kc3-lang/angle/src/image_util/loadimage.inc

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• Hash : ff7aa214
  Author :
  Date : 2022-09-29T19:56:28
  

  GL_PALETTE* sampling
  
  Implement GL_PALETTE* formats by decoding them into
  a R8G8B8A8_UNORM image at load time.
  
  Test: angle_end2end_tests --gtest_filter="PalettedTextureTest.*"
  Bug: angleproject:7599
  Bug: angleproject:7688
  Bug: angleproject:7710
  Change-Id: I94d51e2c480fcdd39f1a0ad241b311d3b4de1579
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3863251
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Constantine Shablya <constantine.shablya@collabora.com>
  

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• src/image_util/loadimage.inc

• //
  // Copyright 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.
  //
  
  #include "common/mathutil.h"
  
  #include <string.h>
  
  namespace angle
  {
  
  namespace priv
  {
  
  template <typename T>
  inline T *OffsetDataPointer(uint8_t *data, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
  {
      return reinterpret_cast<T*>(data + (y * rowPitch) + (z * depthPitch));
  }
  
  template <typename T>
  inline const T *OffsetDataPointer(const uint8_t *data, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
  {
      return reinterpret_cast<const T*>(data + (y * rowPitch) + (z * depthPitch));
  }
  
  }  // namespace priv
  
  template <typename type, size_t componentCount>
  inline void LoadToNative(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)
  {
      const size_t rowSize = width * sizeof(type) * componentCount;
      const size_t layerSize = rowSize * height;
      const size_t imageSize = layerSize * depth;
  
      if (layerSize == inputDepthPitch && layerSize == outputDepthPitch)
      {
          ASSERT(rowSize == inputRowPitch && rowSize == outputRowPitch);
          memcpy(output, input, imageSize);
      }
      else if (rowSize == inputRowPitch && rowSize == outputRowPitch)
      {
          for (size_t z = 0; z < depth; z++)
          {
              const type *source = priv::OffsetDataPointer<type>(input, 0, z, inputRowPitch, inputDepthPitch);
              type *dest = priv::OffsetDataPointer<type>(output, 0, z, outputRowPitch, outputDepthPitch);
  
              memcpy(dest, source, layerSize);
          }
      }
      else
      {
          for (size_t z = 0; z < depth; z++)
          {
              for (size_t y = 0; y < height; y++)
              {
                  const type *source = priv::OffsetDataPointer<type>(input, y, z, inputRowPitch, inputDepthPitch);
                  type *dest = priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
                  memcpy(dest, source, width * sizeof(type) * componentCount);
              }
          }
      }
  }
  
  template <typename type, uint32_t fourthComponentBits>
  inline void LoadToNative3To4(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)
  {
      const type fourthValue = gl::bitCast<type>(fourthComponentBits);
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const type *source = priv::OffsetDataPointer<type>(input, y, z, inputRowPitch, inputDepthPitch);
              type *dest = priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
              for (size_t x = 0; x < width; x++)
              {
                  memcpy(&dest[x * 4], &source[x * 3], sizeof(type) * 3);
                  dest[x * 4 + 3] = fourthValue;
              }
          }
      }
  }
  
  template <size_t componentCount>
  inline void Load32FTo16F(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)
  {
      const size_t elementWidth = componentCount * width;
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const float *source = priv::OffsetDataPointer<float>(input, y, z, inputRowPitch, inputDepthPitch);
              uint16_t *dest = priv::OffsetDataPointer<uint16_t>(output, y, z, outputRowPitch, outputDepthPitch);
  
              for (size_t x = 0; x < elementWidth; x++)
              {
                  dest[x] = gl::float32ToFloat16(source[x]);
              }
          }
      }
  }
  
  template <size_t blockWidth, size_t blockHeight, size_t blockDepth, size_t blockSize>
  inline void LoadCompressedToNative(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)
  {
      const size_t columns = (width + (blockWidth - 1)) / blockWidth;
      const size_t rows = (height + (blockHeight - 1)) / blockHeight;
      const size_t layers = (depth + (blockDepth - 1)) / blockDepth;
  
      for (size_t z = 0; z < layers; ++z)
      {
          for (size_t y = 0; y < rows; ++y)
          {
              const uint8_t *source = priv::OffsetDataPointer<uint8_t>(input, y, z, inputRowPitch, inputDepthPitch);
              uint8_t *dest = priv::OffsetDataPointer<uint8_t>(output, y, z, outputRowPitch, outputDepthPitch);
              memcpy(dest, source, columns * blockSize);
          }
      }
  }
  
  template <typename type, uint32_t firstBits, uint32_t secondBits, uint32_t thirdBits, uint32_t fourthBits>
  inline void Initialize4ComponentData(size_t width, size_t height, size_t depth,
                                       uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      type writeValues[4] =
      {
          gl::bitCast<type>(firstBits),
          gl::bitCast<type>(secondBits),
          gl::bitCast<type>(thirdBits),
          gl::bitCast<type>(fourthBits),
      };
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              type *destRow = priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
              for (size_t x = 0; x < width; x++)
              {
                  type* destPixel = destRow + x * 4;
  
                  // This could potentially be optimized by generating an entire row of initialization
                  // data and copying row by row instead of pixel by pixel.
                  memcpy(destPixel, writeValues, sizeof(type) * 4);
              }
          }
      }
  }
  
  template <size_t blockWidth, size_t blockHeight>
  inline void LoadASTCToRGBA8(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)
  {
      LoadASTCToRGBA8Inner(width, height, depth, blockWidth, blockHeight, input, inputRowPitch,
                           inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <uint32_t indexBits, uint32_t redBlueBits, uint32_t greenBits, uint32_t alphaBits>
  inline void LoadPalettedToRGBA8(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)
  {
      static_assert(indexBits == 4 || indexBits == 8);
      static_assert(redBlueBits == 4 || redBlueBits == 5 || redBlueBits == 8);
      static_assert(greenBits == 4 || greenBits == 5 || greenBits == 6 || greenBits == 8);
      static_assert(alphaBits == 0 || alphaBits == 1 || alphaBits == 4 || alphaBits == 8);
      constexpr uint32_t colorBits = 2 * redBlueBits + greenBits + alphaBits;
      static_assert(colorBits == 16 || colorBits == 24 || colorBits == 32);
  
      LoadPalettedToRGBA8Impl(width, height, depth,
                              indexBits, redBlueBits, greenBits, alphaBits,
                              input, inputRowPitch, inputDepthPitch,
                              output, outputRowPitch, outputDepthPitch);
  }
  
  } // namespace angle
  

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