void test02 ( void )
/******************************************************************************/
/*
Purpose:
TEST02 tests PPMA_READ.
Licensing:
This code is distributed under the GNU LGPL license.
Modified:
27 May 2011
Author:
John Burkardt
*/
{
int *b;
int error;
char *file_in_name = "test02.ascii.ppm";
int *g;
int i;
int j;
int k;
int *r;
int rgb_max;
int xsize;
int ysize;
printf ( "\n" );
printf ( "TEST02\n" );
printf ( " PPMA_READ reads the header and data of a PPMA file.\n" );
printf ( "\n" );
printf ( " Reading the file \"%s\".\n", file_in_name );
/*
Create a data file to read.
*/
error = ppma_write_test ( file_in_name );
if ( error == 1 )
{
printf ( "\n" );
printf ( "TEST02\n" );
printf ( " PPMA_WRITE_TEST failed!\n" );
return;
}
printf ( "\n" );
printf ( " PPMA_WRITE_TEST created some test data.\n" );
/*
Now have PPMA_READ try to read it.
*/
ppma_read ( file_in_name, &xsize, &ysize, &rgb_max, &r, &g, &b );
printf ( "\n" );
printf ( " PPMA_READ read the test data successfully.\n" );
printf ( "\n" );
printf ( " Ten sample values:\n" );
printf ( "\n" );
for ( k = 0; k < 10; k++ )
{
i = ( ( 9 - k ) * 0 + k * ( xsize - 1 ) ) / 9;
j = ( ( 9 - k ) * 0 + k * ( ysize - 1 ) ) / 9;
printf ( " %i4 %i4 %i6 %i6 %i6\n", i, j, r[i*ysize+j], g[i*ysize+j], g[i*ysize+j] );
}
free ( r );
free ( g );
free ( b );
return;
}
int main(int argc, char *argv[])
{
int error, xsize, ysize, rgb_max;
int *r, *b, *g;
float *gray, *congray, *congray_cl;
// identity kernel
// float filter[] = {
// 0,0,0,0,0,0,0,
// 0,0,0,0,0,0,0,
// 0,0,0,0,0,0,0,
// 0,0,0,1,0,0,0,
// 0,0,0,0,0,0,0,
// 0,0,0,0,0,0,0,
// 0,0,0,0,0,0,0,
// };
// 45 degree motion blur
float filter[] =
{0, 0, 0, 0, 0, 0.0145, 0,
0, 0, 0, 0, 0.0376, 0.1283, 0.0145,
0, 0, 0, 0.0376, 0.1283, 0.0376, 0,
0, 0, 0.0376, 0.1283, 0.0376, 0, 0,
0, 0.0376, 0.1283, 0.0376, 0, 0, 0,
0.0145, 0.1283, 0.0376, 0, 0, 0, 0,
0, 0.0145, 0, 0, 0, 0, 0};
// mexican hat kernel
// float filter[] = {
// 0, 0,-1,-1,-1, 0, 0,
// 0,-1,-3,-3,-3,-1, 0,
// -1,-3, 0, 7, 0,-3,-1,
// -1,-3, 7,24, 7,-3,-1,
// -1,-3, 0, 7, 0,-3,-1,
// 0,-1,-3,-3,-3,-1, 0,
// 0, 0,-1,-1,-1, 0, 0
// };
if(argc != 3)
{
fprintf(stderr, "Usage: %s image.ppm num_loops\n", argv[0]);
abort();
}
const char* filename = argv[1];
const int num_loops = atoi(argv[2]);
// --------------------------------------------------------------------------
// load image
// --------------------------------------------------------------------------
printf("Reading ``%s''\n", filename);
ppma_read(filename, &xsize, &ysize, &rgb_max, &r, &g, &b);
printf("Done reading ``%s'' of size %dx%d\n", filename, xsize, ysize);
// --------------------------------------------------------------------------
// allocate CPU buffers
// --------------------------------------------------------------------------
posix_memalign((void**)&gray, 32, xsize*ysize*sizeof(float));
if(!gray) { fprintf(stderr, "alloc gray"); abort(); }
posix_memalign((void**)&congray, 32, xsize*ysize*sizeof(float));
if(!congray) { fprintf(stderr, "alloc gray"); abort(); }
posix_memalign((void**)&congray_cl, 32, xsize*ysize*sizeof(float));
if(!congray_cl) { fprintf(stderr, "alloc gray"); abort(); }
// --------------------------------------------------------------------------
// convert image to grayscale
// --------------------------------------------------------------------------
for(int n = 0; n < xsize*ysize; ++n)
gray[n] = (0.21f*r[n])/rgb_max + (0.72f*g[n])/rgb_max + (0.07f*b[n])/rgb_max;
// --------------------------------------------------------------------------
// execute filter on cpu
// --------------------------------------------------------------------------
for(int i = HALF_FILTER_WIDTH; i < ysize - HALF_FILTER_WIDTH; ++i)
