1 files changed, 911 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs b/src/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs
new file mode 100644
index 00000000..e93ea0c0
--- /dev/null
+++ b/src/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs
@@ -0,0 +1,911 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Texture;
+using System;
+
+namespace Ryujinx.Graphics.Gpu.Image
+{
+    /// <summary>
+    /// Texture format compatibility checks.
+    /// </summary>
+    static class TextureCompatibility
+    {
+        private enum FormatClass
+        {
+            Unclassified,
+            Bc1Rgba,
+            Bc2,
+            Bc3,
+            Bc4,
+            Bc5,
+            Bc6,
+            Bc7,
+            Etc2Rgb,
+            Etc2Rgba,
+            Astc4x4,
+            Astc5x4,
+            Astc5x5,
+            Astc6x5,
+            Astc6x6,
+            Astc8x5,
+            Astc8x6,
+            Astc8x8,
+            Astc10x5,
+            Astc10x6,
+            Astc10x8,
+            Astc10x10,
+            Astc12x10,
+            Astc12x12
+        }
+
+        /// <summary>
+        /// Checks if a format is host incompatible.
+        /// </summary>
+        /// <remarks>
+        /// Host incompatible formats can't be used directly, the texture data needs to be converted
+        /// to a compatible format first.
+        /// </remarks>
+        /// <param name="info">Texture information</param>
+        /// <param name="caps">Host GPU capabilities</param>
+        /// <returns>True if the format is incompatible, false otherwise</returns>
+        public static bool IsFormatHostIncompatible(TextureInfo info, Capabilities caps)
+        {
+            Format originalFormat = info.FormatInfo.Format;
+            return ToHostCompatibleFormat(info, caps).Format != originalFormat;
+        }
+
+        /// <summary>
+        /// Converts a incompatible format to a host compatible format, or return the format directly
+        /// if it is already host compatible.
+        /// </summary>
+        /// <remarks>
+        /// This can be used to convert a incompatible compressed format to the decompressor
+        /// output format.
+        /// </remarks>
+        /// <param name="info">Texture information</param>
+        /// <param name="caps">Host GPU capabilities</param>
+        /// <returns>A host compatible format</returns>
+        public static FormatInfo ToHostCompatibleFormat(TextureInfo info, Capabilities caps)
+        {
+            // The host API does not support those compressed formats.
+            // We assume software decompression will be done for those textures,
+            // and so we adjust the format here to match the decompressor output.
+
+            if (!caps.SupportsAstcCompression)
+            {
+                if (info.FormatInfo.Format.IsAstcUnorm())
+                {
+                    return GraphicsConfig.EnableTextureRecompression
+                        ? new FormatInfo(Format.Bc7Unorm, 4, 4, 16, 4)
+                        : new FormatInfo(Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+                }
+                else if (info.FormatInfo.Format.IsAstcSrgb())
+                {
+                    return GraphicsConfig.EnableTextureRecompression
+                        ? new FormatInfo(Format.Bc7Srgb, 4, 4, 16, 4)
+                        : new FormatInfo(Format.R8G8B8A8Srgb, 1, 1, 4, 4);
+                }
+            }
+
+            if (!HostSupportsBcFormat(info.FormatInfo.Format, info.Target, caps))
+            {
+                switch (info.FormatInfo.Format)
+                {
+                    case Format.Bc1RgbaSrgb:
+                    case Format.Bc2Srgb:
+                    case Format.Bc3Srgb:
+                    case Format.Bc7Srgb:
+                        return new FormatInfo(Format.R8G8B8A8Srgb, 1, 1, 4, 4);
+                    case Format.Bc1RgbaUnorm:
+                    case Format.Bc2Unorm:
+                    case Format.Bc3Unorm:
+                    case Format.Bc7Unorm:
+                        return new FormatInfo(Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+                    case Format.Bc4Unorm:
+                        return new FormatInfo(Format.R8Unorm, 1, 1, 1, 1);
+                    case Format.Bc4Snorm:
+                        return new FormatInfo(Format.R8Snorm, 1, 1, 1, 1);
+                    case Format.Bc5Unorm:
+                        return new FormatInfo(Format.R8G8Unorm, 1, 1, 2, 2);
+                    case Format.Bc5Snorm:
+                        return new FormatInfo(Format.R8G8Snorm, 1, 1, 2, 2);
+                    case Format.Bc6HSfloat:
+                    case Format.Bc6HUfloat:
+                        return new FormatInfo(Format.R16G16B16A16Float, 1, 1, 8, 4);
+                }
+            }
+
+            if (!caps.SupportsEtc2Compression)
+            {
+                switch (info.FormatInfo.Format)
+                {
+                    case Format.Etc2RgbaSrgb:
+                    case Format.Etc2RgbPtaSrgb:
+                    case Format.Etc2RgbSrgb:
+                        return new FormatInfo(Format.R8G8B8A8Srgb, 1, 1, 4, 4);
+                    case Format.Etc2RgbaUnorm:
+                    case Format.Etc2RgbPtaUnorm:
+                    case Format.Etc2RgbUnorm:
+                        return new FormatInfo(Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+                }
+            }
+
+            if (!caps.SupportsR4G4Format && info.FormatInfo.Format == Format.R4G4Unorm)
+            {
+                if (caps.SupportsR4G4B4A4Format)
+                {
+                    return new FormatInfo(Format.R4G4B4A4Unorm, 1, 1, 2, 4);
+                }
+                else
+                {
+                    return new FormatInfo(Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+                }
+            }
+
+            if (info.FormatInfo.Format == Format.R4G4B4A4Unorm)
+            {
+                if (!caps.SupportsR4G4B4A4Format)
+                {
+                    return new FormatInfo(Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+                }
+            }
+            else if (!caps.Supports5BitComponentFormat && info.FormatInfo.Format.Is16BitPacked())
+            {
+                return new FormatInfo(info.FormatInfo.Format.IsBgr() ? Format.B8G8R8A8Unorm : Format.R8G8B8A8Unorm, 1, 1, 4, 4);
+            }
+
+            return info.FormatInfo;
+        }
+
+        /// <summary>
+        /// Checks if the host API supports a given texture compression format of the BC family.
