);
+                                    PIPE_BUFFER_USAGE_GPU_READ);
       draw_set_mapped_vertex_buffer(draw, i, buf);
    }
    /* Map index buffer, if present */
    if (indexBuffer) {
       void *mapped_indexes
          = pipe->winsys->buffer_map(pipe->winsys, indexBuffer,
-                                    PIPE_BUFFER_USAGE_CPU_READ);
+                                    PIPE_BUFFER_USAGE_GPU_READ);
       draw_set_mapped_element_buffer(draw, indexSize, mapped_indexes);
    }
    else {
diff --git a/src/gallium/drivers/softpipe/sp_flush.c b/src/gallium/drivers/softpipe/sp_flush.c
index 0625b69099..e03994b63b 100644
--- a/src/gallium/drivers/softpipe/sp_flush.c
+++ b/src/gallium/drivers/softpipe/sp_flush.c
@@ -50,25 +50,28 @@ softpipe_flush( struct pipe_context *pipe,
 
    draw_flush(softpipe->draw);
 
-   /* - flush the quad pipeline
-    * - flush the texture cache
-    * - flush the render cache
-    */
+   if (flags & PIPE_FLUSH_TEXTURE_CACHE) {
+      for (i = 0; i < softpipe->num_textures; i++) {
+         sp_flush_tile_cache(softpipe, softpipe->tex_cache[i]);
+      }
+   }
 
-   for (i = 0; i < softpipe->framebuffer.num_cbufs; i++)
-      if (softpipe->cbuf_cache[i])
-         sp_flush_tile_cache(softpipe, softpipe->cbuf_cache[i]);
+   if (flags & PIPE_FLUSH_RENDER_CACHE) {
+      for (i = 0; i < softpipe->framebuffer.num_cbufs; i++)
+         if (softpipe->cbuf_cache[i])
+            sp_flush_tile_cache(softpipe, softpipe->cbuf_cache[i]);
 
-   if (softpipe->zsbuf_cache)
-      sp_flush_tile_cache(softpipe, softpipe->zsbuf_cache);
+      if (softpipe->zsbuf_cache)
+         sp_flush_tile_cache(softpipe, softpipe->zsbuf_cache);
 
-   /* Need this call for hardware buffers before swapbuffers.
-    *
-    * there should probably be another/different flush-type function
-    * that's called before swapbuffers because we don't always want
-    * to unmap surfaces when flushing.
-    */
-   softpipe_unmap_surfaces(softpipe);
+      /* Need this call for hardware buffers before swapbuffers.
+       *
+       * there should probably be another/different flush-type function
+       * that's called before swapbuffers because we don't always want
+       * to unmap surfaces when flushing.
+       */
+      softpipe_unmap_surfaces(softpipe);
+   }
 
    if (fence)
       *fence = NULL;
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 7dacb1c461..e9926bf41f 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -33,6 +33,7 @@
 
 #include "sp_texture.h"
 #include "sp_winsys.h"
+#include "sp_screen.h"
 
 
 static const char *
@@ -137,6 +138,7 @@ softpipe_destroy_screen( struct pipe_screen *screen )
 }
 
 
+
 /**
  * Create a new pipe_screen object
  * Note: we're not presently subclassing pipe_screen (no softpipe_screen).
@@ -144,22 +146,22 @@ softpipe_destroy_screen( struct pipe_screen *screen )
 struct pipe_screen *
 softpipe_create_screen(struct pipe_winsys *winsys)
 {
-   struct pipe_screen *screen = CALLOC_STRUCT(pipe_screen);
+   struct softpipe_screen *screen = CALLOC_STRUCT(softpipe_screen);
 
    if (!screen)
       return NULL;
 
-   screen->winsys = winsys;
+   screen->base.winsys = winsys;
 
-   screen->destroy = softpipe_destroy_screen;
+   screen->base.destroy = softpipe_destroy_screen;
 
