text: /*
      This file is part of Magnum.
  
      Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
                Vladimír Vondruš <mosra@centrum.cz>
  
      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.
  */
  
  #include <Corrade/TestSuite/Compare/Container.h>
  
  #include "Magnum/Image.h"
  #include "Magnum/GL/Context.h"
  #include "Magnum/GL/Extensions.h"
  #ifndef MAGNUM_TARGET_GLES2
  #include "Magnum/GL/BufferImage.h"
  #endif
  #include "Magnum/GL/CubeMapTexture.h"
  #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
  #include "Magnum/GL/ImageFormat.h"
  #endif
  #include "Magnum/GL/OpenGLTester.h"
  #include "Magnum/GL/PixelFormat.h"
  #include "Magnum/GL/TextureFormat.h"
  #include "Magnum/Math/Color.h"
  #include "Magnum/Math/Range.h"
  
  namespace Magnum { namespace GL { namespace Test { namespace {
  
  struct CubeMapTextureGLTest: OpenGLTester {
      explicit CubeMapTextureGLTest();
  
      void construct();
      void wrap();
  
      void bind();
      #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
      void bindImage();
      #endif
  
      template<class T> void sampling();
      #ifndef MAGNUM_TARGET_WEBGL
      void samplingSrgbDecode();
      #endif
      #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
      void samplingSwizzle();
      #elif !defined(MAGNUM_TARGET_WEBGL)
      void samplingMaxLevel();
      void samplingCompare();
      #endif
      #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
      void samplingBorderInteger();
      void samplingDepthStencilMode();
      #endif
      #if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_WEBGL)
      void samplingBorder();
      #endif
  
      void storage();
  
      void image();
      #ifndef MAGNUM_TARGET_GLES2
      void imageBuffer();
      #endif
      void subImage();
      #ifndef MAGNUM_TARGET_GLES2
      void subImageBuffer();
      #endif
      #ifndef MAGNUM_TARGET_GLES
      void subImageQuery();
      void subImageQueryBuffer();
      #endif
  
      void compressedImage();
      #ifndef MAGNUM_TARGET_GLES2
      void compressedImageBuffer();
      #endif
      #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
      void immutableCompressedImage();
      #endif
      void compressedSubImage();
      #ifndef MAGNUM_TARGET_GLES2
      void compressedSubImageBuffer();
      #endif
      #ifndef MAGNUM_TARGET_GLES
      void compressedSubImageQuery();
      void compressedSubImageQueryBuffer();
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      void fullImageQuery();
      void fullImageQueryBuffer();
  
      void compressedFullImageQuery();
      void compressedFullImageQueryBuffer();
      #endif
  
      void generateMipmap();
  
      void invalidateImage();
      void invalidateSubImage();
  };
  
  struct GenericSampler {
      typedef Magnum::SamplerFilter Filter;
      typedef Magnum::SamplerMipmap Mipmap;
      typedef Magnum::SamplerWrapping Wrapping;
  };
  struct GLSampler {
      typedef GL::SamplerFilter Filter;
      typedef GL::SamplerMipmap Mipmap;
      typedef GL::SamplerWrapping Wrapping;
  };
  
  constexpr UnsignedByte Data[]{
      0, 0, 0, 0, 0, 0, 0, 0,
      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
  
  enum: std::size_t { PixelStorageDataCount =
      #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
      2
      #else
      1
      #endif
  };
  
  const struct {
      const char* name;
      Containers::ArrayView<const UnsignedByte> data;
      PixelStorage storage;
      Containers::ArrayView<const UnsignedByte> dataSparse;
      std::size_t offset;
  } PixelStorageData[PixelStorageDataCount]{
      {"default pixel storage",
          Containers::arrayView(Data).suffix(8), {},
          Containers::arrayView(Data).suffix(8), 0},
      #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
      {"skip Y",
          Containers::arrayView(Data).suffix(8), PixelStorage{}.setSkip({0, 1, 0}),
          Containers::arrayView(Data), 8}
      #endif
  };
  
  /* Just 4x4 0x00 - 0x3f compressed using RGBA DXT3 by the driver */
  constexpr UnsignedByte CompressedData[]{
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2
  };
  
  enum: std::size_t { CompressedPixelStorageDataCount =
      #ifndef MAGNUM_TARGET_GLES
      2
      #else
      1
      #endif
  };
  
  const struct {
      const char* name;
      Containers::ArrayView<const UnsignedByte> data;
      #ifndef MAGNUM_TARGET_GLES
      CompressedPixelStorage storage;
      #endif
      Containers::ArrayView<const UnsignedByte> dataSparse;
      std::size_t offset;
  } CompressedPixelStorageData[CompressedPixelStorageDataCount]{
      {"default pixel storage",
          Containers::arrayView(CompressedData).suffix(16),
          #ifndef MAGNUM_TARGET_GLES
          {},
          #endif
          Containers::arrayView(CompressedData).suffix(16), 0},
      #ifndef MAGNUM_TARGET_GLES
      {"skip Y",
          Containers::arrayView(CompressedData).suffix(16),
          CompressedPixelStorage{}
              .setCompressedBlockSize({4, 4, 1})
              .setCompressedBlockDataSize(16)
              .setSkip({0, 4, 0}),
          Containers::arrayView(CompressedData), 16}
      #endif
  };
  
  #ifndef MAGNUM_TARGET_GLES
  constexpr UnsignedByte FullData[]{
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  
      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  
      0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
      0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
  
      0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
      0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
  
      0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
      0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
  
      0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
      0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
  
