mesa: allow buffers to be mapped multiple times

OpenGL allows a buffer to be mapped only once, but we also map buffers
internally, e.g. in the software primitive restart fallback, for PBOs,
vbo_get_minmax_index, etc. This has always been a problem, but it will
be a bigger problem with persistent buffer mappings, which will prevent
all Mesa functions from mapping buffers for internal purposes.

This adds a driver interface to core Mesa which supports multiple buffer
mappings and allows 2 mappings: one for the GL user and one for Mesa.

Note that Gallium supports an unlimited number of buffer and texture
mappings, so it's not really an issue for Gallium.

v2: fix unmapping in xm_dd.c, remove the GL errors there
v3: fix the intel driver (by Fredrik)

Reviewed-by: Fredrik Höglund <[email protected]>

31 files changed, 461 insertions, 384 deletions

diff --git a/src/mesa/drivers/dri/i915/intel_buffer_objects.c b/src/mesa/drivers/dri/i915/intel_buffer_objects.c
index f4fb9998cde..b93dd20ed01 100644
--- a/src/mesa/drivers/dri/i915/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/i915/intel_buffer_objects.c
@@ -40,7 +40,8 @@
 #include "intel_regions.h"
 
 static GLboolean
-intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj);
+intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj,
+                      gl_map_buffer_index index);
 
 /** Allocates a new drm_intel_bo to store the data for the buffer object. */
 static void
@@ -93,8 +94,7 @@ intel_bufferobj_free(struct gl_context * ctx, struct gl_buffer_object *obj)
     * to the spec, but Mesa doesn't do UnmapBuffer for us at context destroy
     * (though it does if you call glDeleteBuffers)
     */
-   if (obj->Pointer)
-      intel_bufferobj_unmap(ctx, obj);
+   _mesa_buffer_unmap_all_mappings(ctx, obj);
 
    free(intel_obj->sys_buffer);
 
@@ -127,7 +127,8 @@ intel_bufferobj_data(struct gl_context * ctx,
    intel_obj->Base.Usage = usage;
    intel_obj->Base.StorageFlags = storageFlags;
 
-   assert(!obj->Pointer); /* Mesa should have unmapped it */
+   assert(!obj->Mappings[MAP_USER].Pointer); /* Mesa should have unmapped it */
+   assert(!obj->Mappings[MAP_INTERNAL].Pointer);
 
    if (intel_obj->buffer != NULL)
       release_buffer(intel_obj);
@@ -272,7 +273,8 @@ intel_bufferobj_get_subdata(struct gl_context * ctx,
 static void *
 intel_bufferobj_map_range(struct gl_context * ctx,
 			  GLintptr offset, GLsizeiptr length,
-			  GLbitfield access, struct gl_buffer_object *obj)
+			  GLbitfield access, struct gl_buffer_object *obj,
+                          gl_map_buffer_index index)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
@@ -282,9 +284,9 @@ intel_bufferobj_map_range(struct gl_context * ctx,
    /* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
     * internally uses our functions directly.
     */
-   obj->Offset = offset;
-   obj->Length = length;
-   obj->AccessFlags = access;
+   obj->Mappings[index].Offset = offset;
+   obj->Mappings[index].Length = length;
+   obj->Mappings[index].AccessFlags = access;
 
    if (intel_obj->sys_buffer) {
       const bool read_only =
@@ -294,8 +296,8 @@ intel_bufferobj_map_range(struct gl_context * ctx,
 	 release_buffer(intel_obj);
 
       if (!intel_obj->buffer || intel_obj->source) {
-	 obj->Pointer = intel_obj->sys_buffer + offset;
-	 return obj->Pointer;
+	 obj->Mappings[index].Pointer = intel_obj->sys_buffer + offset;
+	 return obj->Mappings[index].Pointer;
       }
 
       free(intel_obj->sys_buffer);
@@ -303,7 +305,7 @@ intel_bufferobj_map_range(struct gl_context * ctx,
    }
 
    if (intel_obj->buffer == NULL) {
-      obj->Pointer = NULL;
+      obj->Mappings[index].Pointer = NULL;
       return NULL;
    }
 
@@ -346,23 +348,25 @@ intel_bufferobj_map_range(struct gl_context * ctx,
       const unsigned extra = (uintptr_t) offset % alignment;
 
       if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
-         intel_obj->range_map_buffer = _mesa_align_malloc(length + extra,
-                                                          alignment);
-         obj->Pointer = intel_obj->range_map_buffer + extra;
+         intel_obj->range_map_buffer[index] =
+            _mesa_align_malloc(length + extra, alignment);
+         obj->Mappings[index].Pointer =
+            intel_obj->range_map_buffer[index] + extra;
       } else {
-	 intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
-						      "range map",
-                                                      length + extra,
-                                                      alignment);
+	 intel_obj->range_map_bo[index] = drm_intel_bo_alloc(intel->bufmgr,
+                                                             "range map",
+                                                             length + extra,
+                                                             alignment);
 	 if (!(access & GL_MAP_READ_BIT)) {
-	    drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
+	    drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo[index]);
 	 } else {
-	    drm_intel_bo_map(intel_obj->range_map_bo,
+	    drm_intel_bo_map(intel_obj->range_map_bo[index],
 			     (access & GL_MAP_WRITE_BIT) != 0);
 	 }
-	 obj->Pointer = intel_obj->range_map_bo->virtual + extra;
+	 obj->Mappings[index].Pointer =
+            intel_obj->range_map_bo[index]->virtual + extra;
       }
-      return obj->Pointer;
+      return obj->Mappings[index].Pointer;
    }
 
    if (access & GL_MAP_UNSYNCHRONIZED_BIT)
@@ -373,8 +377,8 @@ intel_bufferobj_map_range(struct gl_context * ctx,
       drm_intel_bo_map(intel_obj->buffer, (access & GL_MAP_WRITE_BIT) != 0);
    }
 
-   obj->Pointer = intel_obj->buffer->virtual + offset;
-   return obj->Pointer;
+   obj->Mappings[index].Pointer = intel_obj->buffer->virtual + offset;
+   return obj->Mappings[index].Pointer;
 }
 
 /* Ideally we'd use a BO to avoid taking up cache space for the temporary
@@ -385,7 +389,8 @@ intel_bufferobj_map_range(struct gl_context * ctx,
 static void
 intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
 				   GLintptr offset, GLsizeiptr length,
-				   struct gl_buffer_object *obj)
+                                   struct gl_buffer_object *obj,
+                                   gl_map_buffer_index index)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
@@ -394,7 +399,7 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
    /* Unless we're in the range map using a temporary system buffer,
     * there's no work to do.
     */
-   if (intel_obj->range_map_buffer == NULL)
+   if (intel_obj->range_map_buffer[index] == NULL)
       return;
 
    if (length == 0)
@@ -406,10 +411,11 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
     * former points to the actual mapping while the latter may be offset to
     * meet alignment guarantees.
     */
-   drm_intel_bo_subdata(temp_bo, 0, length, obj->Pointer);
+   drm_intel_bo_subdata(temp_bo, 0, length, obj->Mappings[index].Pointer);
 
    intel_emit_linear_blit(intel,
-			  intel_obj->buffer, obj->Offset + offset,
+			  intel_obj->buffer,
+                          obj->Mappings[index].Offset + offset,
 			  temp_bo, 0,
 			  length);
 
@@ -421,33 +427,35 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
  * Called via glUnmapBuffer().
  */
 static GLboolean
-intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
+intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj,
+                      gl_map_buffer_index index)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 
    assert(intel_obj);
-   assert(obj->Pointer);
+   assert(obj->Mappings[index].Pointer);
    if (intel_obj->sys_buffer != NULL) {
       /* always keep the mapping around. */
-   } else if (intel_obj->range_map_buffer != NULL) {
+   } else if (intel_obj->range_map_buffer[index] != NULL) {
       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
        * flush.  Once again, we wish for a domain tracker in libdrm to cover
        * usage inside of a batchbuffer.
        */
       intel_batchbuffer_emit_mi_flush(intel);
-      _mesa_align_free(intel_obj->range_map_buffer);
-      intel_obj->range_map_buffer = NULL;
-   } else if (intel_obj->range_map_bo != NULL) {
-      const unsigned extra = obj->Pointer - intel_obj->range_map_bo->virtual;
+      _mesa_align_free(intel_obj->range_map_buffer[index]);
+      intel_obj->range_map_buffer[index] = NULL;
+   } else if (intel_obj->range_map_bo[index] != NULL) {
+      const unsigned extra = obj->Mappings[index].Pointer -
+                             intel_obj->range_map_bo[index]->virtual;
 
-      drm_intel_bo_unmap(intel_obj->range_map_bo);
+      drm_intel_bo_unmap(intel_obj->range_map_bo[index]);
 
       intel_emit_linear_blit(intel,
-			     intel_obj->buffer, obj->Offset,
-			     intel_obj->range_map_bo, extra,
-			     obj->Length);
+			     intel_obj->buffer, obj->Mappings[index].Offset,
+			     intel_obj->range_map_bo[index], extra,
+			     obj->Mappings[index].Length);
 
       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
@@ -456,14 +464,14 @@ intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
        */
       intel_batchbuffer_emit_mi_flush(intel);
 
-      drm_intel_bo_unreference(intel_obj->range_map_bo);
-      intel_obj->range_map_bo = NULL;
+      drm_intel_bo_unreference(intel_obj->range_map_bo[index]);
+      intel_obj->range_map_bo[index] = NULL;
    } else if (intel_obj->buffer != NULL) {
       drm_intel_bo_unmap(intel_obj->buffer);
    }
-   obj->Pointer = NULL;
-   obj->Offset = 0;
-   obj->Length = 0;
+   obj->Mappings[index].Pointer = NULL;
+   obj->Mappings[index].Offset = 0;
+   obj->Mappings[index].Length = 0;
 
    return true;
 }
@@ -607,22 +615,24 @@ intel_bufferobj_copy_subdata(struct gl_context *ctx,
 	 char *ptr = intel_bufferobj_map_range(ctx, 0, dst->Size,
 					       GL_MAP_READ_BIT |
 					       GL_MAP_WRITE_BIT,
-					       dst);
+					       dst, MAP_INTERNAL);
 	 memmove(ptr + write_offset, ptr + read_offset, size);
-	 intel_bufferobj_unmap(ctx, dst);
+	 intel_bufferobj_unmap(ctx, dst, MAP_INTERNAL);
       } else {
 	 const char *src_ptr;
 	 char *dst_ptr;
 
 	 src_ptr =  intel_bufferobj_map_range(ctx, 0, src->Size,
-					      GL_MAP_READ_BIT, src);
+					      GL_MAP_READ_BIT, src,
+                                              MAP_INTERNAL);
 	 dst_ptr =  intel_bufferobj_map_range(ctx, 0, dst->Size,
-					      GL_MAP_WRITE_BIT, dst);
+					      GL_MAP_WRITE_BIT, dst,
+                                              MAP_INTERNAL);
 
 	 memcpy(dst_ptr + write_offset, src_ptr + read_offset, size);
 
-	 intel_bufferobj_unmap(ctx, src);
-	 intel_bufferobj_unmap(ctx, dst);
+	 intel_bufferobj_unmap(ctx, src, MAP_INTERNAL);
+	 intel_bufferobj_unmap(ctx, dst, MAP_INTERNAL);
       }
       return;
    }
diff --git a/src/mesa/drivers/dri/i915/intel_buffer_objects.h b/src/mesa/drivers/dri/i915/intel_buffer_objects.h
index d2671f98c45..9ebfe4844e7 100644
--- a/src/mesa/drivers/dri/i915/intel_buffer_objects.h
+++ b/src/mesa/drivers/dri/i915/intel_buffer_objects.h
@@ -46,10 +46,8 @@ struct intel_buffer_object
    /** System memory buffer data, if not using a BO to store the data. */
    void *sys_buffer;
 
