text: ///////////////////////////////////////////////////////////////////////////////////
  /// OpenGL Image (gli.g-truc.net)
  ///
  /// Copyright (c) 2008 - 2013 G-Truc Creation (www.g-truc.net)
  /// Permission is hereby granted, free of charge, to any person obtaining a copy
  /// of this software and associated documentation files (the "Software"), to deal
  /// in the Software without restriction, including without limitation the rights
  /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  /// copies of the Software, and to permit persons to whom the Software is
  /// furnished to do so, subject to the following conditions:
  /// 
  /// The above copyright notice and this permission notice shall be included in
  /// all copies or substantial portions of the Software.
  /// 
  /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  /// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  /// THE SOFTWARE.
  ///
  /// @ref core
  /// @file gli/core/core_view.cpp
  /// @date 2013-02-03 / 2013-02-03
  /// @author Christophe Riccio
  ///////////////////////////////////////////////////////////////////////////////////
  
  #include <gli/gli.hpp>
  #include <gli/core/levels.hpp>
  
  int test_view1D
  (
  	std::vector<gli::format> const & Formats,
  	gli::texture1D::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::texture1D TextureA(Formats[i], TextureSize);
  		gli::texture1D TextureViewA(TextureA, TextureA.base_level(), TextureA.max_level());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::texture1D TextureViewC = gli::view(TextureA, TextureA.base_level(), TextureA.max_level());
  
  		Error += TextureA == TextureViewC ? 0 : 1;
  		Error += TextureViewA == TextureViewC ? 0 : 1;
  
  		gli::texture1D TextureB(Formats[i], TextureSize / gli::texture1D::dim_type(2));
  		gli::texture1D TextureViewB(TextureA, TextureA.base_level() + 1, TextureA.max_level());
  
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::texture1D TextureViewD = gli::view(TextureA, TextureA.base_level() + 1, TextureA.max_level());
  
  		Error += TextureB == TextureViewD ? 0 : 1;
  		Error += TextureViewB == TextureViewD ? 0 : 1;
  
  		gli::texture1D TextureD(TextureA, 1, 3);
  
  		Error += TextureA[1] == TextureD[0] ? 0 : 1;
  		Error += TextureA[2] == TextureD[1] ? 0 : 1;
  
  		gli::texture1D TextureE(TextureD, 1, 1);
  
  		Error += TextureE[0] == TextureD[1] ? 0 : 1;
  		Error += TextureE[0] == TextureA[2] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_view1DArray
  (
  	std::vector<gli::format> const & Formats,
  	gli::texture1DArray::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::texture1DArray TextureA(gli::texture1DArray::size_type(4), Formats[i], TextureSize);
  
  		gli::texture1DArray TextureViewA(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::texture1DArray TextureViewC = gli::view(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel(), TextureA.maxLevel());
  		
  		Error += TextureA == TextureViewC ? 0 : 1;
  		Error += TextureViewC == TextureViewA ? 0 : 1;
  
  		gli::texture1DArray TextureB(gli::texture1DArray::size_type(4), Formats[i], TextureSize / gli::texture1DArray::dim_type(2));
  
  		Error += TextureA != TextureB ? 0 : 1;
  
  		gli::texture1DArray TextureViewB(TextureA,
  			TextureA.baseLayer(), TextureA.maxLayer(),
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureA != TextureViewB ? 0 : 1;
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::texture1DArray TextureViewD = gli::view(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewD == TextureViewB ? 0 : 1;
  
  		gli::texture1DArray TextureD(TextureA, 0, TextureA.layers() -1, 1, 3);
  
  		Error += TextureA[0][1] == TextureD[0][0] ? 0 : 1;
  		Error += TextureA[0][2] == TextureD[0][1] ? 0 : 1;
  
  		gli::texture1DArray TextureE(TextureD, 0, TextureD.layers() -1, 0, TextureD.levels() - 1);
  
  		Error += TextureE == TextureD ? 0 : 1;
  		Error += TextureE[0] == TextureD[0] ? 0 : 1;
  
  		gli::texture1DArray TextureF(TextureE, 1, 3, 0, TextureE.levels() - 1);
  
  		Error += TextureF[0] == TextureD[1] ? 0 : 1;
  		Error += TextureF[0] == TextureE[1] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_view2D
  (
  	std::vector<gli::format> const & Formats,
  	gli::texture2D::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::texture2D TextureA(gli::levels(TextureSize), Formats[i], TextureSize);
  
  		for(std::size_t Index = 0; Index < TextureA.size<glm::byte>(); ++Index)
  			*(TextureA.data<glm::byte>() + Index) = glm::byte(Index);
  
  		gli::texture2D TextureViewA(TextureA, TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::texture2D TextureD(TextureA, 1, 3);
  