      0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
      0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f
  };
  
  enum: std::size_t { FullPixelStorageDataCount = 2 };
  
  const struct {
      const char* name;
      Containers::ArrayView<const UnsignedByte> data;
      PixelStorage storage;
      std::size_t offset;
  } FullPixelStorageData[FullPixelStorageDataCount]{
      {"default pixel storage",
          Containers::arrayView(FullData).suffix(16), {}, 0},
      #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
      {"skip Z",
          Containers::arrayView(FullData).suffix(16), PixelStorage{}.setSkip({0, 0, 1}), 16}
      #endif
  };
  
  /* Just 4x4 0x00 - 0x3f compressed using RGBA DXT3 by the driver, repeated
     six times */
  constexpr UnsignedByte CompressedFullData[]{
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2,
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2,
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2,
  
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2,
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2,
        0,  17, 17,  34,  34,  51,  51,  67,
      232,  57,  0,   0, 213, 255, 170,   2
  };
  
  enum: std::size_t { CompressedFullPixelStorageDataCount =
      #ifndef MAGNUM_TARGET_GLES
      2
      #else
      1
      #endif
  };
  
  const struct {
      const char* name;
      Containers::ArrayView<const UnsignedByte> data;
      #ifndef MAGNUM_TARGET_GLES
      CompressedPixelStorage storage;
      #endif
      std::size_t offset;
  } CompressedFullPixelStorageData[CompressedFullPixelStorageDataCount]{
      {"default pixel storage",
          Containers::arrayView(CompressedFullData).suffix(16*4),
          #ifndef MAGNUM_TARGET_GLES
          {},
          #endif
          0},
      #ifndef MAGNUM_TARGET_GLES
      {"skip Z",
          Containers::arrayView(CompressedFullData).suffix(16*4),
          CompressedPixelStorage{}
              .setCompressedBlockSize({4, 4, 1})
              .setCompressedBlockDataSize(16)
              .setSkip({0, 0, 4}), 16*4}
      #endif
  };
  #endif
  
  CubeMapTextureGLTest::CubeMapTextureGLTest() {
      addTests({&CubeMapTextureGLTest::construct,
                &CubeMapTextureGLTest::wrap,
  
                &CubeMapTextureGLTest::bind,
                #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
                &CubeMapTextureGLTest::bindImage,
                #endif
  
                &CubeMapTextureGLTest::sampling<GenericSampler>,
                &CubeMapTextureGLTest::sampling<GLSampler>,
                #ifndef MAGNUM_TARGET_WEBGL
                &CubeMapTextureGLTest::samplingSrgbDecode,
                #endif
                #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
                &CubeMapTextureGLTest::samplingSwizzle,
                #elif !defined(MAGNUM_TARGET_WEBGL)
                &CubeMapTextureGLTest::samplingMaxLevel,
                &CubeMapTextureGLTest::samplingCompare,
                #endif
                #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
                &CubeMapTextureGLTest::samplingBorderInteger,
                &CubeMapTextureGLTest::samplingDepthStencilMode,
                #endif
                #if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_WEBGL)
                &CubeMapTextureGLTest::samplingBorder,
                #endif
  
                &CubeMapTextureGLTest::storage});
  
      addInstancedTests({
          &CubeMapTextureGLTest::image,
          #ifndef MAGNUM_TARGET_GLES2
          &CubeMapTextureGLTest::imageBuffer,
          #endif
          #ifndef MAGNUM_TARGET_GLES
          &CubeMapTextureGLTest::fullImageQuery,
          &CubeMapTextureGLTest::fullImageQueryBuffer,
          #endif
          &CubeMapTextureGLTest::subImage,
          #ifndef MAGNUM_TARGET_GLES2
          &CubeMapTextureGLTest::subImageBuffer,
          #endif
          #ifndef MAGNUM_TARGET_GLES
          &CubeMapTextureGLTest::subImageQuery,
          &CubeMapTextureGLTest::subImageQueryBuffer
          #endif
          }, PixelStorageDataCount);
  
      addInstancedTests({
          &CubeMapTextureGLTest::compressedImage,
          #ifndef MAGNUM_TARGET_GLES2
          &CubeMapTextureGLTest::compressedImageBuffer,
          #endif
          #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
          &CubeMapTextureGLTest::immutableCompressedImage,
          #endif
          #ifndef MAGNUM_TARGET_GLES
          &CubeMapTextureGLTest::compressedFullImageQuery,
          &CubeMapTextureGLTest::compressedFullImageQueryBuffer,
          #endif
          &CubeMapTextureGLTest::compressedSubImage,
          #ifndef MAGNUM_TARGET_GLES2
          &CubeMapTextureGLTest::compressedSubImageBuffer,
          #endif
          #ifndef MAGNUM_TARGET_GLES
          &CubeMapTextureGLTest::compressedSubImageQuery,
          &CubeMapTextureGLTest::compressedSubImageQueryBuffer
          #endif
          }, CompressedPixelStorageDataCount);
  
      addTests({&CubeMapTextureGLTest::generateMipmap,
  
                &CubeMapTextureGLTest::invalidateImage,
                &CubeMapTextureGLTest::invalidateSubImage});
  }
  
  template<std::size_t size, class T> Containers::ArrayView<const T> unsafeSuffix(const T(&data)[size], std::size_t offset) {
      static_assert(sizeof(T) == 1, "");
      return {data - offset, size + offset};
  }
  
  void CubeMapTextureGLTest::construct() {
      {
          CubeMapTexture texture;
  
          MAGNUM_VERIFY_NO_GL_ERROR();
          CORRADE_VERIFY(texture.id() > 0);
      }
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  void CubeMapTextureGLTest::wrap() {
      GLuint id;
      glGenTextures(1, &id);
  
      /* Releasing won't delete anything */
      {
          auto texture = CubeMapTexture::wrap(id, ObjectFlag::DeleteOnDestruction);
          CORRADE_COMPARE(texture.release(), id);
      }
  