-   drm_intel_bo *range_map_bo;
-   void *range_map_buffer;
-   unsigned int range_map_offset;
-   GLsizei range_map_size;
+   drm_intel_bo *range_map_bo[MAP_COUNT];
+   void *range_map_buffer[MAP_COUNT];
 
    bool source;
 };
diff --git a/src/mesa/drivers/dri/i915/intel_pixel_bitmap.c b/src/mesa/drivers/dri/i915/intel_pixel_bitmap.c
index f4a2293e6da..ce8ea4c07b3 100644
--- a/src/mesa/drivers/dri/i915/intel_pixel_bitmap.c
+++ b/src/mesa/drivers/dri/i915/intel_pixel_bitmap.c
@@ -78,7 +78,8 @@ static const GLubyte *map_pbo( struct gl_context *ctx,
 
    buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0, unpack->BufferObj->Size,
 						GL_MAP_READ_BIT,
-						unpack->BufferObj);
+						unpack->BufferObj,
+                                                MAP_INTERNAL);
    if (!buf) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
       return NULL;
@@ -311,7 +312,7 @@ out:
 
    if (_mesa_is_bufferobj(unpack->BufferObj)) {
       /* done with PBO so unmap it now */
-      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
    }
 
    intel_check_front_buffer_rendering(intel);
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index cbaf67b4367..d42c074cd31 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -861,12 +861,13 @@ static void brw_upload_indices(struct brw_context *brw)
                                                     offset,
                                                     ib_size,
                                                     GL_MAP_READ_BIT,
-                                                    bufferobj);
+                                                    bufferobj,
+                                                    MAP_INTERNAL);
 
           intel_upload_data(brw, map, ib_size, ib_type_size, &bo, &offset);
           brw->ib.start_vertex_offset = offset / ib_type_size;
 
-          ctx->Driver.UnmapBuffer(ctx, bufferobj);
+          ctx->Driver.UnmapBuffer(ctx, bufferobj, MAP_INTERNAL);
        } else {
 	  /* Use CMD_3D_PRIM's start_vertex_offset to avoid re-uploading
 	   * the index buffer state when we're just moving the start index
diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.c b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
index c92ca2fcafe..bd7e88d8762 100644
--- a/src/mesa/drivers/dri/i965/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
@@ -82,7 +82,8 @@ brw_bo_map_gtt(struct brw_context *brw, drm_intel_bo *bo, const char *bo_name)
 }
 
 static GLboolean
-intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj);
+intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj,
+                      gl_map_buffer_index index);
 
 static void
 intel_bufferobj_mark_gpu_usage(struct intel_buffer_object *intel_obj,
@@ -159,8 +160,7 @@ intel_bufferobj_free(struct gl_context * ctx, struct gl_buffer_object *obj)
     * to the spec, but Mesa doesn't do UnmapBuffer for us at context destroy
     * (though it does if you call glDeleteBuffers)
     */
-   if (obj->Pointer)
-      intel_bufferobj_unmap(ctx, obj);
+   _mesa_buffer_unmap_all_mappings(ctx, obj);
 
    drm_intel_bo_unreference(intel_obj->buffer);
    free(intel_obj);
@@ -197,7 +197,8 @@ intel_bufferobj_data(struct gl_context * ctx,
    intel_obj->Base.Usage = usage;
    intel_obj->Base.StorageFlags = storageFlags;
 
-   assert(!obj->Pointer); /* Mesa should have unmapped it */
+   assert(!obj->Mappings[MAP_USER].Pointer); /* Mesa should have unmapped it */
+   assert(!obj->Mappings[MAP_INTERNAL].Pointer);
 
    if (intel_obj->buffer != NULL)
       release_buffer(intel_obj);
@@ -351,7 +352,8 @@ intel_bufferobj_get_subdata(struct gl_context * ctx,
 static void *
 intel_bufferobj_map_range(struct gl_context * ctx,
 			  GLintptr offset, GLsizeiptr length,
-			  GLbitfield access, struct gl_buffer_object *obj)
+			  GLbitfield access, struct gl_buffer_object *obj,
+                          gl_map_buffer_index index)
 {
    struct brw_context *brw = brw_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
@@ -361,12 +363,12 @@ intel_bufferobj_map_range(struct gl_context * ctx,
    /* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
     * internally uses our functions directly.
     */
-   obj->Offset = offset;
-   obj->Length = length;
-   obj->AccessFlags = access;
+   obj->Mappings[index].Offset = offset;
+   obj->Mappings[index].Length = length;
+   obj->Mappings[index].AccessFlags = access;
 
    if (intel_obj->buffer == NULL) {
-      obj->Pointer = NULL;
+      obj->Mappings[index].Pointer = NULL;
       return NULL;
    }
 
@@ -410,23 +412,25 @@ intel_bufferobj_map_range(struct gl_context * ctx,
       const unsigned extra = (uintptr_t) offset % alignment;
 
       if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
-         intel_obj->range_map_buffer = _mesa_align_malloc(length + extra,
-                                                          alignment);
-         obj->Pointer = intel_obj->range_map_buffer + extra;
+         intel_obj->range_map_buffer[index] = _mesa_align_malloc(length + extra,
+                                                                 alignment);
+         obj->Mappings[index].Pointer =
+            intel_obj->range_map_buffer[index] + extra;
       } else {
-	 intel_obj->range_map_bo = drm_intel_bo_alloc(brw->bufmgr,
-						      "range map",
-                                                      length + extra,
-                                                      alignment);
+	 intel_obj->range_map_bo[index] = drm_intel_bo_alloc(brw->bufmgr,
+                                                             "range map",
+                                                             length + extra,
+                                                             alignment);
 	 if (!(access & GL_MAP_READ_BIT)) {
-	    drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
+	    drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo[index]);
 	 } else {
-	    drm_intel_bo_map(intel_obj->range_map_bo,
+	    drm_intel_bo_map(intel_obj->range_map_bo[index],
 			     (access & GL_MAP_WRITE_BIT) != 0);
 	 }
-	 obj->Pointer = intel_obj->range_map_bo->virtual + extra;
+	 obj->Mappings[index].Pointer =
+            intel_obj->range_map_bo[index]->virtual + extra;
       }
-      return obj->Pointer;
+      return obj->Mappings[index].Pointer;
    }
 
    if (access & GL_MAP_UNSYNCHRONIZED_BIT)
@@ -439,8 +443,8 @@ intel_bufferobj_map_range(struct gl_context * ctx,
       intel_bufferobj_mark_inactive(intel_obj);
    }
 
-   obj->Pointer = intel_obj->buffer->virtual + offset;
-   return obj->Pointer;
+   obj->Mappings[index].Pointer = intel_obj->buffer->virtual + offset;
+   return obj->Mappings[index].Pointer;
 }
 
 /**
@@ -459,7 +463,8 @@ intel_bufferobj_map_range(struct gl_context * ctx,
 static void
 intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
 				   GLintptr offset, GLsizeiptr length,
-				   struct gl_buffer_object *obj)
+				   struct gl_buffer_object *obj,
+                                   gl_map_buffer_index index)
 {
    struct brw_context *brw = brw_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
@@ -468,7 +473,7 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
    /* Unless we're in the range map using a temporary system buffer,
     * there's no work to do.
     */
-   if (intel_obj->range_map_buffer == NULL)
+   if (intel_obj->range_map_buffer[index] == NULL)
       return;
 
    if (length == 0)
@@ -480,13 +485,16 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
     * former points to the actual mapping while the latter may be offset to
     * meet alignment guarantees.
     */
-   drm_intel_bo_subdata(temp_bo, 0, length, obj->Pointer);
+   drm_intel_bo_subdata(temp_bo, 0, length, obj->Mappings[index].Pointer);
 
    intel_emit_linear_blit(brw,
-			  intel_obj->buffer, obj->Offset + offset,
+			  intel_obj->buffer,
+                          obj->Mappings[index].Offset + offset,
 			  temp_bo, 0,
 			  length);
-   intel_bufferobj_mark_gpu_usage(intel_obj, obj->Offset + offset, length);
+   intel_bufferobj_mark_gpu_usage(intel_obj,
+                                  obj->Mappings[index].Offset + offset,
+                                  length);
 
    drm_intel_bo_unreference(temp_bo);
 }
@@ -498,32 +506,35 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
  * Implements glUnmapBuffer().
  */
 static GLboolean
-intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
+intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj,
+                      gl_map_buffer_index index)
 {
    struct brw_context *brw = brw_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 
    assert(intel_obj);
-   assert(obj->Pointer);
-   if (intel_obj->range_map_buffer != NULL) {
+   assert(obj->Mappings[index].Pointer);
+   if (intel_obj->range_map_buffer[index] != NULL) {
       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
        * flush.  Once again, we wish for a domain tracker in libdrm to cover
        * usage inside of a batchbuffer.
        */
       intel_batchbuffer_emit_mi_flush(brw);
-      _mesa_align_free(intel_obj->range_map_buffer);
-      intel_obj->range_map_buffer = NULL;
+      _mesa_align_free(intel_obj->range_map_buffer[index]);
+      intel_obj->range_map_buffer[index] = NULL;
    } else if (intel_obj->range_map_bo != NULL) {
-      const unsigned extra = obj->Pointer - intel_obj->range_map_bo->virtual;
+      const unsigned extra = obj->Mappings[index].Pointer -
+                             intel_obj->range_map_bo[index]->virtual;
 
-      drm_intel_bo_unmap(intel_obj->range_map_bo);
+      drm_intel_bo_unmap(intel_obj->range_map_bo[index]);
 
       intel_emit_linear_blit(brw,
-			     intel_obj->buffer, obj->Offset,
-			     intel_obj->range_map_bo, extra,
-			     obj->Length);
-      intel_bufferobj_mark_gpu_usage(intel_obj, obj->Offset, obj->Length);
+			     intel_obj->buffer, obj->Mappings[index].Offset,
+			     intel_obj->range_map_bo[index], extra,
+			     obj->Mappings[index].Length);
+      intel_bufferobj_mark_gpu_usage(intel_obj, obj->Mappings[index].Offset,
+                                     obj->Mappings[index].Length);
 
       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
@@ -532,14 +543,14 @@ intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
        */
       intel_batchbuffer_emit_mi_flush(brw);
 
-      drm_intel_bo_unreference(intel_obj->range_map_bo);
-      intel_obj->range_map_bo = NULL;
+      drm_intel_bo_unreference(intel_obj->range_map_bo[index]);
+      intel_obj->range_map_bo[index] = NULL;
    } else if (intel_obj->buffer != NULL) {
       drm_intel_bo_unmap(intel_obj->buffer);
    }
-   obj->Pointer = NULL;
-   obj->Offset = 0;
-   obj->Length = 0;
+   obj->Mappings[index].Pointer = NULL;
+   obj->Mappings[index].Offset = 0;
+   obj->Mappings[index].Length = 0;
 
    return true;
 }
diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.h b/src/mesa/drivers/dri/i965/intel_buffer_objects.h
index 3b6d8352702..2197707c8cc 100644
--- a/src/mesa/drivers/dri/i965/intel_buffer_objects.h
+++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.h
@@ -42,9 +42,8 @@ struct intel_buffer_object
    struct gl_buffer_object Base;
    drm_intel_bo *buffer;     /* the low-level buffer manager's buffer handle */
 
