}
}
-// non local memory version
-__kernel
- void calcMap_2
- (
- __global const int * dx,
- __global const int * dy,
- __global const float * mag,
- __global int * map,
- int rows,
- int cols,
- float low_thresh,
- float high_thresh,
- int dx_step,
- int dx_offset,
- int dy_step,
- int dy_offset,
- int mag_step,
- int mag_offset,
- int map_step,
- int map_offset
- )
-{
- dx_step /= sizeof(*dx);
- dx_offset /= sizeof(*dx);
- dy_step /= sizeof(*dy);
- dy_offset /= sizeof(*dy);
- mag_step /= sizeof(*mag);
- mag_offset /= sizeof(*mag);
- map_step /= sizeof(*map);
- map_offset /= sizeof(*map);
-
-
- int gidx = get_global_id(0);
- int gidy = get_global_id(1);
-
- if(gidy < rows && gidx < cols)
- {
- int x = dx[gidx + gidy * dx_step];
- int y = dy[gidx + gidy * dy_step];
- const int s = (x ^ y) < 0 ? -1 : 1;
- const float m = mag[gidx + 1 + (gidy + 1) * mag_step];
- x = abs(x);
- y = abs(y);
-
- // 0 - the pixel can not belong to an edge
- // 1 - the pixel might belong to an edge
- // 2 - the pixel does belong to an edge
- int edge_type = 0;
- if(m > low_thresh)
- {
- const int tg22x = x * TG22;
- const int tg67x = tg22x + (x << (1 + CANNY_SHIFT));
- y <<= CANNY_SHIFT;
- if(y < tg22x)
- {
- if(m > mag[gidx + (gidy + 1) * mag_step] && m >= mag[gidx + 2 + (gidy + 1) * mag_step])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- else if (y > tg67x)
- {
- if(m > mag[gidx + 1 + gidy* mag_step] && m >= mag[gidx + 1 + (gidy + 2) * mag_step])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- else
- {
- if(m > mag[gidx + 1 - s + gidy * mag_step] && m > mag[gidx + 1 + s + (gidy + 2) * mag_step])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- }
- map[gidx + 1 + (gidy + 1) * map_step] = edge_type;
- }
-}
-
-// [256, 1, 1] threaded, local memory version
-__kernel
- void calcMap_3
- (
- __global const int * dx,
- __global const int * dy,
- __global const float * mag,
- __global int * map,
- int rows,
- int cols,
- float low_thresh,
- float high_thresh,
- int dx_step,
- int dx_offset,
- int dy_step,
- int dy_offset,
- int mag_step,
- int mag_offset,
- int map_step,
- int map_offset
- )
-{
- dx_step /= sizeof(*dx);
- dx_offset /= sizeof(*dx);
- dy_step /= sizeof(*dy);
- dy_offset /= sizeof(*dy);
- mag_step /= sizeof(*mag);
- mag_offset /= sizeof(*mag);
- map_step /= sizeof(*map);
- map_offset /= sizeof(*map);
-
- __local float smem[18][18];
-
- int lidx = get_local_id(0) % 16;
- int lidy = get_local_id(0) / 16;
-
- int grp_pix = get_global_id(0); // identifies which pixel is processing currently in the target block
- int grp_ind = get_global_id(1); // identifies which block of pixels is currently processing
-
- int grp_idx = (grp_ind % (cols/16)) * 16;
- int grp_idy = (grp_ind / (cols/16)) * 16; //(grp_ind / (cols/16)) * 16
-
- int gidx = grp_idx + lidx;
- int gidy = grp_idy + lidy;
-
- int tid = get_global_id(0) % 256;
- int lx = tid % 18;
- int ly = tid / 18;
- if(ly < 14)
- {
- smem[ly][lx] = mag[grp_idx + lx + (grp_idy + ly) * mag_step];
- }
- if(ly < 4 && grp_idy + ly + 14 <= rows && grp_idx + lx <= cols)
- {
- smem[ly + 14][lx] = mag[grp_idx + lx + (grp_idy + ly + 14) * mag_step];
- }
-
- barrier(CLK_LOCAL_MEM_FENCE);
-
- if(gidy < rows && gidx < cols)
- {
- int x = dx[gidx + gidy * dx_step];
- int y = dy[gidx + gidy * dy_step];
- const int s = (x ^ y) < 0 ? -1 : 1;
- const float m = smem[lidy + 1][lidx + 1];
- x = abs(x);
- y = abs(y);
-
- // 0 - the pixel can not belong to an edge
- // 1 - the pixel might belong to an edge
- // 2 - the pixel does belong to an edge
- int edge_type = 0;
- if(m > low_thresh)
- {
- const int tg22x = x * TG22;
- const int tg67x = tg22x + (x << (1 + CANNY_SHIFT));
- y <<= CANNY_SHIFT;
- if(y < tg22x)
- {
- if(m > smem[lidy + 1][lidx] && m >= smem[lidy + 1][lidx + 2])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- else if (y > tg67x)
- {
- if(m > smem[lidy][lidx + 1]&& m >= smem[lidy + 2][lidx + 1])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- else
- {
- if(m > smem[lidy][lidx + 1 - s]&& m > smem[lidy + 2][lidx + 1 + s])
- {
- edge_type = 1 + (int)(m > high_thresh);
- }
- }
- }
- map[gidx + 1 + (gidy + 1) * map_step] = edge_type;
- }
-}
-
#undef CANNY_SHIFT
#undef TG22