parallel processing - OpenCL Kernel Error -11 -
i'm new opencl , i'm trying parallelise edge detection program.i'm trying write kernel edge detection function. original function:
void edgedetection(float *out, float *in, int w, int h) { int r,c; (r = 0; r < h-2; r++) { (c = 0; c < w-2; c++) { float g; float* pout = &out[r*w + c]; float gx = 0.0; float gy = 0.0; int fr,fc; /* run 2d-convolution filter */ (fr = 0; fr < 3; fr++) { (fc = 0; fc < 3; fc++) { float p = in[(r+fr)*w + (c+fc)]; /* x-directional edges */ gx += p * f[fr*3 + fc]; /* y-directional edges */ gy += p * f[fc*3 + fr]; } } /* edges, pythagoral sum */ g = sqrtf(gx*gx + gy*gy); *pout = g; } } } my opencl kernel:
__kernel void edgedetection(__global float *out, __global float *in, int w, int h) { // work-item’s unique id const int r = get_global_id(0); const int c = get_global_id(1); if(r>=0 && c>=0 && r<h-2 && c<w-2){ float g; float* pout = &out[r*w + c]; float gx = 0.0; float gy = 0.0; int fr,fc; (fr = 0; fr < 3; fr++) { (fc = 0; fc < 3; fc++) { float p = in[(r+fr)*w + (c+fc)]; gx += p * f[fr*3 + fc]; gy += p * f[fc*3 + fr]; } } g = sqrtf(gx*gx + gy*gy); *pout = g; } } when try build program .cl file using this(chk function check if there failures/errors):
status = clbuildprogram(program, 1, &device, null, null, null); chk(status, "clbuildprogram"); i error saying, "clbuildprogram failed (-11)". researches, i've seen commonly tought error caused syntax error. however, after checking many times cannot see particularly wrong kernel. can me figure out what's wrong it?
there many errors in code:
1)
float* pout = &out[r*w + c]; this invalid, should be:
__global float* pout = &out[r*w + c]; 2) using f in kernel never defined.
3) sqrtf not defined in cl, did mean sqrt instead?
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