-   screen->get_name = softpipe_get_name;
-   screen->get_vendor = softpipe_get_vendor;
-   screen->get_param = softpipe_get_param;
-   screen->get_paramf = softpipe_get_paramf;
-   screen->is_format_supported = softpipe_is_format_supported;
+   screen->base.get_name = softpipe_get_name;
+   screen->base.get_vendor = softpipe_get_vendor;
+   screen->base.get_param = softpipe_get_param;
+   screen->base.get_paramf = softpipe_get_paramf;
+   screen->base.is_format_supported = softpipe_is_format_supported;
 
-   softpipe_init_screen_texture_funcs(screen);
+   softpipe_init_screen_texture_funcs(&screen->base);
 
-   return screen;
+   return &screen->base;
 }
diff --git a/src/gallium/drivers/softpipe/sp_surface.c b/src/gallium/drivers/softpipe/sp_surface.c
index 653449c4f1..b5cc053548 100644
--- a/src/gallium/drivers/softpipe/sp_surface.c
+++ b/src/gallium/drivers/softpipe/sp_surface.c
@@ -47,18 +47,27 @@ sp_surface_copy(struct pipe_context *pipe,
 		unsigned srcx, unsigned srcy, unsigned width, unsigned height)
 {
    assert( dst->cpp == src->cpp );
+   void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                              dst,
+                                              PIPE_BUFFER_USAGE_GPU_WRITE );
 
-   pipe_copy_rect(pipe_surface_map(dst),
+   const void *src_map = pipe->screen->surface_map( pipe->screen,
+                                                    src,
+                                                    PIPE_BUFFER_USAGE_GPU_READ );
+
+   assert(src_map && dst_map);
+
+   pipe_copy_rect(dst_map,
                   dst->cpp,
                   dst->pitch,
                   dstx, dsty,
                   width, height,
-                  pipe_surface_map(src),
+                  src_map,
                   do_flip ? -(int) src->pitch : src->pitch,
                   srcx, do_flip ? 1 - srcy - height : srcy);
 
-   pipe_surface_unmap(src);
-   pipe_surface_unmap(dst);
+   pipe->screen->surface_unmap(pipe->screen, src);
+   pipe->screen->surface_unmap(pipe->screen, dst);
 }
 
 
@@ -83,7 +92,9 @@ sp_surface_fill(struct pipe_context *pipe,
 		unsigned width, unsigned height, unsigned value)
 {
    unsigned i, j;
-   void *dst_map = pipe_surface_map(dst);
+   void *dst_map = pipe->screen->surface_map( pipe->screen,
+                                              dst,
+                                              PIPE_BUFFER_USAGE_GPU_WRITE );
 
    assert(dst->pitch > 0);
    assert(width <= dst->pitch);
@@ -147,7 +158,7 @@ sp_surface_fill(struct pipe_context *pipe,
       break;
    }
 
-   pipe_surface_unmap( dst );
+   pipe->screen->surface_unmap(pipe->screen, dst);
 }
 
 
diff --git a/src/gallium/drivers/softpipe/sp_texture.c b/src/gallium/drivers/softpipe/sp_texture.c
index 256586ec88..ee3fa994f9 100644
--- a/src/gallium/drivers/softpipe/sp_texture.c
+++ b/src/gallium/drivers/softpipe/sp_texture.c
@@ -40,6 +40,7 @@
 #include "sp_state.h"
 #include "sp_texture.h"
 #include "sp_tile_cache.h"
+#include "sp_screen.h"
 
 
 /* Simple, maximally packed layout.
@@ -116,19 +117,10 @@ softpipe_texture_release(struct pipe_screen *screen,
    if (!*pt)
       return;
 
-   /*
-   DBG("%s %p refcount will be %d\n",
-       __FUNCTION__, (void *) *pt, (*pt)->refcount - 1);
-   */
    if (--(*pt)->refcount <= 0) {
       struct softpipe_texture *spt = softpipe_texture(*pt);
 
