/* * Copyright 2018 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ // This is a simple OpenCL Hello World that tests you have a functioning OpenCL setup. #include "cl.hpp" #include #include #include #include #include static inline void assert_cl(cl_int rc, const char* file, int line) { if (rc != CL_SUCCESS) { fprintf(stderr, "%s:%d, got OpenCL error code %d\n", file,line,rc); exit(1); } } #define cl_ok(err) assert_cl(err, __FILE__, __LINE__) int main(int, char**) { std::vector platforms; cl_ok(cl::Platform::get(&platforms)); std::vector devices; for (cl::Platform platform : platforms) { std::vector platform_devices; cl_ok(platform.getDevices(CL_DEVICE_TYPE_ALL, &platform_devices)); devices.insert(devices.end(), platform_devices.begin(), platform_devices.end()); } if (devices.empty()) { fprintf(stderr, "No OpenCL devices available. :(\n"); return 1; } // To keep things simple we'll only create single-device cl::Contexts. for (cl::Device device : devices) { std::string name, version, driver, vendor, extensions; cl_ok(device.getInfo(CL_DEVICE_NAME, &name)); cl_ok(device.getInfo(CL_DEVICE_VERSION, &version)); cl_ok(device.getInfo(CL_DEVICE_VENDOR, &vendor)); cl_ok(device.getInfo(CL_DEVICE_EXTENSIONS, &extensions)); cl_ok(device.getInfo(CL_DRIVER_VERSION, &driver)); fprintf(stdout, "Using %s%s, vendor %s, version %s, extensions:\n%s\n", version.c_str(), name.c_str(), vendor.c_str(), driver.c_str(), extensions.c_str()); std::vector devices = { device }; // Some APIs can't return their cl_int error but might still fail, // so they take a pointer. cl_ok() is really handy here too. cl_int ok; cl::Context ctx(devices, nullptr/*optional cl_context_properties*/, nullptr/*optional error reporting callback*/, nullptr/*context argument for error reporting callback*/, &ok); cl_ok(ok); cl::Program program(ctx, "__kernel void mul(__global const float* a, " " __global const float* b, " " __global float* dst) {" " int i = get_global_id(0); " " dst[i] = a[i] * b[i]; " "} ", /*and build now*/true, &ok); cl_ok(ok); std::vector a,b,p; for (int i = 0; i < 1000; i++) { a.push_back(+i); b.push_back(-i); p.push_back( 0); } cl::Buffer A(ctx, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR , sizeof(float)*a.size(), a.data()), B(ctx, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR , sizeof(float)*b.size(), b.data()), P(ctx, CL_MEM_WRITE_ONLY| CL_MEM_HOST_READ_ONLY, sizeof(float)*p.size()); cl::Kernel mul(program, "mul", &ok); cl_ok(ok); cl_ok(mul.setArg(0, A)); cl_ok(mul.setArg(1, B)); cl_ok(mul.setArg(2, P)); cl::CommandQueue queue(ctx, device); cl_ok(queue.enqueueNDRangeKernel(mul, cl::NDRange(0) /*offset*/ , cl::NDRange(1000) /*size*/)); cl_ok(queue.enqueueReadBuffer(P, true/*block until read is done*/ , 0 /*offset in bytes*/ , sizeof(float)*p.size() /*size in bytes*/ , p.data())); fprintf(stdout, "OpenCL sez: %g x %g = %g\n", a[42], b[42], p[42]); for (int i = 0; i < 1000; i++) { if (p[i] != a[i]*b[i]) { return 1; } } } return 0; }