-   drm_intel_bo *range_map_bo;
-   void *range_map_buffer;
-   unsigned int range_map_offset;
+   drm_intel_bo *range_map_bo[MAP_COUNT];
+   void *range_map_buffer[MAP_COUNT];
 
    /** @{
     * Tracking for what range of the BO may currently be in use by the GPU.
diff --git a/src/mesa/drivers/dri/i965/intel_pixel_bitmap.c b/src/mesa/drivers/dri/i965/intel_pixel_bitmap.c
index a9674ca2db3..49a9bed1921 100644
--- a/src/mesa/drivers/dri/i965/intel_pixel_bitmap.c
+++ b/src/mesa/drivers/dri/i965/intel_pixel_bitmap.c
@@ -79,7 +79,8 @@ static const GLubyte *map_pbo( struct gl_context *ctx,
 
    buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0, unpack->BufferObj->Size,
 						GL_MAP_READ_BIT,
-						unpack->BufferObj);
+						unpack->BufferObj,
+                                                MAP_INTERNAL);
    if (!buf) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
       return NULL;
@@ -317,7 +318,7 @@ out:
 
    if (_mesa_is_bufferobj(unpack->BufferObj)) {
       /* done with PBO so unmap it now */
-      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
    }
 
    intel_check_front_buffer_rendering(brw);
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
index 783a152955f..9a3d41739b9 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
@@ -127,12 +127,13 @@ nouveau_bufferobj_get_subdata(struct gl_context *ctx, GLintptrARB offset,
 static void *
 nouveau_bufferobj_map_range(struct gl_context *ctx, GLintptr offset,
 			    GLsizeiptr length, GLbitfield access,
-			    struct gl_buffer_object *obj)
+			    struct gl_buffer_object *obj,
+                            gl_map_buffer_index index)
 {
 	unsigned flags = 0;
 	char *map;
 
-	assert(!obj->Pointer);
+	assert(!obj->Mappings[index].Pointer);
 
 	if (!(access & GL_MAP_UNSYNCHRONIZED_BIT)) {
 		if (access & GL_MAP_READ_BIT)
@@ -145,23 +146,24 @@ nouveau_bufferobj_map_range(struct gl_context *ctx, GLintptr offset,
 	if (!map)
 		return NULL;
 
-	obj->Pointer = map + offset;
-	obj->Offset = offset;
-	obj->Length = length;
-	obj->AccessFlags = access;
+	obj->Mappings[index].Pointer = map + offset;
+	obj->Mappings[index].Offset = offset;
+	obj->Mappings[index].Length = length;
+	obj->Mappings[index].AccessFlags = access;
 
-	return obj->Pointer;
+	return obj->Mappings[index].Pointer;
 }
 
 static GLboolean
-nouveau_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj)
+nouveau_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj,
+                        gl_map_buffer_index index)
 {
-	assert(obj->Pointer);
+	assert(obj->Mappings[index].Pointer);
 
-	obj->Pointer = NULL;
-	obj->Offset = 0;
-	obj->Length = 0;
-	obj->AccessFlags = 0;
+	obj->Mappings[index].Pointer = NULL;
+	obj->Mappings[index].Offset = 0;
+	obj->Mappings[index].Length = 0;
+	obj->Mappings[index].AccessFlags = 0;
 
 	return GL_TRUE;
 }
diff --git a/src/mesa/drivers/dri/radeon/radeon_buffer_objects.c b/src/mesa/drivers/dri/radeon/radeon_buffer_objects.c
index 7663178d63d..6294dbe1f98 100644
--- a/src/mesa/drivers/dri/radeon/radeon_buffer_objects.c
+++ b/src/mesa/drivers/dri/radeon/radeon_buffer_objects.c
@@ -60,9 +60,12 @@ radeonDeleteBufferObject(struct gl_context * ctx,
                          struct gl_buffer_object *obj)
 {
     struct radeon_buffer_object *radeon_obj = get_radeon_buffer_object(obj);
+    int i;
 
-    if (obj->Pointer) {
-        radeon_bo_unmap(radeon_obj->bo);
+    for (i = 0; i < MAP_COUNT; i++) {
+       if (obj->Mappings[i].Pointer) {
+           radeon_bo_unmap(radeon_obj->bo);
+       }
     }
 
     if (radeon_obj->bo) {
@@ -175,7 +178,8 @@ radeonGetBufferSubData(struct gl_context * ctx,
 static void *
 radeonMapBufferRange(struct gl_context * ctx,
 		     GLintptr offset, GLsizeiptr length,
-		     GLbitfield access, struct gl_buffer_object *obj)
+		     GLbitfield access, struct gl_buffer_object *obj,
+                     gl_map_buffer_index index)
 {
     struct radeon_buffer_object *radeon_obj = get_radeon_buffer_object(obj);
     const GLboolean write_only =
@@ -186,18 +190,18 @@ radeonMapBufferRange(struct gl_context * ctx,
     }
 
     if (radeon_obj->bo == NULL) {
-        obj->Pointer = NULL;
+        obj->Mappings[index].Pointer = NULL;
         return NULL;
     }
 
-    obj->Offset = offset;
-    obj->Length = length;
-    obj->AccessFlags = access;
+    obj->Mappings[index].Offset = offset;
+    obj->Mappings[index].Length = length;
+    obj->Mappings[index].AccessFlags = access;
 
     radeon_bo_map(radeon_obj->bo, write_only);
 
-    obj->Pointer = radeon_obj->bo->ptr + offset;
-    return obj->Pointer;
+    obj->Mappings[index].Pointer = radeon_obj->bo->ptr + offset;
+    return obj->Mappings[index].Pointer;
 }
 
 
@@ -206,7 +210,8 @@ radeonMapBufferRange(struct gl_context * ctx,
  */
 static GLboolean
 radeonUnmapBuffer(struct gl_context * ctx,
-                  struct gl_buffer_object *obj)
+                  struct gl_buffer_object *obj,
+                  gl_map_buffer_index index)
 {
     struct radeon_buffer_object *radeon_obj = get_radeon_buffer_object(obj);
 
@@ -214,9 +219,9 @@ radeonUnmapBuffer(struct gl_context * ctx,
         radeon_bo_unmap(radeon_obj->bo);
     }
 
-    obj->Pointer = NULL;
-    obj->Offset = 0;
-    obj->Length = 0;
+    obj->Mappings[index].Pointer = NULL;
+    obj->Mappings[index].Offset = 0;
+    obj->Mappings[index].Length = 0;
 
     return GL_TRUE;
 }
diff --git a/src/mesa/drivers/x11/xm_dd.c b/src/mesa/drivers/x11/xm_dd.c
index fc0b956743d..c0dcb61e234 100644
--- a/src/mesa/drivers/x11/xm_dd.c
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -366,12 +366,10 @@ xmesa_DrawPixels_8R8G8B( struct gl_context *ctx,
          buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0,
 						      unpack->BufferObj->Size,
 						      GL_MAP_READ_BIT,
-						      unpack->BufferObj);
+						      unpack->BufferObj,
+                                                      MAP_INTERNAL);
          if (!buf) {
-            /* buffer is already mapped - that's an error */
-            _mesa_error(ctx, GL_INVALID_OPERATION,
-                        "glDrawPixels(PBO is mapped)");
-            return;
+            return; /* error */
          }
          pixels = ADD_POINTERS(buf, pixels);
       }
@@ -417,7 +415,7 @@ xmesa_DrawPixels_8R8G8B( struct gl_context *ctx,
       }
 
       if (_mesa_is_bufferobj(unpack->BufferObj)) {
-         ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+         ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
       }
    }
    else {
@@ -500,12 +498,10 @@ xmesa_DrawPixels_5R6G5B( struct gl_context *ctx,
          buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0,
 						      unpack->BufferObj->Size,
 						      GL_MAP_READ_BIT,
-						      unpack->BufferObj);
+						      unpack->BufferObj,
+                                                      MAP_INTERNAL);
          if (!buf) {
-            /* buffer is already mapped - that's an error */
-            _mesa_error(ctx, GL_INVALID_OPERATION,
-                        "glDrawPixels(PBO is mapped)");
-            return;
+            return; /* error */
          }
          pixels = ADD_POINTERS(buf, pixels);
       }
@@ -550,7 +546,7 @@ xmesa_DrawPixels_5R6G5B( struct gl_context *ctx,
       }
 
       if (unpack->BufferObj->Name) {
-         ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+         ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
       }
    }
    else {
diff --git a/src/mesa/main/api_arrayelt.c b/src/mesa/main/api_arrayelt.c
index 29a57c8e51d..05cbc0f1f40 100644
--- a/src/mesa/main/api_arrayelt.c
+++ b/src/mesa/main/api_arrayelt.c
@@ -1458,7 +1458,8 @@ _ae_destroy_context(struct gl_context *ctx)
 static void
 check_vbo(AEcontext *actx, struct gl_buffer_object *vbo)
 {
-   if (_mesa_is_bufferobj(vbo) && !_mesa_bufferobj_mapped(vbo)) {
+   if (_mesa_is_bufferobj(vbo) &&
+       !_mesa_bufferobj_mapped(vbo, MAP_INTERNAL)) {
       GLuint i;
       for (i = 0; i < actx->nr_vbos; i++)
          if (actx->vbo[i] == vbo)
@@ -1633,7 +1634,8 @@ _ae_map_vbos(struct gl_context *ctx)
       ctx->Driver.MapBufferRange(ctx, 0,
 				 actx->vbo[i]->Size,
 				 GL_MAP_READ_BIT,
-				 actx->vbo[i]);
+				 actx->vbo[i],
+                                 MAP_INTERNAL);
 
    if (actx->nr_vbos)
       actx->mapped_vbos = GL_TRUE;
@@ -1655,7 +1657,7 @@ _ae_unmap_vbos(struct gl_context *ctx)
    assert (!actx->NewState);
 
    for (i = 0; i < actx->nr_vbos; i++)
-      ctx->Driver.UnmapBuffer(ctx, actx->vbo[i]);
+      ctx->Driver.UnmapBuffer(ctx, actx->vbo[i], MAP_INTERNAL);
 
    actx->mapped_vbos = GL_FALSE;
 }
@@ -1701,7 +1703,8 @@ _ae_ArrayElement(GLint elt)
    /* emit generic attribute elements */
    for (at = actx->attribs; at->func; at++) {
       const GLubyte *src
-         = ADD_POINTERS(at->array->BufferObj->Pointer, at->array->Ptr)
+         = ADD_POINTERS(at->array->BufferObj->Mappings[MAP_INTERNAL].Pointer,
+                        at->array->Ptr)
          + elt * at->array->StrideB;
       at->func(at->index, src);
    }
@@ -1709,7 +1712,8 @@ _ae_ArrayElement(GLint elt)
    /* emit conventional arrays elements */
    for (aa = actx->arrays; aa->offset != -1 ; aa++) {
       const GLubyte *src
-         = ADD_POINTERS(aa->array->BufferObj->Pointer, aa->array->Ptr)
+         = ADD_POINTERS(aa->array->BufferObj->Mappings[MAP_INTERNAL].Pointer,
+                        aa->array->Ptr)
          + elt * aa->array->StrideB;
       CALL_by_offset(disp, (array_func), aa->offset, ((const void *) src));
    }
diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index ce007e26598..f3fd1a47569 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -69,7 +69,8 @@ _mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type,
    if (_mesa_is_bufferobj(elementBuf)) {
       /* elements are in a user-defined buffer object.  need to map it */
       map = ctx->Driver.MapBufferRange(ctx, 0, elementBuf->Size,
-				       GL_MAP_READ_BIT, elementBuf);
+				       GL_MAP_READ_BIT, elementBuf,
+                                       MAP_INTERNAL);
       /* Actual address is the sum of pointers */
       indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
    }
@@ -92,7 +93,7 @@ _mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type,
    }
 
    if (map) {
-      ctx->Driver.UnmapBuffer(ctx, elementBuf);
+      ctx->Driver.UnmapBuffer(ctx, elementBuf, MAP_INTERNAL);
    }
 
    return max;
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 3079127ce6c..237b49cb1c7 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -207,11 +207,12 @@ static bool
 bufferobj_range_mapped(const struct gl_buffer_object *obj,
                        GLintptr offset, GLsizeiptr size)
 {
-   if (_mesa_bufferobj_mapped(obj)) {
+   if (_mesa_bufferobj_mapped(obj, MAP_USER)) {
       const GLintptr end = offset + size;
-      const GLintptr mapEnd = obj->Offset + obj->Length;
+      const GLintptr mapEnd = obj->Mappings[MAP_USER].Offset +
+                              obj->Mappings[MAP_USER].Length;
 