+        /// </summary>
+        /// <param name="format">BC format to be checked</param>
+        /// <param name="target">Target usage of the texture</param>
+        /// <param name="caps">Host GPU Capabilities</param>
+        /// <returns>True if the texture host supports the format with the given target usage, false otherwise</returns>
+        public static bool HostSupportsBcFormat(Format format, Target target, Capabilities caps)
+        {
+            bool not3DOr3DCompressionSupported = target != Target.Texture3D || caps.Supports3DTextureCompression;
+
+            switch (format)
+            {
+                case Format.Bc1RgbaSrgb:
+                case Format.Bc1RgbaUnorm:
+                case Format.Bc2Srgb:
+                case Format.Bc2Unorm:
+                case Format.Bc3Srgb:
+                case Format.Bc3Unorm:
+                    return caps.SupportsBc123Compression && not3DOr3DCompressionSupported;
+                case Format.Bc4Unorm:
+                case Format.Bc4Snorm:
+                case Format.Bc5Unorm:
+                case Format.Bc5Snorm:
+                    return caps.SupportsBc45Compression && not3DOr3DCompressionSupported;
+                case Format.Bc6HSfloat:
+                case Format.Bc6HUfloat:
+                case Format.Bc7Srgb:
+                case Format.Bc7Unorm:
+                    return caps.SupportsBc67Compression && not3DOr3DCompressionSupported;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Determines whether a texture can flush its data back to guest memory.
+        /// </summary>
+        /// <param name="info">Texture information</param>
+        /// <param name="caps">Host GPU Capabilities</param>
+        /// <returns>True if the texture can flush, false otherwise</returns>
+        public static bool CanTextureFlush(TextureInfo info, Capabilities caps)
+        {
+            if (IsFormatHostIncompatible(info, caps))
+            {
+                return false; // Flushing this format is not supported, as it may have been converted to another host format.
+            }
+
+            if (info.Target == Target.Texture2DMultisample ||
+                info.Target == Target.Texture2DMultisampleArray)
+            {
+                return false; // Flushing multisample textures is not supported, the host does not allow getting their data.
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Checks if the texture format matches with the specified texture information.
+        /// </summary>
+        /// <param name="lhs">Texture information to compare</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <param name="forSampler">Indicates that the texture will be used for shader sampling</param>
+        /// <param name="forCopy">Indicates that the texture will be used as copy source or target</param>
+        /// <returns>A value indicating how well the formats match</returns>
+        public static TextureMatchQuality FormatMatches(TextureInfo lhs, TextureInfo rhs, bool forSampler, bool forCopy)
+        {
+            // D32F and R32F texture have the same representation internally,
+            // however the R32F format is used to sample from depth textures.
+            if (lhs.FormatInfo.Format == Format.D32Float && rhs.FormatInfo.Format == Format.R32Float && (forSampler || forCopy))
+            {
+                return TextureMatchQuality.FormatAlias;
+            }
+
+            if (forCopy)
+            {
+                // The 2D engine does not support depth-stencil formats, so it will instead
+                // use equivalent color formats. We must also consider them as compatible.
