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, 42 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Graphics3d/Texture/TextureHelper.cs b/Ryujinx.Graphics/Graphics3d/Texture/TextureHelper.cs
new file mode 100644
index 00000000..6ac91d8b
--- /dev/null
+++ b/Ryujinx.Graphics/Graphics3d/Texture/TextureHelper.cs
@@ -0,0 +1,42 @@
+using ChocolArm64.Memory;
+using Ryujinx.Graphics.Gal;
+using Ryujinx.Graphics.Memory;
+
+namespace Ryujinx.Graphics.Texture
+{
+    static class TextureHelper
+    {
+        public static ISwizzle GetSwizzle(GalImage Image)
+        {
+            int BlockWidth    = ImageUtils.GetBlockWidth   (Image.Format);
+            int BytesPerPixel = ImageUtils.GetBytesPerPixel(Image.Format);
+
+            int Width = (Image.Width + (BlockWidth - 1)) / BlockWidth;
+
+            if (Image.Layout == GalMemoryLayout.BlockLinear)
+            {
+                int AlignMask = Image.TileWidth * (64 / BytesPerPixel) - 1;
+
+                Width = (Width + AlignMask) & ~AlignMask;
+
+                return new BlockLinearSwizzle(Width, BytesPerPixel, Image.GobBlockHeight);
+            }
+            else
+            {
+                return new LinearSwizzle(Image.Pitch, BytesPerPixel);
+            }
+        }
+
+        public static (MemoryManager Memory, long Position) GetMemoryAndPosition(
+            IMemory Memory,
+            long    Position)
+        {
+            if (Memory is NvGpuVmm Vmm)
+            {
+                return (Vmm.Memory, Vmm.GetPhysicalAddress(Position));
+            }
+
+            return ((MemoryManager)Memory, Position);
+        }
+    }
+}