  		Error += TextureA[1] == TextureD[0] ? 0 : 1;
  		Error += TextureA[2] == TextureD[1] ? 0 : 1;
  
  		gli::texture2D TextureE(TextureD, 1, 1);
  
  		Error += TextureE[0] == TextureD[1] ? 0 : 1;
  		Error += TextureE[0] == TextureA[2] ? 0 : 1;
  
  		gli::texture2D TextureViewB(TextureA, 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		gli::texture2D TextureViewD = gli::view(TextureA, 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewD == TextureViewB ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_view2DArray
  (
  	std::vector<gli::format> const & Formats, 
  	gli::texture2DArray::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::texture2DArray TextureA(gli::texture2DArray::size_type(4), gli::levels(TextureSize), Formats[i], TextureSize);
  
  		gli::texture2DArray TextureViewA(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::texture2DArray TextureB(gli::texture2DArray::size_type(4), Formats[i], TextureSize / gli::texture2DArray::dim_type(2));
  
  		gli::texture2DArray TextureViewB(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		gli::texture2DArray TextureViewD = gli::view(TextureA, 
  			TextureA.baseLayer(), TextureA.maxLayer(), 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewB == TextureViewD ? 0 : 1;
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::texture2DArray TextureD(TextureA, 0, TextureA.layers() -1, 1, 3);
  
  		Error += TextureA[0][1] == TextureD[0][0] ? 0 : 1;
  		Error += TextureA[0][2] == TextureD[0][1] ? 0 : 1;
  
  		gli::texture2DArray TextureE(TextureD, 0, TextureD.layers() -1, 0, TextureD.levels() - 1);
  
  		Error += TextureE == TextureD ? 0 : 1;
  		Error += TextureE[0] == TextureD[0] ? 0 : 1;
  
  		gli::texture2DArray TextureF(TextureE, 1, 3, 0, TextureE.levels() - 1);
  
  		Error += TextureF[0] == TextureD[1] ? 0 : 1;
  		Error += TextureF[0] == TextureE[1] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_view3D
  (
  	std::vector<gli::format> const & Formats, 
  	gli::texture3D::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::texture3D TextureA(gli::levels(TextureSize), Formats[i], TextureSize);
  		gli::texture3D TextureViewA(TextureA, TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::texture3D::dim_type SizeB(TextureSize / gli::texture3D::dim_type(2));
  		gli::texture3D TextureB(gli::levels(SizeB), Formats[i], SizeB);
  
  		gli::texture3D TextureViewB(TextureA, 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::texture3D TextureViewD = gli::view(TextureA, 
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewD == TextureViewB ? 0 : 1;
  
  		gli::texture3D TextureD(TextureA, 1, 3);
  
  		Error += TextureA[1] == TextureD[0] ? 0 : 1;
  		Error += TextureA[2] == TextureD[1] ? 0 : 1;
  
  		gli::texture3D TextureE(TextureD, 1, 1);
  
  		Error += TextureE[0] == TextureD[1] ? 0 : 1;
  		Error += TextureE[0] == TextureA[2] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_viewCube
  (
  	std::vector<gli::format> const & Formats, 
  	gli::textureCube::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::textureCube TextureA(gli::textureCube::size_type(6), gli::levels(TextureSize), Formats[i], TextureSize);
  
  		gli::textureCube TextureViewA(TextureA,
  			TextureA.baseFace(), TextureA.maxFace(),
  			TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::textureCube::dim_type SizeB(TextureSize / gli::textureCube::dim_type(2));
  		gli::textureCube TextureB(gli::textureCube::size_type(6), gli::levels(SizeB), Formats[i], SizeB);
  
  		gli::textureCube TextureViewB(TextureA, TextureA.baseFace(), TextureA.maxFace(), TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::textureCube TextureViewD = gli::view(TextureA, TextureA.baseFace(), TextureA.maxFace(), TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewD == TextureViewB ? 0 : 1;
  
  		gli::textureCube TextureD(TextureA, 0, TextureA.faces() -1, 1, 3);
  
  		Error += TextureA[0][1] == TextureD[0][0] ? 0 : 1;
  		Error += TextureA[0][2] == TextureD[0][1] ? 0 : 1;
  
  		gli::textureCube TextureE(TextureD, 0, TextureD.faces() -1, 0, TextureD.levels() - 1);
  