-      if (!(end <= obj->Offset || offset >= mapEnd)) {
+      if (!(end <= obj->Mappings[MAP_USER].Offset || offset >= mapEnd)) {
          return true;
       }
    }
@@ -269,7 +270,7 @@ buffer_object_subdata_range_good(struct gl_context * ctx, GLenum target,
       return NULL;
    }
 
-   if (bufObj->AccessFlags & GL_MAP_PERSISTENT_BIT)
+   if (bufObj->Mappings[MAP_USER].AccessFlags & GL_MAP_PERSISTENT_BIT)
       return bufObj;
 
    if (mappedRange) {
@@ -279,7 +280,7 @@ buffer_object_subdata_range_good(struct gl_context * ctx, GLenum target,
       }
    }
    else {
-      if (_mesa_bufferobj_mapped(bufObj)) {
+      if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
          _mesa_error(ctx, GL_INVALID_OPERATION, "%s", caller);
          return NULL;
       }
@@ -503,7 +504,6 @@ _mesa_initialize_buffer_object( struct gl_context *ctx,
    obj->RefCount = 1;
    obj->Name = name;
    obj->Usage = GL_STATIC_DRAW_ARB;
-   obj->AccessFlags = 0;
 }
 
 
@@ -675,33 +675,11 @@ _mesa_buffer_clear_subdata(struct gl_context *ctx,
    GLsizeiptr i;
    GLubyte *dest;
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
-      GLubyte *data = malloc(size);
-      GLubyte *dataStart = data;
-      if (data == NULL) {
-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClearBuffer[Sub]Data");
-         return;
-      }
-
-      if (clearValue == NULL) {
-         /* Clear with zeros, per the spec */
-         memset(data, 0, size);
-      }
-      else {
-         for (i = 0; i < size/clearValueSize; ++i) {
-            memcpy(data, clearValue, clearValueSize);
-            data += clearValueSize;
-         }
-      }
-      ctx->Driver.BufferSubData(ctx, offset, size, dataStart, bufObj);
-      return;
-   }
-
    ASSERT(ctx->Driver.MapBufferRange);
    dest = ctx->Driver.MapBufferRange(ctx, offset, size,
                                      GL_MAP_WRITE_BIT |
                                      GL_MAP_INVALIDATE_RANGE_BIT,
-                                     bufObj);
+                                     bufObj, MAP_INTERNAL);
 
    if (!dest) {
       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClearBuffer[Sub]Data");
@@ -711,7 +689,7 @@ _mesa_buffer_clear_subdata(struct gl_context *ctx,
    if (clearValue == NULL) {
       /* Clear with zeros, per the spec */
       memset(dest, 0, size);
-      ctx->Driver.UnmapBuffer(ctx, bufObj);
+      ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_INTERNAL);
       return;
    }
 
@@ -720,7 +698,7 @@ _mesa_buffer_clear_subdata(struct gl_context *ctx,
       dest += clearValueSize;
    }
 
-   ctx->Driver.UnmapBuffer(ctx, bufObj);
+   ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_INTERNAL);
 }
 
 
@@ -731,16 +709,17 @@ _mesa_buffer_clear_subdata(struct gl_context *ctx,
 static void *
 _mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
                         GLsizeiptr length, GLbitfield access,
-                        struct gl_buffer_object *bufObj )
+                        struct gl_buffer_object *bufObj,
+                        gl_map_buffer_index index)
 {
    (void) ctx;
-   assert(!_mesa_bufferobj_mapped(bufObj));
+   assert(!_mesa_bufferobj_mapped(bufObj, index));
    /* Just return a direct pointer to the data */
-   bufObj->Pointer = bufObj->Data + offset;
-   bufObj->Length = length;
-   bufObj->Offset = offset;
-   bufObj->AccessFlags = access;
-   return bufObj->Pointer;
+   bufObj->Mappings[index].Pointer = bufObj->Data + offset;
+   bufObj->Mappings[index].Length = length;
+   bufObj->Mappings[index].Offset = offset;
+   bufObj->Mappings[index].AccessFlags = access;
+   return bufObj->Mappings[index].Pointer;
 }
 
 
@@ -751,7 +730,8 @@ _mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
 static void
 _mesa_buffer_flush_mapped_range( struct gl_context *ctx,
                                  GLintptr offset, GLsizeiptr length,
-                                 struct gl_buffer_object *obj )
+                                 struct gl_buffer_object *obj,
+                                 gl_map_buffer_index index)
 {
    (void) ctx;
    (void) offset;
@@ -769,14 +749,15 @@ _mesa_buffer_flush_mapped_range( struct gl_context *ctx,
  * \sa glUnmapBufferARB, dd_function_table::UnmapBuffer
  */
 static GLboolean
-_mesa_buffer_unmap( struct gl_context *ctx, struct gl_buffer_object *bufObj )
+_mesa_buffer_unmap(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                   gl_map_buffer_index index)
 {
    (void) ctx;
    /* XXX we might assert here that bufObj->Pointer is non-null */
-   bufObj->Pointer = NULL;
-   bufObj->Length = 0;
-   bufObj->Offset = 0;
-   bufObj->AccessFlags = 0x0;
+   bufObj->Mappings[index].Pointer = NULL;
+   bufObj->Mappings[index].Length = 0;
+   bufObj->Mappings[index].Offset = 0;
+   bufObj->Mappings[index].AccessFlags = 0x0;
    return GL_TRUE;
 }
 
@@ -794,14 +775,11 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx,
 {
    GLubyte *srcPtr, *dstPtr;
 
-   /* the buffers should not be mapped */
-   assert(!_mesa_bufferobj_mapped(src));
-   assert(!_mesa_bufferobj_mapped(dst));
-
    if (src == dst) {
       srcPtr = dstPtr = ctx->Driver.MapBufferRange(ctx, 0, src->Size,
 						   GL_MAP_READ_BIT |
-						   GL_MAP_WRITE_BIT, src);
+						   GL_MAP_WRITE_BIT, src,
+                                                   MAP_INTERNAL);
 
       if (!srcPtr)
 	 return;
@@ -810,10 +788,12 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx,
       dstPtr += writeOffset;
    } else {
       srcPtr = ctx->Driver.MapBufferRange(ctx, readOffset, size,
-					  GL_MAP_READ_BIT, src);
+					  GL_MAP_READ_BIT, src,
+                                          MAP_INTERNAL);
       dstPtr = ctx->Driver.MapBufferRange(ctx, writeOffset, size,
 					  (GL_MAP_WRITE_BIT |
-					   GL_MAP_INVALIDATE_RANGE_BIT), dst);
+					   GL_MAP_INVALIDATE_RANGE_BIT), dst,
+                                          MAP_INTERNAL);
    }
 
    /* Note: the src and dst regions will never overlap.  Trying to do so
@@ -822,9 +802,9 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx,
    if (srcPtr && dstPtr)
       memcpy(dstPtr, srcPtr, size);
 
-   ctx->Driver.UnmapBuffer(ctx, src);
+   ctx->Driver.UnmapBuffer(ctx, src, MAP_INTERNAL);
    if (dst != src)
-      ctx->Driver.UnmapBuffer(ctx, dst);
+      ctx->Driver.UnmapBuffer(ctx, dst, MAP_INTERNAL);
 }
 
 
@@ -1039,6 +1019,21 @@ _mesa_init_buffer_object_functions(struct dd_function_table *driver)
 }
 
 
+void
+_mesa_buffer_unmap_all_mappings(struct gl_context *ctx,
+                                struct gl_buffer_object *bufObj)
+{
+   int i;
+
+   for (i = 0; i < MAP_COUNT; i++) {
+      if (_mesa_bufferobj_mapped(bufObj, i)) {
+         ctx->Driver.UnmapBuffer(ctx, bufObj, i);
+         ASSERT(bufObj->Mappings[i].Pointer == NULL);
+         bufObj->Mappings[i].AccessFlags = 0;
+      }
+   }
+}
+
 
 /**********************************************************************/
 /* API Functions                                                      */
@@ -1085,12 +1080,7 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
 
          ASSERT(bufObj->Name == ids[i] || bufObj == &DummyBufferObject);
 
-         if (_mesa_bufferobj_mapped(bufObj)) {
-            /* if mapped, unmap it now */
-            ctx->Driver.UnmapBuffer(ctx, bufObj);
-            bufObj->AccessFlags = 0;
-            bufObj->Pointer = NULL;
-         }
+         _mesa_buffer_unmap_all_mappings(ctx, bufObj);
 
          /* unbind any vertex pointers bound to this buffer */
          for (j = 0; j < Elements(vao->VertexBinding); j++) {
@@ -1278,12 +1268,8 @@ _mesa_BufferStorage(GLenum target, GLsizeiptr size, const GLvoid *data,
       return;
    }
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
-      /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
-      ctx->Driver.UnmapBuffer(ctx, bufObj);
-      bufObj->AccessFlags = 0;
-      ASSERT(bufObj->Pointer == NULL);
-   }
+   /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
+   _mesa_buffer_unmap_all_mappings(ctx, bufObj);
 
    FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
 
@@ -1355,12 +1341,8 @@ _mesa_BufferData(GLenum target, GLsizeiptrARB size,
       return;
    }
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
-      /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
-      ctx->Driver.UnmapBuffer(ctx, bufObj);
-      bufObj->AccessFlags = 0;
-      ASSERT(bufObj->Pointer == NULL);
-   }  
+   /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
+   _mesa_buffer_unmap_all_mappings(ctx, bufObj);
 
    FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
 
@@ -1594,7 +1576,7 @@ _mesa_MapBuffer(GLenum target, GLenum access)
       return NULL;
    }
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
+   if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glMapBufferARB(already mapped)");
       return NULL;
    }
@@ -1606,7 +1588,8 @@ _mesa_MapBuffer(GLenum target, GLenum access)
    }
 
    ASSERT(ctx->Driver.MapBufferRange);
-   map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj);
+   map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj,
+                                    MAP_USER);
    if (!map) {
       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
       return NULL;
@@ -1616,10 +1599,10 @@ _mesa_MapBuffer(GLenum target, GLenum access)
        * This is important because other modules (like VBO) might call
        * the driver function directly.
        */
-      ASSERT(bufObj->Pointer == map);
-      ASSERT(bufObj->Length == bufObj->Size);
-      ASSERT(bufObj->Offset == 0);
-      bufObj->AccessFlags = accessFlags;
+      ASSERT(bufObj->Mappings[MAP_USER].Pointer == map);
+      ASSERT(bufObj->Mappings[MAP_USER].Length == bufObj->Size);
+      ASSERT(bufObj->Mappings[MAP_USER].Offset == 0);
+      bufObj->Mappings[MAP_USER].AccessFlags = accessFlags;
    }
 
    if (access == GL_WRITE_ONLY_ARB || access == GL_READ_WRITE_ARB)
@@ -1647,7 +1630,7 @@ _mesa_MapBuffer(GLenum target, GLenum access)
    }
 #endif
 
