code for compiling cl Code

This commit is contained in:
Mario Hüttel 2018-04-23 12:56:24 +02:00
parent 016cd00613
commit 9bfe5e0b30
3 changed files with 86 additions and 9 deletions

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@ -10,6 +10,7 @@ message(STATUS "OpenCL CXX includes: ${OPENCL_HAS_CPP_BINDINGS}")
message(STATUS "OpenCL libraries: ${OPENCL_LIBRARIES}")
add_executable(${PROJECT_NAME} "main.c")
configure_file("saxpy.cl" "cl_kernels/saxpy.cl" COPYONLY)
target_link_libraries(${PROJECT_NAME} ${OPENCL_LIBRARIES})
include_directories(${PROJECT_NAME} ${OPENCL_INCLUDE_DIR})

77
main.c
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@ -2,8 +2,50 @@
#include <CL/cl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
int main()
void check_error(cl_int error)
{
if (error != CL_SUCCESS) {
printf("OpenCL call failed with error %d\n", (int)error);
exit(error);
}
}
void load_kernel_from_file(char *file, char **src)
{
long fsize;
FILE *f = fopen(file, "rb");
fseek(f, 0, SEEK_END);
fsize = ftell(f);
fseek(f, 0, SEEK_SET); //same as rewind(f);
*src = (char *)malloc(fsize + 1);
fread(*src, fsize, 1, f);
fclose(f);
(*src)[fsize] = 0;
}
cl_program create_program(char *src, cl_context context)
{
cl_program program;
size_t lengths[1];
cl_int error = 0;
lengths[0] = strlen(src);
printf("strlen: %u\n", (unsigned int)lengths[0]);
program = clCreateProgramWithSource(context, 1, (const char **)&src,
lengths, &error);
check_error(error);
return program;
}
float test_a[] = {21.321, 213.213, 3213.23};
float test_b[] = {21.21, 13.213, 17.2553};
int main(void)
{
cl_int error;
@ -13,6 +55,10 @@ int main()
cl_uint device_id_count = 0;
cl_context_properties context_properties[4];
cl_context context;
cl_program program;
cl_kernel kernel;
cl_mem a_buff, b_buff;
char *source_code = NULL;
clGetPlatformIDs(0, NULL, &platform_id_count);
if (platform_id_count == 0)
@ -30,12 +76,14 @@ int main()
clGetDeviceIDs(platform_ids[0], CL_DEVICE_TYPE_ALL, 0, NULL,
&device_id_count);
printf("Device in Platform 0 count: %u\n", (unsigned int)device_id_count);
printf("Device in Platform 0 count: %u\n",
(unsigned int)device_id_count);
if (device_id_count == 0)
return -1;
device_ids = (cl_device_id*) malloc(sizeof(cl_device_id)*device_id_count);
device_ids = (cl_device_id *) malloc(sizeof(cl_device_id)
*device_id_count);
clGetDeviceIDs(platform_ids[0], CL_DEVICE_TYPE_ALL, device_id_count,
device_ids, NULL);
@ -48,6 +96,29 @@ int main()
context = clCreateContext(context_properties, device_id_count,
device_ids, NULL,
NULL, &error);
check_error(error);
load_kernel_from_file("cl_kernels/saxpy.cl", &source_code);
program = create_program(source_code, context);
/* Compile the source code */
check_error(clBuildProgram(program, device_id_count,
device_ids, NULL, NULL, NULL));
kernel = clCreateKernel(program, "SAXPY", &error);
/* Create memory buffers for data */
a_buff = clCreateBuffer(context, CL_MEM_READ_ONLY |
CL_MEM_COPY_HOST_PTR,
sizeof(test_a), test_a, &error);
check_error(error);
b_buff = clCreateBuffer(context, CL_MEM_READ_WRITE |
CL_MEM_COPY_HOST_PTR,
sizeof(test_b), test_b, &error);
check_error(error);
return 0;
}

5
saxpy.cl Normal file
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@ -0,0 +1,5 @@
__kernel void SAXPY (__global float* x, __global float* y, float a)
{
const int i = get_global_id (0);
y [i] += a * x [i];
}