gallium: Alternative mm_bufmgr_create_from_buffer constructor for mm pool managers.

2 files changed, 37 insertions, 8 deletions

diff --git a/src/mesa/pipe/pipebuffer/pb_bufmgr.h b/src/mesa/pipe/pipebuffer/pb_bufmgr.h
index 0e6c3a8d37..12e36323a8 100644
--- a/src/mesa/pipe/pipebuffer/pb_bufmgr.h
+++ b/src/mesa/pipe/pipebuffer/pb_bufmgr.h
@@ -65,7 +65,7 @@ struct buffer_manager
    /* XXX: we will likely need more allocation flags */
    struct pipe_buffer *
    (*create_buffer)( struct buffer_manager *mgr, 
-	             size_t size);
+	             size_t size );
 
    void
    (*destroy)( struct buffer_manager *mgr );
@@ -96,6 +96,15 @@ struct buffer_manager *
 mm_bufmgr_create(struct buffer_manager *provider, 
                  size_t size, size_t align2);
 
+/**
+ * Same as mm_bufmgr_create.
+ * 
+ * Buffer will be release when the manager is destroyed.
+ */
+struct buffer_manager *
+mm_bufmgr_create_from_buffer(struct pipe_buffer *buffer, 
+                             size_t size, size_t align2);
+
 
 /** 
  * Fenced buffer manager.
diff --git a/src/mesa/pipe/pipebuffer/pb_bufmgr_mm.c b/src/mesa/pipe/pipebuffer/pb_bufmgr_mm.c
index 8e6dcf1116..e184655f1a 100644
--- a/src/mesa/pipe/pipebuffer/pb_bufmgr_mm.c
+++ b/src/mesa/pipe/pipebuffer/pb_bufmgr_mm.c
@@ -218,11 +218,14 @@ mm_bufmgr_destroy(struct buffer_manager *mgr)
 
 
 struct buffer_manager *
-mm_bufmgr_create(struct buffer_manager *provider, 
-                 size_t size, size_t align2) 
+mm_bufmgr_create_from_buffer(struct pipe_buffer *buffer, 
+                             size_t size, size_t align2) 
 {
    struct mm_buffer_manager *mm;
 
+   if(!buffer)
+      return NULL;
+   
    mm = (struct mm_buffer_manager *)calloc(1, sizeof(*mm));
    if (!mm)
       return NULL;
@@ -237,9 +240,7 @@ mm_bufmgr_create(struct buffer_manager *provider,
 
    _glthread_INIT_MUTEX(mm->mutex);
 
-   mm->buffer = provider->create_buffer(provider, size); 
-   if (!mm->buffer)
-      goto failure;
+   mm->buffer = buffer; 
 
    mm->map = buffer_map(mm->buffer, 
                         PIPE_BUFFER_FLAG_READ | PIPE_BUFFER_FLAG_WRITE );
@@ -257,9 +258,28 @@ if(mm->heap)
    mmDestroy(mm->heap);
    if(mm->map)
       buffer_unmap(mm->buffer);
-   if(mm->buffer)
-      buffer_release(mm->buffer);
    if(mm)
       free(mm);
    return NULL;
 }
+
+
+struct buffer_manager *
+mm_bufmgr_create(struct buffer_manager *provider, 
+                 size_t size, size_t align2) 
+{
+   struct pipe_buffer *buffer;
+   struct buffer_manager *mgr;
+
+   buffer = provider->create_buffer(provider, size); 
+   if (!buffer)
+      return NULL;
+   
+   mgr = mm_bufmgr_create_from_buffer(buffer, size, align2);
+   if (!mgr) {
+      buffer_release(buffer);
+      return NULL;
+   }
+
+  return mgr;
+}