Initial work

1 files changed, 95 insertions, 0 deletions

diff --git a/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs b/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs
new file mode 100644
index 00000000..52472164
--- /dev/null
+++ b/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs
@@ -0,0 +1,95 @@
+using Ryujinx.Graphics.GAL;
+
+namespace Ryujinx.Graphics.Gpu.Image
+{
+    static class TextureCompatibility
+    {
+        private enum FormatClass
+        {
+            Unclassified,
+            BCn64,
+            BCn128,
+            Bc1Rgb,
+            Bc1Rgba,
+            Bc2,
+            Bc3,
+            Bc4,
+            Bc5,
+            Bc6,
+            Bc7
+        }
+
+        public static bool FormatCompatible(FormatInfo lhs, FormatInfo rhs)
+        {
+            if (IsDsFormat(lhs.Format) || IsDsFormat(rhs.Format))
+            {
+                return lhs.Format == rhs.Format;
+            }
+
+            if (lhs.Format.IsAstc() || rhs.Format.IsAstc())
+            {
+                return lhs.Format == rhs.Format;
+            }
+
+            if (lhs.IsCompressed && rhs.IsCompressed)
+            {
+                FormatClass lhsClass = GetFormatClass(lhs.Format);
+                FormatClass rhsClass = GetFormatClass(rhs.Format);
+
+                return lhsClass == rhsClass;
+            }
+            else
+            {
+                return lhs.BytesPerPixel == rhs.BytesPerPixel;
+            }
+        }
+
+        private static FormatClass GetFormatClass(Format format)
+        {
+            switch (format)
+            {
+                case Format.Bc1RgbSrgb:
+                case Format.Bc1RgbUnorm:
+                    return FormatClass.Bc1Rgb;
+                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;
+            }
+
+            return FormatClass.Unclassified;
+        }
+
+        private static bool IsDsFormat(Format format)
+        {
+            switch (format)
+            {
+                case Format.D16Unorm:
+                case Format.D24X8Unorm:
+                case Format.D24UnormS8Uint:
+                case Format.D32Float:
+                case Format.D32FloatS8Uint:
+                    return true;
+            }
+
+            return false;
+        }
+    }
+}
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