Salieri: shader cache (#1701)

Here come Salieri, my implementation of a disk shader cache!

"I'm sure you know why I named it that."
"It doesn't really mean anything."

This implementation collects shaders at runtime and cache them to be later compiled when starting a game.

Ryujinx.Graphics.Gpu/Shader/TextureDescriptorCapableGpuAccessor.cs

@@ -0,0 +1,104 @@
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Image;
+using Ryujinx.Graphics.Shader;
+
+namespace Ryujinx.Graphics.Gpu.Shader
+{
+    abstract class TextureDescriptorCapableGpuAccessor : IGpuAccessor
+    {
+        public abstract T MemoryRead<T>(ulong address) where T : unmanaged;
+
+        public abstract Image.TextureDescriptor GetTextureDescriptor(int handle);
+
+        /// <summary>
+        /// Queries texture format information, for shaders using image load or store.
+        /// </summary>
+        /// <remarks>
+        /// This only returns non-compressed color formats.
+        /// If the format of the texture is a compressed, depth or unsupported format, then a default value is returned.
+        /// </remarks>
+        /// <param name="handle">Texture handle</param>
+        /// <returns>Color format of the non-compressed texture</returns>
+        public TextureFormat QueryTextureFormat(int handle)
+        {
+            var descriptor = GetTextureDescriptor(handle);
+
+            if (!FormatTable.TryGetTextureFormat(descriptor.UnpackFormat(), descriptor.UnpackSrgb(), out FormatInfo formatInfo))
+            {
+                return TextureFormat.Unknown;
+            }
+
+            return formatInfo.Format switch
+            {
+                Format.R8Unorm           => TextureFormat.R8Unorm,
+                Format.R8Snorm           => TextureFormat.R8Snorm,
+                Format.R8Uint            => TextureFormat.R8Uint,
+                Format.R8Sint            => TextureFormat.R8Sint,
+                Format.R16Float          => TextureFormat.R16Float,
+                Format.R16Unorm          => TextureFormat.R16Unorm,
+                Format.R16Snorm          => TextureFormat.R16Snorm,
+                Format.R16Uint           => TextureFormat.R16Uint,
+                Format.R16Sint           => TextureFormat.R16Sint,
+                Format.R32Float          => TextureFormat.R32Float,
+                Format.R32Uint           => TextureFormat.R32Uint,
+                Format.R32Sint           => TextureFormat.R32Sint,
+                Format.R8G8Unorm         => TextureFormat.R8G8Unorm,
+                Format.R8G8Snorm         => TextureFormat.R8G8Snorm,
+                Format.R8G8Uint          => TextureFormat.R8G8Uint,
+                Format.R8G8Sint          => TextureFormat.R8G8Sint,
+                Format.R16G16Float       => TextureFormat.R16G16Float,
+                Format.R16G16Unorm       => TextureFormat.R16G16Unorm,
+                Format.R16G16Snorm       => TextureFormat.R16G16Snorm,
+                Format.R16G16Uint        => TextureFormat.R16G16Uint,
+                Format.R16G16Sint        => TextureFormat.R16G16Sint,
+                Format.R32G32Float       => TextureFormat.R32G32Float,
+                Format.R32G32Uint        => TextureFormat.R32G32Uint,
+                Format.R32G32Sint        => TextureFormat.R32G32Sint,
+                Format.R8G8B8A8Unorm     => TextureFormat.R8G8B8A8Unorm,
+                Format.R8G8B8A8Snorm     => TextureFormat.R8G8B8A8Snorm,
+                Format.R8G8B8A8Uint      => TextureFormat.R8G8B8A8Uint,
+                Format.R8G8B8A8Sint      => TextureFormat.R8G8B8A8Sint,
+                Format.R8G8B8A8Srgb      => TextureFormat.R8G8B8A8Unorm,
+                Format.R16G16B16A16Float => TextureFormat.R16G16B16A16Float,
+                Format.R16G16B16A16Unorm => TextureFormat.R16G16B16A16Unorm,
+                Format.R16G16B16A16Snorm => TextureFormat.R16G16B16A16Snorm,
+                Format.R16G16B16A16Uint  => TextureFormat.R16G16B16A16Uint,
+                Format.R16G16B16A16Sint  => TextureFormat.R16G16B16A16Sint,
+                Format.R32G32B32A32Float => TextureFormat.R32G32B32A32Float,
+                Format.R32G32B32A32Uint  => TextureFormat.R32G32B32A32Uint,
+                Format.R32G32B32A32Sint  => TextureFormat.R32G32B32A32Sint,
+                Format.R10G10B10A2Unorm  => TextureFormat.R10G10B10A2Unorm,
+                Format.R10G10B10A2Uint   => TextureFormat.R10G10B10A2Uint,
+                Format.R11G11B10Float    => TextureFormat.R11G11B10Float,
+                _                        => TextureFormat.Unknown
+            };
+        }
+
+        /// <summary>
+        /// Queries texture target information.
+        /// </summary>
+        /// <param name="handle">Texture handle</param>
+        /// <returns>True if the texture is a buffer texture, false otherwise</returns>
+        public bool QueryIsTextureBuffer(int handle)
+        {
+            return GetTextureDescriptor(handle).UnpackTextureTarget() == TextureTarget.TextureBuffer;
+        }
+
+        /// <summary>
+        /// Queries texture target information.
+        /// </summary>
+        /// <param name="handle">Texture handle</param>
+        /// <returns>True if the texture is a rectangle texture, false otherwise</returns>
+        public bool QueryIsTextureRectangle(int handle)
+        {
+            var descriptor = GetTextureDescriptor(handle);
+
+            TextureTarget target = descriptor.UnpackTextureTarget();
+
+            bool is2DTexture = target == TextureTarget.Texture2D ||
+                               target == TextureTarget.Texture2DRect;
+
+            return !descriptor.UnpackTextureCoordNormalized() && is2DTexture;
+        }
+    }
+}