gallium/noop: no operation gallium driver

This driver is a fake swdri driver that perform no operations
beside allocation gallium structure and buffer for upper layer
usage.

It's purpose is to help profiling core mesa/gallium without
having pipe driver overhead hidding hot spot of core code.

scons file are likely inadequate i am unfamiliar with this
build system.

To use it simply rename is to swrast_dri.so and properly set
LIBGL_DRIVERS_PATH env variable.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/src/gallium/targets/dri-noop/swrast_drm_api.c b/src/gallium/targets/dri-noop/swrast_drm_api.c
new file mode 100644
index 0000000000..a99779f183
--- /dev/null
+++ b/src/gallium/targets/dri-noop/swrast_drm_api.c
@@ -0,0 +1,63 @@
+/**************************************************************************
+ *
+ * Copyright 2009, VMware, Inc.
+ * All Rights Reserved.
+ * Copyright 2010 George Sapountzis <gsapountzis@gmail.com>
+ *
+ * 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 VMWARE 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.
+ *
+ **************************************************************************/
+
+#include "pipe/p_compiler.h"
+#include "util/u_memory.h"
+#include "dri_sw_winsys.h"
+#include "noop/noop_public.h"
+
+#include "target-helpers/inline_debug_helper.h"
+#include "target-helpers/inline_sw_helper.h"
+
+
+struct pipe_screen *
+drisw_create_screen(struct drisw_loader_funcs *lf)
+{
+   struct sw_winsys *winsys = NULL;
+   struct pipe_screen *screen = NULL;
+
+   winsys = dri_create_sw_winsys(lf);
+   if (winsys == NULL)
+      return NULL;
+
+   screen = noop_screen_create(winsys);
+   if (!screen)
+      goto fail;
+
+   screen = debug_screen_wrap(screen);
+
+   return screen;
+
+fail:
+   if (winsys)
+      winsys->destroy(winsys);
+
+   return NULL;
+}
+
+/* vim: set sw=3 ts=8 sts=3 expandtab: */