-   return bufObj->Pointer;
+   return bufObj->Mappings[MAP_USER].Pointer;
 }
 
 
@@ -1663,7 +1646,7 @@ _mesa_UnmapBuffer(GLenum target)
    if (!bufObj)
       return GL_FALSE;
 
-   if (!_mesa_bufferobj_mapped(bufObj)) {
+   if (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glUnmapBufferARB");
       return GL_FALSE;
    }
@@ -1704,11 +1687,11 @@ _mesa_UnmapBuffer(GLenum target)
    }
 #endif
 
-   status = ctx->Driver.UnmapBuffer( ctx, bufObj );
-   bufObj->AccessFlags = 0;
-   ASSERT(bufObj->Pointer == NULL);
-   ASSERT(bufObj->Offset == 0);
-   ASSERT(bufObj->Length == 0);
+   status = ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_USER);
+   bufObj->Mappings[MAP_USER].AccessFlags = 0;
+   ASSERT(bufObj->Mappings[MAP_USER].Pointer == NULL);
+   ASSERT(bufObj->Mappings[MAP_USER].Offset == 0);
+   ASSERT(bufObj->Mappings[MAP_USER].Length == 0);
 
    return status;
 }
@@ -1733,25 +1716,26 @@ _mesa_GetBufferParameteriv(GLenum target, GLenum pname, GLint *params)
       *params = bufObj->Usage;
       return;
    case GL_BUFFER_ACCESS_ARB:
-      *params = simplified_access_mode(ctx, bufObj->AccessFlags);
+      *params = simplified_access_mode(ctx,
+                            bufObj->Mappings[MAP_USER].AccessFlags);
       return;
    case GL_BUFFER_MAPPED_ARB:
-      *params = _mesa_bufferobj_mapped(bufObj);
+      *params = _mesa_bufferobj_mapped(bufObj, MAP_USER);
       return;
    case GL_BUFFER_ACCESS_FLAGS:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = bufObj->AccessFlags;
+      *params = bufObj->Mappings[MAP_USER].AccessFlags;
       return;
    case GL_BUFFER_MAP_OFFSET:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = (GLint) bufObj->Offset;
+      *params = (GLint) bufObj->Mappings[MAP_USER].Offset;
       return;
    case GL_BUFFER_MAP_LENGTH:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = (GLint) bufObj->Length;
+      *params = (GLint) bufObj->Mappings[MAP_USER].Length;
       return;
    case GL_BUFFER_IMMUTABLE_STORAGE:
       if (!ctx->Extensions.ARB_buffer_storage)
@@ -1797,25 +1781,26 @@ _mesa_GetBufferParameteri64v(GLenum target, GLenum pname, GLint64 *params)
       *params = bufObj->Usage;
       return;
    case GL_BUFFER_ACCESS_ARB:
-      *params = simplified_access_mode(ctx, bufObj->AccessFlags);
+      *params = simplified_access_mode(ctx,
+                             bufObj->Mappings[MAP_USER].AccessFlags);
       return;
    case GL_BUFFER_ACCESS_FLAGS:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = bufObj->AccessFlags;
+      *params = bufObj->Mappings[MAP_USER].AccessFlags;
       return;
    case GL_BUFFER_MAPPED_ARB:
-      *params = _mesa_bufferobj_mapped(bufObj);
+      *params = _mesa_bufferobj_mapped(bufObj, MAP_USER);
       return;
    case GL_BUFFER_MAP_OFFSET:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = bufObj->Offset;
+      *params = bufObj->Mappings[MAP_USER].Offset;
       return;
    case GL_BUFFER_MAP_LENGTH:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = bufObj->Length;
+      *params = bufObj->Mappings[MAP_USER].Length;
       return;
    case GL_BUFFER_IMMUTABLE_STORAGE:
       if (!ctx->Extensions.ARB_buffer_storage)
@@ -1853,7 +1838,7 @@ _mesa_GetBufferPointerv(GLenum target, GLenum pname, GLvoid **params)
    if (!bufObj)
       return;
 
-   *params = bufObj->Pointer;
+   *params = bufObj->Mappings[MAP_USER].Pointer;
 }
 
 
@@ -2061,7 +2046,7 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
       return NULL;
    }
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
+   if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glMapBufferRange(buffer already mapped)");
       return NULL;
@@ -2076,15 +2061,16 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
    /* Mapping zero bytes should return a non-null pointer. */
    if (!length) {
       static long dummy = 0;
-      bufObj->Pointer = &dummy;
-      bufObj->Length = length;
-      bufObj->Offset = offset;
-      bufObj->AccessFlags = access;
-      return bufObj->Pointer;
+      bufObj->Mappings[MAP_USER].Pointer = &dummy;
+      bufObj->Mappings[MAP_USER].Length = length;
+      bufObj->Mappings[MAP_USER].Offset = offset;
+      bufObj->Mappings[MAP_USER].AccessFlags = access;
+      return bufObj->Mappings[MAP_USER].Pointer;
    }
 
    ASSERT(ctx->Driver.MapBufferRange);
-   map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj);
+   map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj,
+                                    MAP_USER);
    if (!map) {
       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
    }
@@ -2093,10 +2079,10 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
        * This is important because other modules (like VBO) might call
        * the driver function directly.
        */
-      ASSERT(bufObj->Pointer == map);
-      ASSERT(bufObj->Length == length);
-      ASSERT(bufObj->Offset == offset);
-      ASSERT(bufObj->AccessFlags == access);
+      ASSERT(bufObj->Mappings[MAP_USER].Pointer == map);
+      ASSERT(bufObj->Mappings[MAP_USER].Length == length);
+      ASSERT(bufObj->Mappings[MAP_USER].Offset == offset);
+      ASSERT(bufObj->Mappings[MAP_USER].AccessFlags == access);
    }
 
    return map;
@@ -2135,30 +2121,33 @@ _mesa_FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length)
    if (!bufObj)
       return;
 
-   if (!_mesa_bufferobj_mapped(bufObj)) {
+   if (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       /* buffer is not mapped */
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glFlushMappedBufferRange(buffer is not mapped)");
       return;
    }
 
-   if ((bufObj->AccessFlags & GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
+   if ((bufObj->Mappings[MAP_USER].AccessFlags &
+        GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glFlushMappedBufferRange(GL_MAP_FLUSH_EXPLICIT_BIT not set)");
       return;
    }
 
-   if (offset + length > bufObj->Length) {
+   if (offset + length > bufObj->Mappings[MAP_USER].Length) {
       _mesa_error(ctx, GL_INVALID_VALUE,
 		  "glFlushMappedBufferRange(offset %ld + length %ld > mapped length %ld)",
-		  (long)offset, (long)length, (long)bufObj->Length);
+		  (long)offset, (long)length,
+                  (long)bufObj->Mappings[MAP_USER].Length);
       return;
    }
 
-   ASSERT(bufObj->AccessFlags & GL_MAP_WRITE_BIT);
+   ASSERT(bufObj->Mappings[MAP_USER].AccessFlags & GL_MAP_WRITE_BIT);
 
    if (ctx->Driver.FlushMappedBufferRange)
-      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj);
+      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj,
+                                         MAP_USER);
 }
 
 
@@ -2812,7 +2801,7 @@ _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
     *     currently mapped by MapBufferRange, unless it was mapped
     *     with MAP_PERSISTENT_BIT set in the MapBufferRange access flags."
     */
-   if (!(bufObj->AccessFlags & GL_MAP_PERSISTENT_BIT) &&
+   if (!(bufObj->Mappings[MAP_USER].AccessFlags & GL_MAP_PERSISTENT_BIT) &&
        bufferobj_range_mapped(bufObj, offset, length)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glInvalidateBufferSubData(intersection with mapped "
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index 253a386c271..9814552eb96 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -37,19 +37,21 @@
  */
 
 
-/** Is the given buffer object currently mapped? */
+/** Is the given buffer object currently mapped by the GL user? */
 static inline GLboolean
-_mesa_bufferobj_mapped(const struct gl_buffer_object *obj)
+_mesa_bufferobj_mapped(const struct gl_buffer_object *obj,
+                       gl_map_buffer_index index)
 {
-   return obj->Pointer != NULL;
+   return obj->Mappings[index].Pointer != NULL;
 }
 
 /** Can we not use this buffer while mapped? */
 static inline GLboolean
 _mesa_check_disallowed_mapping(const struct gl_buffer_object *obj)
 {
-   return _mesa_bufferobj_mapped(obj) &&
-          !(obj->AccessFlags & GL_MAP_PERSISTENT_BIT);
+   return _mesa_bufferobj_mapped(obj, MAP_USER) &&
+          !(obj->Mappings[MAP_USER].AccessFlags &
+            GL_MAP_PERSISTENT_BIT);
 }
 
 /**
@@ -109,6 +111,9 @@ _mesa_total_buffer_object_memory(struct gl_context *ctx);
 extern void
 _mesa_init_buffer_object_functions(struct dd_function_table *driver);
 
+extern void
+_mesa_buffer_unmap_all_mappings(struct gl_context *ctx,
+                                struct gl_buffer_object *bufObj);
 
 /*
  * API functions
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index f1ba6000d02..9715241355d 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -605,14 +605,17 @@ struct dd_function_table {
     */
    void * (*MapBufferRange)( struct gl_context *ctx, GLintptr offset,
                              GLsizeiptr length, GLbitfield access,
-                             struct gl_buffer_object *obj);
+                             struct gl_buffer_object *obj,
+                             gl_map_buffer_index index);
 
    void (*FlushMappedBufferRange)(struct gl_context *ctx,
                                   GLintptr offset, GLsizeiptr length,
-                                  struct gl_buffer_object *obj);
+                                  struct gl_buffer_object *obj,
+                                  gl_map_buffer_index index);
 
    GLboolean (*UnmapBuffer)( struct gl_context *ctx,
-			     struct gl_buffer_object *obj );
+			     struct gl_buffer_object *obj,
+                             gl_map_buffer_index index);
    /*@}*/
 
    /**
diff --git a/src/mesa/main/dlist.c b/src/mesa/main/dlist.c
index 08943c9f9b0..0f4c89b8d20 100644
--- a/src/mesa/main/dlist.c
+++ b/src/mesa/main/dlist.c
@@ -914,7 +914,8 @@ unpack_image(struct gl_context *ctx, GLuint dimensions,
 
       map = (GLubyte *)
          ctx->Driver.MapBufferRange(ctx, 0, unpack->BufferObj->Size,
-				    GL_MAP_READ_BIT, unpack->BufferObj);
+				    GL_MAP_READ_BIT, unpack->BufferObj,
+                                    MAP_INTERNAL);
       if (!map) {
          /* unable to map src buffer! */
          _mesa_error(ctx, GL_INVALID_OPERATION, "unable to map PBO");
@@ -928,7 +929,7 @@ unpack_image(struct gl_context *ctx, GLuint dimensions,
          image = _mesa_unpack_image(dimensions, width, height, depth,
                                     format, type, src, unpack);
 
-      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
 
       if (!image) {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "display list construction");
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 5c39ac91238..7246b1e0556 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1439,6 +1439,25 @@ struct gl_viewport_attrib
 };
 