{
for(int j = HALF_FILTER_WIDTH; j < xsize - HALF_FILTER_WIDTH; ++j)
{
float sum = 0;
for(int k = -HALF_FILTER_WIDTH; k <= HALF_FILTER_WIDTH; ++k)
{
for(int l = -HALF_FILTER_WIDTH; l <= HALF_FILTER_WIDTH; ++l)
{
sum += gray[(i+k)*xsize + (j+l)] *
filter[(k+HALF_FILTER_WIDTH)*FILTER_WIDTH + (l+HALF_FILTER_WIDTH)];
}
}
congray[i*xsize + j] = sum;
}
}
// --------------------------------------------------------------------------
// output cpu filtered image
// --------------------------------------------------------------------------
printf("Writing cpu filtered image\n");
for(int n = 0; n < xsize*ysize; ++n)
r[n] = g[n] = b[n] = (int)(congray[n] * rgb_max);
error = ppma_write("output_cpu.ppm", xsize, ysize, r, g, b);
if(error) { fprintf(stderr, "error writing image"); abort(); }
// --------------------------------------------------------------------------
// get an OpenCL context and queue
// --------------------------------------------------------------------------
cl_context ctx;
cl_command_queue queue;
create_context_on(CHOOSE_INTERACTIVELY, CHOOSE_INTERACTIVELY, 0, &ctx, &queue, 0);
print_device_info_from_queue(queue);
// --------------------------------------------------------------------------
// load kernels
// --------------------------------------------------------------------------
char *knl_text = read_file("convolution.cl");
cl_kernel knl = kernel_from_string(ctx, knl_text, "convolution", NULL);
free(knl_text);
#ifdef NON_OPTIMIZED
int deviceWidth = xsize;
#else
int deviceWidth = ((xsize + WGX - 1)/WGX)* WGX;
#endif
int deviceHeight = ysize;
size_t deviceDataSize = deviceHeight*deviceWidth*sizeof(float);
// --------------------------------------------------------------------------
// allocate device memory
// --------------------------------------------------------------------------
cl_int status;
cl_mem buf_gray = clCreateBuffer(ctx, CL_MEM_READ_ONLY,
deviceDataSize, 0, &status);
CHECK_CL_ERROR(status, "clCreateBuffer");
cl_mem buf_congray = clCreateBuffer(ctx, CL_MEM_WRITE_ONLY,
deviceDataSize, 0, &status);
CHECK_CL_ERROR(status, "clCreateBuffer");
cl_mem buf_filter = clCreateBuffer(ctx, CL_MEM_READ_ONLY,
FILTER_WIDTH*FILTER_WIDTH*sizeof(float), 0, &status);
CHECK_CL_ERROR(status, "clCreateBuffer");
// --------------------------------------------------------------------------
// transfer to device
// --------------------------------------------------------------------------
#ifdef NON_OPTIMIZED
CALL_CL_SAFE(clEnqueueWriteBuffer(
queue, buf_gray, /*blocking*/ CL_TRUE, /*offset*/ 0,
deviceDataSize, gray, 0, NULL, NULL));
#else
size_t buffer_origin[3] = {0,0,0};
size_t host_origin[3] = {0,0,0};
size_t region[3] = {deviceWidth*sizeof(float), ysize, 1};
clEnqueueWriteBufferRect(queue, buf_gray, CL_TRUE,
buffer_origin, host_origin, region,
deviceWidth*sizeof(float), 0, xsize*sizeof(float), 0,
gray, 0, NULL, NULL);
#endif
CALL_CL_SAFE(clEnqueueWriteBuffer(
queue, buf_filter, /*blocking*/ CL_TRUE, /*offset*/ 0,
FILTER_WIDTH*FILTER_WIDTH*sizeof(float), filter, 0, NULL, NULL));
// --------------------------------------------------------------------------
// run code on device
// --------------------------------------------------------------------------
cl_int rows = ysize;
cl_int cols = xsize;
cl_int filterWidth = FILTER_WIDTH;
cl_int paddingPixels = 2*HALF_FILTER_WIDTH;
size_t local_size[] = { WGX, WGY };
size_t global_size[] = {
((xsize-paddingPixels + local_size[0] - 1)/local_size[0])* local_size[0],
((ysize-paddingPixels + local_size[1] - 1)/local_size[1])* local_size[1],
};
cl_int localWidth = local_size[0] + paddingPixels;
cl_int localHeight = local_size[1] + paddingPixels;
