From d3cd6d290846a79539fbc18e10ca69ad6ab55bd9 Mon Sep 17 00:00:00 2001
From: clemahieu <clemahieu@gmail.com>
Date: Tue, 5 Apr 2016 21:46:19 -0500
Subject: [PATCH] Dynamically binding to posix opencl library.

---
 CMakeLists.txt                 |  4 +++
 rai/plat/posix/openclapi.cpp   | 47 ++++++++++++++++++++++++++++++++++
 rai/plat/windows/openclapi.cpp |  0
 3 files changed, 51 insertions(+)
 create mode 100644 rai/plat/posix/openclapi.cpp
 create mode 100644 rai/plat/windows/openclapi.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b40476e..9d6f1496 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -101,12 +101,15 @@ if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 	set (PLATFORM_WALLET_SOURCE rai/plat/default/icon.cpp)
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
 	set (PLATFORM_SECURE_SOURCE rai/plat/windows/working.cpp rai/plat/windows/priority.cpp)
+	set (PLATFORM_NODE_SOURCE rai/plat/windows/openclapi.cpp)
 	set (PLATFORM_WALLET_SOURCE rai/plat/windows/icon.cpp RaiBlocks.rc)
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 	set (PLATFORM_SECURE_SOURCE rai/plat/posix/working.cpp rai/plat/linux/priority.cpp)
+	set (PLATFORM_NODE_SOURCE rai/plat/posix/openclapi.cpp)
 	set (PLATFORM_WALLET_SOURCE rai/plat/default/icon.cpp)
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
 	set (PLATFORM_SECURE_SOURCE rai/plat/posix/working.cpp rai/plat/default/priority.cpp)
+	set (PLATFORM_NODE_SOURCE rai/plat/posix/openclapi.cpp)
 	set (PLATFORM_WALLET_SOURCE rai/plat/default/icon.cpp)
 else ()
 	error ("Unknown platform: ${CMAKE_SYSTEM_NAME}")
@@ -123,6 +126,7 @@ add_library (secure
 	rai/versioning.cpp)
 
 add_library (node
+	${PLATFORM_NODE_SOURCE}
 	rai/node/bootstrap.cpp
 	rai/node/bootstrap.hpp
 	rai/node/common.cpp
diff --git a/rai/plat/posix/openclapi.cpp b/rai/plat/posix/openclapi.cpp
new file mode 100644
index 00000000..3cf841b2
--- /dev/null
+++ b/rai/plat/posix/openclapi.cpp
@@ -0,0 +1,47 @@
+#include <rai/node/openclwork.hpp>
+
+#include <dlfcn.h>
+
+namespace
+{
+class opencl_initializer
+{
+public:
+	opencl_initializer ()
+	{
+		opencl_library = dlopen ("libOpenCL.so", RTLD_NOW);
+		if (opencl_library != nullptr)
+		{
+			clGetPlatformIDs = reinterpret_cast <decltype (clGetPlatformIDs)> (dlsym (opencl_library, "clGetPlatformIDs"));
+		}
+	}
+	~opencl_initializer ()
+	{
+		dlclose (opencl_library);
+	}
+	void * opencl_library;
+	cl_int (* clGetPlatformIDs) (cl_uint, cl_platform_id *, cl_uint *);
+	cl_int (* clGetDeviceIDs) (cl_platform_id, cl_device_type, cl_uint, cl_device_id *, cl_uint *);
+	static opencl_initializer initializer;
+};
+}
+
+cl_int clGetPlatformIDs (cl_uint num_entries, cl_platform_id * platforms, cl_uint * num_platforms)
+{
+	cl_int result;
+	if (opencl_initializer::initializer.opencl_library != nullptr)
+	{
+		result = opencl_initializer::initializer.clGetPlatformIDs (num_entries, platforms, num_platforms);
+	}
+	else
+	{
+		result = CL_SUCCESS;
+		*num_platforms = 0;
+	}
+	return result;
+}
+
+cl_int clGetDeviceIDs (cl_platform_id platform, cl_device_type device_type, cl_uint num_entries, cl_device_id * devices, cl_uint * num_devices)
+{
+	return clGetDeviceIDs (platform, device_type, num_entries, devices, num_devices);
+}
\ No newline at end of file
diff --git a/rai/plat/windows/openclapi.cpp b/rai/plat/windows/openclapi.cpp
new file mode 100644
index 00000000..e69de29b