kc3-lang/angle/src/libGLESv2/renderer/loadimageSSE2.cpp

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• Hash : 86846e24
  Author :
  Date : 2014-06-03T15:48:54
  

  Clean up the functions in loadimage.h/cpp.
  
  * Capitalize the function names to fit the style guide.
  * Use explicit sizes in the function names to avoid any confusion about
    input or output sizes.
  * Use explicit sized types in the functions to avoid potential issues on
    new platforms since a lot of bit-twiddling is used.
  * Use size_t for all sizes.
  * Use uint8_t for all binary data for input and output data so that pointer
    arithmetic is much easier.
  * Move templated function definitions into an .inl file so that
    loadimage.h looks as clean as possible.
  
  BUG=angle:665
  
  Change-Id: Id7173ed66d9e1b7ee3261eea11e77d838cbd2951
  Reviewed-on: https://chromium-review.googlesource.com/202590
  Reviewed-by: Brandon Jones <bajones@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libGLESv2/renderer/loadimageSSE2.cpp

• #include "precompiled.h"
  //
  // Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // loadimageSSE2.cpp: Defines image loading functions. It's
  // in a separated file for GCC, which can enable SSE usage only per-file,
  // not for code blocks that use SSE2 explicitly.
  
  #include "libGLESv2/renderer/loadimage.h"
  
  namespace rx
  {
  
  void LoadA8ToBGRA8_SSE2(size_t width, size_t height, size_t depth,
                          const uint8_t *input, size_t inputRowPitch, size_t inputDepthPitch,
                          uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      __m128i zeroWide = _mm_setzero_si128();
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const uint8_t *source = OffsetDataPointer<uint8_t>(input, y, z, inputRowPitch, inputDepthPitch);
              uint32_t *dest = OffsetDataPointer<uint32_t>(output, y, z, outputRowPitch, outputDepthPitch);
  
              size_t x = 0;
  
              // Make output writes aligned
              for (; ((reinterpret_cast<intptr_t>(&dest[x]) & 0xF) != 0 && x < width); x++)
              {
                  dest[x] = static_cast<uint32_t>(source[x]) << 24;
              }
  
              for (; x + 7 < width; x += 8)
              {
                  __m128i sourceData = _mm_loadl_epi64(reinterpret_cast<const __m128i*>(&source[x]));
                  // Interleave each byte to 16bit, make the lower byte to zero
                  sourceData = _mm_unpacklo_epi8(zeroWide, sourceData);
                  // Interleave each 16bit to 32bit, make the lower 16bit to zero
                  __m128i lo = _mm_unpacklo_epi16(zeroWide, sourceData);
                  __m128i hi = _mm_unpackhi_epi16(zeroWide, sourceData);
  
                  _mm_store_si128(reinterpret_cast<__m128i*>(&dest[x]), lo);
                  _mm_store_si128(reinterpret_cast<__m128i*>(&dest[x + 4]), hi);
              }
  
              // Handle the remainder
              for (; x < width; x++)
              {
                  dest[x] = static_cast<uint32_t>(source[x]) << 24;
              }
          }
      }
  }
  
  void LoadRGBA8ToBGRA8_SSE2(size_t width, size_t height, size_t depth,
                             const uint8_t *input, size_t inputRowPitch, size_t inputDepthPitch,
                             uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      __m128i brMask = _mm_set1_epi32(0x00ff00ff);
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const uint32_t *source = OffsetDataPointer<uint32_t>(input, y, z, inputRowPitch, inputDepthPitch);
              uint32_t *dest = OffsetDataPointer<uint32_t>(output, y, z, outputRowPitch, outputDepthPitch);
  
              size_t x = 0;
  
              // Make output writes aligned
              for (; ((reinterpret_cast<intptr_t>(&dest[x]) & 15) != 0) && x < width; x++)
              {
                  uint32_t rgba = source[x];
                  dest[x] = (_rotl(rgba, 16) & 0x00ff00ff) | (rgba & 0xff00ff00);
              }
  
              for (; x + 3 < width; x += 4)
              {
                  __m128i sourceData = _mm_loadu_si128(reinterpret_cast<const __m128i*>(&source[x]));
                  // Mask out g and a, which don't change
                  __m128i gaComponents = _mm_andnot_si128(brMask, sourceData);
                  // Mask out b and r
                  __m128i brComponents = _mm_and_si128(sourceData, brMask);
                  // Swap b and r
                  __m128i brSwapped = _mm_shufflehi_epi16(_mm_shufflelo_epi16(brComponents, _MM_SHUFFLE(2, 3, 0, 1)), _MM_SHUFFLE(2, 3, 0, 1));
                  __m128i result = _mm_or_si128(gaComponents, brSwapped);
                  _mm_store_si128(reinterpret_cast<__m128i*>(&dest[x]), result);
              }
  
              // Perform leftover writes
              for (; x < width; x++)
              {
                  uint32_t rgba = source[x];
                  dest[x] = (_rotl(rgba, 16) & 0x00ff00ff) | (rgba & 0xff00ff00);
              }
          }
      }
  }
  
  }
  

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