+                if (lhs.FormatInfo.Format == Format.S8Uint && rhs.FormatInfo.Format == Format.R8Unorm)
+                {
+                    return TextureMatchQuality.FormatAlias;
+                }
+
+                if (lhs.FormatInfo.Format == Format.D16Unorm && rhs.FormatInfo.Format == Format.R16Unorm)
+                {
+                    return TextureMatchQuality.FormatAlias;
+                }
+
+                if ((lhs.FormatInfo.Format == Format.D24UnormS8Uint ||
+                     lhs.FormatInfo.Format == Format.S8UintD24Unorm) && rhs.FormatInfo.Format == Format.B8G8R8A8Unorm)
+                {
+                    return TextureMatchQuality.FormatAlias;
+                }
+            }
+
+            return lhs.FormatInfo.Format == rhs.FormatInfo.Format ? TextureMatchQuality.Perfect : TextureMatchQuality.NoMatch;
+        }
+
+        /// <summary>
+        /// Checks if the texture layout specified matches with this texture layout.
+        /// The layout information is composed of the Stride for linear textures, or GOB block size
+        /// for block linear textures.
+        /// </summary>
+        /// <param name="lhs">Texture information to compare</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <returns>True if the layout matches, false otherwise</returns>
+        public static bool LayoutMatches(TextureInfo lhs, TextureInfo rhs)
+        {
+            if (lhs.IsLinear != rhs.IsLinear)
+            {
+                return false;
+            }
+
+            // For linear textures, gob block sizes are ignored.
+            // For block linear textures, the stride is ignored.
+            if (rhs.IsLinear)
+            {
+                return lhs.Stride == rhs.Stride;
+            }
+            else
+            {
+                return lhs.GobBlocksInY == rhs.GobBlocksInY &&
+                       lhs.GobBlocksInZ == rhs.GobBlocksInZ;
+            }
+        }
+
+        /// <summary>
+        /// Obtain the minimum compatibility level of two provided view compatibility results.
+        /// </summary>
+        /// <param name="first">The first compatibility level</param>
+        /// <param name="second">The second compatibility level</param>
+        /// <returns>The minimum compatibility level of two provided view compatibility results</returns>
+        public static TextureViewCompatibility PropagateViewCompatibility(TextureViewCompatibility first, TextureViewCompatibility second)
+        {
+            if (first == TextureViewCompatibility.Incompatible || second == TextureViewCompatibility.Incompatible)
+            {
+                return TextureViewCompatibility.Incompatible;
+            }
+            else if (first == TextureViewCompatibility.LayoutIncompatible || second == TextureViewCompatibility.LayoutIncompatible)
+            {
+                return TextureViewCompatibility.LayoutIncompatible;
+            }
+            else if (first == TextureViewCompatibility.CopyOnly || second == TextureViewCompatibility.CopyOnly)
+            {
+                return TextureViewCompatibility.CopyOnly;
+            }
+            else
+            {
+                return TextureViewCompatibility.Full;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the sizes of two texture levels are copy compatible.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param>
+        /// <param name="rhs">Texture information of the texture view to match against</param>
+        /// <param name="lhsLevel">Mipmap level of the texture view in relation to this texture</param>
+        /// <param name="rhsLevel">Mipmap level of the texture view in relation to the second texture</param>
+        /// <returns>True if both levels are view compatible</returns>
+        public static bool CopySizeMatches(TextureInfo lhs, TextureInfo rhs, int lhsLevel, int rhsLevel)
+        {
+            Size size = GetAlignedSize(lhs, lhsLevel);
+
+            Size otherSize = GetAlignedSize(rhs, rhsLevel);
+
+            if (size.Width == otherSize.Width && size.Height == otherSize.Height)
+            {
+                return true;
+            }
+            else if (lhs.IsLinear && rhs.IsLinear)
+            {
+                // Copy between linear textures with matching stride.
+                int stride = BitUtils.AlignUp(Math.Max(1, lhs.Stride >> lhsLevel), Constants.StrideAlignment);
+
+                return stride == rhs.Stride;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the sizes of two given textures are view compatible.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param>
+        /// <param name="rhs">Texture information of the texture view to match against</param>
+        /// <param name="exact">Indicates if the sizes must be exactly equal</param>
+        /// <param name="level">Mipmap level of the texture view in relation to this texture</param>
+        /// <returns>The view compatibility level of the view sizes</returns>
+        public static TextureViewCompatibility ViewSizeMatches(TextureInfo lhs, TextureInfo rhs, bool exact, int level)
+        {
+            Size lhsAlignedSize = GetAlignedSize(lhs, level);
+            Size rhsAlignedSize = GetAlignedSize(rhs);
+
+            Size lhsSize = GetSizeInBlocks(lhs, level);
+            Size rhsSize = GetSizeInBlocks(rhs);
+
+            bool alignedWidthMatches = lhsAlignedSize.Width == rhsAlignedSize.Width;
+
+            if (lhs.FormatInfo.BytesPerPixel != rhs.FormatInfo.BytesPerPixel && IsIncompatibleFormatAliasingAllowed(lhs.FormatInfo, rhs.FormatInfo))
+            {
+                alignedWidthMatches = lhsSize.Width * lhs.FormatInfo.BytesPerPixel == rhsSize.Width * rhs.FormatInfo.BytesPerPixel;
+            }
+
+            TextureViewCompatibility result = TextureViewCompatibility.Full;
+
+            // For copies, we can copy a subset of the 3D texture slices,
+            // so the depth may be different in this case.