      /* ...so we can wrap it again */
      CubeMapTexture::wrap(id);
      glDeleteTextures(1, &id);
  }
  
  void CubeMapTextureGLTest::bind() {
      CubeMapTexture texture;
      texture.bind(15);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      AbstractTexture::unbind(15);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      AbstractTexture::bind(7, {&texture, nullptr, &texture});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      AbstractTexture::unbind(7, 3);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
  void CubeMapTextureGLTest::bindImage() {
      #ifndef MAGNUM_TARGET_GLES
      if(!Context::current().isExtensionSupported<Extensions::ARB::shader_image_load_store>())
          CORRADE_SKIP(Extensions::ARB::shader_image_load_store::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isVersionSupported(Version::GLES310))
          CORRADE_SKIP("OpenGL ES 3.1 is not supported.");
      #endif
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::RGBA8, Vector2i{32})
          .bindImage(2, 0, CubeMapCoordinate::NegativeX, ImageAccess::ReadWrite, ImageFormat::RGBA8);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      texture.bindImageLayered(3, 0, ImageAccess::ReadWrite, ImageFormat::RGBA8);
  
      AbstractTexture::unbindImage(2);
      AbstractTexture::unbindImage(3);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      AbstractTexture::bindImages(1, {&texture, nullptr, &texture});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      AbstractTexture::unbindImages(1, 3);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
      #endif
  }
  #endif
  
  template<class T> void CubeMapTextureGLTest::sampling() {
      setTestCaseName(std::is_same<T, GenericSampler>::value ?
          "sampling<GenericSampler>" : "sampling<GLSampler>");
  
      CubeMapTexture texture;
      texture.setMinificationFilter(T::Filter::Linear, T::Mipmap::Linear)
             .setMagnificationFilter(T::Filter::Linear)
             #ifndef MAGNUM_TARGET_GLES2
             .setMinLod(-750.0f)
             .setMaxLod(750.0f)
             #ifndef MAGNUM_TARGET_GLES
             .setLodBias(0.5f) /* todo both types */
             #endif
             .setBaseLevel(1)
             .setMaxLevel(750)
             #endif
             #ifndef MAGNUM_TARGET_GLES
             .setWrapping(T::Wrapping::ClampToBorder)
             .setBorderColor(Color3(0.5f))
             #else
             .setWrapping(T::Wrapping::ClampToEdge)
             #endif
             .setMaxAnisotropy(Sampler::maxMaxAnisotropy())
              #ifndef MAGNUM_TARGET_GLES2
             .setCompareMode(SamplerCompareMode::CompareRefToTexture)
             .setCompareFunction(SamplerCompareFunction::GreaterOrEqual)
              #endif
             ;
  
     MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  #ifndef MAGNUM_TARGET_WEBGL
  void CubeMapTextureGLTest::samplingSrgbDecode() {
      #ifdef MAGNUM_TARGET_GLES2
      if(!Context::current().isExtensionSupported<Extensions::EXT::sRGB>())
          CORRADE_SKIP(Extensions::EXT::sRGB::string() + std::string(" is not supported."));
      #endif
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_sRGB_decode>())
          CORRADE_SKIP(Extensions::EXT::texture_sRGB_decode::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setSrgbDecode(false);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  #endif
  
  #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
  void CubeMapTextureGLTest::samplingSwizzle() {
      #ifndef MAGNUM_TARGET_GLES
      if(!Context::current().isExtensionSupported<Extensions::ARB::texture_swizzle>())
          CORRADE_SKIP(Extensions::ARB::texture_swizzle::string() + std::string(" is not supported."));
      #endif
  
      CubeMapTexture texture;
      texture.setSwizzle<'b', 'g', 'r', '0'>();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  #endif
  
  #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
  void CubeMapTextureGLTest::samplingMaxLevel() {
      if(!Context::current().isExtensionSupported<Extensions::APPLE::texture_max_level>())
          CORRADE_SKIP(Extensions::APPLE::texture_max_level::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setMaxLevel(750);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  void CubeMapTextureGLTest::samplingCompare() {
      if(!Context::current().isExtensionSupported<Extensions::EXT::shadow_samplers>() ||
         !Context::current().isExtensionSupported<Extensions::NV::shadow_samplers_cube>())
          CORRADE_SKIP(Extensions::NV::shadow_samplers_cube::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setCompareMode(SamplerCompareMode::CompareRefToTexture)
             .setCompareFunction(SamplerCompareFunction::GreaterOrEqual);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  #endif
  
  #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
  void CubeMapTextureGLTest::samplingBorderInteger() {
      #ifndef MAGNUM_TARGET_GLES
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_integer>())
          CORRADE_SKIP(Extensions::EXT::texture_integer::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_border_clamp>())
          CORRADE_SKIP(Extensions::EXT::texture_border_clamp::string() + std::string(" is not supported."));
      #endif
  
      CubeMapTexture a;
      a.setWrapping(SamplerWrapping::ClampToBorder)
       .setBorderColor(Vector4i(1, 56, 78, -2));
      CubeMapTexture b;
      b.setWrapping(SamplerWrapping::ClampToBorder)
       .setBorderColor(Vector4ui(35, 56, 78, 15));
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  void CubeMapTextureGLTest::samplingDepthStencilMode() {
      #ifndef MAGNUM_TARGET_GLES
      if(!Context::current().isExtensionSupported<Extensions::ARB::stencil_texturing>())
          CORRADE_SKIP(Extensions::ARB::stencil_texturing::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isVersionSupported(Version::GLES310))
          CORRADE_SKIP("OpenGL ES 3.1 not supported.");
      #endif
  
      CubeMapTexture texture;
      texture.setDepthStencilMode(SamplerDepthStencilMode::StencilIndex);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  #endif
  
