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#define LAPLACE_RADIUS 2
#define EPSILON 1e-5f
void minmax(float x1, float x2, float x3,
float x4, float x5,
float *min_result,
float *max_result)
{
float min1, min2, max1, max2;
if (x1 > x2)
{
max1 = x1;
min1 = x2;
}
else
{
max1 = x2;
min1 = x1;
}
if (x3 > x4)
{
max2 = x3;
min2 = x4;
}
else
{
max2 = x4;
min2 = x3;
}
if (min1 < min2)
*min_result = fmin(min1, x5);
else
*min_result = fmin(min2, x5);
if (max1 > max2)
*max_result = fmax(max1, x5);
else
*max_result = fmax(max2, x5);
}
kernel void pre_edgelaplace (global float4 *in,
global float4 *out)
{
int gidx = get_global_id(0);
int gidy = get_global_id(1);
int src_width = get_global_size(0) + LAPLACE_RADIUS * 2;
int src_height = get_global_size(1);
int i = gidx + LAPLACE_RADIUS, j = gidy + LAPLACE_RADIUS;
int gid1d = i + j * src_width;
float pix_fl[4] = {
in[gid1d - 1 - src_width].x, in[gid1d - 1 - src_width].y,
in[gid1d - 1 - src_width].z, in[gid1d - 1 - src_width].w
};
float pix_fm[4] = {
in[gid1d - src_width].x, in[gid1d - src_width].y,
in[gid1d - src_width].z, in[gid1d - src_width].w
};
float pix_fr[4] = {
in[gid1d + 1 - src_width].x, in[gid1d + 1 - src_width].y,
in[gid1d + 1 - src_width].z, in[gid1d + 1 - src_width].w
};
float pix_ml[4] = {
in[gid1d - 1 ].x, in[gid1d - 1 ].y,
in[gid1d - 1 ].z, in[gid1d - 1 ].w
};
float pix_mm[4] = {
in[gid1d ].x, in[gid1d ].y,
in[gid1d ].z, in[gid1d ].w
};
float pix_mr[4] = {
in[gid1d + 1 ].x, in[gid1d + 1 ].y,
in[gid1d + 1 ].z, in[gid1d + 1 ].w
};
float pix_bl[4] = {
in[gid1d - 1 + src_width].x, in[gid1d - 1 + src_width].y,
in[gid1d - 1 + src_width].z, in[gid1d - 1 + src_width].w
};
float pix_bm[4] = {
in[gid1d + src_width].x, in[gid1d + src_width].y,
in[gid1d + src_width].z, in[gid1d + src_width].w
};
float pix_br[4] = {
in[gid1d + 1 + src_width].x, in[gid1d + 1 + src_width].y,
in[gid1d + 1 + src_width].z, in[gid1d + 1 + src_width].w
};
int c;
float minval, maxval;
float gradient[4];
for (c = 0;c < 3; ++c)
{
minmax(pix_fm[c], pix_bm[c], pix_ml[c], pix_mr[c],
pix_mm[c], &minval, &maxval);
gradient[c] = 0.5f *
fmax((maxval - pix_mm[c]),(pix_mm[c] - minval));
gradient[c] =
(pix_fl[c] + pix_fm[c] + pix_fr[c] +
pix_bm[c] - 8.0f * pix_mm[c] + pix_br[c] +
pix_ml[c] + pix_mr[c] + pix_bl[c]) <
EPSILON ? -1.0f * gradient[c] : gradient[c];
}
gradient[3] = pix_mm[3];
out[gid1d] = (float4)
(gradient[0], gradient[1], gradient[2], gradient[3]);
}
kernel void knl_edgelaplace (global float4 *in,
global float4 *out)
{
int gidx = get_global_id(0);
int gidy = get_global_id(1);
int src_width = get_global_size(0) + LAPLACE_RADIUS * 2;
int src_height = get_global_size(1);
int i = gidx + LAPLACE_RADIUS, j = gidy + LAPLACE_RADIUS;
int gid1d = i + j * src_width;
float pix_fl[4] = {
in[gid1d - 1 - src_width].x, in[gid1d - 1 - src_width].y,
in[gid1d - 1 - src_width].z, in[gid1d - 1 - src_width].w
};
float pix_fm[4] = {
in[gid1d - src_width].x, in[gid1d - src_width].y,
in[gid1d - src_width].z, in[gid1d - src_width].w
};
float pix_fr[4] = {
in[gid1d + 1 - src_width].x, in[gid1d + 1 - src_width].y,
in[gid1d + 1 - src_width].z, in[gid1d + 1 - src_width].w
};
float pix_ml[4] = {
in[gid1d - 1 ].x, in[gid1d - 1 ].y,
in[gid1d - 1 ].z, in[gid1d - 1 ].w
};
float pix_mm[4] = {
in[gid1d ].x, in[gid1d ].y,
in[gid1d ].z, in[gid1d ].w
};
float pix_mr[4] = {
in[gid1d + 1 ].x, in[gid1d + 1 ].y,
in[gid1d + 1 ].z, in[gid1d + 1 ].w
};
float pix_bl[4] = {
in[gid1d - 1 + src_width].x, in[gid1d - 1 + src_width].y,
in[gid1d - 1 + src_width].z, in[gid1d - 1 + src_width].w
};
float pix_bm[4] = {
in[gid1d + src_width].x, in[gid1d + src_width].y,
in[gid1d + src_width].z, in[gid1d + src_width].w
};
float pix_br[4] = {
in[gid1d + 1 + src_width].x, in[gid1d + 1 + src_width].y,
in[gid1d + 1 + src_width].z, in[gid1d + 1 + src_width].w
};
int c;
float value[4];
for (c = 0;c < 3; ++c)
{
float current = pix_mm[c];
current =
((current > 0.0f) &&
(pix_fl[c] < 0.0f || pix_fm[c] < 0.0f ||
pix_fr[c] < 0.0f || pix_ml[c] < 0.0f ||
pix_mr[c] < 0.0f || pix_bl[c] < 0.0f ||
pix_bm[c] < 0.0f || pix_br[c] < 0.0f )
) ? current : 0.0f;
value[c] = current;
}
value[3] = pix_mm[3];
out[gidx + gidy * get_global_size(0)] = (float4)
(value[0], value[1], value[2], value[3]);
}
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