NVDEC implementation using FFmpeg (#443)

* Initial nvdec implementation using FFmpeg

* Fix swapped channels on the video decoder and the G8R8 texture format

* Fix texture samplers not being set properly (regression)

* Rebased

* Remove unused code introduced on the rebase

* Add support for RGBA8 output format on the video image composer

* Correct spacing

* Some fixes for rebase and other tweaks

* Allow size mismatch on frame copy

* Get rid of GetHostAddress calls on VDec

1 files changed, 117 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Graphics3d/Texture/TextureFactory.cs b/Ryujinx.Graphics/Graphics3d/Texture/TextureFactory.cs
new file mode 100644
index 00000000..1f2d625e
--- /dev/null
+++ b/Ryujinx.Graphics/Graphics3d/Texture/TextureFactory.cs
@@ -0,0 +1,117 @@
+using Ryujinx.Graphics.Gal;
+using Ryujinx.Graphics.Memory;
+using System;
+
+namespace Ryujinx.Graphics.Texture
+{
+    static class TextureFactory
+    {
+        public static GalImage MakeTexture(NvGpuVmm Vmm, long TicPosition)
+        {
+            int[] Tic = ReadWords(Vmm, TicPosition, 8);
+
+            GalImageFormat Format = GetImageFormat(Tic);
+
+            GalTextureSource XSource = (GalTextureSource)((Tic[0] >> 19) & 7);
+            GalTextureSource YSource = (GalTextureSource)((Tic[0] >> 22) & 7);
+            GalTextureSource ZSource = (GalTextureSource)((Tic[0] >> 25) & 7);
+            GalTextureSource WSource = (GalTextureSource)((Tic[0] >> 28) & 7);
+
+            TextureSwizzle Swizzle = (TextureSwizzle)((Tic[2] >> 21) & 7);
+
+            GalMemoryLayout Layout;
+
+            if (Swizzle == TextureSwizzle.BlockLinear ||
+                Swizzle == TextureSwizzle.BlockLinearColorKey)
+            {
+                Layout = GalMemoryLayout.BlockLinear;
+            }
+            else
+            {
+                Layout = GalMemoryLayout.Pitch;
+            }
+
+            int BlockHeightLog2 = (Tic[3] >> 3)  & 7;
+            int TileWidthLog2   = (Tic[3] >> 10) & 7;
+
+            int BlockHeight = 1 << BlockHeightLog2;
+            int TileWidth   = 1 << TileWidthLog2;
+
+            int Width  = (Tic[4] & 0xffff) + 1;
+            int Height = (Tic[5] & 0xffff) + 1;
+
+            GalImage Image = new GalImage(
+                Width,
+                Height,
+                TileWidth,
+                BlockHeight,
+                Layout,
+                Format,
+                XSource,
+                YSource,
+                ZSource,
+                WSource);
+
+            if (Layout == GalMemoryLayout.Pitch)
+            {
+                Image.Pitch = (Tic[3] & 0xffff) << 5;
+            }
+
+            return Image;
+        }
+
+        public static GalTextureSampler MakeSampler(NvGpu Gpu, NvGpuVmm Vmm, long TscPosition)
+        {
+            int[] Tsc = ReadWords(Vmm, TscPosition, 8);
+
+            GalTextureWrap AddressU = (GalTextureWrap)((Tsc[0] >> 0) & 7);
+            GalTextureWrap AddressV = (GalTextureWrap)((Tsc[0] >> 3) & 7);
+            GalTextureWrap AddressP = (GalTextureWrap)((Tsc[0] >> 6) & 7);
+
+            GalTextureFilter    MagFilter = (GalTextureFilter)   ((Tsc[1] >> 0) & 3);
+            GalTextureFilter    MinFilter = (GalTextureFilter)   ((Tsc[1] >> 4) & 3);
+            GalTextureMipFilter MipFilter = (GalTextureMipFilter)((Tsc[1] >> 6) & 3);
+
+            GalColorF BorderColor = new GalColorF(
+                BitConverter.Int32BitsToSingle(Tsc[4]),
+                BitConverter.Int32BitsToSingle(Tsc[5]),
+                BitConverter.Int32BitsToSingle(Tsc[6]),
+                BitConverter.Int32BitsToSingle(Tsc[7]));
+
+            return new GalTextureSampler(
+                AddressU,
+                AddressV,
+                AddressP,
+                MinFilter,
+                MagFilter,
+                MipFilter,
+                BorderColor);
+        }
+
+        private static GalImageFormat GetImageFormat(int[] Tic)
+        {
+            GalTextureType RType = (GalTextureType)((Tic[0] >> 7)  & 7);
+            GalTextureType GType = (GalTextureType)((Tic[0] >> 10) & 7);
+            GalTextureType BType = (GalTextureType)((Tic[0] >> 13) & 7);
+            GalTextureType AType = (GalTextureType)((Tic[0] >> 16) & 7);
+
+            GalTextureFormat Format = (GalTextureFormat)(Tic[0] & 0x7f);
+
+            bool ConvSrgb = ((Tic[4] >> 22) & 1) != 0;
+
+            return ImageUtils.ConvertTexture(Format, RType, GType, BType, AType, ConvSrgb);
+        }
+
+        private static int[] ReadWords(NvGpuVmm Vmm, long Position, int Count)
+        {
+            int[] Words = new int[Count];
+
+            for (int Index = 0; Index < Count; Index++, Position += 4)
+            {
+                Words[Index] = Vmm.ReadInt32(Position);
+            }
+
+            return Words;
+        }
+    }
+}
\ No newline at end of file