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-//
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-// File: hello.c
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-//
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-// Abstract: A simple "Hello World" compute example showing basic usage of OpenCL which
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-// calculates the mathematical square (X[i] = pow(X[i],2)) for a buffer of
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-// floating point values.
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-//
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-//
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-// Version: <1.0>
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-//
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-// Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc. ("Apple")
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-// in consideration of your agreement to the following terms, and your use,
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-// installation, modification or redistribution of this Apple software
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-// constitutes acceptance of these terms. If you do not agree with these
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-// terms, please do not use, install, modify or redistribute this Apple
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-// software.
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-//
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-// In consideration of your agreement to abide by the following terms, and
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-// subject to these terms, Apple grants you a personal, non - exclusive
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-// license, under Apple's copyrights in this original Apple software ( the
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-// "Apple Software" ), to use, reproduce, modify and redistribute the Apple
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-// Software, with or without modifications, in source and / or binary forms;
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-// provided that if you redistribute the Apple Software in its entirety and
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-// without modifications, you must retain this notice and the following text
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-// and disclaimers in all such redistributions of the Apple Software. Neither
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-// the name, trademarks, service marks or logos of Apple Inc. may be used to
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-// endorse or promote products derived from the Apple Software without specific
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-// prior written permission from Apple. Except as expressly stated in this
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-// notice, no other rights or licenses, express or implied, are granted by
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-// Apple herein, including but not limited to any patent rights that may be
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-// infringed by your derivative works or by other works in which the Apple
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-// Software may be incorporated.
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-//
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-// The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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-// WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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-// WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
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-// PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION
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-// ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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-//
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-// IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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-// CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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-// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-// INTERRUPTION ) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION
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-// AND / OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
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-// UNDER THEORY OF CONTRACT, TORT ( INCLUDING NEGLIGENCE ), STRICT LIABILITY OR
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-// OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-//
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-// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.
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-//
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-
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-////////////////////////////////////////////////////////////////////////////////
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-
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-#include <fcntl.h>
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-#include <stdio.h>
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-#include <stdlib.h>
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-#include <string.h>
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-#include <math.h>
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-#include <unistd.h>
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-#include <sys/types.h>
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-#include <sys/stat.h>
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-#include <CL/cl.h>
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-
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-////////////////////////////////////////////////////////////////////////////////
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-
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-// Use a static data size for simplicity
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-//
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-#define DATA_SIZE (1024)
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-
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-////////////////////////////////////////////////////////////////////////////////
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-
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-// Simple compute kernel which computes the square of an input array
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-//
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-const char *KernelSource = "\n" \
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-"__kernel void square( \n" \
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-" __global float* input, \n" \
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-" __global float* output, \n" \
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-" const unsigned int count) \n" \
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-"{ \n" \
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-" int i = get_global_id(0); \n" \
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-" if(i < count) \n" \
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-" output[i] = input[i] * input[i]; \n" \
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-"} \n" \
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-"\n";
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-
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-////////////////////////////////////////////////////////////////////////////////
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-
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-int main(int argc, char** argv)
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-{
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- int err; // error code returned from api calls
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-
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- float data[DATA_SIZE]; // original data set given to device
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- float results[DATA_SIZE]; // results returned from device
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- unsigned int correct; // number of correct results returned
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-
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- size_t global; // global domain size for our calculation
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- size_t local; // local domain size for our calculation
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-
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- cl_device_id device_id; // compute device id
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- cl_context context; // compute context
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- cl_command_queue commands; // compute command queue
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- cl_program program; // compute program
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- cl_kernel kernel; // compute kernel
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-
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- cl_mem input; // device memory used for the input array
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- cl_mem output; // device memory used for the output array
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-
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- // Fill our data set with random float values
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- //
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- int i = 0;
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- unsigned int count = DATA_SIZE;
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- for(i = 0; i < count; i++)
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- data[i] = rand() / (float)RAND_MAX;
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-
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- // Connect to a compute device
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- //
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- int gpu = 1;
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- err = clGetDeviceIDs(NULL, gpu ? CL_DEVICE_TYPE_GPU : CL_DEVICE_TYPE_CPU, 1, &device_id, NULL);
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- if (err != CL_SUCCESS)
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- {
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- printf("Error: Failed to create a device group!\n");
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- return EXIT_FAILURE;
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- }
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-