  #if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_WEBGL)
  void CubeMapTextureGLTest::samplingBorder() {
      if(!Context::current().isExtensionSupported<Extensions::NV::texture_border_clamp>() &&
         !Context::current().isExtensionSupported<Extensions::EXT::texture_border_clamp>())
          CORRADE_SKIP("No required extension is supported.");
  
      CubeMapTexture texture;
      texture.setWrapping(SamplerWrapping::ClampToBorder)
             .setBorderColor(Color3(0.5f));
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  #endif
  
  void CubeMapTextureGLTest::storage() {
      CubeMapTexture texture;
      texture.setStorage(5,
          #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
          TextureFormat::RGBA8,
          #else
          TextureFormat::RGBA,
          #endif
          Vector2i(32));
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
      #ifdef MAGNUM_TARGET_GLES
      if(!Context::current().isVersionSupported(Version::GLES310))
          CORRADE_SKIP("OpenGL ES 3.1 not supported, skipping image size testing");
      #endif
  
      CORRADE_COMPARE(texture.imageSize(0), Vector2i(32));
      CORRADE_COMPARE(texture.imageSize(1), Vector2i(16));
      CORRADE_COMPARE(texture.imageSize(2), Vector2i(8));
      CORRADE_COMPARE(texture.imageSize(3), Vector2i(4));
      CORRADE_COMPARE(texture.imageSize(4), Vector2i(2));
      /* Not available */
      CORRADE_COMPARE(texture.imageSize(5), Vector2i(0));
  
      MAGNUM_VERIFY_NO_GL_ERROR();
      #endif
  }
  
  constexpr UnsignedByte Zero[4*4*4]{};
  
  void CubeMapTextureGLTest::image() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      #ifdef MAGNUM_TARGET_GLES2
      #ifndef MAGNUM_TARGET_WEBGL
      if(PixelStorageData[testCaseInstanceId()].storage != PixelStorage{} && !Context::current().isExtensionSupported<Extensions::EXT::unpack_subimage>())
          CORRADE_SKIP(Extensions::EXT::unpack_subimage::string() + std::string(" is not supported."));
      #else
      if(PixelStorageData[testCaseInstanceId()].storage != PixelStorage{})
          CORRADE_SKIP("Image unpack is not supported in WebGL 1.");
      #endif
      #endif
  
      #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
      constexpr TextureFormat format = TextureFormat::RGBA8;
      #else
      constexpr TextureFormat format = TextureFormat::RGBA;
      #endif
  
      CubeMapTexture texture;
      texture.setImage(CubeMapCoordinate::PositiveX, 0, format, ImageView2D{PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2),
          PixelStorageData[testCaseInstanceId()].dataSparse});
      texture.setImage(CubeMapCoordinate::NegativeX, 0, format,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::PositiveY, 0, format,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::NegativeY, 0, format,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::PositiveZ, 0, format,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::NegativeZ, 0, format,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      Image2D image = texture.image(CubeMapCoordinate::PositiveX, 0,
          {PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i(2));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(PixelStorageData[testCaseInstanceId()].offset),
          PixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
      #endif
  }
  
  #ifndef MAGNUM_TARGET_GLES2
  void CubeMapTextureGLTest::imageBuffer() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      CubeMapTexture texture;
      texture.setImage(CubeMapCoordinate::PositiveX, 0, TextureFormat::RGBA8,
          BufferImage2D{PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2),
          PixelStorageData[testCaseInstanceId()].dataSparse,
          BufferUsage::StaticDraw});
      texture.setImage(CubeMapCoordinate::NegativeX, 0, TextureFormat::RGBA8,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::PositiveY, 0, TextureFormat::RGBA8,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::NegativeY, 0, TextureFormat::RGBA8,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::PositiveZ, 0, TextureFormat::RGBA8,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
      texture.setImage(CubeMapCoordinate::NegativeZ, 0, TextureFormat::RGBA8,
          ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      BufferImage2D image = texture.image(CubeMapCoordinate::PositiveX, 0,
          {PixelStorageData[testCaseInstanceId()].storage, PixelFormat::RGBA, PixelType::UnsignedByte}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i(2));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData).suffix(PixelStorageData[testCaseInstanceId()].offset),
          PixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
      #endif
  }
  #endif
  
  #ifndef MAGNUM_TARGET_GLES
  constexpr UnsignedByte SubDataComplete[]{
      0, 0, 0, 0,    0,    0,    0,    0,    0,    0,    0,    0, 0, 0, 0, 0,
      0, 0, 0, 0, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0, 0, 0, 0,
      0, 0, 0, 0, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0, 0, 0, 0,
      0, 0, 0, 0,    0,    0,    0,    0,    0,    0,    0,    0, 0, 0, 0, 0
  };
  #endif
  
  void CubeMapTextureGLTest::subImage() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      #ifdef MAGNUM_TARGET_GLES2
      #ifndef MAGNUM_TARGET_WEBGL
      if(PixelStorageData[testCaseInstanceId()].storage != PixelStorage{} && !Context::current().isExtensionSupported<Extensions::EXT::unpack_subimage>())
          CORRADE_SKIP(Extensions::EXT::unpack_subimage::string() + std::string(" is not supported."));
      #else
      if(PixelStorageData[testCaseInstanceId()].storage != PixelStorage{})
          CORRADE_SKIP("Image unpack is not supported in WebGL 1.");
      #endif
      #endif
  
      #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
      constexpr TextureFormat format = TextureFormat::RGBA8;
      #else
      constexpr TextureFormat format = TextureFormat::RGBA;
      #endif
  
