Refactor shader GPU state and memory access (#1203)

* Refactor shader GPU state and memory access

* Fix NVDEC project build

* Address PR feedback and add missing XML comments

Ryujinx.Graphics.Gpu/Shader/ShaderBundle.cs

@@ -0,0 +1,46 @@
+using Ryujinx.Graphics.GAL;
+using System;
+
+namespace Ryujinx.Graphics.Gpu.Shader
+{
+    /// <summary>
+    /// Represents a program composed of one or more shader stages (for graphics shaders),
+    /// or a single shader (for compute shaders).
+    /// </summary>
+    class ShaderBundle : IDisposable
+    {
+        /// <summary>
+        /// Host shader program object.
+        /// </summary>
+        public IProgram HostProgram { get; }
+
+        /// <summary>
+        /// Compiled shader for each shader stage.
+        /// </summary>
+        public ShaderCodeHolder[] Shaders { get; }
+
+        /// <summary>
+        /// Creates a new instance of the shader bundle.
+        /// </summary>
+        /// <param name="hostProgram">Host program with all the shader stages</param>
+        /// <param name="shaders">Shaders</param>
+        public ShaderBundle(IProgram hostProgram, params ShaderCodeHolder[] shaders)
+        {
+            HostProgram = hostProgram;
+            Shaders = shaders;
+        }
+
+        /// <summary>
+        /// Dispose of the host shader resources.
+        /// </summary>
+        public void Dispose()
+        {
+            HostProgram.Dispose();
+
+            foreach (ShaderCodeHolder holder in Shaders)
+            {
+                holder?.HostShader.Dispose();
+            }
+        }
+    }
+}