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- // Create a compute context
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- //
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- context = clCreateContext(0, 1, &device_id, NULL, NULL, &err);
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- if (!context)
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- {
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- printf("Error: Failed to create a compute context!\n");
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- return EXIT_FAILURE;
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- }
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-
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- // Create a command commands
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- //
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- commands = clCreateCommandQueue(context, device_id, 0, &err);
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- if (!commands)
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- {
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- printf("Error: Failed to create a command commands!\n");
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- return EXIT_FAILURE;
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- }
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-
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- // Create the compute program from the source buffer
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- //
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- program = clCreateProgramWithSource(context, 1, (const char **) & KernelSource, NULL, &err);
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- if (!program)
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- {
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- printf("Error: Failed to create compute program!\n");
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- return EXIT_FAILURE;
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- }
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-
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- // Build the program executable
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- //
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- err = clBuildProgram(program, 0, NULL, NULL, NULL, NULL);
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- if (err != CL_SUCCESS)
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- {
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- size_t len;
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- char buffer[2048];
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-
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- printf("Error: Failed to build program executable!\n");
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- clGetProgramBuildInfo(program, device_id, CL_PROGRAM_BUILD_LOG, sizeof(buffer), buffer, &len);
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- printf("%s\n", buffer);
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- exit(1);
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- }
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-
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- // Create the compute kernel in the program we wish to run
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- //
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- kernel = clCreateKernel(program, "square", &err);
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- if (!kernel || err != CL_SUCCESS)
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- {
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- printf("Error: Failed to create compute kernel!\n");
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- exit(1);
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- }
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-
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- // Create the input and output arrays in device memory for our calculation
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- //
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- input = clCreateBuffer(context, CL_MEM_READ_ONLY, sizeof(float) * count, NULL, NULL);
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- output = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float) * count, NULL, NULL);
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- if (!input || !output)
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- {
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- printf("Error: Failed to allocate device memory!\n");
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- exit(1);
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- }
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-
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- // Write our data set into the input array in device memory
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- //
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- err = clEnqueueWriteBuffer(commands, input, CL_TRUE, 0, sizeof(float) * count, data, 0, NULL, NULL);
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- if (err != CL_SUCCESS)
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- {
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- printf("Error: Failed to write to source array!\n");
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- exit(1);
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- }
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-
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- // Set the arguments to our compute kernel
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- //
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- err = 0;
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- err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &input);
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- err |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &output);
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- err |= clSetKernelArg(kernel, 2, sizeof(unsigned int), &count);
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- if (err != CL_SUCCESS)
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- {
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- printf("Error: Failed to set kernel arguments! %d\n", err);
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- exit(1);
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- }
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-
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- // Get the maximum work group size for executing the kernel on the device
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- //
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- err = clGetKernelWorkGroupInfo(kernel, device_id, CL_KERNEL_WORK_GROUP_SIZE, sizeof(local), &local, NULL);
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- if (err != CL_SUCCESS)
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- {
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- printf("Error: Failed to retrieve kernel work group info! %d\n", err);
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- exit(1);
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- }
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-
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- // Execute the kernel over the entire range of our 1d input data set
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- // using the maximum number of work group items for this device
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- //
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- global = count;
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- err = clEnqueueNDRangeKernel(commands, kernel, 1, NULL, &global, &local, 0, NULL, NULL);
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- if (err)
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- {
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- printf("Error: Failed to execute kernel!\n");
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- return EXIT_FAILURE;
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- }
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-
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- // Wait for the command commands to get serviced before reading back results
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- //
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- clFinish(commands);
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-
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- // Read back the results from the device to verify the output
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- //
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- err = clEnqueueReadBuffer( commands, output, CL_TRUE, 0, sizeof(float) * count, results, 0, NULL, NULL );
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- if (err != CL_SUCCESS)
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- {
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- printf("Error: Failed to read output array! %d\n", err);
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- exit(1);
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- }
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-
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- // Validate our results
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- //
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- correct = 0;
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- for(i = 0; i < count; i++)
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- {
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- if(results[i] == data[i] * data[i])
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- correct++;
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- }
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-
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- // Print a brief summary detailing the results
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- //
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- printf("Computed '%d/%d' correct values!\n", correct, count);
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-
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- // Shutdown and cleanup
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- //
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- clReleaseMemObject(input);
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- clReleaseMemObject(output);
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- clReleaseProgram(program);
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- clReleaseKernel(kernel);
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- clReleaseCommandQueue(commands);
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- clReleaseContext(context);
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-
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- return 0;
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-}
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