      CubeMapTexture texture;
      texture.setImage(CubeMapCoordinate::PositiveX, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeX, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::PositiveY, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeY, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::PositiveZ, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeZ, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setSubImage(CubeMapCoordinate::PositiveX, 0, Vector2i(1), ImageView2D{
          PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2),
          PixelStorageData[testCaseInstanceId()].dataSparse});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      Image2D image = texture.image(CubeMapCoordinate::PositiveX, 0, {PixelFormat::RGBA, PixelType::UnsignedByte});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i(4));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()),
          Containers::arrayView(SubDataComplete), TestSuite::Compare::Container);
      #endif
  }
  
  #ifndef MAGNUM_TARGET_GLES2
  void CubeMapTextureGLTest::subImageBuffer() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      CubeMapTexture texture;
      texture.setImage(CubeMapCoordinate::PositiveX, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeX, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::PositiveY, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeY, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::PositiveZ, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setImage(CubeMapCoordinate::NegativeZ, 0, TextureFormat::RGBA8,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(4), Zero));
      texture.setSubImage(CubeMapCoordinate::PositiveX, 0, Vector2i(1), BufferImage2D{
          PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2),
          PixelStorageData[testCaseInstanceId()].dataSparse,
          BufferUsage::StaticDraw});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      BufferImage2D image = texture.image(CubeMapCoordinate::PositiveX, 0, {PixelFormat::RGBA, PixelType::UnsignedByte}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i(4));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData),
          Containers::arrayView(SubDataComplete),
          TestSuite::Compare::Container);
      #endif
  }
  #endif
  
  #ifndef MAGNUM_TARGET_GLES
  void CubeMapTextureGLTest::subImageQuery() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::get_texture_sub_image>())
          CORRADE_SKIP(Extensions::ARB::get_texture_sub_image::string() + std::string(" is not supported."));
      /* I'm too lazy to call setSubImage() six times */
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
             .setSubImage(0, {}, ImageView3D{PixelFormat::RGBA, PixelType::UnsignedByte, {4, 4, 1}, SubDataComplete});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      Image3D image = texture.subImage(0, Range3Di::fromSize({1, 1, 0}, {2, 2, 1}),
          {PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector3i(2, 2, 1));
      CORRADE_COMPARE_AS(Containers::arrayCast<const UnsignedByte>(image.data()).suffix(PixelStorageData[testCaseInstanceId()].offset),
          PixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
  }
  
  void CubeMapTextureGLTest::subImageQueryBuffer() {
      setTestCaseDescription(PixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::get_texture_sub_image>())
          CORRADE_SKIP(Extensions::ARB::get_texture_sub_image::string() + std::string(" is not supported."));
      /* I'm too lazy to call setSubImage() six times */
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
             .setSubImage(0, {}, ImageView3D{PixelFormat::RGBA, PixelType::UnsignedByte, {4, 4, 1}, SubDataComplete});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      BufferImage3D image = texture.subImage(0, Range3Di::fromSize({1, 1, 0}, {2, 2, 1}),
          {PixelStorageData[testCaseInstanceId()].storage,
          PixelFormat::RGBA, PixelType::UnsignedByte}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector3i(2, 2, 1));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData).suffix(PixelStorageData[testCaseInstanceId()].offset),
          PixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
  }
  #endif
  
  void CubeMapTextureGLTest::compressedImage() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      #ifndef MAGNUM_TARGET_WEBGL
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::WEBGL::compressed_texture_s3tc>())
          CORRADE_SKIP(Extensions::WEBGL::compressed_texture_s3tc::string() + std::string(" is not supported."));
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      #endif
  
      const CompressedImageView2D view{
          #ifndef MAGNUM_TARGET_GLES
          CompressedPixelStorageData[testCaseInstanceId()].storage,
          #endif
          CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{4},
          CompressedPixelStorageData[testCaseInstanceId()].dataSparse};
  
      CubeMapTexture texture;
      texture.setCompressedImage(CubeMapCoordinate::PositiveX, 0, view)
             .setCompressedImage(CubeMapCoordinate::NegativeX, 0, view)
             .setCompressedImage(CubeMapCoordinate::PositiveY, 0, view)
             .setCompressedImage(CubeMapCoordinate::NegativeY, 0, view)
             .setCompressedImage(CubeMapCoordinate::PositiveZ, 0, view)
             .setCompressedImage(CubeMapCoordinate::NegativeZ, 0, view);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      CompressedImage2D image = texture.compressedImage(CubeMapCoordinate::PositiveX, 0, {CompressedPixelStorageData[testCaseInstanceId()].storage});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i{4});
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(CompressedPixelStorageData[testCaseInstanceId()].offset),
          CompressedPixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
      #endif
  }
  
  #ifndef MAGNUM_TARGET_GLES2
  void CubeMapTextureGLTest::compressedImageBuffer() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      #ifndef MAGNUM_TARGET_WEBGL
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::WEBGL::compressed_texture_s3tc>())
          CORRADE_SKIP(Extensions::WEBGL::compressed_texture_s3tc::string() + std::string(" is not supported."));
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      #endif
  
      CompressedBufferImage2D buffer{
          #ifndef MAGNUM_TARGET_GLES
          CompressedPixelStorageData[testCaseInstanceId()].storage,
          #endif
          CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{4},
          CompressedPixelStorageData[testCaseInstanceId()].dataSparse,
          BufferUsage::StaticDraw};
  
