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

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• Hash : 75ce3f21
  Author :
  Date : 2013-05-31T12:00:37
  

  Moved the image format types into their own header.
  
  TRAC #23256
  
  Signed-off-by: Jamie Madill
  Signed-off-by: Shannon Woods
  Author: Geoff Lang
  

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• src/libGLESv2/renderer/generatemip.h

• //
  // Copyright (c) 2002-2012 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.
  //
  
  // generatemip.h: Defines the GenerateMip function, templated on the format
  // type of the image for which mip levels are being generated.
  
  #ifndef LIBGLESV2_RENDERER_GENERATEMIP_H_
  #define LIBGLESV2_RENDERER_GENERATEMIP_H_
  
  #include "common/mathutil.h"
  #include "imageformats.h"
  
  namespace rx
  {
  
  namespace priv
  {
  
  template <typename T>
  static inline T *GetPixel(void *data, unsigned int x, unsigned int y, unsigned int z, unsigned int rowPitch, unsigned int depthPitch)
  {
      return reinterpret_cast<T*>(reinterpret_cast<unsigned char*>(data) + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
  }
  
  template <typename T>
  static inline const T *GetPixel(const void *data, unsigned int x, unsigned int y, unsigned int z, unsigned int rowPitch, unsigned int depthPitch)
  {
      return reinterpret_cast<const T*>(reinterpret_cast<const unsigned char*>(data) + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
  }
  
  template <typename T>
  static void GenerateMip_Y(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                            const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                            unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                            unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth == 1);
      ASSERT(sourceHeight > 1);
      ASSERT(sourceDepth == 1);
  
      for (unsigned int y = 0; y < destHeight; y++)
      {
          const T *src0 = GetPixel<T>(sourceData, 0, y * 2, 0, sourceRowPitch, sourceDepthPitch);
          const T *src1 = GetPixel<T>(sourceData, 0, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
          T *dst = GetPixel<T>(destData, 0, y, 0, destRowPitch, destDepthPitch);
  
          T::average(dst, src0, src1);
      }
  }
  
  template <typename T>
  static void GenerateMip_X(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                            const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                            unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                            unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth > 1);
      ASSERT(sourceHeight == 1);
      ASSERT(sourceDepth == 1);
  
      for (unsigned int x = 0; x < destWidth; x++)
      {
          const T *src0 = GetPixel<T>(sourceData, x * 2, 0, 0, sourceRowPitch, sourceDepthPitch);
          const T *src1 = GetPixel<T>(sourceData, x * 2 + 1, 0, 0, sourceRowPitch, sourceDepthPitch);
          T *dst = GetPixel<T>(destData, x, 0, 0, destRowPitch, destDepthPitch);
  
          T::average(dst, src0, src1);
      }
  }
  
  template <typename T>
  static void GenerateMip_Z(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                            const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                            unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                            unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth == 1);
      ASSERT(sourceHeight == 1);
      ASSERT(sourceDepth > 1);
  
      for (unsigned int z = 0; z < destDepth; z++)
      {
          const T *src0 = GetPixel<T>(sourceData, 0, 0, z * 2, sourceRowPitch, sourceDepthPitch);
          const T *src1 = GetPixel<T>(sourceData, 0, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
          T *dst = GetPixel<T>(destData, 0, 0, z, destRowPitch, destDepthPitch);
  
          T::average(dst, src0, src1);
      }
  }
  
  template <typename T>
  static void GenerateMip_XY(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                             const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                             unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                             unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth > 1);
      ASSERT(sourceHeight > 1);
      ASSERT(sourceDepth == 1);
  
      for (unsigned int y = 0; y < destHeight; y++)
      {
          for (unsigned int x = 0; x < destWidth; x++)
          {
              const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, 0, sourceRowPitch, sourceDepthPitch);
              const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
              const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, 0, sourceRowPitch, sourceDepthPitch);
              const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
              T *dst = GetPixel<T>(destData, x, y, 0, destRowPitch, destDepthPitch);
  
              T tmp0, tmp1;
  
              T::average(&tmp0, src0, src1);
              T::average(&tmp1, src2, src3);
              T::average(dst, &tmp0, &tmp1);
          }
      }
  }
  
  template <typename T>
  static void GenerateMip_YZ(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                             const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                             unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                             unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth == 1);
      ASSERT(sourceHeight > 1);
      ASSERT(sourceDepth > 1);
  
      for (unsigned int z = 0; z < destDepth; z++)
      {
          for (unsigned int y = 0; y < destHeight; y++)
          {
              const T *src0 = GetPixel<T>(sourceData, 0, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
              const T *src1 = GetPixel<T>(sourceData, 0, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
              const T *src2 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
              const T *src3 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
              T *dst = GetPixel<T>(destData, 0, y, z, destRowPitch, destDepthPitch);
  
