kc3-lang/angle/src/libANGLE/renderer/copyvertex.inc

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• Author : Yuly Novikov
  Date : 2018-10-16 17:30:48
  Hash : 25843dd6
  Message : Align memory access in Copy32FixedTo32FVertexData Bug: angleproject:2895 Change-Id: Idfe379e34c4f165b91babcb1990df28fa151d807 Reviewed-on: https://chromium-review.googlesource.com/c/1286373 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• src/libANGLE/renderer/copyvertex.inc

• //
  // Copyright (c) 2014-2015 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.
  //
  
  // copyvertex.inc: Implementation of vertex buffer copying and conversion functions
  
  namespace rx
  {
  
  template <typename T, size_t inputComponentCount, size_t outputComponentCount, uint32_t alphaDefaultValueBits>
  inline void CopyNativeVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      const size_t attribSize = sizeof(T)* inputComponentCount;
  
      if (attribSize == stride && inputComponentCount == outputComponentCount)
      {
          memcpy(output, input, count * attribSize);
          return;
      }
  
      if (inputComponentCount == outputComponentCount)
      {
          for (size_t i = 0; i < count; i++)
          {
              const T *offsetInput = reinterpret_cast<const T*>(input + (i * stride));
              T *offsetOutput = reinterpret_cast<T*>(output) + i * outputComponentCount;
  
              memcpy(offsetOutput, offsetInput, attribSize);
          }
          return;
      }
  
      const T defaultAlphaValue = gl::bitCast<T>(alphaDefaultValueBits);
      const size_t lastNonAlphaOutputComponent = std::min<size_t>(outputComponentCount, 3);
  
      for (size_t i = 0; i < count; i++)
      {
          const T *offsetInput = reinterpret_cast<const T*>(input + (i * stride));
          T *offsetOutput = reinterpret_cast<T*>(output) + i * outputComponentCount;
  
          memcpy(offsetOutput, offsetInput, attribSize);
  
          if (inputComponentCount < lastNonAlphaOutputComponent)
          {
              // Set the remaining G/B channels to 0.
              size_t numComponents = (lastNonAlphaOutputComponent - inputComponentCount);
              memset(&offsetOutput[inputComponentCount], 0, numComponents * sizeof(T));
          }
  
          if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
          {
              // Set the remaining alpha channel to the defaultAlphaValue.
              offsetOutput[3] = defaultAlphaValue;
          }
      }
  }
  
  template <size_t inputComponentCount, size_t outputComponentCount>
  inline void Copy8SintTo16SintVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      const size_t lastNonAlphaOutputComponent = std::min<size_t>(outputComponentCount, 3);
  
      for (size_t i = 0; i < count; i++)
      {
          const GLbyte *offsetInput = reinterpret_cast<const GLbyte*>(input + i * stride);
          GLshort *offsetOutput = reinterpret_cast<GLshort*>(output)+i * outputComponentCount;
  
          for (size_t j = 0; j < inputComponentCount; j++)
          {
              offsetOutput[j] = static_cast<GLshort>(offsetInput[j]);
          }
  
          for (size_t j = inputComponentCount; j < lastNonAlphaOutputComponent; j++)
          {
              // Set remaining G/B channels to 0.
              offsetOutput[j] = 0;
          }
  
          if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
          {
              // On integer formats, we must set the Alpha channel to 1 if it's unused.
              offsetOutput[3] = 1;
          }
      }
  }
  
  template <size_t inputComponentCount, size_t outputComponentCount>
  inline void Copy8SnormTo16SnormVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      for (size_t i = 0; i < count; i++)
      {
          const GLbyte *offsetInput = reinterpret_cast<const GLbyte*>(input + i * stride);
          GLshort *offsetOutput = reinterpret_cast<GLshort*>(output) + i * outputComponentCount;
  
          for (size_t j = 0; j < inputComponentCount; j++)
          {
              // The original GLbyte value ranges from -128 to +127 (INT8_MAX).
              // When converted to GLshort, the value must be scaled to between -32768 and +32767 (INT16_MAX).
              if (offsetInput[j] > 0)
              {
                  offsetOutput[j] = offsetInput[j] << 8 | offsetInput[j] << 1 | ((offsetInput[j] & 0x40) >> 6);
              }
              else
              {
                  offsetOutput[j] = offsetInput[j] << 8;
              }
          }
  
          for (size_t j = inputComponentCount; j < std::min<size_t>(outputComponentCount, 3); j++)
          {
              // Set remaining G/B channels to 0.
              offsetOutput[j] = 0;
          }
  
          if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
          {
              // On normalized formats, we must set the Alpha channel to the max value if it's unused.
              offsetOutput[3] = INT16_MAX;
          }
      }
  }
  
  template <size_t inputComponentCount, size_t outputComponentCount>
  inline void Copy32FixedTo32FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      static const float divisor = 1.0f / (1 << 16);
  
      for (size_t i = 0; i < count; i++)
      {
          const uint8_t *offsetInput = input + i * stride;
          float *offsetOutput        = reinterpret_cast<float *>(output) + i * outputComponentCount;
  
