45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
int twoToOne(x, y, width, height) {
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while(x < 0) {
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x += width;
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}
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while(y < 0) {
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y += height;
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}
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x = x % width;
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y = y % height;
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return x + y * width;
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}
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//float gaussian(float x, float y) {
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// return exp(-(x*x + y*y) / (1.5F * 1.5F * 2.0F));
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//}
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__kernel void do_filter(
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__global float *filter_out, __global const float *precomputed,
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__global const int *pbp, const int width, const int height,
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const int filter_size) {
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int i = get_global_id(0);
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if(i < 0 || i >= width * height) {
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return;
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}
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int x = i % width;
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int y = i / width;
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float sum = 0.0F;
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for(int q = 0; q < filter_size; ++q) {
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int q_prime = height - filter_size / 2 + y + q;
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for(int p = 0; p < filter_size; ++p) {
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int p_prime = width - filter_size / 2 + x + p;
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if(pbp[twoToOne(p_prime, q_prime, width, height)] != 0) {
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sum += precomputed[twoToOne(p, q, filter_size, filter_size)];
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//sum += gaussian(p - filter_size / 2.0F + 0.5F, q - filter_size / 2.0F + 0.5F);
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}
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}
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}
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filter_out[i] = sum;
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}
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// vim: syntax=c
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