kc3-lang/angle/src/libGLESv2/ImageIndex.cpp

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• Hash : ef4ac5b1
  Author :
  Date : 2014-09-29T10:46:11
  

  Add ImageIndexIterator.
  
  We can use image index iterators to iterate over all images in a
  Texture. This allows us to do some operations in TextureD3D rather
  than in the typed subclasses and save on some repeated code.
  
  BUG=angle:729
  
  Change-Id: I3ba47b2eebad2cfca313117fd501ff76d5107044
  Reviewed-on: https://chromium-review.googlesource.com/219834
  Tested-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Brandon Jones <bajones@chromium.org>
  

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• src/libGLESv2/ImageIndex.cpp

• //
  // 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.
  //
  
  // ImageIndex.cpp: Implementation for ImageIndex methods.
  
  #include "libGLESv2/ImageIndex.h"
  #include "libGLESv2/Texture.h"
  #include "common/utilities.h"
  
  namespace gl
  {
  
  ImageIndex::ImageIndex(const ImageIndex &other)
      : type(other.type),
        mipIndex(other.mipIndex),
        layerIndex(other.layerIndex)
  {}
  
  ImageIndex &ImageIndex::operator=(const ImageIndex &other)
  {
      type = other.type;
      mipIndex = other.mipIndex;
      layerIndex = other.layerIndex;
      return *this;
  }
  
  ImageIndex ImageIndex::Make2D(GLint mipIndex)
  {
      return ImageIndex(GL_TEXTURE_2D, mipIndex, ENTIRE_LEVEL);
  }
  
  ImageIndex ImageIndex::MakeCube(GLenum target, GLint mipIndex)
  {
      ASSERT(gl::IsCubemapTextureTarget(target));
      return ImageIndex(target, mipIndex, TextureCubeMap::targetToLayerIndex(target));
  }
  
  ImageIndex ImageIndex::Make2DArray(GLint mipIndex, GLint layerIndex)
  {
      return ImageIndex(GL_TEXTURE_2D_ARRAY, mipIndex, layerIndex);
  }
  
  ImageIndex ImageIndex::Make3D(GLint mipIndex, GLint layerIndex)
  {
      return ImageIndex(GL_TEXTURE_3D, mipIndex, layerIndex);
  }
  
  ImageIndex::ImageIndex(GLenum typeIn, GLint mipIndexIn, GLint layerIndexIn)
      : type(typeIn),
        mipIndex(mipIndexIn),
        layerIndex(layerIndexIn)
  {}
  
  ImageIndexIterator ImageIndexIterator::Make2D(GLint minMip, GLint maxMip)
  {
      return ImageIndexIterator(GL_TEXTURE_2D, rx::Range<GLint>(minMip, maxMip),
                                rx::Range<GLint>(ImageIndex::ENTIRE_LEVEL, ImageIndex::ENTIRE_LEVEL), NULL);
  }
  
  ImageIndexIterator ImageIndexIterator::MakeCube(GLint minMip, GLint maxMip)
  {
      return ImageIndexIterator(GL_TEXTURE_CUBE_MAP, rx::Range<GLint>(minMip, maxMip), rx::Range<GLint>(0, 6), NULL);
  }
  
  ImageIndexIterator ImageIndexIterator::Make3D(GLint minMip, GLint maxMip,
                                                GLint minLayer, GLint maxLayer)
  {
      return ImageIndexIterator(GL_TEXTURE_3D, rx::Range<GLint>(minMip, maxMip), rx::Range<GLint>(minLayer, maxLayer), NULL);
  }
  
  ImageIndexIterator ImageIndexIterator::Make2DArray(GLint minMip, GLint maxMip,
                                                     const GLsizei *layerCounts)
  {
      return ImageIndexIterator(GL_TEXTURE_2D_ARRAY, rx::Range<GLint>(minMip, maxMip),
                                rx::Range<GLint>(0, IMPLEMENTATION_MAX_2D_ARRAY_TEXTURE_LAYERS), layerCounts);
  }
  
  ImageIndexIterator::ImageIndexIterator(GLenum type, const rx::Range<GLint> &mipRange,
                                         const rx::Range<GLint> &layerRange, const GLsizei *layerCounts)
      : mType(type),
        mMipRange(mipRange),
        mLayerRange(layerRange),
        mLayerCounts(layerCounts),
        mCurrentMip(mipRange.start),
        mCurrentLayer(layerRange.start)
  {}
  
  GLint ImageIndexIterator::maxLayer() const
  {
      return (mLayerCounts ? static_cast<GLint>(mLayerCounts[mCurrentMip]) : mLayerRange.end);
  }
  
  ImageIndex ImageIndexIterator::next()
  {
      ASSERT(hasNext());
  
      ImageIndex value = current();
  
      // Iterate layers in the inner loop for now. We can add switchable
      // layer or mip iteration if we need it.
  
      if (mCurrentLayer != ImageIndex::ENTIRE_LEVEL)
      {
          if (mCurrentLayer < maxLayer()-1)
          {
              mCurrentLayer++;
          }
          else if (mCurrentMip < mMipRange.end-1)
          {
              mCurrentMip++;
              mCurrentLayer = mLayerRange.start;
          }
      }
      else if (mCurrentMip < mMipRange.end-1)
      {
          mCurrentMip++;
          mCurrentLayer = mLayerRange.start;
      }
  
      return value;
  }
  
  ImageIndex ImageIndexIterator::current() const
  {
      ImageIndex value(mType, mCurrentMip, mCurrentLayer);
  
      if (mType == GL_TEXTURE_CUBE_MAP)
      {
          value.type = TextureCubeMap::layerIndexToTarget(mCurrentLayer);
      }
  
      return value;
  }
  
  bool ImageIndexIterator::hasNext() const
  {
      return (mCurrentMip < mMipRange.end || mCurrentLayer < maxLayer());
  }
  
  }
  

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