          // GLfixed access must be 4-byte aligned on arm32, input and stride sometimes are not
          if (reinterpret_cast<uintptr_t>(offsetInput) % sizeof(GLfixed) == 0)
          {
              for (size_t j = 0; j < inputComponentCount; j++)
              {
                  offsetOutput[j] =
                      static_cast<float>(reinterpret_cast<const GLfixed *>(offsetInput)[j]) * divisor;
              }
          }
          else
          {
              for (size_t j = 0; j < inputComponentCount; j++)
              {
                  GLfixed alignedInput;
                  memcpy(&alignedInput, offsetInput + j * sizeof(GLfixed), sizeof(GLfixed));
                  offsetOutput[j] = static_cast<float>(alignedInput) * divisor;
              }
          }
  
          // 4-component output formats would need special padding in the alpha channel.
          static_assert(!(inputComponentCount < 4 && outputComponentCount == 4),
                        "An inputComponentCount less than 4 and an outputComponentCount equal to 4 is not supported.");
  
          for (size_t j = inputComponentCount; j < outputComponentCount; j++)
          {
              offsetOutput[j] = 0.0f;
          }
      }
  }
  
  template <typename T, size_t inputComponentCount, size_t outputComponentCount, bool normalized>
  inline void CopyTo32FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      typedef std::numeric_limits<T> NL;
  
      for (size_t i = 0; i < count; i++)
      {
          const T *offsetInput = reinterpret_cast<const T*>(input + (stride * i));
          float *offsetOutput = reinterpret_cast<float*>(output) + i * outputComponentCount;
  
          for (size_t j = 0; j < inputComponentCount; j++)
          {
              if (normalized)
              {
                  if (NL::is_signed)
                  {
                      const float divisor = 1.0f / (2 * static_cast<float>(NL::max()) + 1);
                      offsetOutput[j] = (2 * static_cast<float>(offsetInput[j]) + 1) * divisor;
                  }
                  else
                  {
                      offsetOutput[j] =  static_cast<float>(offsetInput[j]) / NL::max();
                  }
              }
              else
              {
                  offsetOutput[j] =  static_cast<float>(offsetInput[j]);
              }
          }
  
          // This would require special padding.
          static_assert(!(inputComponentCount < 4 && outputComponentCount == 4),
                        "An inputComponentCount less than 4 and an outputComponentCount equal to 4 is not supported.");
  
          for (size_t j = inputComponentCount; j < outputComponentCount; j++)
          {
              offsetOutput[j] = 0.0f;
          }
      }
  }
  
  namespace priv
  {
  
  template <bool isSigned, bool normalized, bool toFloat>
  static inline void CopyPackedRGB(uint32_t data, uint8_t *output)
  {
      const uint32_t rgbSignMask = 0x200;       // 1 set at the 9 bit
      const uint32_t negativeMask = 0xFFFFFC00; // All bits from 10 to 31 set to 1
  
      if (toFloat)
      {
          GLfloat *floatOutput = reinterpret_cast<GLfloat*>(output);
          if (isSigned)
          {
              GLfloat finalValue = 0;
              if (data & rgbSignMask)
              {
                  int negativeNumber = data | negativeMask;
                  finalValue = static_cast<GLfloat>(negativeNumber);
              }
              else
              {
                  finalValue = static_cast<GLfloat>(data);
              }
  
              if (normalized)
              {
                  const int32_t maxValue = 0x1FF;      // 1 set in bits 0 through 8
                  const int32_t minValue = 0xFFFFFE01; // Inverse of maxValue
  
