From 016cd00613682afbe849e70fa41e37c306d44a54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Mon, 23 Apr 2018 09:09:14 +0200
Subject: [PATCH] fix #1

---
 CMakeLists.txt |  2 +-
 main.c         | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
 main.cpp       | 43 ----------------------------------------
 3 files changed, 54 insertions(+), 44 deletions(-)
 create mode 100644 main.c
 delete mode 100644 main.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c2032e..7b80ecc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@ message(STATUS "OpenCL includes: ${OPENCL_INCLUDE_DIRS}")
 message(STATUS "OpenCL CXX includes: ${OPENCL_HAS_CPP_BINDINGS}")
 message(STATUS "OpenCL libraries: ${OPENCL_LIBRARIES}")
 
-add_executable(${PROJECT_NAME} "main.cpp")
+add_executable(${PROJECT_NAME} "main.c")
 
 target_link_libraries(${PROJECT_NAME} ${OPENCL_LIBRARIES})
 include_directories(${PROJECT_NAME} ${OPENCL_INCLUDE_DIR})
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..f02d7b7
--- /dev/null
+++ b/main.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <CL/cl.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main()
+{
+
+	cl_int error;
+	cl_platform_id *platform_ids = NULL;
+	cl_device_id *device_ids = NULL;
+	cl_uint platform_id_count = 0;
+	cl_uint device_id_count = 0;
+	cl_context_properties context_properties[4];
+	cl_context context;
+
+	clGetPlatformIDs (0, NULL, &platform_id_count);
+	if (platform_id_count == 0)
+		return -1;
+
+	platform_ids = (cl_platform_id*) malloc(platform_id_count *
+						sizeof(cl_platform_id));
+	if (platform_ids == NULL)
+		return -1;
+
+	clGetPlatformIDs (platform_id_count, platform_ids, NULL);
+
+	printf("Platforms available: %u\n", (unsigned int)platform_id_count);
+
+
+	clGetDeviceIDs (platform_ids[0], CL_DEVICE_TYPE_ALL, 0, NULL,
+			&device_id_count);
+	printf("Device in Platform 0 count: %u\n", (unsigned int)device_id_count);
+
+	if (device_id_count == 0)
+		return -1;
+
+	device_ids = (cl_device_id*) malloc(sizeof(cl_device_id)*device_id_count);
+
+	clGetDeviceIDs (platform_ids[0], CL_DEVICE_TYPE_ALL, device_id_count,
+			device_ids, NULL);
+
+	context_properties[0] = CL_CONTEXT_PLATFORM;
+	context_properties[1] = (cl_context_properties)platform_ids[0];
+	context_properties[2] = context_properties[3] = 0;
+
+
+	context = clCreateContext (context_properties, device_id_count,
+				   device_ids, NULL,
+				   NULL, &error);
+
+	return 0;
+}
diff --git a/main.cpp b/main.cpp
deleted file mode 100644
index c8a12f3..0000000
--- a/main.cpp
+++ /dev/null
@@ -1,43 +0,0 @@
-#include <iostream>
-#include <vector>
-#include <CL/cl.h>
-
-int main()
-{
-
-
-	cl_int error;
-
-	cl_uint platformIdCount = 0;
-	clGetPlatformIDs (0, nullptr, &platformIdCount);
-
-	std::vector<cl_platform_id> platformIds (platformIdCount);
-	clGetPlatformIDs (platformIdCount, platformIds.data(), nullptr);
-
-	std::cout << "Platform count: " << platformIdCount << std::endl;
-
-	cl_uint deviceIdCount = 0;
-	clGetDeviceIDs (platformIds [0], CL_DEVICE_TYPE_ALL, 0, nullptr,
-	    &deviceIdCount);
-	std::cout << "Device in Platform 0 count: " << deviceIdCount << std::endl;
-
-	std::vector<cl_device_id> deviceIds (deviceIdCount);
-	clGetDeviceIDs (platformIds [0], CL_DEVICE_TYPE_ALL, deviceIdCount,
-	    deviceIds.data (), nullptr);
-
-
-	const cl_context_properties contextProperties [] =
-	{
-	    CL_CONTEXT_PLATFORM,
-	    reinterpret_cast<cl_context_properties> (platformIds [0]),
-	    0, 0
-	};
-
-	cl_context context = clCreateContext (
-	    contextProperties, deviceIdCount,
-	    deviceIds.data (), nullptr,
-	    nullptr, &error);
-
-
-	return 0;
-}