-      /*
-      DBG("%s deleting %p\n", __FUNCTION__, (void *) spt);
-      */
-
       pipe_buffer_reference(screen->winsys, &spt->buffer, NULL);
-
       FREE(spt);
    }
    *pt = NULL;
@@ -138,7 +130,8 @@ softpipe_texture_release(struct pipe_screen *screen,
 static struct pipe_surface *
 softpipe_get_tex_surface(struct pipe_screen *screen,
                          struct pipe_texture *pt,
-                         unsigned face, unsigned level, unsigned zslice)
+                         unsigned face, unsigned level, unsigned zslice,
+                         unsigned usage)
 {
    struct pipe_winsys *ws = screen->winsys;
    struct softpipe_texture *spt = softpipe_texture(pt);
@@ -157,6 +150,7 @@ softpipe_get_tex_surface(struct pipe_screen *screen,
       ps->height = pt->height[level];
       ps->pitch = ps->width;
       ps->offset = spt->level_offset[level];
+      ps->usage = usage;
 
       if (pt->target == PIPE_TEXTURE_CUBE || pt->target == PIPE_TEXTURE_3D) {
 	 ps->offset += ((pt->target == PIPE_TEXTURE_CUBE) ? face : zslice) *
@@ -167,30 +161,74 @@ softpipe_get_tex_surface(struct pipe_screen *screen,
 	 assert(face == 0);
 	 assert(zslice == 0);
       }
+
+      if (usage & (PIPE_BUFFER_USAGE_CPU_WRITE |
+                   PIPE_BUFFER_USAGE_GPU_WRITE)) {
+         /* XXX if writing to the texture, invalidate the texcache entries!!! */
+         assert(0);
+      }
    }
    return ps;
 }
 
 
-static void
-softpipe_texture_update(struct pipe_context *pipe,
-                        struct pipe_texture *texture,
-                        uint face, uint levelsMask)
+static void 
+softpipe_tex_surface_release(struct pipe_screen *screen, 
+                             struct pipe_surface **s)
 {
-   struct softpipe_context *softpipe = softpipe_context(pipe);
-   uint unit;
-   for (unit = 0; unit < softpipe->num_textures; unit++) {
-      if (softpipe->texture[unit] == texture) {
-         sp_flush_tile_cache(softpipe, softpipe->tex_cache[unit]);
-      }
+   /* Effectively do the texture_update work here - if texture images
+    * needed post-processing to put them into hardware layout, this is
+    * where it would happen.  For softpipe, nothing to do.
+    */
+   assert ((*s)->texture);
+
+   screen->winsys->surface_release(screen->winsys, s);
+}
+
+
+static void *
+softpipe_surface_map( struct pipe_screen *screen,
+                      struct pipe_surface *surface,
+                      unsigned flags )
+{
+   ubyte *map;
+
+   if (flags & ~surface->usage) {
+      assert(0);
+      return NULL;
+   }
+
+   map = screen->winsys->buffer_map( screen->winsys, surface->buffer, flags );
+   if (map == NULL)
+      return NULL;
+
+   /* May want to different things here depending on read/write nature
+    * of the map:
+    */
+   if (surface->texture &&
+       (flags & PIPE_BUFFER_USAGE_GPU_WRITE)) 
+   {
+      /* Do something to notify sharing contexts of a texture change.
+       * In softpipe, that would mean flushing the texture cache.
+       */
+      softpipe_screen(screen)->timestamp++;
    }
+   
+   return map + surface->offset;
+}
+
+
+static void
+softpipe_surface_unmap(struct pipe_screen *screen,
+                       struct pipe_surface *surface)
+{
+   screen->winsys->buffer_unmap( screen->winsys, surface->buffer );
 }
 
 
 void
-softpipe_init_texture_funcs( struct softpipe_context *softpipe )
+softpipe_init_texture_funcs(struct softpipe_context *sp)
 {
-   softpipe->pipe.texture_update = softpipe_texture_update;
 }
 