+            if (rhs.Target == Target.Texture3D && lhsSize.Depth != rhsSize.Depth)
+            {
+                result = TextureViewCompatibility.CopyOnly;
+            }
+
+            // Some APIs align the width for copy and render target textures,
+            // so the width may not match in this case for different uses of the same texture.
+            // To account for this, we compare the aligned width here.
+            // We expect height to always match exactly, if the texture is the same.
+            if (alignedWidthMatches && lhsSize.Height == rhsSize.Height)
+            {
+                return (exact && lhsSize.Width != rhsSize.Width) || lhsSize.Width < rhsSize.Width
+                    ? TextureViewCompatibility.CopyOnly
+                    : result;
+            }
+            else if (lhs.IsLinear && rhs.IsLinear && lhsSize.Height == rhsSize.Height)
+            {
+                // Copy between linear textures with matching stride.
+                int stride = BitUtils.AlignUp(Math.Max(1, lhs.Stride >> level), Constants.StrideAlignment);
+
+                return stride == rhs.Stride ? TextureViewCompatibility.CopyOnly : TextureViewCompatibility.LayoutIncompatible;
+            }
+            else
+            {
+                return TextureViewCompatibility.LayoutIncompatible;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the potential child texture fits within the level and layer bounds of the parent.
+        /// </summary>
+        /// <param name="parent">Texture information for the parent</param>
+        /// <param name="child">Texture information for the child</param>
+        /// <param name="layer">Base layer of the child texture</param>
+        /// <param name="level">Base level of the child texture</param>
+        /// <returns>Full compatiblity if the child's layer and level count fit within the parent, incompatible otherwise</returns>
+        public static TextureViewCompatibility ViewSubImagesInBounds(TextureInfo parent, TextureInfo child, int layer, int level)
+        {
+            if (level + child.Levels <= parent.Levels &&
+                layer + child.GetSlices() <= parent.GetSlices())
+            {
+                return TextureViewCompatibility.Full;
+            }
+            else
+            {
+                return TextureViewCompatibility.LayoutIncompatible;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the texture sizes of the supplied texture informations match.
+        /// </summary>
+        /// <param name="lhs">Texture information to compare</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <param name="exact">Indicates if the size must be exactly equal between the textures, or if <paramref name="rhs"/> is allowed to be larger</param>
+        /// <returns>True if the sizes matches, false otherwise</returns>
+        public static bool SizeMatches(TextureInfo lhs, TextureInfo rhs, bool exact)
+        {
+            if (lhs.GetLayers() != rhs.GetLayers())
+            {
+                return false;
+            }
+
+            Size lhsSize = GetSizeInBlocks(lhs);
+            Size rhsSize = GetSizeInBlocks(rhs);
+
+            if (exact || lhs.IsLinear || rhs.IsLinear)
+            {
+                return lhsSize.Width == rhsSize.Width &&
+                       lhsSize.Height == rhsSize.Height &&
+                       lhsSize.Depth == rhsSize.Depth;
+            }
+            else
+            {
+                Size lhsAlignedSize = GetAlignedSize(lhs);
+                Size rhsAlignedSize = GetAlignedSize(rhs);
+
+                return lhsAlignedSize.Width == rhsAlignedSize.Width &&
+                       lhsSize.Width >= rhsSize.Width &&
+                       lhsSize.Height == rhsSize.Height &&
+                       lhsSize.Depth == rhsSize.Depth;
+            }
+        }
+
+        /// <summary>
+        /// Gets the aligned sizes for the given dimensions, using the specified texture information.
+        /// The alignment depends on the texture layout and format bytes per pixel.
+        /// </summary>
+        /// <param name="info">Texture information to calculate the aligned size from</param>
+        /// <param name="width">The width to be aligned</param>
+        /// <param name="height">The height to be aligned</param>
+        /// <param name="depth">The depth to be aligned</param>
+        /// <returns>The aligned texture size</returns>
+        private static Size GetAlignedSize(TextureInfo info, int width, int height, int depth)
+        {
+            if (info.IsLinear)
+            {
+                return SizeCalculator.GetLinearAlignedSize(
+                    width,
+                    height,
+                    info.FormatInfo.BlockWidth,
+                    info.FormatInfo.BlockHeight,
+                    info.FormatInfo.BytesPerPixel);
+            }
+            else
+            {
+                return SizeCalculator.GetBlockLinearAlignedSize(
+                    width,
+                    height,
+                    depth,
+                    info.FormatInfo.BlockWidth,
+                    info.FormatInfo.BlockHeight,
+                    info.FormatInfo.BytesPerPixel,
+                    info.GobBlocksInY,
+                    info.GobBlocksInZ,
+                    info.GobBlocksInTileX);
+            }
+        }
+
+        /// <summary>
+        /// Gets the aligned sizes of the specified texture information.