 
+typedef enum {
+   MAP_USER,
+   MAP_INTERNAL,
+
+   MAP_COUNT
+} gl_map_buffer_index;
+
+
+/**
+ * Fields describing a mapped buffer range.
+ */
+struct gl_buffer_mapping {
+   GLbitfield AccessFlags; /**< Mask of GL_MAP_x_BIT flags */
+   GLvoid *Pointer;     /**< User-space address of mapping */
+   GLintptr Offset;     /**< Mapped offset */
+   GLsizeiptr Length;   /**< Mapped length */
+};
+
+
 /**
  * GL_ARB_vertex/pixel_buffer_object buffer object
  */
@@ -1452,17 +1471,12 @@ struct gl_buffer_object
    GLbitfield StorageFlags; /**< GL_MAP_PERSISTENT_BIT, etc. */
    GLsizeiptrARB Size;  /**< Size of buffer storage in bytes */
    GLubyte *Data;       /**< Location of storage either in RAM or VRAM. */
-   /** Fields describing a mapped buffer */
-   /*@{*/
-   GLbitfield AccessFlags; /**< Mask of GL_MAP_x_BIT flags */
-   GLvoid *Pointer;     /**< User-space address of mapping */
-   GLintptr Offset;     /**< Mapped offset */
-   GLsizeiptr Length;   /**< Mapped length */
-   /*@}*/
    GLboolean DeletePending;   /**< true if buffer object is removed from the hash */
    GLboolean Written;   /**< Ever written to? (for debugging) */
    GLboolean Purgeable; /**< Is the buffer purgeable under memory pressure? */
    GLboolean Immutable; /**< GL_ARB_buffer_storage */
+
+   struct gl_buffer_mapping Mappings[MAP_COUNT];
 };
 
 
diff --git a/src/mesa/main/pbo.c b/src/mesa/main/pbo.c
index 4a394041778..a0d61a6436b 100644
--- a/src/mesa/main/pbo.c
+++ b/src/mesa/main/pbo.c
@@ -149,7 +149,8 @@ _mesa_map_pbo_source(struct gl_context *ctx,
       buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0,
 						   unpack->BufferObj->Size,
 						   GL_MAP_READ_BIT,
-						   unpack->BufferObj);
+						   unpack->BufferObj,
+                                                   MAP_INTERNAL);
       if (!buf)
          return NULL;
 
@@ -221,7 +222,7 @@ _mesa_unmap_pbo_source(struct gl_context *ctx,
 {
    ASSERT(unpack != &ctx->Pack); /* catch pack/unpack mismatch */
    if (_mesa_is_bufferobj(unpack->BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
    }
 }
 
@@ -246,7 +247,8 @@ _mesa_map_pbo_dest(struct gl_context *ctx,
       buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0,
 						   pack->BufferObj->Size,
 						   GL_MAP_WRITE_BIT,
-						   pack->BufferObj);
+						   pack->BufferObj,
+                                                   MAP_INTERNAL);
       if (!buf)
          return NULL;
 
@@ -317,7 +319,7 @@ _mesa_unmap_pbo_dest(struct gl_context *ctx,
 {
    ASSERT(pack != &ctx->Unpack); /* catch pack/unpack mismatch */
    if (_mesa_is_bufferobj(pack->BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, pack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, pack->BufferObj, MAP_INTERNAL);
    }
 }
 
@@ -351,7 +353,8 @@ _mesa_validate_pbo_teximage(struct gl_context *ctx, GLuint dimensions,
    buf = (GLubyte *) ctx->Driver.MapBufferRange(ctx, 0,
                                                 unpack->BufferObj->Size,
 						GL_MAP_READ_BIT,
-						unpack->BufferObj);
+						unpack->BufferObj,
+                                                MAP_INTERNAL);
    if (!buf) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s%uD(PBO is mapped)", funcName,
                   dimensions);
@@ -393,7 +396,8 @@ _mesa_validate_pbo_compressed_teximage(struct gl_context *ctx,
    buf = (GLubyte*) ctx->Driver.MapBufferRange(ctx, 0,
 					       packing->BufferObj->Size,
 					       GL_MAP_READ_BIT,
-					       packing->BufferObj);
+					       packing->BufferObj,
+                                               MAP_INTERNAL);
    if (!buf) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s%uD(PBO is mapped)", funcName,
                   dimensions);
@@ -413,6 +417,6 @@ _mesa_unmap_teximage_pbo(struct gl_context *ctx,
                          const struct gl_pixelstore_attrib *unpack)
 {
    if (_mesa_is_bufferobj(unpack->BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
    }
 }
diff --git a/src/mesa/main/shared.c b/src/mesa/main/shared.c
index c11c7f9e9eb..6a49348ce51 100644
--- a/src/mesa/main/shared.c
+++ b/src/mesa/main/shared.c
@@ -186,10 +186,8 @@ delete_bufferobj_cb(GLuint id, void *data, void *userData)
 {
    struct gl_buffer_object *bufObj = (struct gl_buffer_object *) data;
    struct gl_context *ctx = (struct gl_context *) userData;
-   if (_mesa_bufferobj_mapped(bufObj)) {
-      ctx->Driver.UnmapBuffer(ctx, bufObj);
-      bufObj->Pointer = NULL;
-   }
+
+   _mesa_buffer_unmap_all_mappings(ctx, bufObj);
    _mesa_reference_buffer_object(ctx, &bufObj, NULL);
 }
 
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index b21aa2cf25f..fedd814e932 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -635,7 +635,8 @@ _mesa_get_teximage(struct gl_context *ctx,
        */
       GLubyte *buf = (GLubyte *)
          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
-				    GL_MAP_WRITE_BIT, ctx->Pack.BufferObj);
+				    GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
+                                    MAP_INTERNAL);
       if (!buf) {
          /* out of memory or other unexpected error */
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
@@ -664,7 +665,7 @@ _mesa_get_teximage(struct gl_context *ctx,
    }
 
    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
    }
 }
 
@@ -689,7 +690,8 @@ _mesa_get_compressed_teximage(struct gl_context *ctx,
       /* pack texture image into a PBO */
       GLubyte *buf = (GLubyte *)
          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
-				    GL_MAP_WRITE_BIT, ctx->Pack.BufferObj);
+				    GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
+                                    MAP_INTERNAL);
       if (!buf) {
          /* out of memory or other unexpected error */
          _mesa_error(ctx, GL_OUT_OF_MEMORY,
@@ -731,7 +733,7 @@ _mesa_get_compressed_teximage(struct gl_context *ctx,
    }
 
    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj);
+      ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
    }
 }
 
diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c
index bf4c71f721e..49c4b903e59 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -76,7 +76,7 @@ st_bufferobj_free(struct gl_context *ctx, struct gl_buffer_object *obj)
    struct st_buffer_object *st_obj = st_buffer_object(obj);
 
    assert(obj->RefCount == 0);
-   assert(st_obj->transfer == NULL);
+   _mesa_buffer_unmap_all_mappings(ctx, obj);
 
    if (st_obj->buffer)
       pipe_resource_reference(&st_obj->buffer, NULL);
@@ -310,7 +310,8 @@ st_bufferobj_data(struct gl_context *ctx,
 static void *
 st_bufferobj_map_range(struct gl_context *ctx,
                        GLintptr offset, GLsizeiptr length, GLbitfield access,
-                       struct gl_buffer_object *obj)
+                       struct gl_buffer_object *obj,
+                       gl_map_buffer_index index)
 {
    struct pipe_context *pipe = st_context(ctx)->pipe;
    struct st_buffer_object *st_obj = st_buffer_object(obj);
@@ -355,28 +356,29 @@ st_bufferobj_map_range(struct gl_context *ctx,
    assert(offset < obj->Size);
    assert(offset + length <= obj->Size);
 
-   obj->Pointer = pipe_buffer_map_range(pipe,
+   obj->Mappings[index].Pointer = pipe_buffer_map_range(pipe,
                                         st_obj->buffer,
                                         offset, length,
                                         flags,
-                                        &st_obj->transfer);
-   if (obj->Pointer) {
-      obj->Offset = offset;
-      obj->Length = length;
-      obj->AccessFlags = access;
+                                        &st_obj->transfer[index]);
+   if (obj->Mappings[index].Pointer) {
+      obj->Mappings[index].Offset = offset;
+      obj->Mappings[index].Length = length;
+      obj->Mappings[index].AccessFlags = access;
    }
    else {
-      st_obj->transfer = NULL;
+      st_obj->transfer[index] = NULL;
    }
 
-   return obj->Pointer;
+   return obj->Mappings[index].Pointer;
 }
 
 
 static void
 st_bufferobj_flush_mapped_range(struct gl_context *ctx,
                                 GLintptr offset, GLsizeiptr length,
-                                struct gl_buffer_object *obj)
+                                struct gl_buffer_object *obj,
+                                gl_map_buffer_index index)
 {
    struct pipe_context *pipe = st_context(ctx)->pipe;
    struct st_buffer_object *st_obj = st_buffer_object(obj);
@@ -384,14 +386,15 @@ st_bufferobj_flush_mapped_range(struct gl_context *ctx,
    /* Subrange is relative to mapped range */
    assert(offset >= 0);
    assert(length >= 0);
-   assert(offset + length <= obj->Length);
-   assert(obj->Pointer);
+   assert(offset + length <= obj->Mappings[index].Length);
+   assert(obj->Mappings[index].Pointer);
 
    if (!length)
       return;
 
-   pipe_buffer_flush_mapped_range(pipe, st_obj->transfer,
-                                  obj->Offset + offset, length);
+   pipe_buffer_flush_mapped_range(pipe, st_obj->transfer[index],
+                                  obj->Mappings[index].Offset + offset,
+                                  length);
 }
 
 
@@ -399,18 +402,19 @@ st_bufferobj_flush_mapped_range(struct gl_context *ctx,
  * Called via glUnmapBufferARB().
  */
 static GLboolean
-st_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj)
+st_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj,
+                   gl_map_buffer_index index)
 {
    struct pipe_context *pipe = st_context(ctx)->pipe;
    struct st_buffer_object *st_obj = st_buffer_object(obj);
 
-   if (obj->Length)
-      pipe_buffer_unmap(pipe, st_obj->transfer);
+   if (obj->Mappings[index].Length)
+      pipe_buffer_unmap(pipe, st_obj->transfer[index]);
 
-   st_obj->transfer = NULL;
-   obj->Pointer = NULL;
-   obj->Offset = 0;
-   obj->Length = 0;
+   st_obj->transfer[index] = NULL;
+   obj->Mappings[index].Pointer = NULL;
+   obj->Mappings[index].Offset = 0;
+   obj->Mappings[index].Length = 0;
    return GL_TRUE;
 }
 
diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.h b/src/mesa/state_tracker/st_cb_bufferobjects.h
index a039c0a5059..a5ab122190a 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.h
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.h
@@ -43,7 +43,7 @@ struct st_buffer_object
 {
    struct gl_buffer_object Base;
    struct pipe_resource *buffer;     /* GPU storage */
-   struct pipe_transfer *transfer; /* In-progress map information */
+   struct pipe_transfer *transfer[MAP_COUNT];
 };
 
 
diff --git a/src/mesa/tnl/t_draw.c b/src/mesa/tnl/t_draw.c
index 8e5af96277f..2755ae62d49 100644
--- a/src/mesa/tnl/t_draw.c
+++ b/src/mesa/tnl/t_draw.c
@@ -279,17 +279,18 @@ static void bind_inputs( struct gl_context *ctx,
       const void *ptr;
 
       if (inputs[i]->BufferObj->Name) { 
-	 if (!inputs[i]->BufferObj->Pointer) {
+	 if (!inputs[i]->BufferObj->Mappings[MAP_INTERNAL].Pointer) {
 	    bo[*nr_bo] = inputs[i]->BufferObj;
 	    (*nr_bo)++;
 	    ctx->Driver.MapBufferRange(ctx, 0, inputs[i]->BufferObj->Size,
 				       GL_MAP_READ_BIT,
-				       inputs[i]->BufferObj);
+				       inputs[i]->BufferObj,
+                                       MAP_INTERNAL);
 	    
