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SSE2: switch from Gaussian to box blur

master
Sebastian Frysztak 8 years ago
parent
4b58824e5e
commit
ab41586b39
1 changed files with 14 additions and 28 deletions
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  1. 42
      blur_simd.c

42
blur_simd.c
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@ -90,44 +90,30 @@ void blur_impl_horizontal_pass_sse2(uint32_t *src, uint32_t *dst, float *kernel,
rgbaIn[k] = _mm_loadu_si128((__m128i*)(src + 4*k - HALF_KERNEL));
}
// unpack each pixel, convert to float,
// multiply by corresponding kernel value
// and add to accumulator
__m128i tmp;
__m128i zero = _mm_setzero_si128();
__m128 rgba_ps;
__m128 acc = _mm_setzero_ps();
int counter = 0;
__m128i acc = _mm_setzero_si128();
for (int i = 0; i < 3; i++)
{
tmp = _mm_unpacklo_epi8(rgbaIn[i], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
tmp = _mm_unpackhi_epi8(rgbaIn[i], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[i], zero));
acc = _mm_add_epi16(acc, _mm_unpackhi_epi8(rgbaIn[i], zero));
}
tmp = _mm_unpacklo_epi8(rgbaIn[3], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[3], zero));
tmp = _mm_unpackhi_epi8(rgbaIn[3], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
// set 16th pixel to zeroes
tmp = _mm_andnot_si128(_mm_set_epi16(0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0,0,0,0), tmp);
acc = _mm_add_epi16(acc, tmp);
acc = _mm_add_epi32(_mm_unpacklo_epi16(acc, zero), _mm_unpackhi_epi16(acc, zero));
__m128i rgbaOut = _mm_cvtps_epi32(acc);
rgbaOut = _mm_packs_epi32(rgbaOut, zero);
rgbaOut = _mm_packus_epi16(rgbaOut, zero);
*(dst + height * column + row) = _mm_cvtsi128_si32(rgbaOut);
acc = _mm_cvtps_epi32(_mm_mul_ps(_mm_cvtepi32_ps(acc),
_mm_set1_ps(1/((float)(KERNEL_SIZE)))));
acc = _mm_packs_epi32(acc, zero);
acc = _mm_packus_epi16(acc, zero);
*(dst + height * column + row) = _mm_cvtsi128_si32(acc);
}
}
}

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