softpipe/winsys interface

src/mesa/drivers/x11/xm_softpipe.c

@@ -0,0 +1,198 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * 
+ **************************************************************************/
+
+/*
+ * Authors:
+ *   Keith Whitwell
+ *   Brian Paul
+ */
+
+
+#include "glxheader.h"
+#include "xmesaP.h"
+#include "main/macros.h"
+
+#include "pipe/softpipe/sp_winsys.h"
+
+
+struct xm_softpipe_winsys
+{
+   struct softpipe_winsys sws;
+   XMesaContext xmctx; /* not really needed */
+};
+
+
+struct xm_buffer
+{
+   int refcount;
+   void *data;
+   void *mapped;
+};
+
+
+
+/* Turn the softpipe opaque buffer pointer into a dri_bufmgr opaque
+ * buffer pointer...
+ */
+static inline struct xm_buffer *
+xm_bo( struct pipe_buffer_handle *bo )
+{
+   return (struct xm_buffer *)bo;
+}
+
+static inline struct pipe_buffer_handle *
+pipe_bo( struct xm_buffer *bo )
+{
+   return (struct pipe_buffer_handle *)bo;
+}
+
+/* Turn a softpipe winsys into an xm/softpipe winsys:
+ */
+static inline struct xm_softpipe_winsys *
+xm_softpipe_winsys( struct softpipe_winsys *sws )
+{
+   return (struct xm_softpipe_winsys *)sws;
+}
+
+
+/* Most callbacks map direcly onto dri_bufmgr operations:
+ */
+static void *xm_buffer_map(struct softpipe_winsys *sws, 
+                           struct pipe_buffer_handle *buf )
+{
+   struct xm_buffer *xm_buf = xm_bo(buf);
+   xm_buf->mapped = xm_buf->data;
+   return xm_buf->mapped;
+}
+
+static void xm_buffer_unmap(struct softpipe_winsys *sws, 
+			       struct pipe_buffer_handle *buf)
+{
+   struct xm_buffer *xm_buf = xm_bo(buf);
+   xm_buf->mapped = NULL;
+}
+
+
+static struct pipe_buffer_handle *
+xm_buffer_reference(struct softpipe_winsys *sws,
+                    struct pipe_buffer_handle *buf)
+{
+   struct xm_buffer *xm_buf = xm_bo(buf);
+   xm_buf->refcount++;
+   return buf;
+}
+
+static void xm_buffer_unreference(struct softpipe_winsys *sws, 
+                                  struct pipe_buffer_handle **buf)
+{
+   struct xm_buffer *xm_buf = xm_bo(*buf);
+   xm_buf->refcount--;
+   if (xm_buf->refcount == 0) {
+      if (xm_buf->data) {
+         free(xm_buf->data);
+         xm_buf->data = NULL;
+      }
+      free(xm_buf);
+   }
+   *buf = NULL;
+}
+
+
+static void xm_buffer_data(struct softpipe_winsys *sws, 
+			      struct pipe_buffer_handle *buf,
+			      unsigned size, const void *data )
+{
+   struct xm_buffer *xm_buf = xm_bo(buf);
+   assert(!xm_buf->data);
+   xm_buf->data = malloc(size);
+}
+
+static void xm_buffer_subdata(struct softpipe_winsys *sws, 
+                              struct pipe_buffer_handle *buf,
+                              unsigned long offset, 
+                              unsigned long size, 
+                              const void *data)
+{
+   struct xm_buffer *xm_buf = xm_bo(buf);
+   GLubyte *b = (GLubyte *) xm_buf->data;
+   assert(b);
+   memcpy(b + offset, data, size);
+}
+
+static void xm_buffer_get_subdata(struct softpipe_winsys *sws, 
+				     struct pipe_buffer_handle *buf,
+				     unsigned long offset, 
+				     unsigned long size, 
+				     void *data)
+{
+   const struct xm_buffer *xm_buf = xm_bo(buf);
+   const GLubyte *b = (GLubyte *) xm_buf->data;
+   assert(b);
+   memcpy(data, b + offset, size);
+}
+
+
+/* Softpipe has no concept of pools.  We choose the tex/region pool
+ * for all buffers.
+ */
+static struct pipe_buffer_handle *
+xm_create_buffer(struct softpipe_winsys *sws, 
+                 unsigned alignment)
+{
+   struct xm_buffer *buffer;
+
+   buffer = CALLOC_STRUCT(xm_buffer);
+   return pipe_bo(buffer);
+}
+
+
+struct pipe_context *
+xmesa_create_softpipe(XMesaContext xmesa)
+{
+   struct xm_softpipe_winsys *isws = CALLOC_STRUCT( xm_softpipe_winsys );
+   
+   /* Fill in this struct with callbacks that softpipe will need to
+    * communicate with the window system, buffer manager, etc. 
+    *
+    * Softpipe would be happy with a malloc based memory manager, but
+    * the SwapBuffers implementation in this winsys driver requires
+    * that rendering be done to an appropriate xm_buffer.  
+    */
+   isws->sws.create_buffer = xm_create_buffer;
+   isws->sws.buffer_map = xm_buffer_map;
+   isws->sws.buffer_unmap = xm_buffer_unmap;
+   isws->sws.buffer_reference = xm_buffer_reference;
+   isws->sws.buffer_unreference = xm_buffer_unreference;
+   isws->sws.buffer_data = xm_buffer_data;
+   isws->sws.buffer_subdata = xm_buffer_subdata;
+   isws->sws.buffer_get_subdata = xm_buffer_get_subdata;
+
+   /* Create the softpipe context:
+    */
+   return softpipe_create( &isws->sws );
+}