640654d145
Change-Id: I6d18be3f6178003eb5153d32d4b618101ddcb3d9 Reviewed-on: https://skia-review.googlesource.com/c/191297 Auto-Submit: Mike Klein <mtklein@google.com> Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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// This is a simple OpenCL Hello World that tests you have a functioning OpenCL setup.
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#include "cl.hpp"
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#include <initializer_list>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string>
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#include <vector>
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static inline void assert_cl(cl_int rc, const char* file, int line) {
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if (rc != CL_SUCCESS) {
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fprintf(stderr, "%s:%d, got OpenCL error code %d\n", file,line,rc);
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exit(1);
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}
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}
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#define cl_ok(err) assert_cl(err, __FILE__, __LINE__)
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int main(int, char**) {
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std::vector<cl::Platform> platforms;
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cl_ok(cl::Platform::get(&platforms));
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std::vector<cl::Device> devices;
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for (cl::Platform platform : platforms) {
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std::vector<cl::Device> platform_devices;
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cl_ok(platform.getDevices(CL_DEVICE_TYPE_ALL, &platform_devices));
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devices.insert(devices.end(), platform_devices.begin(), platform_devices.end());
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}
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if (devices.empty()) {
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fprintf(stderr, "No OpenCL devices available. :(\n");
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return 1;
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}
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// To keep things simple we'll only create single-device cl::Contexts.
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for (cl::Device device : devices) {
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std::string name,
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version,
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driver,
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vendor,
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extensions;
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cl_ok(device.getInfo(CL_DEVICE_NAME, &name));
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cl_ok(device.getInfo(CL_DEVICE_VERSION, &version));
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cl_ok(device.getInfo(CL_DEVICE_VENDOR, &vendor));
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cl_ok(device.getInfo(CL_DEVICE_EXTENSIONS, &extensions));
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cl_ok(device.getInfo(CL_DRIVER_VERSION, &driver));
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fprintf(stdout, "Using %s%s, vendor %s, version %s, extensions:\n%s\n",
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version.c_str(), name.c_str(), vendor.c_str(), driver.c_str(), extensions.c_str());
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std::vector<cl::Device> devices = { device };
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// Some APIs can't return their cl_int error but might still fail,
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// so they take a pointer. cl_ok() is really handy here too.
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cl_int ok;
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cl::Context ctx(devices,
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nullptr/*optional cl_context_properties*/,
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nullptr/*optional error reporting callback*/,
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nullptr/*context argument for error reporting callback*/,
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&ok);
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cl_ok(ok);
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cl::Program program(ctx,
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"__kernel void mul(__global const float* a, "
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" __global const float* b, "
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" __global float* dst) {"
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" int i = get_global_id(0); "
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" dst[i] = a[i] * b[i]; "
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"} ",
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/*and build now*/true,
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&ok);
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cl_ok(ok);
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std::vector<float> a,b,p;
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for (int i = 0; i < 1000; i++) {
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a.push_back(+i);
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b.push_back(-i);
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p.push_back( 0);
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}
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cl::Buffer
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A(ctx, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR , sizeof(float)*a.size(), a.data()),
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B(ctx, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR , sizeof(float)*b.size(), b.data()),
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P(ctx, CL_MEM_WRITE_ONLY| CL_MEM_HOST_READ_ONLY, sizeof(float)*p.size());
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cl::Kernel mul(program, "mul", &ok);
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cl_ok(ok);
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cl_ok(mul.setArg(0, A));
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cl_ok(mul.setArg(1, B));
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cl_ok(mul.setArg(2, P));
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cl::CommandQueue queue(ctx, device);
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cl_ok(queue.enqueueNDRangeKernel(mul, cl::NDRange(0) /*offset*/
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, cl::NDRange(1000) /*size*/));
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cl_ok(queue.enqueueReadBuffer(P, true/*block until read is done*/
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, 0 /*offset in bytes*/
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, sizeof(float)*p.size() /*size in bytes*/
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, p.data()));
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fprintf(stdout, "OpenCL sez: %g x %g = %g\n", a[42], b[42], p[42]);
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for (int i = 0; i < 1000; i++) {
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if (p[i] != a[i]*b[i]) {
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return 1;
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}
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}
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}
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return 0;
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}
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