gallium,clover: add OpenCL interoperability support for CL events

v2: - move interop.cpp to clover/api
    - change intptr_t to void* in the interface
    - add a virtual function fence() to simplify some code

v3: - use bool in the interface
v4: - enclose the last two interop functions in try..catch

Reviewed-by: Francisco Jerez <currojerez@riseup.net>

src/gallium/include/state_tracker/opencl_interop.h

@@ -0,0 +1,40 @@
+/**************************************************************************
+ *
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ * 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 THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ **************************************************************************/
+
+#ifndef OPENCL_INTEROP_H
+#define OPENCL_INTEROP_H
+
+/* dlsym these without the "_t" suffix. You should get the correct symbols
+ * if the OpenCL driver is loaded.
+ */
+
+typedef bool (*opencl_dri_event_add_ref_t)(void *cl_event);
+typedef bool (*opencl_dri_event_release_t)(void *cl_event);
+typedef bool (*opencl_dri_event_wait_t)(void *cl_event, uint64_t timeout);
+typedef struct pipe_fence_handle *(*opencl_dri_event_get_fence_t)(void *cl_event);
+
+#endif /* OPENCL_INTEROP_H */

src/gallium/state_trackers/clover/Makefile.sources

@@ -4,6 +4,7 @@ CPP_SOURCES := \
 	api/dispatch.cpp \
 	api/dispatch.hpp \
 	api/event.cpp \
+	api/interop.cpp \
 	api/kernel.cpp \
 	api/memory.cpp \
 	api/platform.cpp \

src/gallium/state_trackers/clover/api/interop.cpp

@@ -0,0 +1,64 @@
+//
+// Copyright 2015 Advanced Micro Devices, Inc.
+// 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 OR COPYRIGHT HOLDERS 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 "core/event.hpp"
+#include "api/util.hpp"
+
+using namespace clover;
+
+extern "C" {
+
+PUBLIC bool
+opencl_dri_event_add_ref(cl_event event)
+{
+   return clRetainEvent(event) == CL_SUCCESS;
+}
+
+PUBLIC bool
+opencl_dri_event_release(cl_event event)
+{
+   return clReleaseEvent(event) == CL_SUCCESS;
+}
+
+PUBLIC bool
+opencl_dri_event_wait(cl_event event, uint64_t timeout) try {
+   if (!timeout) {
+      return obj(event).status() == CL_COMPLETE;
+   }
+
+   obj(event).wait();
+   return true;
+
+} catch (error &) {
+   return false;
+}
+
+PUBLIC struct pipe_fence_handle *
+opencl_dri_event_get_fence(cl_event event) try {
+   return obj(event).fence();
+
+} catch (error &) {
+   return NULL;
+}
+
+}

src/gallium/state_trackers/clover/core/event.hpp

@@ -70,6 +70,10 @@ namespace clover {
       virtual cl_command_type command() const = 0;
       virtual void wait() const = 0;
 
+      virtual struct pipe_fence_handle *fence() const {
+         return NULL;
+      }
+
       const intrusive_ref<clover::context> context;
 
    protected:
@@ -116,6 +120,10 @@ namespace clover {
 
       friend class command_queue;
 
+      virtual struct pipe_fence_handle *fence() const {
+         return _fence;
+      }
+
    private:
       virtual void fence(pipe_fence_handle *fence);
       action profile(command_queue &q, const action &action) const;

src/gallium/targets/opencl/opencl.sym

@@ -1,6 +1,7 @@
 {
 	global:
 		cl*;
+		opencl_dri_*;
 	local:
 		*;
 };