  		Error += TextureE == TextureD ? 0 : 1;
  		Error += TextureE[0] == TextureD[0] ? 0 : 1;
  
  		gli::textureCube TextureF(TextureE, 1, 3, 0, TextureE.levels() - 1);
  
  		Error += TextureF[0] == TextureD[1] ? 0 : 1;
  		Error += TextureF[0] == TextureE[1] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int test_viewCubeArray
  (
  	std::vector<gli::format> const & Formats,
  	gli::textureCubeArray::dim_type const & TextureSize
  )
  {
  	int Error(0);
  
  	for(std::size_t i = 0; i < Formats.size(); ++i)
  	{
  		gli::textureCubeArray TextureA(
  			gli::textureCubeArray::size_type(4),
  			gli::textureCubeArray::size_type(6),
  			gli::levels(TextureSize),
  			Formats[i],
  			TextureSize);
  
  		gli::textureCubeArray TextureViewA(TextureA,
  			TextureA.baseLayer(), TextureA.maxLayer(),
  			TextureA.baseFace(), TextureA.maxFace(),
  			TextureA.baseLevel(), TextureA.maxLevel());
  
  		Error += TextureA == TextureViewA ? 0 : 1;
  
  		gli::textureCubeArray::dim_type SizeB(TextureSize / gli::textureCubeArray::dim_type(2));
  		gli::textureCubeArray TextureB(
  			gli::textureCubeArray::size_type(4),
  			gli::textureCubeArray::size_type(6),
  			gli::levels(SizeB),
  			Formats[i],
  			SizeB);
  
  		gli::textureCubeArray TextureViewB(TextureA,
  			TextureA.baseLayer(), TextureA.maxLayer(),
  			TextureA.baseFace(), TextureA.maxFace(),
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureB == TextureViewB ? 0 : 1;
  
  		gli::textureCubeArray TextureViewD(TextureA,
  			TextureA.baseLayer(), TextureA.maxLayer(),
  			TextureA.baseFace(), TextureA.maxFace(),
  			TextureA.baseLevel() + 1, TextureA.maxLevel());
  
  		Error += TextureViewD == TextureViewB ? 0 : 1;
  
  		gli::textureCubeArray TextureD(TextureA, 0, TextureA.layers() -1, 0, TextureA.faces() -1, 1, 3);
  
  		Error += TextureA[0][0][1] == TextureD[0][0][0] ? 0 : 1;
  		Error += TextureA[0][0][2] == TextureD[0][0][1] ? 0 : 1;
  
  		gli::textureCubeArray TextureE(TextureD, 0, TextureA.layers() -1, 0, TextureD.faces() -1, 0, TextureD.levels() - 1);
  
  		Error += TextureE == TextureD ? 0 : 1;
  		Error += TextureE[0] == TextureD[0] ? 0 : 1;
  		Error += TextureE[1] == TextureD[1] ? 0 : 1;
  
  		gli::textureCubeArray TextureF(TextureE, 0, TextureA.layers() -1, 1, 3, 0, TextureE.levels() - 1);
  
  		Error += TextureF[0][0] == TextureD[0][1] ? 0 : 1;
  		Error += TextureF[1][0] == TextureD[1][1] ? 0 : 1;
  		Error += TextureF[0][0] == TextureE[0][1] ? 0 : 1;
  		Error += TextureF[1][0] == TextureE[1][1] ? 0 : 1;
  	}
  
  	return Error;
  }
  
  int main()
  {
  	int Error(0);
  
  	std::vector<gli::format> Formats;
  	Formats.push_back(gli::RGBA8_UNORM);
  	Formats.push_back(gli::RGB8_UNORM);
  	Formats.push_back(gli::R8_SNORM);
  	Formats.push_back(gli::RGB_DXT1);
  	Formats.push_back(gli::RGB_BP_UNORM);
  	Formats.push_back(gli::RGBA32F);
  	std::size_t const TextureSize(32);
  
  	Error += test_view1D(Formats, gli::texture1D::dim_type(TextureSize));
  	Error += test_view1DArray(Formats, gli::texture1DArray::dim_type(TextureSize));
  	Error += test_view2D(Formats, gli::texture2D::dim_type(TextureSize));
  	Error += test_view2DArray(Formats, gli::texture2DArray::dim_type(TextureSize));
  	Error += test_view3D(Formats, gli::texture3D::dim_type(TextureSize));
  	Error += test_viewCube(Formats, gli::textureCube::dim_type(TextureSize));
  	Error += test_viewCubeArray(Formats, gli::textureCube::dim_type(TextureSize));
  
  	return Error;
  }
  