+        /// The alignment depends on the texture layout and format bytes per pixel.
+        /// </summary>
+        /// <param name="info">Texture information to calculate the aligned size from</param>
+        /// <param name="level">Mipmap level for texture views</param>
+        /// <returns>The aligned texture size</returns>
+        public static Size GetAlignedSize(TextureInfo info, int level = 0)
+        {
+            int width = Math.Max(1, info.Width >> level);
+            int height = Math.Max(1, info.Height >> level);
+            int depth = Math.Max(1, info.GetDepth() >> level);
+
+            return GetAlignedSize(info, width, height, depth);
+        }
+
+        /// <summary>
+        /// Gets the size in blocks for the given texture information.
+        /// For non-compressed formats, that's the same as the regular size.
+        /// </summary>
+        /// <param name="info">Texture information to calculate the aligned size from</param>
+        /// <param name="level">Mipmap level for texture views</param>
+        /// <returns>The texture size in blocks</returns>
+        public static Size GetSizeInBlocks(TextureInfo info, int level = 0)
+        {
+            int width = Math.Max(1, info.Width >> level);
+            int height = Math.Max(1, info.Height >> level);
+            int depth = Math.Max(1, info.GetDepth() >> level);
+
+            return new Size(
+                BitUtils.DivRoundUp(width, info.FormatInfo.BlockWidth),
+                BitUtils.DivRoundUp(height, info.FormatInfo.BlockHeight),
+                depth);
+        }
+
+        /// <summary>
+        /// Check if it's possible to create a view with the layout of the second texture information from the first.
+        /// The layout information is composed of the Stride for linear textures, or GOB block size
+        /// for block linear textures.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param>
+        /// <param name="rhs">Texture information of the texture view to compare against</param>
+        /// <param name="level">Start level of the texture view, in relation with the first texture</param>
+        /// <returns>True if the layout is compatible, false otherwise</returns>
+        public static bool ViewLayoutCompatible(TextureInfo lhs, TextureInfo rhs, int level)
+        {
+            if (lhs.IsLinear != rhs.IsLinear)
+            {
+                return false;
+            }
+
+            // For linear textures, gob block sizes are ignored.
+            // For block linear textures, the stride is ignored.
+            if (rhs.IsLinear)
+            {
+                int stride = Math.Max(1, lhs.Stride >> level);
+                stride = BitUtils.AlignUp(stride, Constants.StrideAlignment);
+
+                return stride == rhs.Stride;
+            }
+            else
+            {
+                int height = Math.Max(1, lhs.Height >> level);
+                int depth = Math.Max(1, lhs.GetDepth() >> level);
+
+                (int gobBlocksInY, int gobBlocksInZ) = SizeCalculator.GetMipGobBlockSizes(
+                    height,
+                    depth,
+                    lhs.FormatInfo.BlockHeight,
+                    lhs.GobBlocksInY,
+                    lhs.GobBlocksInZ);
+
+                return gobBlocksInY == rhs.GobBlocksInY &&
+                       gobBlocksInZ == rhs.GobBlocksInZ;
+            }
+        }
+
+        /// <summary>
+        /// Check if it's possible to create a view with the layout of the second texture information from the first.
+        /// The layout information is composed of the Stride for linear textures, or GOB block size
+        /// for block linear textures.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param>
+        /// <param name="rhs">Texture information of the texture view to compare against</param>
+        /// <param name="lhsLevel">Start level of the texture view, in relation with the first texture</param>
+        /// <param name="rhsLevel">Start level of the texture view, in relation with the second texture</param>
+        /// <returns>True if the layout is compatible, false otherwise</returns>
+        public static bool ViewLayoutCompatible(TextureInfo lhs, TextureInfo rhs, int lhsLevel, int rhsLevel)
+        {
+            if (lhs.IsLinear != rhs.IsLinear)
+            {
+                return false;
+            }
+
+            // For linear textures, gob block sizes are ignored.
+            // For block linear textures, the stride is ignored.