 
@@ -199,5 +237,10 @@ softpipe_init_screen_texture_funcs(struct pipe_screen *screen)
 {
    screen->texture_create = softpipe_texture_create;
    screen->texture_release = softpipe_texture_release;
+
    screen->get_tex_surface = softpipe_get_tex_surface;
+   screen->tex_surface_release = softpipe_tex_surface_release;
+
+   screen->surface_map = softpipe_surface_map;
+   screen->surface_unmap = softpipe_surface_unmap;
 }
diff --git a/src/gallium/drivers/softpipe/sp_texture.h b/src/gallium/drivers/softpipe/sp_texture.h
index a7322144e6..2ba093320d 100644
--- a/src/gallium/drivers/softpipe/sp_texture.h
+++ b/src/gallium/drivers/softpipe/sp_texture.h
@@ -61,7 +61,6 @@ softpipe_texture(struct pipe_texture *pt)
 extern void
 softpipe_init_texture_funcs( struct softpipe_context *softpipe );
 
-
 extern void
 softpipe_init_screen_texture_funcs(struct pipe_screen *screen);
 
diff --git a/src/gallium/drivers/softpipe/sp_tile_cache.c b/src/gallium/drivers/softpipe/sp_tile_cache.c
index a88aad5d09..a3fd375a2d 100644
--- a/src/gallium/drivers/softpipe/sp_tile_cache.c
+++ b/src/gallium/drivers/softpipe/sp_tile_cache.c
@@ -49,6 +49,7 @@
 
 struct softpipe_tile_cache
 {
+   struct pipe_screen *screen;
    struct pipe_surface *surface;  /**< the surface we're caching */
    void *surface_map;
    struct pipe_texture *texture;  /**< if caching a texture */
@@ -109,13 +110,14 @@ clear_clear_flag(uint *bitvec, int x, int y)
    
 
 struct softpipe_tile_cache *
-sp_create_tile_cache(void)
+sp_create_tile_cache( struct pipe_screen *screen )
 {
    struct softpipe_tile_cache *tc;
    uint pos;
 
    tc = CALLOC_STRUCT( softpipe_tile_cache );
    if (tc) {
+      tc->screen = screen;
       for (pos = 0; pos < NUM_ENTRIES; pos++) {
          tc->entries[pos].x =
          tc->entries[pos].y = -1;
@@ -154,16 +156,17 @@ sp_tile_cache_set_surface(struct softpipe_tile_cache *tc,
    assert(!tc->texture);
 
    if (tc->surface_map) {
-      /*assert(tc->surface != ps);*/
-      pipe_surface_unmap(tc->surface);
+      tc->screen->surface_unmap(tc->screen, tc->surface);
       tc->surface_map = NULL;
    }
 
    pipe_surface_reference(&tc->surface, ps);
 
-   if (ps) {
-      if (tc->surface_map)
-	 tc->surface_map = pipe_surface_map(ps);
+   if (tc->surface) {
+      if (tc->surface_map) /* XXX: this is always NULL!? */
+	 tc->surface_map = tc->screen->surface_map(tc->screen, tc->surface,
+                                                   PIPE_BUFFER_USAGE_GPU_READ | 
+                                                   PIPE_BUFFER_USAGE_GPU_WRITE);
 
       tc->depth_stencil = (ps->format == PIPE_FORMAT_S8Z24_UNORM ||
                            ps->format == PIPE_FORMAT_Z16_UNORM ||
@@ -187,10 +190,13 @@ void
 sp_tile_cache_map_surfaces(struct softpipe_tile_cache *tc)
 {
    if (tc->surface && !tc->surface_map)
-      tc->surface_map = pipe_surface_map(tc->surface);
+      tc->surface_map = tc->screen->surface_map(tc->screen, tc->surface,
+                                                PIPE_BUFFER_USAGE_GPU_WRITE |
+                                                PIPE_BUFFER_USAGE_GPU_READ);
 
    if (tc->tex_surf && !tc->tex_surf_map)
-      tc->tex_surf_map = pipe_surface_map(tc->tex_surf);
+      tc->tex_surf_map = tc->screen->surface_map(tc->screen, tc->tex_surf,
+                                                 PIPE_BUFFER_USAGE_GPU_READ);
 }
 