              T tmp0, tmp1;
  
              T::average(&tmp0, src0, src1);
              T::average(&tmp1, src2, src3);
              T::average(dst, &tmp0, &tmp1);
          }
      }
  }
  
  template <typename T>
  static void GenerateMip_XZ(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                             const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                             unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                             unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth > 1);
      ASSERT(sourceHeight == 1);
      ASSERT(sourceDepth > 1);
  
      for (unsigned int z = 0; z < destDepth; z++)
      {
          for (unsigned int x = 0; x < destWidth; x++)
          {
              const T *src0 = GetPixel<T>(sourceData, x * 2, 0, z * 2, sourceRowPitch, sourceDepthPitch);
              const T *src1 = GetPixel<T>(sourceData, x * 2, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
              const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2, sourceRowPitch, sourceDepthPitch);
              const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
              T *dst = GetPixel<T>(destData, x, 0, z, destRowPitch, destDepthPitch);
  
              T tmp0, tmp1;
  
              T::average(&tmp0, src0, src1);
              T::average(&tmp1, src2, src3);
              T::average(dst, &tmp0, &tmp1);
          }
      }
  }
  
  template <typename T>
  static void GenerateMip_XYZ(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                              const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                              unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                              unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      ASSERT(sourceWidth > 1);
      ASSERT(sourceHeight > 1);
      ASSERT(sourceDepth > 1);
  
      for (unsigned int z = 0; z < destDepth; z++)
      {
          for (unsigned int y = 0; y < destHeight; y++)
          {
              for (unsigned int x = 0; x < destWidth; x++)
              {
                  const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
                  const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                  const T *src2 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
                  const T *src3 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                  const T *src4 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
                  const T *src5 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                  const T *src6 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
                  const T *src7 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                  T *dst = GetPixel<T>(destData, x, y, z, destRowPitch, destDepthPitch);
  
                  T tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
  
                  T::average(&tmp0, src0, src1);
                  T::average(&tmp1, src2, src3);
                  T::average(&tmp2, src4, src5);
                  T::average(&tmp3, src6, src7);
  
                  T::average(&tmp4, &tmp0, &tmp1);
                  T::average(&tmp5, &tmp2, &tmp3);
  
                  T::average(dst, &tmp4, &tmp5);
              }
          }
      }
  }
  
  
  typedef void (*MipGenerationFunction)(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                                        const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                                        unsigned int destWidth, unsigned int destHeight, unsigned int destDepth,
                                        unsigned char *destData, int destRowPitch, int destDepthPitch);
  
  template <typename T>
  static MipGenerationFunction GetMipGenerationFunction(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth)
  {
      unsigned char index = ((sourceWidth > 1)  ? 1 : 0) |
                            ((sourceHeight > 1) ? 2 : 0) |
                            ((sourceDepth > 1)  ? 4 : 0);
  
      switch (index)
      {
        case 1:  return GenerateMip_X<T>;   // W x 1 x 1
        case 2:  return GenerateMip_Y<T>;   // 1 x H x 1
        case 3:  return GenerateMip_XY<T>;  // W x H x 1
        case 4:  return GenerateMip_Z<T>;   // 1 x 1 x D
        case 5:  return GenerateMip_XZ<T>;  // W x 1 x D
        case 6:  return GenerateMip_YZ<T>;  // 1 x H x D
        case 7:  return GenerateMip_XYZ<T>; // W x H x D
        default: return NULL;
      }
  }
  
  }
  
  template <typename T>
  static void GenerateMip(unsigned int sourceWidth, unsigned int sourceHeight, unsigned int sourceDepth,
                          const unsigned char *sourceData, int sourceRowPitch, int sourceDepthPitch,
                          unsigned char *destData, int destRowPitch, int destDepthPitch)
  {
      unsigned int mipWidth = std::max(1U, sourceWidth >> 1);
      unsigned int mipHeight = std::max(1U, sourceHeight >> 1);
      unsigned int mipDepth = std::max(1U, sourceDepth >> 1);
  
      priv::MipGenerationFunction generationFunction = priv::GetMipGenerationFunction<T>(sourceWidth, sourceHeight, sourceDepth);
      ASSERT(generationFunction != NULL);
  
      generationFunction(sourceWidth, sourceHeight, sourceDepth, sourceData, sourceRowPitch, sourceDepthPitch,
                         mipWidth, mipHeight, mipDepth, destData, destRowPitch, destDepthPitch);
  }
  
  }
  
  #endif // LIBGLESV2_RENDERER_GENERATEMIP_H_
  

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