size_t localMemSize = localWidth * localHeight * sizeof(float);
CALL_CL_SAFE(clSetKernelArg(knl, 0, sizeof(buf_gray), &buf_gray));
CALL_CL_SAFE(clSetKernelArg(knl, 1, sizeof(buf_congray), &buf_congray));
CALL_CL_SAFE(clSetKernelArg(knl, 2, sizeof(buf_filter), &buf_filter));
CALL_CL_SAFE(clSetKernelArg(knl, 3, sizeof(rows), &rows));
CALL_CL_SAFE(clSetKernelArg(knl, 4, sizeof(cols), &cols));
CALL_CL_SAFE(clSetKernelArg(knl, 5, sizeof(filterWidth), &filterWidth));
CALL_CL_SAFE(clSetKernelArg(knl, 6, localMemSize, NULL));
CALL_CL_SAFE(clSetKernelArg(knl, 7, sizeof(localHeight), &localHeight));
CALL_CL_SAFE(clSetKernelArg(knl, 8, sizeof(localWidth), &localWidth));
// --------------------------------------------------------------------------
// print kernel info
// --------------------------------------------------------------------------
print_kernel_info(queue, knl);
CALL_CL_SAFE(clFinish(queue));
timestamp_type tic, toc;
get_timestamp(&tic);
for(int loop = 0; loop < num_loops; ++loop)
{
CALL_CL_SAFE(clEnqueueNDRangeKernel(queue, knl, 2, NULL,
global_size, local_size, 0, NULL, NULL));
// Edit: Copy the blurred image to input buffer
#ifdef NON_OPTIMIZED
CALL_CL_SAFE(clEnqueueCopyBuffer(queue, buf_congray, buf_gray, 0, 0,
deviceDataSize, 0, NULL, NULL));
#else
clEnqueueCopyBufferRect(queue, buf_congray, buf_gray,
buffer_origin, host_origin, region,
deviceWidth*sizeof(float), 0,
xsize*sizeof(float), 0,
0, NULL, NULL);
#endif
}
CALL_CL_SAFE(clFinish(queue));
get_timestamp(&toc);
double elapsed = timestamp_diff_in_seconds(tic,toc)/num_loops;
printf("%f s\n", elapsed);
printf("%f MPixels/s\n", xsize*ysize/1e6/elapsed);
printf("%f GBit/s\n", 2*xsize*ysize*sizeof(float)/1e9/elapsed);
printf("%f GFlop/s\n", (xsize-HALF_FILTER_WIDTH)*(ysize-HALF_FILTER_WIDTH)
*FILTER_WIDTH*FILTER_WIDTH/1e9/elapsed);
// --------------------------------------------------------------------------
// transfer back & check
// --------------------------------------------------------------------------
#ifdef NON_OPTIMIZED
CALL_CL_SAFE(clEnqueueReadBuffer(
queue, buf_congray, /*blocking*/ CL_TRUE, /*offset*/ 0,
xsize * ysize * sizeof(float), congray_cl,
0, NULL, NULL));
#else
buffer_origin[0] = 3*sizeof(float);
buffer_origin[1] = 3;
buffer_origin[2] = 0;
host_origin[0] = 3*sizeof(float);
host_origin[1] = 3;
host_origin[2] = 0;
region[0] = (xsize-paddingPixels)*sizeof(float);
region[1] = (ysize-paddingPixels);
region[2] = 1;
clEnqueueReadBufferRect(queue, buf_congray, CL_TRUE,
buffer_origin, host_origin, region,
deviceWidth*sizeof(float), 0, xsize*sizeof(float), 0,
congray_cl, 0, NULL, NULL);
#endif
// --------------------------------------------------------------------------
// output OpenCL filtered image
// --------------------------------------------------------------------------
printf("Writing OpenCL filtered image\n");
// Edit: Keep pixel value in the interval [0, 255] to reduce boundary effect
for(int n = 0; n < xsize*ysize; ++n) {
int color = (int)(congray_cl[n] * rgb_max);
if (color < 0) {
color = 0;
} else if (color > 255) {
color = 255;
}
r[n] = g[n] = b[n] = color;
}
error = ppma_write("output_cl.ppm", xsize, ysize, r, g, b);
if(error) { fprintf(stderr, "error writing image"); abort(); }
// --------------------------------------------------------------------------
// clean up
// --------------------------------------------------------------------------
CALL_CL_SAFE(clReleaseMemObject(buf_congray));
CALL_CL_SAFE(clReleaseMemObject(buf_gray));
CALL_CL_SAFE(clReleaseMemObject(buf_filter));
CALL_CL_SAFE(clReleaseKernel(knl));
CALL_CL_SAFE(clReleaseCommandQueue(queue));
CALL_CL_SAFE(clReleaseContext(ctx));
free(gray);
free(congray);
free(congray_cl);
free(r);
free(b);
free(g);
}