-	    assert(inputs[i]->BufferObj->Pointer);
+	    assert(inputs[i]->BufferObj->Mappings[MAP_INTERNAL].Pointer);
 	 }
 	 
-	 ptr = ADD_POINTERS(inputs[i]->BufferObj->Pointer,
+	 ptr = ADD_POINTERS(inputs[i]->BufferObj->Mappings[MAP_INTERNAL].Pointer,
 			    inputs[i]->Ptr);
       }
       else
@@ -348,17 +349,19 @@ static void bind_indices( struct gl_context *ctx,
       return;
    }
 
-   if (_mesa_is_bufferobj(ib->obj) && !_mesa_bufferobj_mapped(ib->obj)) {
+   if (_mesa_is_bufferobj(ib->obj) &&
+       !_mesa_bufferobj_mapped(ib->obj, MAP_INTERNAL)) {
       /* if the buffer object isn't mapped yet, map it now */
       bo[*nr_bo] = ib->obj;
       (*nr_bo)++;
       ptr = ctx->Driver.MapBufferRange(ctx, (GLsizeiptr) ib->ptr,
                                        ib->count * vbo_sizeof_ib_type(ib->type),
-				       GL_MAP_READ_BIT, ib->obj);
-      assert(ib->obj->Pointer);
+				       GL_MAP_READ_BIT, ib->obj,
+                                       MAP_INTERNAL);
+      assert(ib->obj->Mappings[MAP_INTERNAL].Pointer);
    } else {
       /* user-space elements, or buffer already mapped */
-      ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
+      ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
    }
 
    if (ib->type == GL_UNSIGNED_INT && VB->Primitive[0].basevertex == 0) {
@@ -403,7 +406,7 @@ static void unmap_vbos( struct gl_context *ctx,
 {
    GLuint i;
    for (i = 0; i < nr_bo; i++) { 
-      ctx->Driver.UnmapBuffer(ctx, bo[i]);
+      ctx->Driver.UnmapBuffer(ctx, bo[i], MAP_INTERNAL);
    }
 }
 
diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c
index 9858badebf1..74aec127c5c 100644
--- a/src/mesa/vbo/vbo_exec_api.c
+++ b/src/mesa/vbo/vbo_exec_api.c
@@ -1118,8 +1118,8 @@ void vbo_exec_vtx_destroy( struct vbo_exec_context *exec )
 
    /* Free the vertex buffer.  Unmap first if needed.
     */
-   if (_mesa_bufferobj_mapped(exec->vtx.bufferobj)) {
-      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
+   if (_mesa_bufferobj_mapped(exec->vtx.bufferobj, MAP_INTERNAL)) {
+      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
    }
    _mesa_reference_buffer_object(ctx, &exec->vtx.bufferobj, NULL);
 }
diff --git a/src/mesa/vbo/vbo_exec_array.c b/src/mesa/vbo/vbo_exec_array.c
index 32e1458bd2b..07ce08feff9 100644
--- a/src/mesa/vbo/vbo_exec_array.c
+++ b/src/mesa/vbo/vbo_exec_array.c
@@ -101,7 +101,8 @@ vbo_get_minmax_index(struct gl_context *ctx,
    if (_mesa_is_bufferobj(ib->obj)) {
       GLsizeiptr size = MIN2(count * index_size, ib->obj->Size);
       indices = ctx->Driver.MapBufferRange(ctx, (GLintptr) indices, size,
-                                           GL_MAP_READ_BIT, ib->obj);
+                                           GL_MAP_READ_BIT, ib->obj,
+                                           MAP_INTERNAL);
    }
 
    switch (ib->type) {
@@ -177,7 +178,7 @@ vbo_get_minmax_index(struct gl_context *ctx,
    }
 
    if (_mesa_is_bufferobj(ib->obj)) {
-      ctx->Driver.UnmapBuffer(ctx, ib->obj);
+      ctx->Driver.UnmapBuffer(ctx, ib->obj, MAP_INTERNAL);
    }
 }
 
@@ -229,13 +230,15 @@ check_array_data(struct gl_context *ctx, struct gl_client_array *array,
    if (array->Enabled) {
       const void *data = array->Ptr;
       if (_mesa_is_bufferobj(array->BufferObj)) {
-         if (!array->BufferObj->Pointer) {
+         if (!array->BufferObj->Mappings[MAP_INTERNAL].Pointer) {
             /* need to map now */
-            array->BufferObj->Pointer =
+            array->BufferObj->Mappings[MAP_INTERNAL].Pointer =
                ctx->Driver.MapBufferRange(ctx, 0, array->BufferObj->Size,
-					  GL_MAP_READ_BIT, array->BufferObj);
+					  GL_MAP_READ_BIT, array->BufferObj,
+                                          MAP_INTERNAL);
          }
-         data = ADD_POINTERS(data, array->BufferObj->Pointer);
+         data = ADD_POINTERS(data,
+                             array->BufferObj->Mappings[MAP_INTERNAL].Pointer);
       }
       switch (array->Type) {
       case GL_FLOAT:
@@ -273,8 +276,8 @@ unmap_array_buffer(struct gl_context *ctx, struct gl_client_array *array)
 {
    if (array->Enabled &&
        _mesa_is_bufferobj(array->BufferObj) &&
-       _mesa_bufferobj_mapped(array->BufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, array->BufferObj);
+       _mesa_bufferobj_mapped(array->BufferObj, MAP_INTERNAL)) {
+      ctx->Driver.UnmapBuffer(ctx, array->BufferObj, MAP_INTERNAL);
    }
 }
 
@@ -295,7 +298,8 @@ check_draw_elements_data(struct gl_context *ctx, GLsizei count, GLenum elemType,
       elemMap = ctx->Driver.MapBufferRange(ctx, 0,
 					   ctx->Array.VAO->IndexBufferObj->Size,
 					   GL_MAP_READ_BIT,
-					   ctx->Array.VAO->IndexBufferObj);
+					   ctx->Array.VAO->IndexBufferObj,
+                                           MAP_INTERNAL);
       elements = ADD_POINTERS(elements, elemMap);
    }
 
@@ -324,7 +328,8 @@ check_draw_elements_data(struct gl_context *ctx, GLsizei count, GLenum elemType,
    }
 
    if (_mesa_is_bufferobj(vao->IndexBufferObj)) {
-      ctx->Driver.UnmapBuffer(ctx, ctx->Array.VAO->IndexBufferObj);
+      ctx->Driver.UnmapBuffer(ctx, ctx->Array.VAO->IndexBufferObj,
+                              MAP_INTERNAL);
    }
 
    for (k = 0; k < Elements(vao->_VertexAttrib); k++) {
@@ -374,7 +379,8 @@ print_draw_arrays(struct gl_context *ctx,
 
       if (bufName) {
          GLubyte *p = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size,
-						 GL_MAP_READ_BIT, bufObj);
+						 GL_MAP_READ_BIT, bufObj,
+                                                 MAP_INTERNAL);
          int offset = (int) (GLintptr) exec->array.inputs[i]->Ptr;
          float *f = (float *) (p + offset);
          int *k = (int *) f;
@@ -386,7 +392,7 @@ print_draw_arrays(struct gl_context *ctx,
          for (i = 0; i < n; i++) {
             printf("    float[%d] = 0x%08x %f\n", i, k[i], f[i]);
          }
-         ctx->Driver.UnmapBuffer(ctx, bufObj);
+         ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_INTERNAL);
       }
    }
 }
@@ -885,7 +891,8 @@ dump_element_buffer(struct gl_context *ctx, GLenum type)
       ctx->Driver.MapBufferRange(ctx, 0,
 				 ctx->Array.VAO->IndexBufferObj->Size,
 				 GL_MAP_READ_BIT,
-				 ctx->Array.VAO->IndexBufferObj);
+                                 ctx->Array.VAO->IndexBufferObj,
+                                 MAP_INTERNAL);
    switch (type) {
    case GL_UNSIGNED_BYTE:
       {
@@ -927,7 +934,8 @@ dump_element_buffer(struct gl_context *ctx, GLenum type)
       ;
    }
 
-   ctx->Driver.UnmapBuffer(ctx, ctx->Array.VAO->IndexBufferObj);
+   ctx->Driver.UnmapBuffer(ctx, ctx->Array.VAO->IndexBufferObj,
+                           MAP_INTERNAL);
 }
 #endif
 
diff --git a/src/mesa/vbo/vbo_exec_draw.c b/src/mesa/vbo/vbo_exec_draw.c
index 46be65fc010..c454c6943b4 100644
--- a/src/mesa/vbo/vbo_exec_draw.c
+++ b/src/mesa/vbo/vbo_exec_draw.c
@@ -220,9 +220,10 @@ vbo_exec_bind_arrays( struct gl_context *ctx )
 
          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
             /* a real buffer obj: Ptr is an offset, not a pointer*/
-            assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
+            assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
             assert(offset >= 0);
-            arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
+            arrays[attr].Ptr = (GLubyte *)
+               exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
          }
          else {
             /* Ptr into ordinary app memory */
@@ -261,12 +262,15 @@ vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
       struct gl_context *ctx = exec->ctx;
       
       if (ctx->Driver.FlushMappedBufferRange) {
-         GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
-         GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);
+         GLintptr offset = exec->vtx.buffer_used -
+                           exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
+         GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
+                             sizeof(float);
 
          if (length)
             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
-                                               exec->vtx.bufferobj);
+                                               exec->vtx.bufferobj,
+                                               MAP_INTERNAL);
       }
 
       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
@@ -275,7 +279,7 @@ vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
       assert(exec->vtx.buffer_ptr != NULL);
       
-      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
+      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
       exec->vtx.buffer_map = NULL;
       exec->vtx.buffer_ptr = NULL;
       exec->vtx.max_vert = 0;
@@ -312,7 +316,8 @@ vbo_exec_vtx_map( struct vbo_exec_context *exec )
                                                   (VBO_VERT_BUFFER_SIZE - 
                                                    exec->vtx.buffer_used),
                                                   accessRange,
-                                                  exec->vtx.bufferobj);
+                                                  exec->vtx.bufferobj,
+                                                  MAP_INTERNAL);
          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
       }
       else {
@@ -336,7 +341,8 @@ vbo_exec_vtx_map( struct vbo_exec_context *exec )
             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
                                                   0, VBO_VERT_BUFFER_SIZE,
                                                   accessRange,
-                                                  exec->vtx.bufferobj);
+                                                  exec->vtx.bufferobj,
+                                                  MAP_INTERNAL);
       }
       else {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
diff --git a/src/mesa/vbo/vbo_primitive_restart.c b/src/mesa/vbo/vbo_primitive_restart.c
index 9c30554314c..25c89669ccf 100644
--- a/src/mesa/vbo/vbo_primitive_restart.c
+++ b/src/mesa/vbo/vbo_primitive_restart.c
@@ -177,7 +177,7 @@ vbo_sw_primitive_restart(struct gl_context *ctx,
    struct _mesa_prim temp_prim;
    struct vbo_context *vbo = vbo_context(ctx);
    vbo_draw_func draw_prims_func = vbo->draw_prims;
-   GLboolean map_ib = ib->obj->Name && !ib->obj->Pointer;
+   GLboolean map_ib = ib->obj->Name && !ib->obj->Mappings[MAP_INTERNAL].Pointer;
    void *ptr;
 
