Enumerate OpenCL platforms available

cltest.cpp

#include <iostream>
#include <CL/cl.h>

const cl_uint PlatformEntriesLen = 16;
const size_t PlatformProfileLen = 256;

int main(int argc, char *argv[])
{
    // Enumerate all of the platforms
    
    cl_platform_id platforms[PlatformEntriesLen];
    cl_uint num_platforms = 0;
    
    if (clGetPlatformIDs(PlatformEntriesLen,
                        platforms,
                        &num_platforms)
            != CL_SUCCESS) {
        std::cerr << "[ERROR] Unable to enumerate platforms." << std::endl;
        return 1;
    }
    
    // List all of the platforms
    
    std::cout << "Platforms:" << std::endl;
    for (cl_uint i = 0; i < num_platforms; ++i) {
        
        char platformProfile[PlatformProfileLen];
        size_t platformProfileRet = 0;
        
        if (clGetPlatformInfo(platforms[i],
                             CL_PLATFORM_NAME,
                             PlatformProfileLen,
                             platformProfile,
                             &platformProfileRet)
                != CL_SUCCESS) {
            std::cerr << "[ERROR] Unable to obtain platform info";
            return 1;
        }
        
        std::cout << "  " << i << ". ";
        std::cout.write(platformProfile, platformProfileRet);
        std::cout << std::endl;
    }
    
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.11)
project(cltest)

find_package(OpenCL REQUIRED)

add_executable(cltest cltest.cpp)

include_directories(cltest ${OpenCL_INCLUDE_DIRS})
target_link_libraries(cltest ${OpenCL_LIBRARIES})