Initial work

Ryujinx.Graphics.OpenGL/Counters.cs

@@ -0,0 +1,77 @@
+using OpenTK.Graphics.OpenGL;
+using Ryujinx.Graphics.GAL;
+using System;
+
+namespace Ryujinx.Graphics.OpenGL
+{
+    class Counters
+    {
+        private int[] _queryObjects;
+
+        private ulong[] _accumulatedCounters;
+
+        public Counters()
+        {
+            int count = Enum.GetNames(typeof(CounterType)).Length;
+
+            _queryObjects = new int[count];
+
+            _accumulatedCounters = new ulong[count];
+        }
+
+        public void Initialize()
+        {
+            for (int index = 0; index < _queryObjects.Length; index++)
+            {
+                int handle = GL.GenQuery();
+
+                _queryObjects[index] = handle;
+
+                CounterType type = (CounterType)index;
+
+                GL.BeginQuery(GetTarget(type), handle);
+            }
+        }
+
+        public ulong GetCounter(CounterType type)
+        {
+            UpdateAccumulatedCounter(type);
+
+            return _accumulatedCounters[(int)type];
+        }
+
+        public void ResetCounter(CounterType type)
+        {
+            UpdateAccumulatedCounter(type);
+
+            _accumulatedCounters[(int)type] = 0;
+        }
+
+        private void UpdateAccumulatedCounter(CounterType type)
+        {
+            int handle = _queryObjects[(int)type];
+
+            QueryTarget target = GetTarget(type);
+
+            GL.EndQuery(target);
+
+            GL.GetQueryObject(handle, GetQueryObjectParam.QueryResult, out long result);
+
+            _accumulatedCounters[(int)type] += (ulong)result;
+
+            GL.BeginQuery(target, handle);
+        }
+
+        private static QueryTarget GetTarget(CounterType type)
+        {
+            switch (type)
+            {
+                case CounterType.SamplesPassed:                      return QueryTarget.SamplesPassed;
+                case CounterType.PrimitivesGenerated:                return QueryTarget.PrimitivesGenerated;
+                case CounterType.TransformFeedbackPrimitivesWritten: return QueryTarget.TransformFeedbackPrimitivesWritten;
+            }
+
+            return QueryTarget.SamplesPassed;
+        }
+    }
+}