      CubeMapTexture texture;
      texture.setCompressedImage(CubeMapCoordinate::PositiveX, 0, buffer)
             .setCompressedImage(CubeMapCoordinate::NegativeX, 0, buffer)
             .setCompressedImage(CubeMapCoordinate::PositiveY, 0, buffer)
             .setCompressedImage(CubeMapCoordinate::NegativeY, 0, buffer)
             .setCompressedImage(CubeMapCoordinate::PositiveZ, 0, buffer)
             .setCompressedImage(CubeMapCoordinate::NegativeZ, 0, buffer);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      CompressedBufferImage2D image = texture.compressedImage(CubeMapCoordinate::PositiveX, 0,
          {CompressedPixelStorageData[testCaseInstanceId()].storage}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i{4});
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData).suffix(CompressedPixelStorageData[testCaseInstanceId()].offset),
          CompressedPixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
      #endif
  }
  #endif
  
  #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
  void CubeMapTextureGLTest::immutableCompressedImage() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      #ifndef MAGNUM_TARGET_GLES
      if(!Context::current().isExtensionSupported<Extensions::ARB::texture_storage>())
          CORRADE_SKIP(Extensions::ARB::texture_storage::string() + std::string(" is not supported."));
      #elif defined(MAGNUM_TARGET_GLES2)
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_storage>())
          CORRADE_SKIP(Extensions::EXT::texture_storage::string() + std::string(" is not supported."));
      #endif
      #ifndef MAGNUM_TARGET_WEBGL
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::WEBGL::compressed_texture_s3tc>())
          CORRADE_SKIP(Extensions::WEBGL::compressed_texture_s3tc::string() + std::string(" is not supported."));
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      #endif
  
      /* Testing that GL_TEXTURE_COMPRESSED_IMAGE_SIZE is consistent and returns
         the same value regardless whether the texture is immutable or not. (Not
         the case, at least on NVidia 358.16, compare with compressedImage() test
         case that just calls setImage() six times instead of setStorage() and
         gets value that's six times smaller. I couldn't find anything in the
         specs so I suspect it's a bug). */
  
      const CompressedImageView2D view{
          #ifndef MAGNUM_TARGET_GLES
          CompressedPixelStorageData[testCaseInstanceId()].storage,
          #endif
          CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{4},
          CompressedPixelStorageData[testCaseInstanceId()].dataSparse};
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::CompressedRGBAS3tcDxt3, Vector2i{4})
             .setCompressedSubImage(CubeMapCoordinate::PositiveX, 0, {}, view)
             .setCompressedSubImage(CubeMapCoordinate::NegativeX, 0, {}, view)
             .setCompressedSubImage(CubeMapCoordinate::PositiveY, 0, {}, view)
             .setCompressedSubImage(CubeMapCoordinate::NegativeY, 0, {}, view)
             .setCompressedSubImage(CubeMapCoordinate::PositiveZ, 0, {}, view)
             .setCompressedSubImage(CubeMapCoordinate::NegativeZ, 0, {}, view);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      CompressedImage2D image = texture.compressedImage(CubeMapCoordinate::NegativeY, 0, {CompressedPixelStorageData[testCaseInstanceId()].storage});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i{4});
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(CompressedPixelStorageData[testCaseInstanceId()].offset),
          CompressedPixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
      #endif
  }
  #endif
  
  /* Just 12x12 zeros compressed using RGBA DXT3 by the driver */
  constexpr UnsignedByte CompressedZero[9*16]{};
  
  #ifndef MAGNUM_TARGET_GLES
  /* Combination of CompressedZero and CompressedData */
  constexpr UnsignedByte CompressedSubDataComplete[]{
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
  
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,  17,  17,  34,  34,  51,  51,  67,
      232,  57,   0,   0, 213, 255, 170,   2,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
  
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0
  };
  #endif
  
  void CubeMapTextureGLTest::compressedSubImage() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      #ifndef MAGNUM_TARGET_WEBGL
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::WEBGL::compressed_texture_s3tc>())
          CORRADE_SKIP(Extensions::WEBGL::compressed_texture_s3tc::string() + std::string(" is not supported."));
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      #endif
  
      CubeMapTexture texture;
      texture.setCompressedImage(CubeMapCoordinate::PositiveX, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeX, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::PositiveY, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeY, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::PositiveZ, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeZ, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedSubImage(CubeMapCoordinate::PositiveX, 0, Vector2i{4}, CompressedImageView2D{
          #ifndef MAGNUM_TARGET_GLES
          CompressedPixelStorageData[testCaseInstanceId()].storage,
          #endif
          CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{4},
          CompressedPixelStorageData[testCaseInstanceId()].dataSparse});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      CompressedImage2D image = texture.compressedImage(CubeMapCoordinate::PositiveX, 0, {});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i{12});
  
      {
          CORRADE_EXPECT_FAIL_IF(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>() && (Context::current().detectedDriver() & Context::DetectedDriver::NVidia),
              "Non-default compressed pixel storage for cube map textures behaves weirdly on NVidia for client-memory images when using ARB_direct_state_access");
  
          CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()),
              Containers::arrayView(CompressedSubDataComplete),
              TestSuite::Compare::Container);
      }
      #endif
  }
  
  #ifndef MAGNUM_TARGET_GLES2
  void CubeMapTextureGLTest::compressedSubImageBuffer() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      #ifndef MAGNUM_TARGET_WEBGL
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      #else
      if(!Context::current().isExtensionSupported<Extensions::WEBGL::compressed_texture_s3tc>())
          CORRADE_SKIP(Extensions::WEBGL::compressed_texture_s3tc::string() + std::string(" is not supported."));
      #endif
  
      #ifndef MAGNUM_TARGET_GLES
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      #endif
  