+            if (rhs.IsLinear)
+            {
+                int lhsStride = Math.Max(1, lhs.Stride >> lhsLevel);
+                lhsStride = BitUtils.AlignUp(lhsStride, Constants.StrideAlignment);
+
+                int rhsStride = Math.Max(1, rhs.Stride >> rhsLevel);
+                rhsStride = BitUtils.AlignUp(rhsStride, Constants.StrideAlignment);
+
+                return lhsStride == rhsStride;
+            }
+            else
+            {
+                int lhsHeight = Math.Max(1, lhs.Height >> lhsLevel);
+                int lhsDepth = Math.Max(1, lhs.GetDepth() >> lhsLevel);
+
+                (int lhsGobBlocksInY, int lhsGobBlocksInZ) = SizeCalculator.GetMipGobBlockSizes(
+                    lhsHeight,
+                    lhsDepth,
+                    lhs.FormatInfo.BlockHeight,
+                    lhs.GobBlocksInY,
+                    lhs.GobBlocksInZ);
+
+                int rhsHeight = Math.Max(1, rhs.Height >> rhsLevel);
+                int rhsDepth = Math.Max(1, rhs.GetDepth() >> rhsLevel);
+
+                (int rhsGobBlocksInY, int rhsGobBlocksInZ) = SizeCalculator.GetMipGobBlockSizes(
+                    rhsHeight,
+                    rhsDepth,
+                    rhs.FormatInfo.BlockHeight,
+                    rhs.GobBlocksInY,
+                    rhs.GobBlocksInZ);
+
+                return lhsGobBlocksInY == rhsGobBlocksInY &&
+                       lhsGobBlocksInZ == rhsGobBlocksInZ;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the view format of the first texture format is compatible with the format of the second.
+        /// In general, the formats are considered compatible if the bytes per pixel values are equal,
+        /// but there are more complex rules for some formats, like compressed or depth-stencil formats.
+        /// This follows the host API copy compatibility rules.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param>
+        /// <param name="rhs">Texture information of the texture view</param>
+        /// <param name="caps">Host GPU capabilities</param>
+        /// <returns>The view compatibility level of the texture formats</returns>
+        public static TextureViewCompatibility ViewFormatCompatible(TextureInfo lhs, TextureInfo rhs, Capabilities caps)
+        {
+            FormatInfo lhsFormat = lhs.FormatInfo;
+            FormatInfo rhsFormat = rhs.FormatInfo;
+
+            if (lhsFormat.Format.IsDepthOrStencil() || rhsFormat.Format.IsDepthOrStencil())
+            {
+                return lhsFormat.Format == rhsFormat.Format ? TextureViewCompatibility.Full : TextureViewCompatibility.Incompatible;
+            }
+
+            if (IsFormatHostIncompatible(lhs, caps) || IsFormatHostIncompatible(rhs, caps))
+            {
+                return lhsFormat.Format == rhsFormat.Format ? TextureViewCompatibility.Full : TextureViewCompatibility.Incompatible;
+            }
+
+            if (lhsFormat.IsCompressed && rhsFormat.IsCompressed)
+            {
+                FormatClass lhsClass = GetFormatClass(lhsFormat.Format);
+                FormatClass rhsClass = GetFormatClass(rhsFormat.Format);
+
+                return lhsClass == rhsClass ? TextureViewCompatibility.Full : TextureViewCompatibility.Incompatible;
+            }
+            else if (lhsFormat.BytesPerPixel == rhsFormat.BytesPerPixel)
+            {
+                return lhs.FormatInfo.IsCompressed == rhs.FormatInfo.IsCompressed
+                    ? TextureViewCompatibility.Full
+                    : TextureViewCompatibility.CopyOnly;
+            }
+            else if (IsIncompatibleFormatAliasingAllowed(lhsFormat, rhsFormat))
+            {
+                return TextureViewCompatibility.CopyOnly;
+            }
+
+            return TextureViewCompatibility.Incompatible;
+        }
+
+        /// <summary>
+        /// Checks if aliasing of two formats that would normally be considered incompatible be allowed,
+        /// using copy dependencies.
+        /// </summary>
+        /// <param name="lhsFormat">Format information of the first texture</param
+        /// <param name="rhsFormat">Format information of the second texture</param>
+        /// <returns>True if aliasing should be allowed, false otherwise</returns>
+        private static bool IsIncompatibleFormatAliasingAllowed(FormatInfo lhsFormat, FormatInfo rhsFormat)
+        {
+            // Some games will try to alias textures with incompatible foramts, with different BPP (bytes per pixel).
+            // We allow that in some cases as long Width * BPP is equal on both textures.
+            // This is very conservative right now as we want to avoid copies as much as possible,
+            // so we only consider the formats we have seen being aliased.
+
+            if (rhsFormat.BytesPerPixel < lhsFormat.BytesPerPixel)
+            {
+                (lhsFormat, rhsFormat) = (rhsFormat, lhsFormat);
+            }
+
+            return lhsFormat.Format == Format.R8Unorm && rhsFormat.Format == Format.R8G8B8A8Unorm;
+        }
+
+        /// <summary>
+        /// Check if the target of the first texture view information is compatible with the target of the second texture view information.
+        /// This follows the host API target compatibility rules.