                  // A 10-bit two's complement number has the possibility of being minValue - 1 but
                  // OpenGL's normalization rules dictate that it should be clamped to minValue in this
                  // case.
                  if (finalValue < minValue)
                  {
                      finalValue = minValue;
                  }
  
                  const int32_t halfRange = (maxValue - minValue) >> 1;
                  *floatOutput = ((finalValue - minValue) / halfRange) - 1.0f;
              }
              else
              {
                  *floatOutput = finalValue;
              }
          }
          else
          {
              if (normalized)
              {
                  const uint32_t maxValue = 0x3FF; // 1 set in bits 0 through 9
                  *floatOutput = static_cast<GLfloat>(data) / static_cast<GLfloat>(maxValue);
              }
              else
              {
                  *floatOutput = static_cast<GLfloat>(data);
              }
          }
      }
      else
      {
          if (isSigned)
          {
              GLshort *intOutput = reinterpret_cast<GLshort*>(output);
  
              if (data & rgbSignMask)
              {
                  *intOutput = static_cast<GLshort>(data | negativeMask);
              }
              else
              {
                  *intOutput = static_cast<GLshort>(data);
              }
          }
          else
          {
              GLushort *uintOutput = reinterpret_cast<GLushort*>(output);
              *uintOutput = static_cast<GLushort>(data);
          }
      }
  }
  
  template <bool isSigned, bool normalized, bool toFloat>
  inline void CopyPackedAlpha(uint32_t data, uint8_t *output)
  {
      if (toFloat)
      {
          GLfloat *floatOutput = reinterpret_cast<GLfloat*>(output);
          if (isSigned)
          {
              if (normalized)
              {
                  switch (data)
                  {
                    case 0x0: *floatOutput =  0.0f; break;
                    case 0x1: *floatOutput =  1.0f; break;
                    case 0x2: *floatOutput = -1.0f; break;
                    case 0x3: *floatOutput = -1.0f; break;
                    default: UNREACHABLE();
                  }
              }
              else
              {
                  switch (data)
                  {
                    case 0x0: *floatOutput =  0.0f; break;
                    case 0x1: *floatOutput =  1.0f; break;
                    case 0x2: *floatOutput = -2.0f; break;
                    case 0x3: *floatOutput = -1.0f; break;
                    default: UNREACHABLE();
                  }
              }
          }
          else
          {
              if (normalized)
              {
                  switch (data)
                  {
                    case 0x0: *floatOutput = 0.0f / 3.0f; break;
                    case 0x1: *floatOutput = 1.0f / 3.0f; break;
                    case 0x2: *floatOutput = 2.0f / 3.0f; break;
                    case 0x3: *floatOutput = 3.0f / 3.0f; break;
                    default: UNREACHABLE();
                  }
              }
              else
              {
                  switch (data)
                  {
                    case 0x0: *floatOutput = 0.0f; break;
                    case 0x1: *floatOutput = 1.0f; break;
                    case 0x2: *floatOutput = 2.0f; break;
                    case 0x3: *floatOutput = 3.0f; break;
                    default: UNREACHABLE();
                  }
              }
          }
      }
      else
      {
          if (isSigned)
          {
              GLshort *intOutput = reinterpret_cast<GLshort*>(output);
              switch (data)
              {
                case 0x0: *intOutput =  0; break;
                case 0x1: *intOutput =  1; break;
                case 0x2: *intOutput = -2; break;
                case 0x3: *intOutput = -1; break;
                default: UNREACHABLE();
              }
          }
          else
          {
              GLushort *uintOutput = reinterpret_cast<GLushort*>(output);
              switch (data)
              {
                case 0x0: *uintOutput = 0; break;
                case 0x1: *uintOutput = 1; break;
                case 0x2: *uintOutput = 2; break;
                case 0x3: *uintOutput = 3; break;
                default: UNREACHABLE();
              }
          }
      }
  }
  
  }
  
  template <bool isSigned, bool normalized, bool toFloat>
  inline void CopyXYZ10W2ToXYZW32FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
  {
      const size_t outputComponentSize = toFloat ? 4 : 2;
      const size_t componentCount = 4;
  
      const uint32_t rgbMask = 0x3FF; // 1 set in bits 0 through 9
      const size_t redShift = 0;    // red is bits 0 through 9
      const size_t greenShift = 10; // green is bits 10 through 19
      const size_t blueShift = 20;  // blue is bits 20 through 29
  
      const uint32_t alphaMask = 0x3; // 1 set in bits 0 and 1
      const size_t alphaShift = 30; // Alpha is the 30 and 31 bits
  
      for (size_t i = 0; i < count; i++)
      {
          GLuint packedValue = *reinterpret_cast<const GLuint*>(input + (i * stride));
          uint8_t *offsetOutput = output + (i * outputComponentSize * componentCount);
  
          priv::CopyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> redShift)   & rgbMask,   offsetOutput + (0 * outputComponentSize));
          priv::CopyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> greenShift) & rgbMask,   offsetOutput + (1 * outputComponentSize));
          priv::CopyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> blueShift)  & rgbMask,   offsetOutput + (2 * outputComponentSize));
          priv::CopyPackedAlpha<isSigned, normalized, toFloat>((packedValue >> alphaShift) & alphaMask, offsetOutput + (3 * outputComponentSize));
      }
  }
  
  }