      CubeMapTexture texture;
      texture.setCompressedImage(CubeMapCoordinate::PositiveX, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeX, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::PositiveY, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeY, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::PositiveZ, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedImage(CubeMapCoordinate::NegativeZ, 0,
          CompressedImageView2D{CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{12}, CompressedZero});
      texture.setCompressedSubImage(CubeMapCoordinate::PositiveX, 0, Vector2i{4}, CompressedBufferImage2D{
          #ifndef MAGNUM_TARGET_GLES
          CompressedPixelStorageData[testCaseInstanceId()].storage,
          #endif
          CompressedPixelFormat::RGBAS3tcDxt3, Vector2i{4},
          CompressedPixelStorageData[testCaseInstanceId()].dataSparse,
          BufferUsage::StaticDraw});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      #ifndef MAGNUM_TARGET_GLES
      CompressedBufferImage2D image = texture.compressedImage(CubeMapCoordinate::PositiveX, 0,
          {}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector2i{12});
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData),
          Containers::arrayView(CompressedSubDataComplete),
          TestSuite::Compare::Container);
      #endif
  }
  #endif
  
  #ifndef MAGNUM_TARGET_GLES
  void CubeMapTextureGLTest::compressedSubImageQuery() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::get_texture_sub_image>())
          CORRADE_SKIP(Extensions::ARB::get_texture_sub_image::string() + std::string(" is not supported."));
      /* I'm too lazy to call setSubImage() six times */
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage == CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::internalformat_query2>())
          CORRADE_SKIP(Extensions::ARB::internalformat_query2::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::CompressedRGBAS3tcDxt3, Vector2i{12})
          .setCompressedSubImage(0, {}, CompressedImageView3D{CompressedPixelFormat::RGBAS3tcDxt3, {12, 12, 1}, CompressedSubDataComplete});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CompressedImage3D image = texture.compressedSubImage(0, Range3Di::fromSize({4, 4, 0}, {4, 4, 1}), {CompressedPixelStorageData[testCaseInstanceId()].storage});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), (Vector3i{4, 4, 1}));
      CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(CompressedPixelStorageData[testCaseInstanceId()].offset),
          CompressedPixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
  }
  
  void CubeMapTextureGLTest::compressedSubImageQueryBuffer() {
      setTestCaseDescription(CompressedPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::get_texture_sub_image>())
          CORRADE_SKIP(Extensions::ARB::get_texture_sub_image::string() + std::string(" is not supported."));
      /* I'm too lazy to call setSubImage() six times */
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage == CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::internalformat_query2>())
          CORRADE_SKIP(Extensions::ARB::internalformat_query2::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::CompressedRGBAS3tcDxt3, Vector2i{12})
             .setCompressedSubImage(0, {}, CompressedImageView3D{CompressedPixelFormat::RGBAS3tcDxt3, {12, 12, 1}, CompressedSubDataComplete});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CompressedBufferImage3D image = texture.compressedSubImage(0, Range3Di::fromSize({4, 4, 0}, {4, 4, 1}), {CompressedPixelStorageData[testCaseInstanceId()].storage}, BufferUsage::StaticRead);
      const auto imageData = image.buffer().data();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), (Vector3i{4, 4, 1}));
      CORRADE_COMPARE_AS(
          Containers::arrayCast<UnsignedByte>(imageData).suffix(CompressedPixelStorageData[testCaseInstanceId()].offset),
          CompressedPixelStorageData[testCaseInstanceId()].data,
          TestSuite::Compare::Container);
  }
  #endif
  
  #ifndef MAGNUM_TARGET_GLES
  void CubeMapTextureGLTest::fullImageQuery() {
      setTestCaseDescription(FullPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::RGBA8, Vector2i{2, 2})
          .setSubImage(0, {}, ImageView3D{
              PixelFormat::RGBA, PixelType::UnsignedByte, {2, 2, 6},
              FullPixelStorageData[testCaseInstanceId()].data});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      Image3D image = texture.image(0,
          {FullPixelStorageData[testCaseInstanceId()].storage, PixelFormat::RGBA, PixelType::UnsignedByte});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector3i(2, 2, 6));
      {
          CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::Mesa) && FullPixelStorageData[testCaseInstanceId()].storage != PixelStorage{},
              "Mesa drivers can't handle non-default pixel storage for full cubemap image queries.");
          CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(FullPixelStorageData[testCaseInstanceId()].offset),
              FullPixelStorageData[testCaseInstanceId()].data,
              TestSuite::Compare::Container);
      }
  }
  
  void CubeMapTextureGLTest::fullImageQueryBuffer() {
      setTestCaseDescription(FullPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::RGBA8, Vector2i{2})
          .setSubImage(0, {}, BufferImage3D{
              PixelFormat::RGBA, PixelType::UnsignedByte, {2, 2, 6},
              FullPixelStorageData[testCaseInstanceId()].data,
              BufferUsage::StaticDraw});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      BufferImage3D image = texture.image(0,
          {FullPixelStorageData[testCaseInstanceId()].storage, PixelFormat::RGBA,
              PixelType::UnsignedByte}, BufferUsage::StaticRead);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), Vector3i(2, 2, 6));
      const auto imageData = image.buffer().data();
      {
          CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::Mesa) && FullPixelStorageData[testCaseInstanceId()].storage != PixelStorage{},
              "Mesa drivers can't handle non-default pixel storage for full cubemap image queries.");
          CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData).suffix(FullPixelStorageData[testCaseInstanceId()].offset),
              FullPixelStorageData[testCaseInstanceId()].data, TestSuite::Compare::Container);
      }
  }
  
  void CubeMapTextureGLTest::compressedFullImageQuery() {
      setTestCaseDescription(CompressedFullPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::CompressedRGBAS3tcDxt3, Vector2i{4})
          .setCompressedSubImage(0, {}, CompressedImageView3D{
              CompressedPixelFormat::RGBAS3tcDxt3, {4, 4, 6},
              CompressedFullPixelStorageData[testCaseInstanceId()].data});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CompressedImage3D image = texture.compressedImage(0, {CompressedFullPixelStorageData[testCaseInstanceId()].storage});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), (Vector3i{4, 4, 6}));
      {
          CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::Mesa) && CompressedFullPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{},
              "Mesa drivers can't handle non-default pixel storage for full cubemap image queries.");
          CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(image.data()).suffix(CompressedFullPixelStorageData[testCaseInstanceId()].offset),
              CompressedFullPixelStorageData[testCaseInstanceId()].data,
              TestSuite::Compare::Container);
      }
  }
  