    /* If there is an indirect buffer, map it and extract the draw params */
@@ -186,7 +186,7 @@ vbo_sw_primitive_restart(struct gl_context *ctx,
       struct _mesa_index_buffer new_ib = *ib;
       const uint32_t *indirect_params;
       if (!ctx->Driver.MapBufferRange(ctx, 0, indirect->Size, GL_MAP_READ_BIT,
-            indirect)) {
+                                      indirect, MAP_INTERNAL)) {
 
          /* something went wrong with mapping, give up */
          _mesa_error(ctx, GL_OUT_OF_MEMORY,
@@ -195,8 +195,9 @@ vbo_sw_primitive_restart(struct gl_context *ctx,
       }
 
       assert(nr_prims == 1);
-      indirect_params = (const uint32_t *) ADD_POINTERS(indirect->Pointer,
-            new_prim.indirect_offset);
+      indirect_params = (const uint32_t *)
+                        ADD_POINTERS(indirect->Mappings[MAP_INTERNAL].Pointer,
+                                     new_prim.indirect_offset);
 
       new_prim.is_indirect = 0;
       new_prim.count = indirect_params[0];
@@ -210,7 +211,7 @@ vbo_sw_primitive_restart(struct gl_context *ctx,
       prims = &new_prim;
       ib = &new_ib;
 
-      ctx->Driver.UnmapBuffer(ctx, indirect);
+      ctx->Driver.UnmapBuffer(ctx, indirect, MAP_INTERNAL);
    }
 
    /* Find the sub-primitives. These are regions in the index buffer which
@@ -218,17 +219,17 @@ vbo_sw_primitive_restart(struct gl_context *ctx,
     */
    if (map_ib) {
       ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
-                                 ib->obj);
+                                 ib->obj, MAP_INTERNAL);
    }
 
-   ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
+   ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
 
    sub_prims = find_sub_primitives(ptr, vbo_sizeof_ib_type(ib->type),
                                    0, ib->count, restart_index,
                                    &num_sub_prims);
 
    if (map_ib) {
-      ctx->Driver.UnmapBuffer(ctx, ib->obj);
+      ctx->Driver.UnmapBuffer(ctx, ib->obj, MAP_INTERNAL);
    }
 
    /* Loop over the primitives, and use the located sub-primitives to draw
diff --git a/src/mesa/vbo/vbo_rebase.c b/src/mesa/vbo/vbo_rebase.c
index c700621cef2..f3fe5f75708 100644
--- a/src/mesa/vbo/vbo_rebase.c
+++ b/src/mesa/vbo/vbo_rebase.c
@@ -157,15 +157,16 @@ void vbo_rebase_prims( struct gl_context *ctx,
    } else if (ib) {
       /* Unfortunately need to adjust each index individually.
        */
-      GLboolean map_ib = ib->obj->Name && !ib->obj->Pointer;
+      GLboolean map_ib = ib->obj->Name &&
+                         !ib->obj->Mappings[MAP_INTERNAL].Pointer;
       void *ptr;
 
       if (map_ib) 
 	 ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
-				    ib->obj);
+				    ib->obj, MAP_INTERNAL);
 
 
-      ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
+      ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
 
       /* Some users might prefer it if we translated elements to
        * GLuints here.  Others wouldn't...
@@ -183,7 +184,7 @@ void vbo_rebase_prims( struct gl_context *ctx,
       }      
 
       if (map_ib) 
-	 ctx->Driver.UnmapBuffer(ctx, ib->obj);
+	 ctx->Driver.UnmapBuffer(ctx, ib->obj, MAP_INTERNAL);
 
       tmp_ib.obj = ctx->Shared->NullBufferObj;
       tmp_ib.ptr = tmp_indices;
diff --git a/src/mesa/vbo/vbo_save_api.c b/src/mesa/vbo/vbo_save_api.c
index b86ced5bf89..1c6b91942d5 100644
--- a/src/mesa/vbo/vbo_save_api.c
+++ b/src/mesa/vbo/vbo_save_api.c
@@ -253,7 +253,8 @@ vbo_save_map_vertex_store(struct gl_context *ctx,
       GLsizeiptr size = vertex_store->bufferobj->Size - offset;
       GLfloat *range = (GLfloat *)
          ctx->Driver.MapBufferRange(ctx, offset, size, access,
-                                    vertex_store->bufferobj);
+                                    vertex_store->bufferobj,
+                                    MAP_INTERNAL);
       if (range) {
          /* compute address of start of whole buffer (needed elsewhere) */
          vertex_store->buffer = range - vertex_store->used;
@@ -279,13 +280,14 @@ vbo_save_unmap_vertex_store(struct gl_context *ctx,
    if (vertex_store->bufferobj->Size > 0) {
       GLintptr offset = 0;
       GLsizeiptr length = vertex_store->used * sizeof(GLfloat)
-         - vertex_store->bufferobj->Offset;
+         - vertex_store->bufferobj->Mappings[MAP_INTERNAL].Offset;
 
       /* Explicitly flush the region we wrote to */
       ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
-                                         vertex_store->bufferobj);
+                                         vertex_store->bufferobj,
+                                         MAP_INTERNAL);
 
-      ctx->Driver.UnmapBuffer(ctx, vertex_store->bufferobj);
+      ctx->Driver.UnmapBuffer(ctx, vertex_store->bufferobj, MAP_INTERNAL);
    }
    vertex_store->buffer = NULL;
 }
@@ -1118,6 +1120,7 @@ _save_OBE_DrawElements(GLenum mode, GLsizei count, GLenum type,
 {
    GET_CURRENT_CONTEXT(ctx);
    struct vbo_save_context *save = &vbo_context(ctx)->save;
+   struct gl_buffer_object *indexbuf = ctx->Array.VAO->IndexBufferObj;
    GLint i;
 
    if (!_mesa_is_valid_prim_mode(ctx, mode)) {
@@ -1140,9 +1143,9 @@ _save_OBE_DrawElements(GLenum mode, GLsizei count, GLenum type,
 
    _ae_map_vbos(ctx);
 
-   if (_mesa_is_bufferobj(ctx->Array.VAO->IndexBufferObj))
+   if (_mesa_is_bufferobj(indexbuf))
       indices =
-         ADD_POINTERS(ctx->Array.VAO->IndexBufferObj->Pointer, indices);
+         ADD_POINTERS(indexbuf->Mappings[MAP_INTERNAL].Pointer, indices);
 
    vbo_save_NotifyBegin(ctx, (mode | VBO_SAVE_PRIM_WEAK |
                               VBO_SAVE_PRIM_NO_CURRENT_UPDATE));
diff --git a/src/mesa/vbo/vbo_save_draw.c b/src/mesa/vbo/vbo_save_draw.c
index 4b13cc4e5d0..89fd30e0fb1 100644
--- a/src/mesa/vbo/vbo_save_draw.c
+++ b/src/mesa/vbo/vbo_save_draw.c
@@ -225,7 +225,8 @@ vbo_save_loopback_vertex_list(struct gl_context *ctx,
       ctx->Driver.MapBufferRange(ctx, 0,
 				 list->vertex_store->bufferobj->Size,
 				 GL_MAP_READ_BIT, /* ? */
-				 list->vertex_store->bufferobj);
+				 list->vertex_store->bufferobj,
+                                 MAP_INTERNAL);
 
    vbo_loopback_vertex_list(ctx,
                             (const GLfloat *)(buffer + list->buffer_offset),
@@ -235,7 +236,8 @@ vbo_save_loopback_vertex_list(struct gl_context *ctx,
                             list->wrap_count,
                             list->vertex_size);
 
-   ctx->Driver.UnmapBuffer(ctx, list->vertex_store->bufferobj);
+   ctx->Driver.UnmapBuffer(ctx, list->vertex_store->bufferobj,
+                           MAP_INTERNAL);
 }
 
 
diff --git a/src/mesa/vbo/vbo_split_copy.c b/src/mesa/vbo/vbo_split_copy.c
index 4332ef2e6d7..719ad651a89 100644
--- a/src/mesa/vbo/vbo_split_copy.c
+++ b/src/mesa/vbo/vbo_split_copy.c
@@ -451,11 +451,14 @@ replay_init( struct copy_context *copy )
 	 copy->varying[j].size = attr_size(copy->array[i]);
 	 copy->vertex_size += attr_size(copy->array[i]);
       
-	 if (_mesa_is_bufferobj(vbo) && !_mesa_bufferobj_mapped(vbo)) 
-	    ctx->Driver.MapBufferRange(ctx, 0, vbo->Size, GL_MAP_READ_BIT, vbo);
+	 if (_mesa_is_bufferobj(vbo) &&
+             !_mesa_bufferobj_mapped(vbo, MAP_INTERNAL))
+	    ctx->Driver.MapBufferRange(ctx, 0, vbo->Size, GL_MAP_READ_BIT, vbo,
+                                       MAP_INTERNAL);
 
-	 copy->varying[j].src_ptr = ADD_POINTERS(vbo->Pointer,
-						 copy->array[i]->Ptr);
+	 copy->varying[j].src_ptr =
+               ADD_POINTERS(vbo->Mappings[MAP_INTERNAL].Pointer,
+                            copy->array[i]->Ptr);
 
 	 copy->dstarray_ptr[i] = &copy->varying[j].dstarray;
       }
@@ -466,12 +469,13 @@ replay_init( struct copy_context *copy )
     * do it internally.
     */
    if (_mesa_is_bufferobj(copy->ib->obj) &&
-       !_mesa_bufferobj_mapped(copy->ib->obj)) 
+       !_mesa_bufferobj_mapped(copy->ib->obj, MAP_INTERNAL))
       ctx->Driver.MapBufferRange(ctx, 0, copy->ib->obj->Size, GL_MAP_READ_BIT,
-				 copy->ib->obj);
+				 copy->ib->obj, MAP_INTERNAL);
 
-   srcptr = (const GLubyte *) ADD_POINTERS(copy->ib->obj->Pointer,
-                                           copy->ib->ptr);
+   srcptr = (const GLubyte *)
+            ADD_POINTERS(copy->ib->obj->Mappings[MAP_INTERNAL].Pointer,
+                         copy->ib->ptr);
 
    switch (copy->ib->type) {
    case GL_UNSIGNED_BYTE:
@@ -572,15 +576,15 @@ replay_finish( struct copy_context *copy )
     */
    for (i = 0; i < copy->nr_varying; i++) {
       struct gl_buffer_object *vbo = copy->varying[i].array->BufferObj;
-      if (_mesa_is_bufferobj(vbo) && _mesa_bufferobj_mapped(vbo)) 
-	 ctx->Driver.UnmapBuffer(ctx, vbo);
+      if (_mesa_is_bufferobj(vbo) && _mesa_bufferobj_mapped(vbo, MAP_INTERNAL))
+	 ctx->Driver.UnmapBuffer(ctx, vbo, MAP_INTERNAL);
    }
 
    /* Unmap index buffer:
     */
    if (_mesa_is_bufferobj(copy->ib->obj) &&
-       _mesa_bufferobj_mapped(copy->ib->obj)) {
-      ctx->Driver.UnmapBuffer(ctx, copy->ib->obj);
+       _mesa_bufferobj_mapped(copy->ib->obj, MAP_INTERNAL)) {
+      ctx->Driver.UnmapBuffer(ctx, copy->ib->obj, MAP_INTERNAL);
    }
 }