 
@@ -198,12 +204,12 @@ void
 sp_tile_cache_unmap_surfaces(struct softpipe_tile_cache *tc)
 {
    if (tc->surface_map) {
-      pipe_surface_unmap(tc->surface);
+      tc->screen->surface_unmap(tc->screen, tc->surface);
       tc->surface_map = NULL;
    }
 
    if (tc->tex_surf_map) {
-      pipe_surface_unmap(tc->tex_surf);
+      tc->screen->surface_unmap(tc->screen, tc->tex_surf);
       tc->tex_surf_map = NULL;
    }
 }
@@ -224,7 +230,7 @@ sp_tile_cache_set_texture(struct pipe_context *pipe,
    pipe_texture_reference(&tc->texture, texture);
 
    if (tc->tex_surf_map) {
-      pipe_surface_unmap(tc->tex_surf);
+      tc->screen->surface_unmap(tc->screen, tc->tex_surf);
       tc->tex_surf_map = NULL;
    }
    pipe_surface_reference(&tc->tex_surf, NULL);
@@ -514,10 +520,12 @@ sp_get_cached_tile_tex(struct pipe_context *pipe,
          /* get new surface (view into texture) */
 
 	 if (tc->tex_surf_map)
-            pipe_surface_unmap(tc->tex_surf);
+            tc->screen->surface_unmap(tc->screen, tc->tex_surf);
 
-         tc->tex_surf = screen->get_tex_surface(screen, tc->texture, face, level, z);
-         tc->tex_surf_map = pipe_surface_map(tc->tex_surf);
+         tc->tex_surf = screen->get_tex_surface(screen, tc->texture, face, level, z, 
+                                                PIPE_BUFFER_USAGE_GPU_READ);
+         tc->tex_surf_map = screen->surface_map(screen, tc->tex_surf,
+                                                PIPE_BUFFER_USAGE_GPU_READ);
 
          tc->tex_face = face;
          tc->tex_level = level;
diff --git a/src/gallium/drivers/softpipe/sp_tile_cache.h b/src/gallium/drivers/softpipe/sp_tile_cache.h
index 2631e29a3a..bc96c941f6 100644
--- a/src/gallium/drivers/softpipe/sp_tile_cache.h
+++ b/src/gallium/drivers/softpipe/sp_tile_cache.h
@@ -61,7 +61,7 @@ struct softpipe_cached_tile
 
 
 extern struct softpipe_tile_cache *
-sp_create_tile_cache(void);
+sp_create_tile_cache( struct pipe_screen *screen );
 
 extern void
 sp_destroy_tile_cache(struct softpipe_tile_cache *tc);
diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index f3a9c2cd8b..0f68f592f7 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -198,12 +198,6 @@ struct pipe_context {
    /*@}*/
 
 
-   /** Called when texture data is changed */
-   void (*texture_update)(struct pipe_context *pipe,
-                          struct pipe_texture *texture,
-                          uint face, uint dirtyLevelsMask);
-
-
    /** Flush rendering (flags = bitmask of PIPE_FLUSH_x tokens) */
    void (*flush)( struct pipe_context *pipe,
                   unsigned flags,
diff --git a/src/gallium/include/pipe/p_inlines.h b/src/gallium/include/pipe/p_inlines.h
index 8eb604e73f..592c3c87c2 100644
--- a/src/gallium/include/pipe/p_inlines.h
+++ b/src/gallium/include/pipe/p_inlines.h
@@ -39,20 +39,6 @@ extern "C" {
 #endif
 
 
-static INLINE void *
-pipe_surface_map(struct pipe_surface *surface)
-{
-   return (char *)surface->winsys->buffer_map( surface->winsys, surface->buffer,
-					       PIPE_BUFFER_USAGE_CPU_WRITE |
-					       PIPE_BUFFER_USAGE_CPU_READ )
-      + surface->offset;
-}
-
-static INLINE void
-pipe_surface_unmap(struct pipe_surface *surface)
-{
-   surface->winsys->buffer_unmap( surface->winsys, surface->buffer );
-}
 
 /**
  * Set 'ptr' to point to 'surf' and update reference counting.
@@ -66,9 +52,20 @@ pipe_surface_reference(struct pipe_surface **ptr, struct pipe_surface *surf)
    if (surf) 
       surf->refcount++;
 
