gallium: Reusable pipe buffer library.

This is an optional library that winsys drivers can use to simplify memory
management, and help meet the winsys interface requirements.

1 files changed, 182 insertions, 0 deletions

diff --git a/src/mesa/pipe/pipebuffer/pb_buffer_handle.c b/src/mesa/pipe/pipebuffer/pb_buffer_handle.c
new file mode 100644
index 0000000000..5a5eaee7ac
--- /dev/null
+++ b/src/mesa/pipe/pipebuffer/pb_buffer_handle.c
@@ -0,0 +1,182 @@
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * \file
+ * Drop-in implementation of the winsys driver functions for buffer handles.
+ * 
+ * \author José Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "pipe/p_winsys.h"
+#include "pipe/p_defines.h"
+
+#include "pb_buffer.h"
+#include "pb_buffer_handle.h"
+
+
+static struct pipe_buffer_handle *
+buffer_handle_create(struct pipe_winsys *winsys,
+                     unsigned alignment,
+                     unsigned flags,
+                     unsigned hint)
+{
+   struct pipe_buffer_handle *handle;
+  
+   handle = (struct pipe_buffer_handle *)malloc(sizeof(struct pipe_buffer_handle));
+   if(!handle)
+      return NULL;
+   
+   handle->refcount = 1;
+   handle->alignment = alignment;
+   handle->flags = flags;
+   handle->hint = hint;
+   
+   handle->buf = &null_buffer;
+   
+   return handle;
+}
+
+
+static struct pipe_buffer_handle *
+buffer_handle_create_user(struct pipe_winsys *winsys, 
+                          void *data, unsigned size)
+{
+   struct pipe_buffer_handle *handle;
+   struct pipe_buffer *buf;
+   
+   handle = buffer_handle_create(winsys, 1, 0, 0);
+   if(!handle)
+      return NULL;
+   
+   buf = client_buffer_create(data);
+   if(!buf) {
+      free(handle);
+      return NULL;
+   }
+   
+   buffer_handle_data(handle, buf);
+   
+   return handle;
+}
+
+
+static void *
+buffer_handle_map(struct pipe_winsys *winsys,
+                  struct pipe_buffer_handle *handle, 
+                  unsigned flags)
+{
+   return buffer_map(handle->buf, flags);
+}
+
+
+static void 
+buffer_handle_unmap(struct pipe_winsys *winsys,
+                    struct pipe_buffer_handle *handle)
+{
+   buffer_unmap(handle->buf);
+}
+
+
+static void
+buffer_handle_reference(struct pipe_winsys *winsys,
+                        struct pipe_buffer_handle **dst,
+		        struct pipe_buffer_handle *src)
+{
+   /* XXX: should this be thread safe? */
+   
+   if (src) {
+      src->refcount++;
+   }
+   
+   if (*dst) {
+      (*dst)->refcount--;
+      if ((*dst)->refcount == 0) {
+	 buffer_release((*dst)->buf);
+	 free(*dst);
+      }
+   }
+
+   *dst = src;
+}
+
+
+static int 
+buffer_handle_subdata(struct pipe_winsys *winsys, 
+                      struct pipe_buffer_handle *handle,
+                      unsigned long offset, 
+                      unsigned long size, 
+                      const void *data)
+{
+   void *map;
+   assert(handle);
+   assert(data);
+   map = buffer_handle_map(winsys, handle, PIPE_BUFFER_FLAG_WRITE);
+   if(map) {
+      memcpy((char *)map + offset, data, size);
+      buffer_handle_unmap(winsys, handle);
+      return 0;
+   }
+   return -1; 
+}
+
+
+static int  
+buffer_handle_get_subdata(struct pipe_winsys *winsys,
+                          struct pipe_buffer_handle *handle,
+                          unsigned long offset, 
+                          unsigned long size, 
+                          void *data)
+{
+   void *map;
+   assert(handle);
+   assert(data);
+   map = buffer_handle_map(winsys, handle, PIPE_BUFFER_FLAG_READ);
+   if(map) {
+      memcpy(data, (char *)map + offset, size);
+      buffer_handle_unmap(winsys, handle);
+      return 0;
+   }
+   return -1; 
+}
+
+
+void 
+buffer_handle_init_winsys(struct pipe_winsys *winsys)
+{
+   winsys->buffer_create = buffer_handle_create;
+   winsys->user_buffer_create = buffer_handle_create_user;
+   winsys->buffer_map = buffer_handle_map;
+   winsys->buffer_unmap = buffer_handle_unmap;
+   winsys->buffer_reference = buffer_handle_reference;
+   winsys->buffer_subdata = buffer_handle_subdata;
+   winsys->buffer_get_subdata = buffer_handle_get_subdata;
+}