+        /// </summary>
+        /// <param name="lhs">Texture information of the texture view</param
+        /// <param name="rhs">Texture information of the texture view</param>
+        /// <param name="caps">Host GPU capabilities</param>
+        /// <returns>True if the targets are compatible, false otherwise</returns>
+        public static TextureViewCompatibility ViewTargetCompatible(TextureInfo lhs, TextureInfo rhs, ref Capabilities caps)
+        {
+            bool result = false;
+            switch (lhs.Target)
+            {
+                case Target.Texture1D:
+                case Target.Texture1DArray:
+                    result = rhs.Target == Target.Texture1D ||
+                             rhs.Target == Target.Texture1DArray;
+                    break;
+
+                case Target.Texture2D:
+                    result = rhs.Target == Target.Texture2D ||
+                             rhs.Target == Target.Texture2DArray;
+                    break;
+
+                case Target.Texture2DArray:
+                    result = rhs.Target == Target.Texture2D ||
+                             rhs.Target == Target.Texture2DArray;
+
+                    if (rhs.Target == Target.Cubemap || rhs.Target == Target.CubemapArray)
+                    {
+                        return caps.SupportsCubemapView ? TextureViewCompatibility.Full : TextureViewCompatibility.CopyOnly;
+                    }
+                    break;
+                case Target.Cubemap:
+                case Target.CubemapArray:
+                    result = rhs.Target == Target.Cubemap ||
+                             rhs.Target == Target.CubemapArray;
+
+                    if (rhs.Target == Target.Texture2D || rhs.Target == Target.Texture2DArray)
+                    {
+                        return caps.SupportsCubemapView ? TextureViewCompatibility.Full : TextureViewCompatibility.CopyOnly;
+                    }
+                    break;
+                case Target.Texture2DMultisample:
+                case Target.Texture2DMultisampleArray:
+                    if (rhs.Target == Target.Texture2D || rhs.Target == Target.Texture2DArray)
+                    {
+                        return TextureViewCompatibility.CopyOnly;
+                    }
+
+                    result = rhs.Target == Target.Texture2DMultisample ||
+                             rhs.Target == Target.Texture2DMultisampleArray;
+                    break;
+
+                case Target.Texture3D:
+                    if (rhs.Target == Target.Texture2D)
+                    {
+                        return TextureViewCompatibility.CopyOnly;
+                    }
+
+                    result = rhs.Target == Target.Texture3D;
+                    break;
+            }
+
+            return result ? TextureViewCompatibility.Full : TextureViewCompatibility.Incompatible;
+        }
+
+        /// <summary>
+        /// Checks if a swizzle component in two textures functionally match, taking into account if the components are defined.
+        /// </summary>
+        /// <param name="lhs">Texture information to compare</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <param name="swizzleLhs">Swizzle component for the first texture</param>
+        /// <param name="swizzleRhs">Swizzle component for the second texture</param>
+        /// <param name="component">Component index, starting at 0 for red</param>
+        /// <returns>True if the swizzle components functionally match, false othersize</returns>
+        private static bool SwizzleComponentMatches(TextureInfo lhs, TextureInfo rhs, SwizzleComponent swizzleLhs, SwizzleComponent swizzleRhs, int component)
+        {
+            int lhsComponents = lhs.FormatInfo.Components;
+            int rhsComponents = rhs.FormatInfo.Components;
+
+            if (lhsComponents == 4 && rhsComponents == 4)
+            {
+                return swizzleLhs == swizzleRhs;
+            }
+
+            // Swizzles after the number of components a format defines are "undefined".
+            // We allow these to not be equal under certain circumstances.
+            // This can only happen when there are less than 4 components in a format.
+            // It tends to happen when float depth textures are sampled.
+
+            bool lhsDefined = (swizzleLhs - SwizzleComponent.Red) < lhsComponents;
+            bool rhsDefined = (swizzleRhs - SwizzleComponent.Red) < rhsComponents;
+
+            if (lhsDefined == rhsDefined)
+            {
+                // If both are undefined, return true. Otherwise just check if they're equal.
+                return lhsDefined ? swizzleLhs == swizzleRhs : true;
+            }
+            else
+            {
+                SwizzleComponent defined = lhsDefined ? swizzleLhs : swizzleRhs;
+                SwizzleComponent undefined = lhsDefined ? swizzleRhs : swizzleLhs;
+
+                // Undefined swizzle can be matched by a forced value (0, 1), exact equality, or expected value.
+                // For example, R___ matches R001, RGBA but not RBGA.
+                return defined == undefined || defined < SwizzleComponent.Red || defined == SwizzleComponent.Red + component;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the texture shader sampling parameters of two texture informations match.
