可以在iOS上使用OpenCL [英] Is available OpenCL on iOS

问题描述

我在论坛上发现了这个帖子是IPad还是IPhone能够使用OpenCL？但是它已经很老了。另外，我可以收集的是，OpenCL可用于iOS的系统库，但不适用于公共。是否有更多信息或更新？

I found this thread on the forum Are either the IPad or IPhone capable of OpenCL? but is it quite old. Also, what I can gather that OpenCL is available to system libraries of iOS but not to public. Is there more info in this regard or any update ?

推荐答案

即使使用 OpenCL 作为私有框架，iOS上的它不会给你带来GPU （或其他像DSP / FPGA，如果存在的话）的好处。它只是为您提供臂处理器上的多个内核。我运行以下代码来验证iOS和OS X中可访问的OpenCL设备。

Even with using OpenCL as private framework, on iOS it won't give you the benefits of GPU ( or others like DSPs/FPGAs if existing ). It just gives you multiple cores available on arm processor. I ran the below code to verify the OpenCL devices accessible in iOS and OS X.

iOS上的输出

ARM CPU设备

ARM CPU Device

OS X上的输出

Radeon HD 4670

英特尔（R）酷睿（TM）i3 CPU 540 @ 3.07GHz

Radeon HD 4670
Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

排除错误检查的来源。使用OpenCL标头（ 1 ）并链接OpenCL（/ Applications / Xcode） .app / Contents / Developer / Platforms / iPhoneOS.platform / Developer / SDKs / iPhoneOS8.1.sdk / System / Library / PrivateFrameworks）

Source with error checks excluded. Using OpenCL headers available(1) and linking OpenCL from (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.1.sdk/System/Library/PrivateFrameworks)

#include "OpenCL/cl.h"
#include <iostream>

cl_context_properties prop[] = { CL_CONTEXT_PLATFORM, 0, 0 };    
//get num of platforms
cl_uint num;
cl_int err = clGetPlatformIDs(0, 0, &num);


//get each platform
cl_platform_id *platforms = new cl_platform_id[num];
err = clGetPlatformIDs(num, platforms, &num);

//create context for platform
prop[1] = (cl_context_properties) platforms[0];
cl_context context = clCreateContextFromType(prop, CL_DEVICE_TYPE_ALL, NULL, NULL, &err);


//get num devices
size_t numDevices=0;
clGetContextInfo(context, CL_CONTEXT_DEVICES, 0, NULL, &numDevices);
cl_device_id *devices = new cl_device_id[ numDevices ];

//get every device
clGetContextInfo(context, CL_CONTEXT_DEVICES, numDevices, devices, 0);

//get info of every device
for( int idx=0; idx < numDevices; ++idx) {

    size_t bufSize=0;
    clGetDeviceInfo(devices[idx], CL_DEVICE_NAME, 0, NULL, &bufSize);
    if( bufSize > 0 ) {
        char* devName = new char[ bufSize ];
        clGetDeviceInfo(devices[idx], CL_DEVICE_NAME, bufSize, devName, 0);
        std::cout << "Device Name: " << devName << '\n';
    }
}

建议：截至目前，我们需要使用OpenGL（ 2 ）或加速框架（ 3 ）。仍然不确定，出于什么原因/目的将OpenCL作为私有框架复制到iPhone上。

Suggestion: As of now, we will need to use either OpenGL(2) or Accelerate framework(3). Still not sure, for what reason/purpose OpenCL is copied in as private framework on iPhone.

这篇关于可以在iOS上使用OpenCL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！