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Extend supported environment variables set to select default device #5

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Extend supported environment variables set to select default device #5

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c306c95
BOOST_COMPUTE_DEFAULT_DEVICE accepts substrings of device name
ddemidov Mar 26, 2013
160089e
Adds support for selecting devices with environment variables
ddemidov Apr 12, 2013
2cbdd74
Make system::device_platform and system::matches private
ddemidov Apr 12, 2013
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8 changes: 4 additions & 4 deletions example/hello_world.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,12 @@

int main()
{
// get the default GPU device
boost::compute::device gpu =
boost::compute::system::default_gpu_device();
// get the default device
boost::compute::device device =
boost::compute::system::default_device();

// print the GPU's name
std::cout << "hello from " << gpu.name() << std::endl;
std::cout << "hello from " << device.name() << std::endl;

return 0;
}
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30 changes: 25 additions & 5 deletions include/boost/compute/system.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,21 @@ class system
static device default_device()
{
// check for device from environment variable
const char *name = std::getenv("BOOST_COMPUTE_DEFAULT_DEVICE");
if(name){
device device = find_device(name);
if(device.id()){
const char *name = std::getenv("BOOST_COMPUTE_DEFAULT_DEVICE");
const char *platform = std::getenv("BOOST_COMPUTE_DEFAULT_PLATFORM");
const char *vendor = std::getenv("BOOST_COMPUTE_DEFAULT_VENDOR");

if(name || platform || vendor){
BOOST_FOREACH(const device &device, devices()){
if (name && !matches(device.name(), name))
continue;

if (platform && !matches(device_platform(device).name(), platform))
continue;

if (vendor && !matches(device.vendor(), vendor))
continue;

return device;
}
}
Expand Down Expand Up @@ -80,7 +91,7 @@ class system
static device find_device(const std::string &name)
{
BOOST_FOREACH(const device &device, devices()){
if(device.name() == name){
if(device.name().find(name) != std::string::npos){
return device;
}
}
Expand Down Expand Up @@ -141,6 +152,15 @@ class system
clGetPlatformIDs(0, 0, &count);
return static_cast<size_t>(count);
}

private:
static platform device_platform(const device &device) {
return platform( device.get_info<cl_platform_id>(CL_DEVICE_PLATFORM) );
}

static bool matches(const std::string &str, const std::string &pattern) {
return str.find(pattern) != std::string::npos;
}
};

} // end compute namespace
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