+        /// </summary>
+        /// <param name="lhs">Texture information to compare</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <returns>True if the texture shader sampling parameters matches, false otherwise</returns>
+        public static bool SamplerParamsMatches(TextureInfo lhs, TextureInfo rhs)
+        {
+            return lhs.DepthStencilMode == rhs.DepthStencilMode &&
+                   SwizzleComponentMatches(lhs, rhs, lhs.SwizzleR, rhs.SwizzleR, 0) &&
+                   SwizzleComponentMatches(lhs, rhs, lhs.SwizzleG, rhs.SwizzleG, 1) &&
+                   SwizzleComponentMatches(lhs, rhs, lhs.SwizzleB, rhs.SwizzleB, 2) &&
+                   SwizzleComponentMatches(lhs, rhs, lhs.SwizzleA, rhs.SwizzleA, 3);
+        }
+
+        /// <summary>
+        /// Check if the texture target and samples count (for multisampled textures) matches.
+        /// </summary>
+        /// <param name="first">Texture information to compare with</param>
+        /// <param name="rhs">Texture information to compare with</param>
+        /// <returns>True if the texture target and samples count matches, false otherwise</returns>
+        public static bool TargetAndSamplesCompatible(TextureInfo lhs, TextureInfo rhs)
+        {
+            return lhs.Target == rhs.Target &&
+                   lhs.SamplesInX == rhs.SamplesInX &&
+                   lhs.SamplesInY == rhs.SamplesInY;
+        }
+
+        /// <summary>
+        /// Gets the texture format class, for compressed textures, or Unclassified otherwise.
+        /// </summary>
+        /// <param name="format">The format</param>
+        /// <returns>Format class</returns>
+        private static FormatClass GetFormatClass(Format format)
+        {
+            switch (format)
+            {
+                case Format.Bc1RgbaSrgb:
+                case Format.Bc1RgbaUnorm:
+                    return FormatClass.Bc1Rgba;
+                case Format.Bc2Srgb:
+                case Format.Bc2Unorm:
+                    return FormatClass.Bc2;
+                case Format.Bc3Srgb:
+                case Format.Bc3Unorm:
+                    return FormatClass.Bc3;
+                case Format.Bc4Snorm:
+                case Format.Bc4Unorm:
+                    return FormatClass.Bc4;
+                case Format.Bc5Snorm:
+                case Format.Bc5Unorm:
+                    return FormatClass.Bc5;
+                case Format.Bc6HSfloat:
+                case Format.Bc6HUfloat:
+                    return FormatClass.Bc6;
+                case Format.Bc7Srgb:
+                case Format.Bc7Unorm:
+                    return FormatClass.Bc7;
+                case Format.Etc2RgbSrgb:
+                case Format.Etc2RgbUnorm:
+                    return FormatClass.Etc2Rgb;
+                case Format.Etc2RgbaSrgb:
+                case Format.Etc2RgbaUnorm:
+                    return FormatClass.Etc2Rgba;
+                case Format.Astc4x4Srgb:
+                case Format.Astc4x4Unorm:
+                    return FormatClass.Astc4x4;
+                case Format.Astc5x4Srgb:
+                case Format.Astc5x4Unorm:
+                    return FormatClass.Astc5x4;
+                case Format.Astc5x5Srgb:
+                case Format.Astc5x5Unorm:
+                    return FormatClass.Astc5x5;
+                case Format.Astc6x5Srgb:
+                case Format.Astc6x5Unorm:
+                    return FormatClass.Astc6x5;
+                case Format.Astc6x6Srgb:
+                case Format.Astc6x6Unorm:
+                    return FormatClass.Astc6x6;
+                case Format.Astc8x5Srgb:
+                case Format.Astc8x5Unorm:
+                    return FormatClass.Astc8x5;
+                case Format.Astc8x6Srgb:
+                case Format.Astc8x6Unorm:
+                    return FormatClass.Astc8x6;
+                case Format.Astc8x8Srgb:
+                case Format.Astc8x8Unorm:
+                    return FormatClass.Astc8x8;
+                case Format.Astc10x5Srgb:
+                case Format.Astc10x5Unorm:
+                    return FormatClass.Astc10x5;
+                case Format.Astc10x6Srgb:
+                case Format.Astc10x6Unorm:
+                    return FormatClass.Astc10x6;
+                case Format.Astc10x8Srgb:
+                case Format.Astc10x8Unorm:
+                    return FormatClass.Astc10x8;
+                case Format.Astc10x10Srgb:
+                case Format.Astc10x10Unorm:
+                    return FormatClass.Astc10x10;
+                case Format.Astc12x10Srgb:
+                case Format.Astc12x10Unorm:
+                    return FormatClass.Astc12x10;
+                case Format.Astc12x12Srgb:
+                case Format.Astc12x12Unorm:
+                    return FormatClass.Astc12x12;
+            }
+
+            return FormatClass.Unclassified;
+        }
+    }
+}
+\ No newline at end of file