  void CubeMapTextureGLTest::compressedFullImageQueryBuffer() {
      setTestCaseDescription(CompressedFullPixelStorageData[testCaseInstanceId()].name);
  
      if(!Context::current().isExtensionSupported<Extensions::ARB::direct_state_access>())
          CORRADE_SKIP(Extensions::ARB::direct_state_access::string() + std::string(" is not supported."));
      if(!Context::current().isExtensionSupported<Extensions::EXT::texture_compression_s3tc>())
          CORRADE_SKIP(Extensions::EXT::texture_compression_s3tc::string() + std::string(" is not supported."));
      if(CompressedPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{} && !Context::current().isExtensionSupported<Extensions::ARB::compressed_texture_pixel_storage>())
          CORRADE_SKIP(Extensions::ARB::compressed_texture_pixel_storage::string() + std::string(" is not supported."));
  
      CubeMapTexture texture;
      texture.setStorage(1, TextureFormat::CompressedRGBAS3tcDxt3, Vector2i{4})
          .setCompressedSubImage(0, {}, CompressedBufferImage3D{
              CompressedPixelFormat::RGBAS3tcDxt3, {4, 4, 6},
              CompressedFullPixelStorageData[testCaseInstanceId()].data,
              BufferUsage::StaticDraw});
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CompressedBufferImage3D image = texture.compressedImage(0, {CompressedFullPixelStorageData[testCaseInstanceId()].storage}, BufferUsage::StaticRead);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      CORRADE_COMPARE(image.size(), (Vector3i{4, 4, 6}));
      const auto imageData = image.buffer().data();
      {
          CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::Mesa) && CompressedFullPixelStorageData[testCaseInstanceId()].storage != CompressedPixelStorage{},
              "Mesa drivers can't handle non-default pixel storage for full cubemap image queries.");
          CORRADE_COMPARE_AS(Containers::arrayCast<UnsignedByte>(imageData).suffix(CompressedFullPixelStorageData[testCaseInstanceId()].offset),
              CompressedFullPixelStorageData[testCaseInstanceId()].data,
              TestSuite::Compare::Container);
      }
  }
  #endif
  
  void CubeMapTextureGLTest::generateMipmap() {
      #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
      constexpr TextureFormat format = TextureFormat::RGBA8;
      #else
      constexpr TextureFormat format = TextureFormat::RGBA;
      #endif
  
      CubeMapTexture texture;
      texture.setImage(CubeMapCoordinate::PositiveX, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
      texture.setImage(CubeMapCoordinate::PositiveY, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
      texture.setImage(CubeMapCoordinate::PositiveZ, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
      texture.setImage(CubeMapCoordinate::NegativeX, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
      texture.setImage(CubeMapCoordinate::NegativeY, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
      texture.setImage(CubeMapCoordinate::NegativeZ, 0, format,
          ImageView2D(PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(32)));
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      CORRADE_COMPARE(texture.imageSize(0), Vector2i(32));
      CORRADE_COMPARE(texture.imageSize(1), Vector2i( 0));
      #endif
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      texture.generateMipmap();
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  
      /** @todo How to test this on ES? */
      #ifndef MAGNUM_TARGET_GLES
      CORRADE_COMPARE(texture.imageSize(0), Vector2i(32));
      CORRADE_COMPARE(texture.imageSize(1), Vector2i(16));
      CORRADE_COMPARE(texture.imageSize(2), Vector2i( 8));
      CORRADE_COMPARE(texture.imageSize(3), Vector2i( 4));
      CORRADE_COMPARE(texture.imageSize(4), Vector2i( 2));
      CORRADE_COMPARE(texture.imageSize(5), Vector2i( 1));
  
      MAGNUM_VERIFY_NO_GL_ERROR();
      #endif
  }
  
  void CubeMapTextureGLTest::invalidateImage() {
      CubeMapTexture texture;
      texture.setStorage(2,
          #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
          TextureFormat::RGBA8,
          #else
          TextureFormat::RGBA,
          #endif
          Vector2i(32));
      texture.invalidateImage(1);
  
      MAGNUM_VERIFY_NO_GL_ERROR();
  }
  
  void CubeMapTextureGLTest::invalidateSubImage() {
      CubeMapTexture texture;
      texture.setStorage(2,
          #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
          TextureFormat::RGBA8,
          #else
          TextureFormat::RGBA,
          #endif
          Vector2i(32));
      texture.invalidateSubImage(1, Vector3i(2), Vector3i(Vector2i(8), 4));
  
      {
          #ifndef MAGNUM_TARGET_GLES
          /* Mesa (last checked version 18.0.0) treats cube map images as having
             only single layer instead of 6, so the above invalidation call
             fails. Relevant source code (scroll up to see imageDepth = 1):
             https://github.com/mesa3d/mesa/blob/051fddb4a9e6abb6f2cf9c892e34c8739983c794/src/mesa/main/texobj.c#L2293 */
          CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::Mesa) && Context::current().isExtensionSupported<Extensions::ARB::invalidate_subdata>(),
              "Broken on Mesa.");
          #endif
  
          MAGNUM_VERIFY_NO_GL_ERROR();
      }
  }
  
  }}}}
  
  CORRADE_TEST_MAIN(Magnum::GL::Test::CubeMapTextureGLTest)
  