-   if (*ptr /* && --(*ptr)->refcount == 0 */) {
-      struct pipe_winsys *winsys = (*ptr)->winsys;
-      winsys->surface_release(winsys, ptr);
+   if (*ptr) {
+
+      /* There are currently two sorts of surfaces... This needs to be
+       * fixed so that all surfaces are views into a texture.
+       */
+      if ((*ptr)->texture) {
+         struct pipe_screen *screen = (*ptr)->texture->screen;
+         screen->tex_surface_release( screen, ptr );
+      }
+      else {
+         struct pipe_winsys *winsys = (*ptr)->winsys;
+         winsys->surface_release(winsys, ptr);
+      }
+
       assert(!*ptr);
    }
 
diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index 26ac99d287..c080579c26 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -96,7 +96,22 @@ struct pipe_screen {
    struct pipe_surface *(*get_tex_surface)(struct pipe_screen *,
                                            struct pipe_texture *texture,
                                            unsigned face, unsigned level,
-                                           unsigned zslice);
+                                           unsigned zslice,
+                                           unsigned usage );
+
+   /* Surfaces allocated by the above must be released here:
+    */
+   void (*tex_surface_release)( struct pipe_screen *,
+                                struct pipe_surface ** );
+   
+
+   void *(*surface_map)( struct pipe_screen *,
+                         struct pipe_surface *surface,
+                         unsigned flags );
+
+   void (*surface_unmap)( struct pipe_screen *,
+                          struct pipe_surface *surface );
+   
 };
 
 
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 912d84e7b9..62b05a403b 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -273,7 +273,11 @@ struct pipe_surface
    unsigned pitch;               /**< in pixels */
    unsigned offset;              /**< offset from start of buffer, in bytes */
    unsigned refcount;
+   unsigned usage;              /**< PIPE_BUFFER_USAGE_*  */
+
    struct pipe_winsys *winsys;   /**< winsys which owns/created the surface */
+
+   struct pipe_texture *texture; /**< optional texture into which this is a view  */
 };
 
 
diff --git a/src/gallium/include/pipe/p_util.h b/src/gallium/include/pipe/p_util.h
index 0e7e246666..0d8ed167b2 100644
--- a/src/gallium/include/pipe/p_util.h
+++ b/src/gallium/include/pipe/p_util.h
@@ -204,7 +204,10 @@ mem_dup(const void *src, uint size)
 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 
+#ifndef Elements
 #define Elements(x) (sizeof(x)/sizeof((x)[0]))
+#endif
+
 #define Offset(TYPE, MEMBER) ((unsigned)&(((TYPE *)NULL)->MEMBER))
 
 /**
diff --git a/src/gallium/include/pipe/p_winsys.h b/src/gallium/include/pipe/p_winsys.h
index 3005ec2d94..87a66b66d7 100644
--- a/src/gallium/include/pipe/p_winsys.h
+++ b/src/gallium/include/pipe/p_winsys.h
@@ -90,7 +90,7 @@ struct pipe_winsys
    
    void (*surface_release)(struct pipe_winsys *ws, struct pipe_surface **s);
 
-   
+
    /**
     * Buffer management. Buffer attributes are mostly fixed over its lifetime.
     *
diff --git a/src/gallium/winsys/xlib/xm_winsys.c b/src/gallium/winsys/xlib/xm_winsys.c
index 8a89278cde..fd2f56eff2 100644
--- a/src/gallium/winsys/xlib/xm_winsys.c
+++ b/src/gallium/winsys/xlib/xm_winsys.c
@@ -508,6 +508,7 @@ xm_surface_alloc_storage(struct pipe_winsys *winsys,
    surf->format = format;
    surf->cpp = pf_get_size(format);
    surf->pitch = round_up(width, alignment / surf->cpp);
+   surf->usage = flags;
 
 #ifdef GALLIUM_CELL /* XXX a bit of a hack */
    height = round_up(height, TILE_SIZE);
@@ -562,6 +563,7 @@ static void
 xm_surface_release(struct pipe_winsys *winsys, struct pipe_surface **s)
 {
    struct pipe_surface *surf = *s;
+   assert(!surf->texture);
    surf->refcount--;
    if (surf->refcount == 0) {
       if (surf->buffer)