Add A1B5G5R5 texture format. (#76)

* Update GalTextureFormat.cs

* Update TextureReader.cs

Ryujinx.Graphics/Gal/GalTextureFormat.cs

@@ -3,8 +3,9 @@ namespace Ryujinx.Graphics.Gal
     public enum GalTextureFormat
     {
         A8B8G8R8 = 0x8,
+        A1B5G5R5 = 0x14,
         BC1      = 0x24,
         BC2      = 0x25,
         BC3      = 0x26
     }
-}
+}

Ryujinx.Graphics/Gpu/TextureReader.cs

@@ -11,6 +11,7 @@ namespace Ryujinx.Graphics.Gpu
             switch (Texture.Format)
             {
                 case GalTextureFormat.A8B8G8R8: return Read4Bpp    (Memory, Texture);
+                case GalTextureFormat.A1B5G5R5: return Read2Bpp    (Memory, Texture);
                 case GalTextureFormat.BC1:      return Read8Bpt4x4 (Memory, Texture);
                 case GalTextureFormat.BC2:      return Read16Bpt4x4(Memory, Texture);
                 case GalTextureFormat.BC3:      return Read16Bpt4x4(Memory, Texture);
@@ -48,6 +49,35 @@ namespace Ryujinx.Graphics.Gpu
             return Output;
         }
 
+        private unsafe static byte[] Read2Bpp(AMemory Memory, Texture Texture)
+        {
+            int Width  = Texture.Width;
+            int Height = Texture.Height;
+
+            byte[] Output = new byte[Width * Height * 2];
+
+            ISwizzle Swizzle = GetSwizzle(Texture, 2);
+
+            fixed (byte* BuffPtr = Output)
+            {
+                long OutOffs = 0;
+
+                for (int Y = 0; Y < Height; Y++)
+                for (int X = 0; X < Width;  X++)
+                {
+                    long Offset = (uint)Swizzle.GetSwizzleOffset(X, Y);
+
+                    short Pixel = Memory.ReadInt16Unchecked(Texture.Position + Offset);
+
+                    *(short*)(BuffPtr + OutOffs) = Pixel;
+
+                    OutOffs += 2;
+                }
+            }
+
+            return Output;
+        }
+
         private unsafe static byte[] Read8Bpt4x4(AMemory Memory, Texture Texture)
         {
             int Width  = (Texture.Width  + 3) / 4;
@@ -124,4 +154,4 @@ namespace Ryujinx.Graphics.Gpu
             throw new NotImplementedException(Texture.Swizzle.ToString());
         }
     }
-}
+}