targets/osmesa: new OSMesa gallium target

Reviewed-by: José Fonseca <jfonseca@vmware.com>

src/gallium/targets/osmesa/target.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2013  Brian Paul   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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS 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.
+ */
+
+
+#include "target-helpers/inline_sw_helper.h"
+#include "target-helpers/inline_debug_helper.h"
+
+#include "sw/null/null_sw_winsys.h"
+
+
+struct pipe_screen *
+osmesa_create_screen(void);
+
+
+struct pipe_screen *
+osmesa_create_screen(void)
+{
+   struct sw_winsys *winsys;
+   struct pipe_screen *screen;
+
+   /* We use a null software winsys since we always just render to ordinary
+    * driver resources.
+    */
+   winsys = null_sw_create();
+   if (!winsys)
+      return NULL;
+
+   /* Create llvmpipe or softpipe screen */
+   screen = sw_screen_create(winsys);
+   if (!screen) {
+      winsys->destroy(winsys);
+      return NULL;
+   }
+
+   /* Inject optional trace, debug, etc. wrappers */
+   return debug_screen_wrap(screen);
+}