Low level graphics API prerequisites (#319)

* Add GalPipelineState and IGalPipeline

* Separate UploadVertex call

* Add ConstBuffer cache

* Move Vertex Assembly into GalPipelineState

* Move Uniform binds to GalPipelineState

* Move framebuffer flip into a buffer

* Rebase

* Fix regression

* Move clear values from VertexEndGl to ClearBuffers

* Rename obscure names O->Old S->New

Ryujinx.Graphics/Gal/OpenGL/OGLConstBuffer.cs

@@ -0,0 +1,66 @@
+using OpenTK.Graphics.OpenGL;
+using System;
+
+namespace Ryujinx.Graphics.Gal.OpenGL
+{
+    class OGLConstBuffer : IGalConstBuffer
+    {
+        private OGLCachedResource<OGLStreamBuffer> Cache;
+
+        public OGLConstBuffer()
+        {
+            Cache = new OGLCachedResource<OGLStreamBuffer>(DeleteBuffer);
+        }
+
+        public void LockCache()
+        {
+            Cache.Lock();
+        }
+
+        public void UnlockCache()
+        {
+            Cache.Unlock();
+        }
+
+        public void Create(long Key, long Size)
+        {
+            OGLStreamBuffer Buffer = new OGLStreamBuffer(BufferTarget.UniformBuffer, Size);
+
+            Cache.AddOrUpdate(Key, Buffer, Size);
+        }
+
+        public bool IsCached(long Key, long Size)
+        {
+            return Cache.TryGetSize(Key, out long CachedSize) && CachedSize == Size;
+        }
+
+        public void SetData(long Key, long Size, IntPtr HostAddress)
+        {
+            if (!Cache.TryGetValue(Key, out OGLStreamBuffer Buffer))
+            {
+                throw new InvalidOperationException();
+            }
+
+            Buffer.SetData(Size, HostAddress);
+        }
+
+        public bool TryGetUbo(long Key, out int UboHandle)
+        {
+            if (Cache.TryGetValue(Key, out OGLStreamBuffer Buffer))
+            {
+                UboHandle = Buffer.Handle;
+
+                return true;
+            }
+
+            UboHandle = 0;
+
+            return false;
+        }
+
+        private static void DeleteBuffer(OGLStreamBuffer Buffer)
+        {
+            Buffer.Dispose();
+        }
+    }
+}