kc3-lang/angle/src/libGLESv2/renderer/copyvertex.h

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• Hash : 2f612290
  Author :
  Date : 2014-03-05T09:53:29
  

  Combine widen and defaultBits params of copyVertexData.
  
  Since we never, and never will use a default value of zero
  for the alpha channel, we can use a value of zero to
  indicate no widening. This has the benefit of not needing
  a default value where it does not apply.
  
  BUG=angle:550
  
  Change-Id: Ifdfedcb16039aa1d7f8ee644b65c6b4d89f9a384
  Reviewed-on: https://chromium-review.googlesource.com/188432
  Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libGLESv2/renderer/copyvertex.h

• //
  // Copyright (c) 2013 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.h: Defines vertex buffer copying and conversion functions
  
  #ifndef LIBGLESV2_RENDERER_COPYVERTEX_H_
  #define LIBGLESV2_RENDERER_COPYVERTEX_H_
  
  #include "common/mathutil.h"
  
  // 'widenDefaultValueBits' gives the default value for the alpha channel (4th component)
  //  the sentinel value 0 means we do not want to widen the input or add an alpha channel
  template <typename T, unsigned int componentCount, unsigned int widenDefaultValueBits>
  inline void copyVertexData(const void *input, size_t stride, size_t count, void *output)
  {
      const unsigned int attribSize = sizeof(T) * componentCount;
      const T defaultValue = gl::bitCast<T>(widenDefaultValueBits);
      const bool widen = (widenDefaultValueBits != 0);
  
      if (attribSize == stride && !widen)
      {
          memcpy(output, input, count * attribSize);
      }
      else
      {
          unsigned int outputStride = widen ? 4 : componentCount;
  
          for (unsigned int i = 0; i < count; i++)
          {
              const T *offsetInput = reinterpret_cast<const T*>(reinterpret_cast<const char*>(input) + i * stride);
              T *offsetOutput = reinterpret_cast<T*>(output) + i * outputStride;
  
              for (unsigned int j = 0; j < componentCount; j++)
              {
                  offsetOutput[j] = offsetInput[j];
              }
  
              if (widen)
              {
                  offsetOutput[3] = defaultValue;
              }
          }
      }
  }
  
  template <unsigned int componentCount>
  inline void copyFixedVertexData(const void* input, size_t stride, size_t count, void* output)
  {
      static const float divisor = 1.0f / (1 << 16);
  
      for (unsigned int i = 0; i < count; i++)
      {
          const GLfixed* offsetInput = reinterpret_cast<const GLfixed*>(reinterpret_cast<const char*>(input) + stride * i);
          float* offsetOutput = reinterpret_cast<float*>(output) + i * componentCount;
  
          for (unsigned int j = 0; j < componentCount; j++)
          {
              offsetOutput[j] = static_cast<float>(offsetInput[j]) * divisor;
          }
      }
  }
  
  template <typename T, unsigned int componentCount, bool normalized>
  inline void copyToFloatVertexData(const void* input, size_t stride, size_t count, void* output)
  {
      typedef std::numeric_limits<T> NL;
  
      for (unsigned int i = 0; i < count; i++)
      {
          const T *offsetInput = reinterpret_cast<const T*>(reinterpret_cast<const char*>(input) + stride * i);
          float *offsetOutput = reinterpret_cast<float*>(output) + i * componentCount;
  
          for (unsigned int j = 0; j < componentCount; 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]);
              }
          }
      }
  }
  
  inline void copyPackedUnsignedVertexData(const void* input, size_t stride, size_t count, void* output)
  {
      const unsigned int attribSize = 4;
  
      if (attribSize == stride)
      {
          memcpy(output, input, count * attribSize);
      }
      else
      {
          for (unsigned int i = 0; i < count; i++)
          {
              const GLuint *offsetInput = reinterpret_cast<const GLuint*>(reinterpret_cast<const char*>(input) + (i * stride));
              GLuint *offsetOutput = reinterpret_cast<GLuint*>(output) + (i * attribSize);
  
              offsetOutput[i] = offsetInput[i];
          }
      }
  }
  
  template <bool isSigned, bool normalized, bool toFloat>
  static inline void copyPackedRGB(unsigned int data, void *output)
  {
      const unsigned int rgbSignMask = 0x200;       // 1 set at the 9 bit
      const unsigned int 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 int maxValue = 0x1FF;      // 1 set in bits 0 through 8
                  const int 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 int halfRange = (maxValue - minValue) >> 1;
                  *floatOutput = ((finalValue - minValue) / halfRange) - 1.0f;
              }
              else
              {
                  *floatOutput = finalValue;
              }
          }
          else
          {
              if (normalized)
              {
                  const unsigned int 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 = data | negativeMask;
              }
              else
              {
                  *intOutput = data;
              }
          }
          else
          {
              GLushort *uintOutput = reinterpret_cast<GLushort*>(output);
              *uintOutput = data;
          }
      }
  }
  
  template <bool isSigned, bool normalized, bool toFloat>
  inline void copyPackedAlpha(unsigned int data, void *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 copyPackedVertexData(const void* input, size_t stride, size_t count, void* output)
  {
      const unsigned int outputComponentSize = toFloat ? 4 : 2;
      const unsigned int componentCount = 4;
  
      const unsigned int rgbMask = 0x3FF; // 1 set in bits 0 through 9
      const unsigned int redShift = 0;    // red is bits 0 through 9
      const unsigned int greenShift = 10; // green is bits 10 through 19
      const unsigned int blueShift = 20;  // blue is bits 20 through 29
  
      const unsigned int alphaMask = 0x3; // 1 set in bits 0 and 1
      const unsigned int alphaShift = 30; // Alpha is the 30 and 31 bits
  
      for (unsigned int i = 0; i < count; i++)
      {
          GLuint packedValue = *reinterpret_cast<const GLuint*>(reinterpret_cast<const char*>(input) + (i * stride));
          GLbyte *offsetOutput = reinterpret_cast<GLbyte*>(output) + (i * outputComponentSize * componentCount);
  
          copyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> redShift) & rgbMask,     offsetOutput + (0 * outputComponentSize));
          copyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> greenShift) & rgbMask,   offsetOutput + (1 * outputComponentSize));
          copyPackedRGB<isSigned, normalized, toFloat>(  (packedValue >> blueShift) & rgbMask,    offsetOutput + (2 * outputComponentSize));
          copyPackedAlpha<isSigned, normalized, toFloat>((packedValue >> alphaShift) & alphaMask, offsetOutput + (3* outputComponentSize));
      }
  }
  
  #endif // LIBGLESV2_RENDERER_COPYVERTEX_H_
  

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